SMART ENCODER III MODEL EN 470. eeg enterprises, inc. 586 main street farmingdale, new york TEL: (516) FAX: (516)

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1 SMART ENCODER III MODEL EN 470 eeg enterprises, inc. 586 main street farmingdale, new york TEL: (516) FAX: (516)

2 Copyright (c) 1995, 1996,1997,1998,1999 Rev. 3.15A, September 1999 All rights reserved. TABLE OF CONTENTS Page 1 INTRODUCTION 1-1 THE CLOSED CAPTION SYSTEM 1-1 THE EN 470 SMART ENCODER III GETTING STARTED 2-1 MAKING CONNECTIONS 2-1 CONFIGURATION WHEN SHIPPED 2-2 EN 470 & EN 270 COMPARISONS 2-3 COMPATIBILITY WITH EN I/O BOARD PC94E2-2D 2-4 COFIGURATION OF SERIAL PORTS 2-4 DATA PORT PIN ASSIGNMENTS 2-5 ADAPTOR CABLE DATA COMMUNICATIONS 3-1 DATA TYPES 3-1 DATA PORTS 3-1 DATA PORT ASSIGNMENT 3-2 PERMISSIONS LIST 3-3 ACTIVE PORTS 3-3 RESET OPERATION EN470 SMART ENCODER OPERATION 4-1 REGENERATION MODE 4-2 TRANSPARENT MODE 4-2 CAPTION AND TEXT OPERATION 4-2 PASSTHRU MODE 4-2 REALTIME MODE 4-3 XDS MODE 4-4 DEFAULT PACKETS 4-4 STORED XDS PACKETS 4-5 ARTICLE MODE 4-6 DECODER OPERATION 4-6 XDS DISPLAY 4-7 VTR CONTROL PORT 4-7

3 5 EN470 COMMAND PROTOCOL 5-1 INTRODUCTION TO COMMAND DESCRIPTION 5-1 COMMAND DESCRIPTION 5-2 SETUP & MISCELLANEOUS COMMANDS 5-3 DECODER COMMAND 5-5 CAPTION OPERATION COMMANDS 5-6 XDS DATA & CONTROL COMMANDS 5-9 ARTICLE MODE COMMANDS 5-13 MONITOR COMMANDS 5-15 PORT COMMUNICATIONS & CONTROL COMMANDS 5-16 NVM CONTROL COMMANDS 5-18 VTR CONTROL PORT COMMANDS 5-19 SUMMARY OF COMMANDS 5-20

4 1 INTRODUCTION THE CLOSED CAPTIONING SYSTEM The CLOSED CAPTIONING SYSTEM provides for the transmission of CAPTION information and other TEXT and XDS material as an encoded composite data signal. The signal is inserted during the unblanked portion of Line 21 of the standard NTSC video signal or Line 22 of the standard PAL video signal. CAPTION and TEXT data may be encoded into either field or both but the data in each field is independent of each other. XDS data can only be encoded into Field 2. The composite data signal contained within the active portion of the encoded line consists of a 7 cycle sine-wave clock run-in burst, a start bit and 16 bits of data. The 16 data bits consist of two 7 bit ASCII characters with odd parity. The Closed Caption waveform is shown below. The clock rate is MHz which is 32xH. The clock burst and data packet are 50 IRE units peak-to-peak and are filtered to a "2T" response. CLOSED CAPTION WAVEFORM THE EN 470 SMART ENCODER III The EN 470 Smart Encoder III is a multi-standard encoder intended for inserting locally supplied Closed Caption System information into Line 21 of the incoming video signal, which may already have encoded data present. It recovers the incoming Line 21 code, determines whether Line 21 is already filled and either regenerates the recovered code or inserts locally supplied data. The information described in this manual will refer to Line 21 of the standard NTSC video signal. However, it should be understood that when the encoder is configured for PAL use the same encoder operation will be true except that the caption waveform will be encoded into Line 22 of the standard PAL video signal. All references to Line 21 should be interpreted to mean Line 22 in PAL.

5 The Smart Encoder III provides great flexibility for use in a multi-supplier environment. It is constructed as six logical encoders, each having the ability to encode locally supplied data into Line 21 of the output video. The encoder also has provision for six hardware ports, which can be used for data communications. Each logical encoder can be linked to one of the hardware data ports. At boot up time, each hardware port present is linked to a logical encoder and this link map is maintained in the non-volatile memory (NVM). Because of its multiplicity of logical encoders the Smart Encoder III can process data from several different data service suppliers at the same time. Data supplied through any of the ports that have Permission for a Data Channel can be encoded into that Data Channel at any time. It is the responsibility of the data suppliers to maintain an orderly encoding process. Only the RS 232C serial communications port designated as P3 can control certain configuration options of the EN 470. Therefore, P3 should be used for configuration of the encoder. Some of the many important and innovative features of the EN 470 are: Precise Line 21 waveform digitally synthesized. Multi-Standard video operation. By-pass protected for power failure. Digital Serial Component or Parallel Composite encoding optional. Simultaneous encoding in both fields. Automated XDS Encoding features. Quality video outputs for both encoder and decoder. No time base corrector needed in most applications. Three RS 232 / RS422 ports. Built in Modem with second modem optional. Built in VTR CONTROL port for VTR Remote Control. Built in two field Decoder with XDS display capability. Only one video adjustment (factory set). Display of EIA 608 Extended Characters. Non-volatile memory for retention of user parameters.

6 2 GETTING STARTED MAKING CONNECTIONS The configuration and operation of the EN 470 is controlled through the front panel switches and through the rear panel Data ports. The rear panel contains the jacks and ports used to interface the encoder to the outside world. All connections are made at the rear panel. The front panel LCD display shows the operating status of the encoder and decoder and displays menu information during setup. Rear Panel Connections The following steps describe the connections required to place the encoder into operation. It describes a setup where only one RS 232C port and a phone link is to be used. ENCODER REAR PANEL 1. Connect the line cord to a source of AC power. 2. Connect the Program Video source to the ENCODER IN jack. 3. Video output with locally inserted data in Line 21 will be available at the three ENCODER OUT jacks. Only ENCODER OUT 1 is by-pass protected. The other two jacks will have locally encoded Line 21 data even when the ENCODER ON button is in the OFF state. 4. The TTL Code and Key Pulse outputs provide signals for driving an external VBI inserting device. 5. Connect the source of data and control to port P1, P2 or P3. Refer to the Section on Data Communications for the setup and use of multiple data ports. 6. Connect the modem phone line to port MDM A. Phone connection to the encoder can be made even when the modem port is not active for data entry. The modem can connect at 1200 or 2400 baud. If the internal decoder is to be used continue the connections as follows. 7. Connect one of the ENCODER OUT jacks to the DECODER IN jack. 8. Decoded video appears at the two DECODER OUT jacks. Connect the DECODER OUT jack(s) to video monitor(s) as appropriate.

7 Front Panel Display & Switches The front panel contains a 2 row, 24 character LCD display which shows the status and menu selections. It also contains the switches needed to control its operation. FRONT PANEL The LCD display normally shows the operating mode and port assignment for each field. The I/O indicators show the current state of serial communications for Data, L21 and XDS. These indicators will blink when they are currently processing serial data. The status of the internal Decoder is shown in the upper right corner of the display. The data channel currently selected is shown. If an * is shown preceding the data channel it indicates that the decoder display is OFF. The ENCODER ON button provides manual control of the by-pass function. When ON the associated LED is lit and the video output jack, OUT 1 will have locally encoded data inserted into Line 21. The other three pushbuttons serve as manual entry for control of the internal decoder. Decoder ON and SELECT buttons are active and can be used to change the internal decoder's display mode. CONFIGURATION WHEN SHIPPED A brief description of some of the controllable features of the Smart Encoder III and how they were configured when shipped from the factory is helpful in getting started. The user should review the following sections to become familiar with their use and the methods for reporting and changing them. 1. All ports have Permission to enter data into all Data Channels. 2. Serial ports set for RS 232C, with 1200 baud, 7 data bits, odd parity operation. 3. The modem port is set for a maximum baud rate of 2400 baud. 4. The Field 2 interrupt processor is ON. 5. The NVM has no stored XDS packets. 6. MA is Active for CF1, P1 is Active for CF2 and P3 is Active for all other Data Types. 7. The encoder's Date and Time were set at the factory. The user should verify their accuracy when the equipment is installed.

8 EN 470 & EN 270 COMPARISONS The following table shows some of the differences between the EEG Smart Encoder III (Model EN470) and Smart Encoder II (Model EN 270). It should help previous users of the Smart Encoder to adjust to the change over to the EN 470. Feature EN 470 EN 270 Line 21 Encoding F1 & F2 Independently F1 Only Data Types CF1,CF2,TF1,TF2, XDS Data Channels CC1,CC2,CC3,CC4,T1, T2,T3,T4 & XDS C1,C2,T1 & T2 ^A6 & ^A7 Only controls the Data Controls all Data Channels for which the port is active. channels in F1 unless a qualifier is used in the command. Transparent Mode Settable on a field basis Not Settable Modem-Data Port Control by Command Switch Hardware Control in Data Port Connector COMPATIBILITY WITH EN 270 The EN 470 Smart Encoder III is designed to facilitate use by those systems currently using the EN 270 Smart Encoder II. It enables data service providers to communicate with either Smart Encoder without changing their internal command structure. EN 270 commands will be accepted for execution. Two examples are illustrated below. Example 1: To encode 3 row, Roll Up captions in CC1, enter: ^A2 CC1 3 <ENTER> or ^A2 C1 3 <ENTER> In either case the 3 can be omitted for 3 row roll. Thereafter, just enter the captions as ASCII text (no more than 32 characters per row) with carriage returns to indicate a new row. To exit the mode enter ^C. Example 2: To encode Field 1 data using the PassThru mode, enter: ^A3 F1 <ENTER> or ^A3 <ENTER> Thereafter, data input must follow the protocol for the data type being serviced.

9 As noted above, all ports having Permission for a particular Data Channel can assume Active status by simply entering an appropriate command for that Data Channel. When the new port takes over Active status, an end of mode (^C) is sent to the previously Active port, thus ending its mode of operation. XDS encoding is a special case. Several ports may have Permission for the XDS data Channel. However, a port can ONLY assume Active status through the ^AO command. I/O BOARD PC94E2-2D The I/O board provides the interface to the outside world. It has six modular jacks that connect to the 3 serial ports, the two modem ports and the VTR port. See Section 3 for additional information about the use of these ports. Configuration of Serial Ports The P1, P2 and P3 serial ports can be configured for RS 232C or RS 422 operation. The operating mode of each port is controlled by the jumper settings on a pair of selector headers located on the I/O board, PC94E2-2D. The jumper positions for RS 232 and RS 422 operation is shown in the two boxes on the right in the diagram below. The operation of each port is independent of the operation of any other port. Port P1 is controlled by selectors S1A and S1B. Port P2 is controlled by selectors S2A and S2B. Port P3 is controlled by selectors S3A and S3B. The positions in both the A and B headers must match.

10 Data Port Pin Assignments The rear panel modular connectors have 6 contacts each. The modular connector pin assignments are shown in the table below. Port P1 nc Gnd Tx Rx Gnd nc P2 nc Gnd Tx Rx Gnd nc P3 nc Gnd Tx Rx Gnd nc MA nc nc L2 L1 nc nc MB nc nc L2 L1 nc nc VTR** RX- Com TX- TX+ Com RX+ ** The VTR port communications is as follows. "1"(mark) (-) < (+) "0"(space) (-) > (+) Adaptor Cable An adaptor cable is provided which converts the modular jack to a DB9 female connector. The adaptor is marked 2X3 and is wired so that the P3 signals appear at the DB9 connector as follows. Function P3 DB9 Tx 3 2 Rx 4 3 Gnd 2,6 5

11 3 DATA COMMUNICATIONS The addition of Field 2 and XDS data services to Line 21 adds extended capabilities but also necessitates an extension of the encoder data processing capabilities. The EN 470 meets these extended needs by providing multiple Data Ports. This makes it possible for different data providers to encode independent line 21 services simultaneously. The following sections detail the concepts used in the Smart Encoder data communications. DATA TYPES The EN 470 processes locally supplied data which is combined with the data recovered from the incoming video signal and, under operator control, is used to generate the output video Line 21 data stream. The encoder can be configured so that several sources can be actively supplying different types of data for Line 21 insertion at the same time. The EN 470 groups Line 21 data types into field independent categories of Captions, Text and XDS. Table 1 below lists the different types of locally supplied data and the identifying mnemonic that is used in the command structure. In the encoder's command and control hierarchy any port can be made active for supplying any or all of the different Data Types. The following sections detail the procedure for data entry assignment. ID Data Type CF1 RealTime Captions or PassThru encoding into Field 1. CF2 RealTime Captions or PassThru encoding into Field 2. XDS Data for Field 2, XDS. TF1 Newswire encoding and TEXT data entry for Field 1. TF2 Newswire encoding and TEXT data entry for Field 2. CMD EN 470 control data TABLE 1 TYPES OF INPUT DATA DATA PORTS The EN 470 has provision for six hardware ports which can be used for data communications. Each hardware port is linked to one of the logical encoders at boot up time and this link map is maintained in the non-volatile memory (NVM). The Encoder Map can be read using the ^Ap command. It is unlikely that the map will need to be altered however, if a change in the link map is necessary it can only made by the supervisor port, P3.

12 The basic encoder has five of the six possible ports installed, three serial ports (P1, P2 and P3), one internal modem port (MA) and the VTR port. A second internal modem (MB) can be added as an option. Connection to these ports is through the six modular telephone type connectors on the rear panel. The ports are marked MDM A, 1, 2, 3, VTR and MDM B, where MDM A and MDM B refer to the internal modems MA and MB. The connectors marked 1, 2 and 3 refer to the three serial ports P1, P2, P3. The modem connectors are the two outside jacks in the array. Care should be taken to insure that the telco connections not be made to the serial communications jacks. The communications rate for all ports is reported by the ^AI command. Usually, serial communications for the three serial ports is maintained at 1200 baud with 7 data bits and odd parity. The front panel shows the port assignment and baud rate for the ports currently active for Field 1 and Field 2 data entry. The serial ports can be set to any baud rate between 1200 and baud, for 7 or 8 data bits and with any parity. Only port P3 can change the communications setup for any port. The internal modem(s) can operate at 1200 or 2400 baud. The baud rate established at setup by the ^AI command indicates the maximum baud rate allowed. This is the baud rate shown on the front panel display when the modem is active. The actual communications rate is established by the calling modem at connection time. However, if the maximum baud rate for the internal modem has been set to 1200 baud then 2400 baud communications will not function. The VTR port can be configured to operate in several modes using the ^An command. As shipped it is configured in the VTR mode which conforms to the protocol defined in ANSI/SMPTE 207M-1992 and in the Sony TM BVU-800 series VTRs. DATA PORT ASSIGNMENT The flexibility of the EN 470 provides the possibility for each data type being entered by any port. However, multiple ports simultaneously entering the same Data Type would be destructive and care must be exercised. Data communications is managed by two mapping assignment lists, the Permissions List and the Active list. The Permissions List controls which ports may be used to enter particular Data Types. However, having permission does not mean that the port can be used to enter data at the present time. Only when a port is Active can it be used to enter data for insertion into the output video. In all cases except XDS, any port with Permission can take Active status without executing the ^AO command. All ports can make status requests at any time but only the supervisor port, P3 can alter certain operating parameters.

13 Permissions List The EN 470 maintains a Permissions List which controls the ability for any port to enter data. All installed ports may communicate with the EN 470 but only those ports authorized in the Permissions List may supply data to be encoded into the output video. The Permissions List is read with the ^AQ command but only port P3 can write to the list. The list contains a "Y" or a "-" for each port and data type listing. A "Y" in any column position indicates that the particular port has permission to request access for that data type. A "-" means that data entry of that type will not be permitted. If a port requests Active status for a data type for which it does not have permission an error message (E1) will be returned. The default Permission List when shipped assigns a Y for all installed ports and all data types which enables all data type entry by any port. The response to the ^AQ command will appear as shown in Table 2. If a second modem is installed, the MB row will also have Y s present. Port Encoder CF1 CF2 XDS TF1 TF2 P3 En3 Y Y Y Y Y P1 En1 Y Y Y Y Y P2 En2 Y Y Y Y Y MA En4 Y Y Y Y Y MB En VTR En TABLE 2 PERMISSIONS LIST Active Ports The EN 470 maintains an Active List which shows the ports that currently have access for data entry. Only one port can be active for each data type at a time. Any port having Permission can enter data for any data type (Except XDS) at any time. When a valid mode setting command is entered, the Activity List will automatically be changed to make the requesting port active and the previously active port will be made inactive. However, only changes made through the ^AO command will be maintained in the Active List on a Reset or when a power cycle occurs.

14 The ^AO command is used to change or report the Active List status. This command must be used to become Active for XDS data service. A port can request a change in active status by including the data type parameters to the ^AO command. If the data type parameter is entered with a preceding minus sign it is a request to become inactive, otherwise it is a request to become active. For example, if P1 were active for entry of CF2 data then, P1 entering the command ^AO -CF2 <ENTER> will make P1 inactive for entering CF2 data. P3 would automatically become active for CF2 data entry. If the P3 port requests to become inactive there will be no port active for that data type. If there is no other port already active for a data type the requesting port does not need to enter the override parameter to become active. If there was another port active or permission has been denied in the Permission List, an error message will be returned. A port can take over active status (assuming permission was allowed) by entering the ^AO command with the override parameter included. For example, the entry ^AO CF1 O <ENTER> will make the port entering the command active for CF1 data entry and deactivate the port that had previously been active for CF1 entry. The parameters may be entered in any order. It is the requesting ports responsibility to be sure that the port being deactivated is finished with its data entry function. A port's active status can be read by entering the ^AO command without any other parameters. A typical response is shown in Table 3. The port entering the command will be listed first. Port Encoder CF1 CF2 XDS TF1 TF2 P3 En A A P1 En1 - - A - - P2 En2 - A MA En4 A MB En VTR TABLE 3 ACTIVE LIST The division of data entry through multiple ports brings about some changes in the operation of some of the commands used in previous Smart Encoders. The ^A6 and ^A7 commands are prime examples since they could previously be entered with an F1, F2 or All parameter. That is still true in the EN 470 but only if the port entering the command is active for both data types in the field; i.e. CF1 & TF1. If the port is active for only one of the data types, the command must be entered using the Data Channel designation such as ^A6 CC1 <ENTER> or an error message will be returned.

15 Summary of Port Usage Rules 1. Port P3 is the supervisor and is the only port that can change some operating conditions such as port baud rates, port resets and port permissions. 2. Only one port at a time can be active for entry of each data type. 3. Any port having permission may request active status. When a port becomes active it will deactivate a port that was previously active. 4. A modem port can establish phone connection without being Active for any Data Type. 5. When the modem port baud rate assignment is set to 2400 Baud the calling modem can use either 1200 or 2400 baud communications. If the modem port is set for 1200 baud, that is the only communications rate allowed. RESET OPERATION The EN 470 has three different reset mechanisms, hardware reset, software reset and a port reset. Their action is described in the following paragraphs. Hardware Reset The RESET button on the front panel will reset the entire encoder. This will clear all operations and the EN 470 will revert to the status maintained in the NVM. Software Reset The software reset command, ^F^F, can be executed by any port. Doing so will reset the logical encoder linked to that port. All other logical encoders will remain in their current operating state. For example, if P3 is currently encoding Field 1 data using PassThru mode and P2 is currently encoding Field 2 data in PassThru mode, then a ^F^F entered through P3 will reset Field 1 encoding mode to the Regeneration state but leave Field 2 encoding through PassThru via Port P2 still active. Port Reset The Port Reset command, ^Ar xx <ENTER>, can only be invoked by the super user port P3. This gives P3 the ability to reset any other port with the port to be reset being specified by the xx parameter. Its action is equivalent to the specified port executing the software reset ^F^F. In the case of the modem ports, when the command is invoked with the port identifier such as ^Ar MA <ENTER>, then the encoder linked to the modem will be reset and the modem will be hung up. If, on the other hand, this command is invoked using the logical encoder designation, such as ^Ar ENx <ENTER>, then the encoder will be reset but the modem will not be hung up.

16 4 EN 470 SMART ENCODER OPERATION The EN 470 is a multi-mode Line 21 encoder. It has several operating modes designed to facilitate the establishment of a complete line 21 service. Two modes are designed to maintain the quality of the line 21 signal. Two other modes provide non-stored Caption and Text encoding capability while the last two modes provide stored XDS and URL (Text) encoding capability. These modes are: Line 21 quality modes Regeneration Mode: Transparent Mode: Caption & Text Encoding PassThru Mode: RealTime Mode: XDS Encoding XDS Mode: Text Encoding Article Mode: Recovers and regenerates data present in line 21 of the incoming video signal. The line 21 signal present in the incoming video will be present in the output video without alteration or regeneration. Only data supplied through one of the encoder data ports will be inserted into line 21 of the output video. The data entered through the port must contain all appropriate line 21 codes. Data supplied through the encoder data port, for the data channel specified, will be encoded into the output video. The data entered through the data port should only be ASCII text. A Field 2 stored data mode that combines locally supplied XDS packet information with upstream XDS data. A Field 1 stored data mode that creates and manages a locally supplied Text service. The command protocol for this Encoder has been designed using a command protocol that is an extension of EEG's original Smart Encoder command protocol. The change to two field insertion requires additional parameters in the command line but every attempt has been made to make the default commands compatible with previous Smart Encoder commands. It should be understood that in the operations described in the following sections, these modes can be established for each field independently or for both fields simultaneously.

17 REGENERATION MODE This mode defines the basic operation of the EEG Smart Encoder. It is the mode that is invoked when the Smart Encoder is powered on. In this mode data is recovered from Line 21 of the incoming video and reinserted into Line 21 of the output video. As long as the incoming Line 21 signal has not deteriorated to a level which makes it unreadable, the output Line 21 signal will regenerate the signal accurately. Each field is processed independently so that the user may control the encoding operation on a field by field basis. TRANSPARENT MODE This mode of operation defines the state where the insert keyer is off. This means that the Line 21 signal that appears in the VIDEO OUT signal will be the same as the Line 21 signal present in the VIDEO IN signal. No Line 21 insertion will take place at any time. The encoder will not even insert Null Line into Line 21 of the output video. This mode is invoked on a field basis with the ^At Fx <ENTER> command and ended with the ^Au Fx <ENTER> command. Transparent Mode is not recommended for general use. It should only be used when previously encoded material is being processed to add Line 21 data to the other field and the inherent delay of the Regeneration Mode would be unacceptable. CAPTION AND TEXT OPERATION The Smart Encoder III treats Captioning and Text encoding separately. It defines the Data Types for Field 1 and Field 2 as CF1, CF2, TF1 and TF2. The encoding operations included under these four Data Types are PassThru and RealTime. PassThru can be used for encoding both captions and text however, the RealTime command must include the specific Data Channel parameter for Captions or Text PASSTHRU MODE PassThru is entered by the appropriate ^A3 Enter PassThru command. When operating in PassThru, the input video is processed by the EN 470 so that only user data, supplied through the active data port, will be inserted into Line 21 of the appropriate field. All line 21 data present in the incoming video signal will be removed. Captions or Text may be encoded as long as the port has Active status for that service. PassThru operation can be established for each field independently.

18 There are four options in PassThru mode. Their features are described in the command section. The F1 default mode is PassThru 4 which doubles the control code pairs. The F2 default mode is PassThru 2 which does not double the control code pairs. This conforms to the recommendations of EIA 608. The user may select different operation for each field. PassThru mode will insert Null Line when no other data is available for insertion. When this mode is ended by ^C, that field's operation will revert to REGENERATION MODE if no other data is available for output processing. For encoding of Captions or Text, the user selects the desired PassThru mode and then feeds the appropriate data. The EN 470 maintains a separate data buffer for each field and outputs the received bytes into the selected field as long as data is available in its buffer. While in PassThru mode, if the data buffer is empty, the encoder will insert Null Line or XDS data if enabled. Captions always have priority. The EN 470 receives data at a faster rate than its insertion into Line 21. Since insertion will continue as long as there is data available, it is possible to do simultaneous, two field encoding by alternately entering PassThru for each field as follows: ^A3 <ENTER> data.. data.. ^C ^A3 F2 <ENTER> data.. data.. ^C ^A3 <ENTER> In most cases, there is sufficient time to recover the time code each frame and perform simultaneous, two field encoding. If incoming captions are to be enabled by sending the ^A7 command after the ^C, the user should be aware of the possible delay in its taking effect since ^A7 will be responded to only after the buffer is empty. REALTIME MODE RealTime provides the capability of encoding either a Caption Rollup display or a Text display from an ASCII data source. The ASCII data entered will be processed into the Caption or Text data channels according to the parameter entered with the RealTime command. The caption display has a default base row of fifteen. In this operation data is stored until a line of text has been accumulated and then the line of text is transmitted in the data channel desired. This is a non-storing mode. The screen is not cleared when RealTime is entered or ended. If data is coming in at a faster rate than it is being transmitted the Field Queue will fill. This backs data up into the Input Buffer which signals XOFF when its limit is reached. XON will be sent when the port is ready to accept more data.

19 XDS MODE The EN 470 recovers Field 2 XDS data and merges it with XDS data supplied through a data port for insertion into the output video. This is a stored data mode where the recovered and locally entered packet data is held in memory and output into Field 2 according to the established protocol. XDS data sent to the encoder will be active as long as its transmission duration parameter is not zero or until it is erased due to a change in an associated packet. The XDS packets will be encoded into Line 21 Field 2, as space becomes available. They will be handled by the internal queue algorithm according to the priority value associated with the packet. Field 2 Captions will interrupt XDS insertion into the output video since they take precedence over any other field 2 data. The ^AP, Input XDS command is used to enter the packet data, which will then be stored in non-volatile memory or in the XDS buffers. The encoder can store up to 31 separate XDS packets. The user must supply the Class/Type byte pair, the Repeat Count, Priority and the packet data for each packet entered. The EN 470 will establish the correct Checksum for the packet. Locally supplied data takes precedence over recovered data of the same Class/Type. The EN 470 provides an optional Field 2 interrupt for XDS as recommended in the EIA draft advisory on Zenith compatibility. When this option is enabled the encoder will change the field 2 waveform for 1.3 seconds every 16 seconds. The changed waveform will have a 9 cycle clock burst but no start bit or data bits. To prevent any deleterious effect on Field 2 Captions and Text services this feature is programmed so that the pause will never occur less than 16 seconds after the Field 2 transmission of Caption or Text data. The user may permanently disable this feature entering the ^Aa off command. If sufficient room is not available for a complete packet, its transmission will be interrupted and resume with the Continue Packet identifier as many times as required. The EN 470 will maintain the identification of the active Data Channel just prior to insertion of the XDS data. If higher priority data resumes without a command that would enable the decoder to recognize the change from XDS data to non-xds data, the EN 470 will insert the proper "resume" command. Interleaving of packets is possible as different packets time out, but the encoder will only permit one level of interleave at a time. Default Packets Normally, locally created packets take priority over upstream packets of the same class/type. The implementation of the encoding of Program Rating packets during show production eliminates the need for a locally supplied rating packet. However, it is desirable to have a local Program Rating packet, which can be encoded only when the upstream program does not have one.

20 Default Packet mode operates with a locally loaded packet(s), which would be automatically encoded into the output video when no upstream packet of that type is present. The default packet is entered using the ^AP command, with the class/type designator having a leading L. For example; ^AP L PRI n When the upstream packet stops, the time-out built into the encoder will maintain the upstream packet transmission for 5 minutes. This insures continuity of program name and rating information through normal program interruptions such as commercial breaks, promos, etc. The transmission of the Default Packet will begin n seconds after the expiration of the time-out, where n is the last entry in the command string shown above. This is called the holdoff period. The examples below illustrate the transmission of Default Packets for the Program Rating and Program Name once every 3 seconds after a holdoff of 3 seconds. <ctrl-a>p L PRI 3 <ctrl-a>p L103-1 {program name} PRI 3 Stored XDS Packets The EN 470 has provision for storing some packets so that they will be transmitted continuously even after the encoder is power cycled or reset. The most likely candidates for storage are the two Channel Information Class packets, Network Name (0501) and Call Letters (0502) and the two Miscellaneous Class time related packets, Time Of Day (0701) and Time Zone (0704). These packets are stored in its non-volatile memory (NVM). The user need only enter the packet information into the NVM once. Thereafter, they will be sent without further action being required and will be maintained through a hardware reset or a power cycle. These packets are entered into NVM with the ^Aw command. The TOD and Time Zone packets will be made automatically from the encoder s time/date information and need only be entered as dummy values. For example, to store all 4 of the special handling XDS packets where Network = eeg and Call Letters = WEEG enter the following commands: ^Aw ^AP501-1 {eeg} <ENTER> ^Aw ^AP502-1 {WEEG} <ENTER> ^Aw ^AP <ENTER> ^Aw ^AP <ENTER> The NVM can be queried with the ^Ax command and stored packets removed with the ^Aw command.

21 ARTICLE MODE In Article Mode data is entered and stored as a complete message. The entire message can be repetitively transmitted in either field 1 text channel (T1 or T2) for as long as desired. It may be retained in memory indefinitely. The T1 and T2 text channels can be used for general text services. However, EIA 746-A has defined a text like service for Internet Uniform Resource Locators (URLs) that will be transmitted as T2 text. Therefore, it is strongly recommended that general text service transmissions be limited to the T1 channel if at all possible. The Smart Encoder can process as many as 24 different articles at one time as long as the total data storage required for those articles does not exceed the RAM storage available. During data entry typographical errors may be corrected before a carriage return is typed since the program recognizes editing codes such as backspace, delete line, and delete message. The messages may be transmitted in any sequence and repeated any number of times in either channel. However, the same message can not appear in both queues at the same time. The output queues may contain as many as 64 article names at one time between them. Once a text channel starts transmitting, any recovered text (from incoming line 21) is automatically deleted. This prevents the garbling of messages that would result if the two data streams were merged. When the output queue empties the recovered text channel will be reinstated unless it had been turned off by the Turn Off Line 21 command. DECODER OPERATION The EN 470 decoder is a two field decoder. It can decode and display information in Data Channels CC1 - CC4 and T1 - T4 that have been encoded according to the rules of EIA 608. In addition, it has two XDS display modes that have been designed for providing the TV viewer with information about the current program. The decoder also features a 16 second timer which can be used to clear the screen in Caption or XDS display modes. When enabled, the timer will clear the screen if no data in the channel being displayed is received for 16 seconds. When the operating display is being shown the Decoder ON and SELECT buttons are active and can be used to change the internal decoder's display mode.

22 XDS DISPLAY There are two XDS display modes designated Full and Graze. The XDS mode is the FULL information display (illustrated below). The Graze mode display is limited to the information in the top three rows without the Prog Type data. Only information actually transmitted will be displayed. Although XDS specifications define eight program description rows, the first four are identified as containing the most important information. We have limited the display of Program Description to the first four rows because eight rows would obscure much of the screen and because more than four rows is not likely to be sent due to the time required for transmission. Row 1,Grn Network Name Call Letters Row 2,Ital,Und Program Name (title) Row 4,Cyan Program Length Prog Type Time In Show Row 12,Yel Row 13,Yel Row 14,Yel Row 15,Yel Program Description Row 1 (if sent) Program Description Row 2 (if sent) Program Description Row 3 (if sent) Program Description Row 4 (if sent) VTR CONTROL PORT The EN 470 has an on board serial communications port, marked VTR CONTROL. It is intended to be used as the systems interface to the VTR's Remote Control port. It communicates at a 38.4KBaud rate using the Sony TM serial Protocol/Command sequence. The user can send machine control signals to the VTR through the EN 470. If time code operation is required, the user can instruct the EN 470 to read the VTR time code. Once Time Code Read is enabled, the encoder will recover the VTR time code through its VTR CONTROL port and send it to the user via the RS 232, each frame.

23 5 EN 470 COMMAND PROTOCOL INTRODUCTION TO COMMAND DESCRIPTION The EEG Smart Encoder III follows the command protocol established in the previous Models EN230 and EN270. They have used a series of commands to control the flow of Line 21 data. ANSI/EIA , Recommended Practice for Line 21 Data Service, (EIA 608), recommends that all new encoders continue to follow and expand this command structure. The FCC rules changes in 1993 extended the use of Line 21 format into Field 2 and defined additional data channels. EEG's modern encoders use the revised nomenclature defined for Line 21 Data Channel identification in EIA 608. The new designations are shown below along with the corresponding terminology used in earlier encoders. CC1 Captions, Lang 1, Field 1. T1 Text, Lang 1, Field 1. CC2 Captions, Lang 2, Field 1. T2 Text, Lang 2, Field 1. CC3 Captions, Lang 1, Field 2. T3 Text, Lang 1, Field 2. CC4 Captions, Lang 2, Field 2. T4 Text, Lang 2, Field 2. In the following commands, these Data Channels will be referred to as DC where appropriate. In most cases this designation will replace the "Language" and/or the "Channel" parameters in the command line used in the Smart Encoders. The new field 2 Data Channel, namely Extended Data Services (XDS) will always be referred to as XDS and never included within the DC reference. For those commands that control the entry of Data Types, CF1, CF2, XDS, TF1 and TF2, the command will show the Data Type identification parameter as ID. Commands are input to the Line 21 Encoder through one of the serial data ports. The encoder interacts with the controlling terminal and provides prompts as well as status and error messages. Commands are all two byte commands starting with the Hex byte 01h, generally entered by typing the A key while holding the Ctrl key. In the text this will be shown as ^A. A command line starts with the two bytes ^Ax, where x identifies the particular command. A list of these commands is shown at the end of this section. This is followed by the necessary command parameters and ends with a carriage return <ENTER>. The software Reset command, ^F^F, is the only exception to the ^Ax command structure. The prompt '*' followed by XON is output to the host whenever the Encoder is ready to accept a command.

24 Serial data received at the data port is processed in the 1024 byte Data Input Queue (DIQ). All serial data is first scanned for the software reset command, ^F^F, which must be received with odd parity. This command will be acted upon immediately, causing the logical encoder attached to that port to be cleared. All other bytes are transferred on according to the operating mode in effect. Flow control is maintained through an XON/XOFF protocol. XOFF is sent when the input queue becomes 3/4 full. XON will be sent when this queue drops to 1/4 full. COMMAND DESCRIPTION The following sections present the command protocol for the EN470 encoder. Wherever possible these commands are identical with those used in earlier EEG encoders. The Command line shows the mandatory entries in Bold and optional parameters nonbold. The Default line shows the parameter values that will be invoked if the optional parameter(s) are omitted. In general, configuration and control commands will report the current status if the command is entered without any optional parameters. For those commands which are associated with data port parameters the report will be the status of the port making the request. If the parameter "a" or "all" is added to those commands the report will be the status of all the ports.

25 SETUP & MISCELLANEOUS COMMANDS DATE ^Ad mm/dd/yy D <ENTER> Sets the encoder's internal clock to the day and date. Once entered this information is maintained in the NVM. The optional parameter must be entered as shown with the mm being the month, dd the date, yy the year. The D parameter is the day of the week with 1 representing Sunday. For example; ^Ad 02/07/95 3 <ENTER> would set the date to February 7, 1995 Tuesday. If the optional parameter is not used the command will report the current date in the form shown above. TIME OF DAY ^Ac hh:mm:ss timezone DST=On/Off <ENTER> Sets the encoder's internal clock to the current time of day and establishes the encoder's Time Zone location and Daylight Savings Time status. Once entered this information is maintained in the NVM. Thereafter, they need not be entered again unless there is a change (such as in DST status). The TOD parameter must be entered as the Local Time in the form shown, where hh is the hours in a 24 hour clock, mm is minutes and ss is seconds. Timezone is entered as the number representing the locations time zone relative to UTC ie; EST would be entered as the numeral 5. The DST status is entered as ON or OFF. The EN470 maintains UTC time for use in generating the correct time related XDS packet information. When the command ^Ac is entered without any optional parameters the unit will report the current local values as follows. Local time is 13:52:14, Time zone is 5, DST is OFF If the command is entered ^Ac UTC <ENTER>, the report will be: UTC is 18:52:14, Time zone is 5, DST is OFF FIELD 2 INTERRUPT ^Aa ON/OFF <ENTER> Enables or disables a 1.3 Second interrupt in Field 2 transmission approximately every 15 Seconds. The status is maintained in NVM. The command ^Aa will return the current setting.

26 SET VIDEO STANDARD Default: ^AU NTSC/PAL <ENTER> NTSC Sets the encoder operation for NTSC or PAL video. REPORT VERSION ^A? <ENTER> Returns the unit ID stored in PROM unless a ^As command has entered a new string. Returns: EEG Model EN470, Unit ID: 1403 Ver: 3.15A

27 DECODER COMMAND DECODER CONTROL Default: ^AM DC ON/OFF TON/TOFF <ENTER> CC1 ON TON This command is used to establish the Decoder operating mode. The Data Channel parameter (DC) should be selected from the following table and must be entered as shown in the left column or an E1 error message will be returned. The ON/OFF parameter controls the state of the decoder display. The TON/TOFF parameter controls the state of the 16 second erase timer. These parameters must be entered using the full word as shown (ON and TON) but can be in upper or lower case. Entering the command without any optional parameters will return the current decoder state. xxxx Decoder Function xxxx Decoder Function CC1 Display CC1 data ON Turn Decoder display on CC2 Display CC2 data OFF Turn Decoder display off CC3 Display CC3 data TON Enable 16 Second Timer CC4 Display CC4 data TOFF Disable 16 Second Timer T1 Display T1 data XDSG Display XDS Graze data T2 Display T2 data XDSF Display XDS Full data T3 Display T3 data T4 Display T4 data

28 CAPTION OPERATION COMMANDS ENTER RealTime ^A2 DC n Bn <ENTER> Default: CC1, 3 line rollup, base row 15 This command allows the user to insert ASCII data into Line 21 of the selected field using the Text or Caption Rollup display mode. The EN 470 supplies the required Closed Caption codes. The Front Panel display will show RTTXT or RTCAP in the field of the selected Data Channel. RealTime is ended by the End Of Mode (EOM) character, ^C. When it ends the encoder will restore the Data Channel RealTime was processing to the state it was in before RealTime was entered and return to REGENERATION Mode. The user supplied data must be in ASCII data format with a carriage return at the end of each line of data. There must not be any line feed (0Ah) following the carriage return if the data is to be inserted into Field 2. A line of data is transmitted upon the receipt of a carriage return, (cr). Data may be edited or deleted before the cr is input by use of Backspace (^H) which is a destructive backspace. The optional parameters are the Data Channel (DC), and if a caption data channel is selected, the number of rollup rows (n) and the base row (Bn). The DC can be any of the 8 possible Caption and Text channels. Rollup rows can be 2, 3 or 4. The base row can have a value between 1 (top) and 15 (bottom). If data is input faster than it can processed, the input queue may fill up. Therefore, when the queue becomes almost full, an XOFF character is output from the serial port. The sender must then suspend transmission of data until it receives an XON character indicating that the buffer is nearly empty, otherwise data will be lost. ENTER PassThru ^A3 n Fx <ENTER> Default: F1 = Mode 4, F2 = Mode 2 This command causes the entry into PassThru mode in the field identified by the Fx parameter. The operation of the possible modes are described below. The front panel display will show PTHRU in the field selected. PassThru is terminated by the End OF Mode (EOM) command, ^C. When PassThru ends the encoder will revert to REGENERATION Mode with the Data Channels of the selected field in the states they were in when the mode was entered.

29 In all four modes the parity bit is stripped off on the input and set to odd parity on output. Control-C (03h) and control-f (06h) are Smart Encoder control codes which are never transmitted. All incoming Line 21 channels are turned off upon entering this mode. The field data will have different degrees of processing depending on the optional parameter n. This parameter must be an integer between 1 and 4. The default for field 1 is 4 while the default for field 2 is 2. n=1 means all data is allowed and all data is passed. n=2 means legitimate Line 21 control codes are aligned and delayed so that the two-byte control pairs are transmitted in the same field. n=3 provides the same processing as n=2 with the addition that all Line 21 codes are doubled in field 1. No doubling is done in field 2 per EIA 608. n=4 Does the same processing as n=3 but is more restrictive on the input data. No non- Line 21 codes are transmitted and the character following a control-a is ignored. PassThru data created for field 1 insertion can be inserted into field 2 without the need to change the original data base. The EN470 will automatically convert the non-printing character of the appropriate Line 21 commands to make the field 2 data stream conform to the EIA 608 recommended practice. Conversion of field 2 type data for field 1 insertion is not performed. TURN OFF INSERT KEYER (Enter Transparent Mode) Default: ^At Fx <ENTER> F1 This command disables the insert keyer during the specified field so the Line 21 waveform in the output video will be identical to that of the input video. The front panel display will show TRANS in the field selected to indicate that the encoder is operating in TRANSPARENT MODE. The optional parameter, Fx, identifies the selected field. If this parameter is omitted the default will be Field 1.

30 TURN ON INSERT KEYER (End Transparent Mode) Default: ^Au Fx <ENTER> F1 This command is only required if TRANSPARENT MODE operation was set. It restores the insert keyer operation and reverts to REGENERATION Mode. The processing of incoming Line 21 data will be unchanged from what it was before TRANSPARENT MODE was entered. The optional parameter, Fx, identifies the selected field. If this parameter is omitted the default will be Field 1. TURN OFF INCOMING LINE 21 Default: ^A6 DC <ENTER> F1 This command deletes incoming Line 21 data in the specified field or in the specified Data Channels. If the command as input includes data channels for which the port is not active the command will not be executed and an error message will be returned. The status of unspecified Data Channels is unchanged. Incoming XDS data cannot be controlled with this command. The ^A6 and ^A7 commands can only be used for disabling or enabling the data channels for which the port is Active. For example; if a port is active for CF1 data entry but not TF1 data entry, then the command ^A6 f1 will return an error message while the command ^A6 cc1 cc2 will be acted upon.