Schneider Electric Modbus Plus Network Bridge Multiplexer none - Manual (Page 87)

Installing the BM85 31007492 77
5.3.1 Connecting a Single Network Cable
On single-cable networks, connect the Modbus Plus cable to the BM85
Modbus Plus connector.
5.3.2 Connecting Dual Network Cables
On dual-cable networks, connect Modbus Plus cables A and B to the
correct connectors on the BM85 rear panel. Make sure to identify the
correct cables and connectors.
5.3.3 Connecting Dual-Cable Units on Single-Cable Networks
If you are installing a dual-cable unit on a network that has only a
single cable, connect the cable to the rear panel CHANNEL A connector.
Plug a Terminating Connector (Modicon part number AS-MBKT-185)
into the CHANNEL B connector.
5.3.4 Connecting Serial Port Cables
Connect the serial port device cables to the four connectors on the rear
panel. Make sure to identify the correct device cables and connectors.