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1 ZÄHLER STEUERGERÄTE DREHGEBER 2SHUDWLQJ,QVWUXFWLRQV,QWHUIDFH'HVFULSWLRQ 1(3URJ Content 1. General Transmission protocol Reading of storage locations Examples for the reading of storage locations Programming of storage locations Examples for the Programming of Storage Locations Special commands Clear counts Switching the counter to PGM Mode or to RUN Mode Readout of counter identification Readout of error message Clearing the error message Error messages during data transfer List of the control characters in use Operating plan Programming plan /2 P.O. Box 3360 D Villingen-Schwenningen Subject to technical as well as Fon +49 (0) Fax +49 (0) design errors and modifications info@ivo.de

2 1. General The serial interface can accomplish the same functions as the display and the keyboard of the counter. It is possible to call up data and to change the programming of parameters. In general, the counter is controlled via a PC. However, it is aso possible to use another device with similar features. 2. Transmission protocol The transmission is effected character by character in ASCII code. Each character consists of 8 bits. The 8 th bit is the parity bit, and in case of "no parity", the 8 th bit will always be sent as zero. The counter responds to every request of the PC via the serial interface if the data has been correctly transmitted. The transmission of characters is introduced with the start-of-text character <STX> and closed by the end-of-text character <ETX>. In addition, the counter sends a <CR> (carriage return) after <ETX>. This allows the input of a complete data block by means of one command (in high-level languages such as BASIC). After <STX> there will follow an address allotted to the counter, making it possible to specifically address the counter within a serial network. After the address, please indicate the position that you wish to read out or to program. In case of a programming command, you will need to enter a "P" (for programming) and the data (parameters). The protocol is classified into three groups as indicated below: a) Reading of the storage locations (READ-instruction): <STX> Address Line <ETX> [<CR>] b) Programming of storage locations (WRITE instruction): <STX> Address Line P Data <ETX> [<CR>] c) Special commands: <STX> Address Parameter <ETX> [<CR>] <STX> Start of text (02Hex) Address (device address) Line 01..XX (please refer to operating plan) P Programming command Data Programming data Parameter Special commands <ETX> End of text (03Hex) <CR> 0DHex (control character "carriage return") "CR" need not be indicated(optional), will however always be returned by counter. General <STX> Address Line <ETX> (Address=35; Line=02) Ascii <STX>3502<ETX> Hex 02H,33H,35H,30H,32H,03H 2

3 Important: The blanks between the particular characters of the commands only serve the purpose of better legibility. The input at the PC must be effected without blanks. Control characters (less than 20Hex) are set in "pointed" brackets. If a fase protocol has been sent by the PC, the counter will return an error message. This implies that it must still be possible to reach the. Please read the paragraph regarding error messages on page Reading of storage locations All storage locations that are indexed with a line number in the programming scheme can be read out (except the separating lines that are indexed by dashes). The protocol: <STX> Address Line <ETX> [<CR>] can be used for each line. The return answer of the counter may vary in the protocol length from one line to the other. This depends on the data length of the individual storage locations. The can aso be read out if operated in the RUN mode as well as in the PGM mode. The only difference is that the return answer of the counter will contain an "R" or a "P" in the mode parameter, as described in the following.. Answer to a Read instruction (general): <STX> Address Line Mode [VZ] Data <ETX> <CR> Mode VZ Data P= is in 3rogramming mode R= is in 5UN mode Plus/Minus sign, only indicated if value is negative Max. number of digits, with leading zeros w/o decimal point (Exception: Line 23 has a decimal point) 3.1. Examples for the reading of storage locations The following rule is valid for all subsequent examples: Counter address = 35; Counter mode = R (RUN-mode) 5HDGRXWRISULQFLSDOFRXQWHU;3/LQH &RXQW Request: <STX>3501<ETX> Answer: <STX>3501R001500<ETX><CR> 5HDGRXWRIW\SHRIFRXQWLQJ/LQH 6HWWLQJ 3RV Request: <STX>3525<ETX> Answer: <STX>3525R3<ETX><CR> (3 corresponds to track A90ºB single evaluation) 5HDGRXWRIVFDOLQJIDFWRU6)/LQH 6HWWLQJ Request: <STX>3523<ETX> Answer: <STX>3523R <ETX><CR> 5HDGRXWRIFRXQWHUDGGUHVV/LQH &RXQWHUDGGUHVV Request: <STX>3554<ETX> Answer: <STX>3554R35<ETX><CR> 4. Programming of storage locations All storage locations that are indexed with a line number in the programming plan may be programmed, except for the separating lines (that are indexed by dashes) and the lines 1, 5, and 6. The protocol: <STX> Address Line P [VZ] Data <ETX> [<CR>] can be used for each line. The answer of the counter that is returned after every programming step is the same as for the readout of the line. All storage locations may be programmed during the RUN-mode as well as the programming mode. 3

4 Programming in RUN-Mode: The data in lines 22,23,25-29,31,41/3,51-54 and will only be accepted internally after switching from PGM-mode to RUN-mode. For switching to PGM-Mode, please refer to 5.2. The other lines are immediately active after programming. All data programmed in the RUN-Mode will only be accepted in the permanent memory after switching from PGM-mode to RUN-mode. If there is no PGM/RUN switching, then the old data will remain valid after a power failure. Note: Those max. number of memory cycles of the non volatile memory amounts to Write-command (general): <STX> Address Line P [VZ] Data <ETX> [<CR>] 4.1. Examples for the programming of storage locations The following rule is valid for all subsequent examples: Counter address = 35; Counter mode = R (RUN-Mode) 3URJUDPPLQJRIVWDUWFRXQW6&/LQH 6WDUWFRXQW Command: <STX>3504P000360<ETX> Answer: <STX>3504R000360<ETX><CR> 3URJUDPPLQJRIVFDOLQJIDFWRU6)/LQH 6HWWLQJ Command: <STX>3523P <ETX> Answer: <STX>3523R <ETX><CR> 3URJUDPPLQJRIW\SHRIFRXQWLQJ/LQH 7\SHRIFRXQWLQJ Command: <STX>3525P1<ETX> Answer: <STX>3525R1<ETX><CR> 3URJUDPPLQJRIFRXQWHUDGGUHVV/LQH &RXQWHUDGGUHVV Command: <STX>3554P27<ETX> Answer: <STX>3554R27<ETX><CR> &OHDULQJRIVWDUWFRXQW6&/LQH Command: <STX>3504P000000<ETX> Answer: <STX>3504R000000<ETX><CR> 5. Special commands In the case of special commands, we are talking about instructions that do not refer to any line number (storage location on operator plan), with the exception of the command "Clear count" Clear counts The count XP (Line 1) can be cleared via the following special command. This is a line that cannot be programmed. All other lines on the programming plan (except the separating line) are cleared by programming the value ZERO (as described under item 4). The instruction to clear corresponds to a reset via the C key. The response (answer) of the counter when clearing is the same as with the reading of the corresponding line. General: <STX> Address Line <DEL> <ETX> Clearing of count XP $GGUHVV /LQH 6WDWXV 5810RGH Command: <STX>3501<DEL><ETX> Answer: <STX>3501R000000<ETX><CR> <DEL> = 7FHex 4

5 5.2. Switching the counter to PGM Mode or to RUN Mode This command allows you to switch the counter upon every call between the PGM mode and the RUN mode. The current line, as with the reading command on this line, will be returned as an answer. General: <STX> Address <DC1> <ETX> $GGUHVV 6WDWXV 5810RGH&XUUHQW/LQH &RXQW Command: <STX>35<DC1><ETX> <DC1> = 11Hex Answer: <STX>35P<ETX><CR> Repeating the command switches back to the RUN mode Command: <STX>35<DC1><ETX> Answer: <STX>35R<ETX><CR> 5.3. Readout of counter identification It is only possible to read the identification data. Two parameters follow the address: the command parameter "I" (for identification) and the selection parameter "T" (Type and program number) or "D" (date and hardware version) for the different identification data. Type of counter and Readout of program number: $GGUHVV 7\SH 1(3URJUDPQXPEHU Command: <STX>35IT<ETX> Answer: <STX>35 01<ETX><CR> Readout of date and version number: $GGUHVV 'DWH 9HUVLRQQXPEHU Command: <STX>35ID<ETX> Answer: <STX> <ETX><CR> 5.4. Readout of error message If an error message occurs during operation of the ("Error" and a digit are displayed), the mode byte (usually "R" or "P") will be indexed by the ASCII character "E", thus signalizing to the PC that an error has occurred at the counter. Functions only in case of error message "Err 07". All other errors are fatal errors, impeding any interface function. The error number itself can now be read out via the special command "E". General: <STX> Address E <ETX> $GGUHVV 6WDWXV (UURU0RGH(UURU Command: <STX>35E<ETX> Answer: <STX>35E7<ETX><CR> 5.5. Clearing the error message This command allows to clear error messages appearing on the display. It is only possible to clear the error messages that can be cleared via the C key on the device itself (e.g.: not Error 1 or 2). The contents of the current line will be returned as an answer. $GGUHVV 6WDWXV (UURU0RGH(UURU /LQH &RXQW Command: <STX>35<ACK><ETX> <ACK> = 06H Answer: <STX>3501R002500<ETX><CR> Attention: If the counter is on a line not containing any data, (e.g. line 10), an error message "<CAN><NUL>" will be returned. 5

6 6. Error messages during data transfer If the PC sends a wrong data protocol to the (e.g.: line that does not exist or letter instead of digit), then the counter will return a corresponding error message to the counter. In order to still receive an error message after an error, the control character <STX> and the address must at least be correct. If this is not the case, the can no longer be reached and will thus not be able to respond to the PC. If the PC does not receive a response after a request has been sent, i.e. not even an error message, then a fatal error has occurred. This may be the case if the control character <STX> or the address are missing and if the interface parameter of PC and are not congruent. Should these be correct, however, then it can only be a matter of a failure of the hardware or of the data line. General structure of the error messages: <STX> Address Line Status <CAN> Error number <ETX> <CR> $GGUHVV /LQH QRQYDOLGOLQH(UURUQXPEHU <STX>3509R&$1!<ETX><CR> In case of an error response, the two positions "Line" and "Status" will be left out. Error description in particular: Error 1 : Format error (<ETX> not in correct position). This error may occur for example if the data format has not been observed when programming (e.g.: when programming the Start Count, only 5 digits instead of 6 are transmitted). Error 2 : Line (position) not available or separating line Error 3 : Parameter error (non-admissible value in protocol). This means, for example, that the scaling factor does not only consist of digits, but also of other non-admissible characters, or that a value has been indicated that is not within an admissible range. 7. List of the control characters in use Control character Hex Decimal <STX> <ETX> <ACK> <LF> 0A 10 <CR> 0D 13 <DC1> <CAN> <DEL> 7F 127 6

7 8. Operating plan Line Factory Setting Customer program Short description 01 0 XP Count Principal counter P1 - Preselection P2 - Preselection SC - Start count 05 0 Σ - Totalizer Operating time meter Separating line 11 S t a t 0 S t a t XP - Count Principal counter 12 S t a t 0 S t a t P1 - Preselection 1 13 S t a t 0 S t a t P2 - Preselection 2 14 S t a t 0 S t a t SC - Start count 15 S t a t 0 S t a t Σ - Count Principal counter 16 S t a t 0 S t a t - Count Principal counter Separating line Operating modes S F 2 3 Scaling factor Decimal point Type of counting Frequency Principal counter Track A Frequency Principal counter Track B Input logic Reset Principal counter Function Signal input Output logic for digital output t Impulse signal time P t Impulse signal time P Take-over of preselections P1,P Preselection recognition Address of function key C o d 4 0 Code Function of batch counter Multiplier of batch counter Baud rate Parity Stop bits Address Assignment Analog output Offset for analog output Assignment of lower analog value u A 6 4 Lower analog value Assignment of upper analog value o A 6 6 Upper analog value Separating line 7

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