Connections To Rs-485 Serial Port On The Secondary Communication Board (Scb) - Emerson ControlWave Instruction Manual

ControlWave I/O Expansion Rack Instruction Manual
2.4.3 Connections to RS-485 Serial Port on the Secondary
Communication Board (SCB)
RS-485 COM
Port Name and
Connector
Connector Name
J2 COM3
RS-485 COM
Port Cables
2-32
The RS-485 port supports local network communications to multiple
nodes up to 4000 feet away.
If you purchased your CPU module with a secondary communication
board (SCB) you have a single RS-485 port.
COM3 on the SCB board is an RS-485 port.
Table 2-12. RS-485 Connectors on SCB
Function
8-pin RJ-45 (RS-485)
Figure 2-22 shows the RJ-45 connector used for COM3 on the SCB. If
you ordered the SCB. See Table 2-13 for pin assignments.
RJ-45 Connector Associated with COM3, ETH2, ETH3
Figure 2-22.
Table 2-13. RS-485 COM3 Port (RJ-45) Connector Pin Assignment
Pin
1
2
3
4
5
6
7
8
Since the RS-485 port is intended for network communications, refer to
Table 2-14 for the appropriate connections for wiring the master, first
slave, and nth slave.
Essentially, the master and the first slave transmit and receive data on
Installation
Notes
See Figure 2-22 & Table 2-13
(all on SCB)
RS-485
Signal RS-485 Description
RXD+ Receive Data + Input
RXD- Receive Data – Input
TXD- Transmit Data – Output
TXD+ Transmit Data + Output
ISOGND Isolated Ground
Revised Aug-2015