37
W&T The serial combi-port
Subject to error and alteration
5�2 RS232 mode (factory default)
The pin configuration of the RS232 port is identical to that of
a PC, which allows you to use standard cables.
DIP switch setting RS232
Mode SW1 SW2 SW3 SW4 SW5 SW6 SW7 SW8
RS232 OFF OFF OFF OFF OFF OFF OFF ON
1
The terminating DIL switches SW6 and SW7 must
never be in the ON position when using the module in
RS232 mode. This will result in a significant increase in the
current draw and may cause the RS232 driver to fail.
Pin assignment and function RS232, D9 male
Pin Direction Signal Description Default Function (*)
1 IN DCD Data Carrier
Detect
Ignored
2 IN RxD Receive Data Data in
3 OUT TxD Transmit Data Data out
4 OUT DTR Data Terminal
Ready
12V for existing TCP connection
to a client or server
5 --- GND Signal Ground ---
6 IN DSR Data Set Ready Ignored
7 OUT RTS Ready To Send Handshake output
+12V = ready to receive data
- 12V = not ready to receive data
8 IN CTS Clear To Send Data output only if +3...12V
9 IN RI Ring Indicator Ignored
(*) Applies only to the hardware handshake setting
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