2-4. Interface Connections
U3-1021
2-22
2/99
Westinghouse Proprietary Class 2C
2-4.4. Generic Cabling Schemes
Once the pin-out of the other device’s serial port connector has been determined, a
cable can be made to connect the device to the J2 Port of the LC module. The
module’s transmit signal (RS-232) or signal pair (RS-485/RS-422) must be
connected to the receive signal (RS-232) or signal pair (RS-485/RS-422) of the
other device. Likewise, the LC receive signal or signal pair is connected to the
transmit of the other device.
Generic RS-232 and RS-485/RS-422 cables are shown in Figure 2-12 and Figure 2-
13. Many manufacturers use DB-9 or DB-25 connectors for the serial connection.
Terminal blocks instead of connectors are also common for RS-485/RS-422.
These figures show no pin numbers for the other device since there is much
variation among manufacturers.
Figure 2-12. Generic RS-232 Cabling Scheme
9-Pin Female J2 Applications Port
D Connector at G01
Other Device
Personality Module
RXD
2
TXD
3
GND
5
Signal
Name
Pin
Number
Signal
Name
TXD
RXD
GND
RTS
CTS
DSR
DCD
DTR
Use loopbacks only if needed by device.
Note
