Magnitude TM Chiller Unit Controller BACnet Communication Module (MS/TP, IP, Ethernet)

Transcription

1 Installation and Maintenance Manual IM 963 Group: Controls Part Number: IM 963 Date: April 2010 Supercedes: New Magnitude TM Chiller Unit Controller BACnet Communication Module (MS/TP, IP, Ethernet) Daikin McQuay Magnitude Frictionless Centrifugal Chiller, Single-Compressor Model WME NOTICE Use this manual to physically install the McQuay BACnet Communication Module into the Daikin McQuay Magnitude Chiller unit controller and connect the unit controller to your network. Use the appropriate McQuay Engineering Data (ED), known as the Protocol Information document, to integrate the unit into your network. The Protocol Information document contains addressing details, BACnet protocol information, and a list of the data points available to the network. See the Reference Documents section of this manual for Protocol Information document numbers. Magnitude Chiller control integration literature is available from your local McQuay International sales representative and McQuay International

2 Contents Figures Figures... 2 Revision History... 3 Reference Documents... 3 Limited Warranty... 3 General Information... 4 Hazard Identification Messages... 4 Description... 5 Application... 5 Component Data... 6 Light Emitting Diodes (LEDs)... 6 BACnet Network Connector... 7 J8 Jumper... 7 Installation... 8 Contents of the BACnet Communication Module Kit... 8 Installing a new BACnet Communication Module... 8 Replacing an Existing BACnet Communication Module... 9 Integration Introduction BACnet MS/TP Addressing BACnet MS/TP Configuration Changing the BACnet MS/TP Data Transmission Rate BACnet MS/TP Configurable Parameters BACnet IP Addressing BACnet IP Configuration BACnet IP Configurable Parameters BACnet Ethernet Configuration BACnet Ethernet Configurable Parameters Service Information...18 Troubleshooting General BACnet IP BACnet MS/TP Parts List Figure 1. BACnet Communication Module Attached to Chiller Unit Controller... 5 Figure 2. BACnet Communication Module Components... 6 Figure 3. OITS Display of Network Parameters BAS Figure 4. OITS Display of Network Parameters BAS IM 963

3 Revision History IM 963 April 2010 Initial release Reference Documents Number Company Title Source ANSI/ASHRAE American Society of BACnet A Data Communication Protocol for Building Heating, Refrigerating and Air-Conditioning Engineers Automation and Control Networks OM 1034 McQuay International Magnitude Frictionless Centrifugal Chiller Operation and Maintenance Manual ED McQuay International Magnitude Chiller Unit Controller Protocol Information, BACnet and LONWORKS Networks ED McQuay International Magnitude Chiller Unit Controller Protocol Information, BACnet Protocol Implementation Conformance Statement (PICS) Limited Warranty Consult your local McQuay Representative for warranty details. Refer to Form Y. To find your local McQuay Representative, go to Notice Copyright 2010 McQuay International, Minneapolis MN. All rights reserved throughout the world. McQuay International reserves the right to change any information contained herein without prior notice. The user is responsible for determining whether this software is appropriate for his or her application. The following are tradenames or registered trademarks of their respective companies: BACnet from the American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc.; Windows from Microsoft Corporation; Daikin McQuay, McQuay and Magnitude from McQuay International. IM 963 3

4 General Information This manual contains the information you need to install the BACnet Communication Module on a Magnitude Frictionless Centrifugal Chiller Unit Controller, incorporate it into the BACnet network, and maintain it. Hazard Identification Messages! DANGER Dangers indicate a hazardous situation which will result in death or serious injury if not avoided.! WARNING Warnings indicate potentially hazardous situations, which can result in property damage, severe personal injury, or death if not avoided.! CAUTION Cautions indicate potentially hazardous situations, which can result in personal injury or equipment damage if not avoided.! WARNING Electric shock hazard. Can cause personal injury or equipment damage. This equipment must be properly grounded. Connections and service to the Magnitude Chiller Unit Controller must be performed only by personnel knowledgeable in the operation of the equipment being controlled.! CAUTION Static sensitive components. Can cause equipment damage. Discharge any static electrical charge by touching the bare metal inside the control panel before performing any service work. Never unplug cables, circuit board terminal blocks, or power plugs while power is applied to the panel. NOTICE This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with this instruction manual, may cause interference to radio communications. It has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his or her own expense. McQuay International disclaims any liability resulting from any interference or for the correction thereof. 4 IM 963

5 Description The BACnet Communication Module incorporates a Magnitude Chiller Unit Controller into a BACnet local area network (LAN) and provides access to the unit controller parameters via BACnet MS/TP, BACnet IP, or BACnet Ethernet. See Table 2 for a detailed description of each network connection. The BACnet Communication Module attaches to the upper left section of the Magnitude Chiller s main unit controller circuit board. This area is labeled BAS Interface Board (see Figure 1.) The main unit controller circuit board itself is labeled Chiller I/O Backplane and will be referred to as such for the remainder of this document. Figure 1. BACnet Communication Module Attached to Chiller Unit Controller BACnet communication module (attached) Application The BACnet Communication Module connects the Magnitude Chiller Unit Controller to a building automation system (BAS) on a BACnet local area network. It is the interface for the exchange of BACnet objects between the network and the unit controller. Refer to the Magnitude Frictionless Centrifugal Chiller Operation & Maintenance Manual (OM 1034) for unit controller details. For a complete list of available BACnet points, refer to the Magnitude Chiller Unit Controller - Protocol Document, ED (all literature available on IM 963 5

6 Component Data Figure 2 shows the important features of the BACnet Communication Module, which include the LED locations, network connections, and J8 jumper. Figure 2. BACnet Communication Module Components Common BACnet MS/TP Network Connector + - BACnet IP/Ethernet Network Connector D2 D4 Ethernet LED D5 J8 Jumper D7 D9 D8 Light Emitting Diodes (LEDs) The BACnet Communication Module has six LEDs to indicate communication activity and data transmission status. These indicators are visible when the communication module is connected to the Magnitude Chiller I/O Backplane and the unit is powered on. See Figure 2 for LED locations and Table 1 for descriptions of LED activity. 6 IM 963

7 Table 1. Description of LED Activity LED Color Meaning D2 Green Communication module supports a BACnet network. If present, this LED will always be lit when 5VDC power (supplied from the chiller unit controller) is present. D4 Yellow Indicates local 3.3 VDC power is present. D5 Yellow Flashes when the communication module transmits data to the chiller unit controller. D7 Green Flashes when the communication module receives data from the chiller unit controller. D8 Green Flashes when the communication module receives data from the BACnet network. D9 Yellow Flashes when the communication module transmits data to the BACnet network. BACnet Network Connector The BACnet communication module can be used to connect to a BACnet MS/TP, BACnet IP, or BACnet Ethernet network. There are two separate network connectors available, depending on the type of network that is connected. See Table 2 below. Table 2. BACnet Network Connection Details Network BACnet MS/TP Connector Type An RS485 connector links the BACnet Communication Module to the MS/TP network. The connector port has three pins: +, -, and Common. Pin 1 COM Common (isolated from host controller) Pin 2 Tx/Rc + EIA485 Transmit/Receive Positive BACnet IP or BACnet Ethernet Pin 3 Tx/Rc - EIA485 Transmit/Receive Negative An RJ45 connector links the BACnet Communication Module to the BACnet IP or BACnet Ethernet network. The LEDs for this connector function as follows: Green This LED flashes to indicate Ethernet activity. If configured for MS/TP, this LED does not flash green, even if it is connected to an active Ethernet port. Yellow This LED indicates the port speed. The communication module always operates in full-duplex mode. If the output is Off, the speed is 10 mbps. If the output is On, the speed is 100 mbps. 16-Pin Header The 16-pin header connects the Chiller I/O Backplane to the BACnet communication module through the bottom of the communication module. The pins are on located on the back side of the of the communication module. J8 Jumper The BACnet Communication Module has a built-in terminating resistor labeled J8 on the circuit board. The communication module ships with the jumper installed, providing 120 Ohms of end-ofline resistance to the network. Typically, a network is terminated at each end of each segment. However, it is the responsibility of the system installer/integrator to recommend whether or not to terminate a device within the network. If the device does not require terminating resistance, or if an external terminating resistor is used, the jumper on J8 should be removed. See Figure 2 for location. IM 963 7

8 Installation The following section describes how to field install a new BACnet Communication Module or replace an existing BACnet Communication Module on the Magnitude Chiller I/O backplane (i.e. unit controller main circuit board) so that it can be incorporated into the BACnet network.! CAUTION Electrostatic discharge hazard. Can cause equipment damage. This equipment contains sensitive electronic components that may be damaged by electrostatic discharge from your hands. Before you handle a communications module, you need to touch a grounded object, such as the metal enclosure, in order to discharge the electrostatic potential in your body. Contents of the BACnet Communication Module Kit The following is the list of items included in the field-installed kit: The BACnet Communication Module BACnet MS/TP Network connector (attached to communication module) J8 jumper (attached to communication module) Two screws Installation Manual IM 963 Installing a new BACnet Communication Module Follow these steps to install a new BACnet Communication Module on the Magnitude Chiller I/O backplane.! WARNING Electric shock hazard. Can cause personal injury or equipment damage. This equipment must be properly grounded. Only personnel knowledgeable in the operation of the equipment being controlled must perform connections and service to the unit controller. 1. Remove power from the Magnitude Chiller Unit Controller. 2. Connect the BACnet Communication Module to the upper left corner of the chiller I/O backplane, in the area labeled BAS Interface Board (see Figure 1). Carefully align the holes on the communication module with the two standoffs attached to the chiller I/O backplane.! CAUTION Carefully align the holes on the communication module with the standoffs on the chiller I/O backplane. Powering up the controller with the communication module installed upside down can cause damage to the communication module. 3. Using the two screws that came with the communication module kit, attach the communication module to the standoffs located on the chiller I/O backplane. 4. Connect the communication module to the network (see Figure 2 for location of network connection). 5. Apply power to the unit controller. 8 IM 963

9 Replacing an Existing BACnet Communication Module Follow these steps to remove an existing BACnet Communication Module from the chiller I/O backplane and replace it with a new BACnet Communication Module.! WARNING Electric shock hazard. Can cause personal injury or equipment damage. This equipment must be properly grounded. Only personnel knowledgeable in the operation of the equipment being controlled must perform connections and service to the Magnitude Chiller Unit Controller. 1. Remove power from the unit controller. 2. Locate the communication module. It is situated at the upper left corner of the chiller I/O backplane (see Figure 1). 3. Remove the network cable connector from the communication module. 4. Remove the two screws holding the communication module in place. 5. Grasp the communication module and carefully pull it from the chiller I/O backplane. 6. Install the new communication module (see Steps 1-3 from previous section). 7. Re-attach the two screws to secure the communication module to the chiller I/O backplane. 8. Insert the network cable connector into the communication module. 9. Apply power to the unit controller. IM 963 9

10 Integration Introduction Once the BACnet Communication Module has been properly installed on the unit controller, it is then possible to integrate the unit controller into a building automation system (BAS) via the BACnet network. The addressing and configuration process is described separately for each protocol (BACnet MS/TP, BACnet IP, and BACnet Ethernet) in the following sections. The BACnet Communication Module can be configured using the Magnitude chiller unit controller Operator Interface Touch Screen (OITS) display. The unit is ready to operate after you have configured the parameter values of the unit controller for your particular network. Refer to the Magnitude Chiller Operation and Maintenance Manual (OM 1034) for default values and unit controller OITS operating instructions. Refer to McQuay Protocol Document ED for descriptions of all the available BACnet parameters. Figures 3 and 4 show the chiller unit controller OITS display screens with the corresponding network parameters available for configuration. These two screens (titled BAS1 and BAS2) are accessed by pressing the BAS button at the top of the column on the right-hand side of the main unit controller OITS display. Note: Refer to the Magnitude Chiller Operation and Maintenance Manual (OM 1034) for details regarding accessing and using the unit controller OITS display. BACnet MS/TP Addressing The BACnet MS/TP Media Access Control (MAC) address is a one-octet address that must be set during the BACnet Communication Module configuration. The MAC address must be unique to the MS/TP network and have a valid range of Additionally, there are certain parameters that must be set properly to verify communication between Magnitude Chiller Unit Controller and the MS/TP network. Table 3 provides details about these addressing parameters. See your system integrator for additional information regarding proper BACnet MS/TP addressing. BACnet MS/TP Configuration 1. Open the Magnitude chiller unit controller OITS display screen. 2. Press the SET button, located at the bottom of the screen. 3. Press the BAS button from the top of the column on the right-hand side of the screen. 4. Press the 1 button, located to the right of the BAS Network Protocol field. The BAS Network Protocol field should now be highlighted (see Figure 3). 5. Press the Change button. 6. If prompted, enter the password 100 and press Enter. Otherwise, proceed to step Press the Change button. 8. Select BACnet MSTP from the drop-down menu. 9. Press the Enter button. 10. Press the BAS button to access the second BAS screen (BAS2). 11. Set the BACnet MS/TP MAC Address within the valid range of Verify the baud rate of the unit controller (see next section, Changing the BACnet Data Transmission Rate, for details). 13. Modify the remaining BACnet parameters as necessary. See Table 3 for a complete list. 10 IM 963

11 14. Cycle power to the unit controller. Changing the BACnet MS/TP Data Transmission Rate The options for baud rate (in bps) include: 9600, 19200, 38400, The factory default baud rate is bps. Follow the steps below to change the baud rate for desired network speed via the OITS display: 1. If you are at the BAS2 screen, proceed to Step 4 (see Figure 4). 2. If you are on the BAS1 screen, press the BAS button and proceed to Step From any other screen, press the SET button once and then press the BAS button twice. 4. Press the 5 button, located to the right of the BACnet MS/TP - Baud Rate field. The BACnet MS/TP - Baud Rate field should now be highlighted. 5. Press the Change button. 6. If prompted, enter the password 100 and press Enter. Otherwise, proceed to step Press the Change button. 8. Press the desired baud rate from the drop-down menu. 9. Press the Enter button. The new baud rate will take effect in approximately 60 seconds. BACnet MS/TP Configurable Parameters Table 3 defines the BACnet Communication Module network parameters that are configurable via the unit controller OITS display. Additional parameters are also configurable from the Building Automation System (BAS). For a complete list of available BACnet points, refer to the Magnitude Chiller Unit Controller Protocol Document, ED15117 (available on The following parameters are all read from the unit controller during the communication module s initialization phase. If any parameter in Table 3 (except BAS Network Protocol and English/Metric) is changed at via the unit controller OITS display during run-time, the update is automatically applied to the BACnet communication module as soon as the change is received. Change parameters as required for your network. At a minimum, you must set the following before establishing network communication between the unit controller and the BAS: 1. BAS Network Protocol 2. Device Instance 3. MAC Address 4. Verify the correct baud rate and change if necessary IM

12 Table 3. BACnet MS/TP Configuration Parameters Parameter Value (Range)/Definition Initial Value/Note BAS Network Protocol Device Instance MAC Address 1 Object Name Baud Rate 1 Max Masters Max Info Frames English / Metric BACnet MSTP/This point sets the desired network protocol /Device Instance of the BACnet communication module / This is the MS/TP address of the BACnet communication module. The allowable range of characters for the device object name is 1 to 31 characters. /If an empty string is read from the controller, the initial value is used. The device object name is visible to BACnet as the object name of the device object / Data transfer speed / This variable specifies the highest possible address for master. nodes and must be set to less than or equal to / This variable specifies the maximum number of information frames the BACnet communication module may send before it must pass the token. English (0)-Metric(1)/Determines the type of units that are passed through the BACnet network. 1 Parameter only available via the unit controller OITS display None/Set this value to BACnet MS/TP. The unit controller must be reset after changing this parameter. 3000/This must be unique throughout the entire BACnet network. If a value greater than is read from the controller, the following default value will be used: address. Address = the last two octets of the MAC Address. 1/ Each device on the BACnet network must have a unique MS/TP address. Magnitude/ This name must be unique throughout the entire BACnet network. If an empty string is read from the controller, the BACnet communication module uses the following default: MTE Chiller UCA-address Where address is the MAC address. Changing the device object name may affect the operation of other BACnet devices on the network that have previously discovered the device. The BACnet communication module may take up to 60 seconds before this change is recognized. A power cycle is not needed English/To set the unit for Metric, set this variable to Metric. Cycle power to the unit controller after changing this parameter. 12 IM 963

13 BACnet IP Addressing There are key parameters of the BACnet/IP MAC layer that require configuration prior to connecting the unit controller to the BACnet network. These parameters require configuration via the chiller unit controller OITS display. They are not accessible from the BACnet network or BAS. These parameters include: IP Address Subnet Mask UDP Port Default Gateway Address BBMD Address Foreign Device Time-To-Live There are other parameters available via the chiller unit controller OITS display (Device Instance and Device Name, for example) that are also configurable via the BACnet network or BAS. See Table 4 for details. Note: Refer to the Magnitude Chiller Operation and Maintenance Manual (OM 1034) for details regarding accessing and using the Magnitude Chiller Unit Controller OITS display. BACnet IP Configuration 1. Open the Magnitude chiller unit controller OITS display screen. 2. Press the SET button, located at the bottom of the screen. 3. Press the BAS button from the top of the column on the right-hand side of the screen. 4. Press the 1 button, located to the right of the BAS Network Protocol field. The BAS Network Protocol field should now be highlighted (see Figure 3). 5. Press the Change button. 6. If prompted, enter the password 100 and press Enter. Otherwise, proceed to step Press the Change button. 8. Select BACnet IP from the drop-down menu. 9. Press the Enter button. 10. Press the BAS button. 11. Modify the remaining BACnet parameters as necessary. See Table 4 for a complete list. 12. Cycle power to the unit controller. Note: Device Instance, IP Address and Object Name must all be unique throughout the network. BACnet IP Configurable Parameters Table 4 defines the network parameters of the BACnet Communication Module that must be configured in order to establish communication between Magnitude Chiller Unit Controller Unit and the BACnet IP network. These parameters are set using the unit controller OITS display. These parameters are all read from the Magnitude Chiller Unit Controller during the BACnet communication module s initialization phase. Change parameters as required for your network. IM

14 Table 4. BACnet/IP Parameters Name BAS Network Protocol Device Instance Object Name Network Address Subnet Mask UDP Port Value (Range)/Definition BACnet IP/This point sets the desired network protocol /Device Instance of the BACnet Communication Module. The allowable range of characters for the device object name is 1 to 31 characters./if an empty string is read from the unit controller, the Initial Value is used. The device object name is visible to the BACnet network as the object name of the device object. IP Address of the BACnet Communication Module Subnet Mask of the BACnet Communication Module (User Datagram Protocol) Identifies the application process in the destination unit Initial Value/Note None/Set this value to BACnet IP. Cycle power to the unit controller after changing this parameter. 3000/This must be unique throughout the entire BACnet network. If a value greater than is read from the unit controller, the following default value is used: address. Where address is the last two octets of the MAC address. Magnitude/ This name must be unique throughout the entire BACnet network. If an empty string is read from the controller, the BACnet card will use the following default: MTE Chiller UCA-address Where address is the Ethernet MAC address. Changing the device object name may affect the operation of other BACnet devices on the network that have previously discovered the device. The BACnet Communication Module takes up to 60 seconds before this change is recognized. A power cycle is not needed / If the IP address is changed via the unit controller OITS display during run-time, the update is automatically applied to the BACnet Communication Module as soon as the change is received. The IP address is checked for validity as an IP address and against the Subnet Mask. If the address is not valid, the BACnet Communication Module does not enable BACnet/IP communications. The device does not initiate or respond to BACnet messages. If the IP address is changed at run-time and the address is not a valid IP address, the change is ignored. The existing address remains in effect. Changing the IP address may affect the operation of other BACnet devices on the network that may be dependent on objects within the device / If the Subnet Mask is changed, the update is automatically applied to the BACnet Communication Module as soon as the change is received. The Subnet Mask is checked for validity against the IP address. If the Subnet Mask is not valid, the BACnet Communication Module does not enable BACnet/IP communications. The device does not initiate or respond to BACnet messages. If the Subnet Mask is changed at run-time and the Subnet Mask is not a valid Subnet Mask, the change is ignored. The existing mask remains in effect Changing the Subnet Mask may affect the operation of other BACnet devices on the network that may be dependent on objects within the device / If the UDP Port is changed, the update is automatically applied to the BACnet Communication Module as soon as the change is received. Changing the UDP Port may affect the operation of other BACnet devices on the network if they are dependent on objects within the device. 14 IM 963

15 Name Default Gateway BBMD IP Address Foreign Device Time English / Metric Value (Range)/Definition Gateway address IP Address for the BACnet Broadcast Management Device (BBMD) if used / The time, in seconds, within which the foreign device must re-register with the BBMD. If it does not re-register, the BBMD removes it from its Foreign Device Table (FDT) and discontinues forwarding messages to the foreign device. English (0)- Metric(1)/Determines the type of units that are passed through the BACnet network. Initial Value/Note None / If the default gateway address is changed, the update is automatically applied to the BACnet Communication Module as soon as the change is received. Changing the default gateway address may affect the operation of other BACnet devices on the network if they are dependent on objects within the device. None / If the BBMD address is not 0, the BACnet Communication Module sends a Register-Foreign-Device message to the address. If the result code returned is X 0000, the BACnet Communication Module renews the registration at the period defined by the Foreign Device Time-To-Live value. If the BBMD address is changed, the update is automatically applied to the BACnet Communication Module as soon as the change is received. If the new value is 0, the existing signup is no longer refreshed and will be allowed to expire. In other words, when a BBMD IP address is defined here, a Register- Foreign-Device message is sent to register the chiller unit controller s IP address with the BBMD. This message is continuously sent out before the Foreign Device Time expires. If the new value is non-zero, a Register-Foreign- Device message is sent to the BBMD address that has been defined by this parameter. Changing the BBMD address may affect the operation of other BACnet devices on the network if they are dependent on objects within the device. 0/ If the Foreign Device Time-To-Live (FDTTL) is changed, the update is automatically applied to the BACnet Communication Module as soon as the change is received. If the new value is different from the existing value, a Register-Foreign-Device message is sent to the BBMD address. A minimum TTL of 15 seconds is enforced to avoid excessive network traffic. English/To set the unit for Metric, set this variable to Metric. Cycle power to the unit controller after changing this parameter. BACnet Ethernet Configuration 1. Open the Magnitude chiller unit controller OITS display screen. 2. Press the SET button, located at the bottom of the screen. 3. Press the BAS button from the top of the column on the right-hand side of the screen. 4. Press the 1 button, located to the right of the BAS Network Protocol field. The BAS Network Protocol field should now be highlighted (see Figure 3). 5. Press the Change button. 6. If prompted, enter the password 100 and press Enter. Otherwise, proceed to step Press the Change button. IM

16 8. Select BACnet Ethernet from the drop-down menu. 9. Press the Enter button. 10. Modify the remaining BACnet parameters as necessary. See Table 5 for a complete list. 11. Cycle power to the unit controller. Note: Device Instance and Object Name must be unique throughout the network. BACnet Ethernet Configurable Parameters Table 5 defines the network parameters of the BACnet Communication Module that must be configured in order to establish communication between Magnitude Chiller Unit Controller Unit and the BACnet IP network. These parameters must be set using the unit controller OITS display. The BACnet Ethernet MAC Address can also be read via the unit controller OITS display. Table 5. BACnet Ethernet Parameters Name Value (Range)/Definition Initial Value/Note BAS Network Protocol Device Instance Object Name BACnet Ethernet/ This point sets the desired network protocol /Device Instance of the BACnet Communication Module. The allowable range of characters for the device object name is 1 to 31 characters./if an empty string is read from the unit controller, the Initial Value is used. The device object name is visible to the BACnet network as the object name of the device object. None/Set this value to BACnet Ethernet. Cycle power to the unit controller after changing this parameter. 3000/This must be unique throughout the entire BACnet network. If a value greater than is read from the unit controller, the following default value is used: address Where address is the last two octets of the MAC address. Magnitude/ This name must be unique throughout the entire BACnet network. If an empty string is read from the controller, the BACnet card will use the following default MTE Chiller UCA-address Where address is the MAC address. Changing the device object name may affect the operation of other BACnet devices on the network that have previously discovered the device. The BACnet Communication Module takes up to 60 seconds before this change is recognized. A power cycle is not needed. Note: If unit controller application software requires uploading in the field, the network configuration parameters revert to their default values. Please contact the McQuay Chiller Technical Response Center at for assistance with upgrading unit controller application software. 16 IM 963

17 Figure 3. OITS Display of Network Parameters BAS1 Figure 4. OITS Display of Network Parameters BAS2 IM

18 Service Information Troubleshooting General If you can control the unit from the chiller unit controller OITS display, but you are not able to communicate with unit via the BACnet network/bas workstation, follows these steps: Check the network wiring Verify BAS Network Protocol is set correctly using the chiller unit controller OITS display. Check the network parameters and verify that they are correct and that there are no duplicate devices on the network. Verify that the serial cable is connected from the CPU to the chiller I/O backplane board at J16 (ribbon cable) is connected. Reduce (isolate) the network to one single unit controller. Once this small network is working properly, continue to add more devices to the network. BACnet IP If Protocol Type is set to BACnet IP, use the standard TCP/IP suite of protocols to check your connectivity with other devices. Using the PC s Windows Command Prompt, type ping <IP address of the BACnet Communications Module>. If you get a response from that IP address, you are connected to the BACnet Communication Module. If you do not get a response, verify the BACnet Communication Module and the PC network settings. BACnet MS/TP BACnet MS/TP-specific communication errors could result from one or more of the following conditions below. Follow these steps: Verify that there are no duplicate MAC Addresses and/or Device-IDs on the network. Check that no more than two network bias resistors are installed. Confirm that all terminations exist and/or remove any invalid terminations, particularily in the middle of the bus. Verify that polarity is correct (a single node can disrupt the MS/TP network.) Check that there are no more than 32 devices installed in a single segment (using standard transceivers.) Verify correct topology (e.g. a star topology rather than a straight bus topology) may impact physical medium (Layer 1). You should carefully follow the EIA-485 specifications (see If the BACnet Communication Module still does not respond, contact the McQuay Controls Customer Support Group at 866-4MCQUAY ( ). Parts List Description BACnet Communication Module kit (kit includes communication module with attached network connector, screws, and Installation Manual) Part Number IM 963

19 This document contains the most current product information as of this printing. For the most current product information, please go to All McQuay equipment is sold pursuant to McQuay s Standard Terms and Conditions of Sale and Limited Warranty. (800)