McQuay IM 743

2 IM 743-1
Table of Contents
Figures .................................................................................................................................................. 2
Revision History ................................................................................................................................... 3
Reference Documents ........................................................................................................................... 3
Limited Warranty.................................................................................................................................. 4
General Information.............................................................................................................. 5
Description............................................................................................................................................ 5
Application............................................................................................................................................ 5
Component Data ................................................................................................................................... 6
Modbus Connector............................................................................................................................ 6
8-Pin Header ..................................................................................................................................... 6
Installation ............................................................................................................................. 7
Mounting............................................................................................................................................... 7
Mounting a Modbus Communication Module.................................................................................. 7
Replacing an Existing Modbus Communication Module ............................................................... 10
Unit Setup for Network Control ..................................................................................................... 10
Integration............................................................................................................................ 11
Connecting to the Network ................................................................................................................. 11
Network Topology.......................................................................................................................... 11
Addressing and Establishing Communications................................................................................... 11
Network Address and Baud Rate.................................................................................................... 11
Configuring the Unit Controller.......................................................................................................... 11
Service Information.............................................................................................................13
Test Procedures................................................................................................................................... 13
Replaceable Parts List......................................................................................................................... 13
Network Connection Plug............................................................................................................... 13
Replacement Kits and Parts ............................................................................................................ 13
Figures
Figure 1. Modbus Communication Module – RS-485 (Component Side) ........................................... 5
Figure 2. Modbus Communication Module Major Components .......................................................... 6
Figure 3. Serial Card Slot Location on Unit Controller ........................................................................ 8
Figure 4. Serial Card Slot Detail........................................................................................................... 8
Figure 5. Network Cable Routing and Connections ............................................................................. 9
Figure 6. Network Connection Detail................................................................................................... 9