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ControlWave Instruction Manual (CI-ControlWave)

2-28 Installation Revised Nov-2010

RS-485

Signal

RS-485 Description

3 RXD- Receive Data – Input

5 TXD- Transmit Data – Output

7 TXD+ Transmit Data + Output

8 ISOGND Isolated Ground

Table 2-11. RS-485 COM4 Port (Male DB9) Connector Pin Assignment

RS-485

Signal

RS-485 Description

2 RXD- Receive Data - Input

3 TXD- Transmit Data - Output

4 TXD+ Transmit Data + Output

5 ISOGND Isolated Ground

6 RXD+ Receive Data + Input

Since the RS-485 port is intended for network communications, refer to

Table 2-12 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

opposite lines; all slaves (from the first to the nth) are paralleled (daisy-

chained) across the same lines. Wire the master node to one end of the

RS-485 cable run using a 24-gauge paired conductor cable (such as a

Belden 9843).

Note: ControlWave only supports half-duplex RS-485 networks.

Table 2-12. RS-485 Network Connections

From Master To First Slave To nth Slave

TXD+ RXD+ RXD+

TXD– RXD– RXD–

RXD+ TXD+ TXD+

RXD– TXD– TXD–

ISOGND ISOGND ISOGND

Emerson ControlWave User Manual

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