Chatsworth Products Remote Infrastructure Management (RIM-1000) - Manual (Page 132)

Remote Infrastructure Management System - Version 1.0 / July 2014
132 www.chatsworth.com
4.2.2 EIA-485
The EIA-485 COM Port 1 on the RIM-1000 is used to connect the RIM-1000-as a Modbus Master-to one or more Modbus Slave devices
or it is used to connect a Modbus Master device to the RIM-1000 as a Modbus Slave. The Modbus EIA-485 is active over COM1 (TB5
Pins 8, 9 and 10). The EIA-485 port allows communications between one Modbus Master and one or more Modbus Slave devices.
EIA-485 can accommodate up to 4,000 feet (1,219m) of cable length. There are many variations on how terminals are labeled on
EIA-485 2-wire (e.g., some devices use (+) and (-) or A and B, and some use (-) and (+) or B and A. Therefore, if a Slave unit is not
responding, try swapping the wires.
Table COM 1 TB5 Pin Out
Figure 4.3 EIA-485 Wiring Connections
Pin Description
8 EIA-485 (+)
9 EIA-485 (-)
10 Ground