Emerson ControlWave, Instruction Manual

Page: 43 / 156

ControlWave Instruction Manual (CI-ControlWave)
Revised Nov-2010 Installation 2-27

Ensure that DCD is high to transmit

Set CTS to high to transmit.

If the port is set for full-duplex operation, RTS is always ON.

Ensure that DTR is always high when port is active
Note
:
Control DTR using the PORTCONTROL function block and
the _P
n
_AUTO_DTR system variable in your ControlWave
project. If you turn DTR off through these mechanisms, the
port remains off, even though hardware is fully configured.

When port is set for half-duplex operation, CTS must go low after
RTS goes low.

All RS-232 comm ports are protected by surge protectors (to

8KV
ESD).
2.4.3 Connections to RS-485 Serial Port(s) on the Secondary
Communication Board (SCB)
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 may have either one or two RS-485 ports.
RS-485 COM
Port Names and
Connectors
RS-485 COM ports are assigned names based on their location in the
ControlWave.

COM3 on the SCB board can be purchased as either an RS-232 port,
or as an RS-485 port.

COM4 on the SCB board is always an RS-485 port.
Table 2-9. RS-485 Connectors on SCB
Connector Name Function Notes
J2 COM3 8-pin RJ-45 (RS-485) See
Figure 2-11
&
Table 2-10
J3 COM4 9-pin male D-sub (RS-485) See
Figure 2-10 & Table 2-11
RS-485 COM
Port Cables
Figure 2-10
illustrates the CPU module’s male 9-pin D-type connector.
Use the content provided in
Table 2-12
to determine pin assignments for
the COM3 port on the CPU, and COM5/9, COM6/10, and COM7/11
expansion communication ports.
Table 2-10. RS-485 COM3 Port (RJ-45) Connector Pin Assignment
Pin
RS-485
Signal RS-485 Description
1
2 RXD+ Receive Data + Input