Schneider Electric Modicon BM85 - Manual (Page 98)

Compatible Devices and Cables 88 88
890 USE 103 00
A.4 RS485 Ports Pinout
This section covers the serial ports pinout for the following models:
Part Number
Mounting
Method
Operating
Power
(Nominal) Modbus Plus
Network
Cable
Serial
Ports Serial
Protocol
NW–BM85E485 Panel or Shelf 115/230 Vac or
24 Vdc Single or Dual RS485 Programmable,
User Defined
NW–BM85S485 Panel or Shelf 115/230 Vac or
24 Vdc Single or Dual RS485 Programmable,
User Defined
Figure 27 shows the pin configuration for the RS485 port connectors. If
you are fabricating cables for your application, the panel connector is a
DB9S.
The Modbus Plus inline connector (part number AS-MBKT-085) is an
acceptable substitute for an RS485 cable connector. Do not use a
Modbus Plus terminating connector (AS-MBKT-185) in this
application.
5 4 3 2 1
9 8 7 6
REAR PANEL
SERIAL PORT
CONNECTORS
Figure 27 Serial Ports Pinout – RS485
Pin BM85 Direction Purpose
1 –– Chassis ground
2 In/Out Receive/Transmit A
3 In/Out Receive/Transmit B
4 ... 9 –– not used