9
2.4 Recommended System Connections
The following connections are recommended by PPM for best performance from the optical modules
and apply to all types of module packages listed in this document. Since the optical path is shared
between RS422 and RS232 interfaces, only one signal can be transmitted through the optical link at one
time.
2.4.1 RS422
Tx
RS422 OUT+
RS422 OUT-
RS422 IN+
RS422 IN-
Optical Module
Rx
RS422 OUT-
RS422 OUT+
Tx
RS422 IN-
RS422 IN+
Rx
Optical Module
Optical Fibre
B
A
B
RD
Terminal 1
TD
A
B
B
A
Terminal 2
RD
A
TD
GND
GND
GND
GND
Optical Rx
Optical Tx
Optical Tx
Optical Rx
2.4.2 RS232
Tx
RS232 IN
RS232 OUT
Rx
Optical Module
Tx
RS232 OUT
Rx
RS232 IN
Optical Module
Optical Fibre
RD
TD
Terminal 1
Terminal 2
RD
TD
GND
GND
GND
GND
Optical Rx
Optical Rx
Optical Tx
Optical Tx
Note that there must be a signal ground connection between the optical module and the terminal for
correct signalling.
Summary of Contents for LSx-x2-HB-4
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