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W&T
Pin configuration
The RS232/RS422/RS485 connection for the modules is
configured as a 9-pin male SUB-D connector, with the TTL
interface formatted as 12-pin male post connector. Refer to the
following table for connector pin assignments:
TTL interface
pin#
signal
RS232
1
5V ±5%
Vcc
2
RI
output
3
RxD
output
4
TxD
input
5
n.c.
n.c.
6
CTS
output
7
DTR
input
8
DSR
output
9
RTS
input
10
DCD
output
11
12V ±10%
n.c.
12
GND
signal GND
Pin 1 of the TTL interface is indicated by a rectangular soldering pad.
RS232 interface
pin#
signal
1
DCD
2
RxD
3
TxD
4
DTR
5
GND
6
DSR
7
RTS
8
CTS
9
RI
62
RS422/485
Vcc
"low" level
output
input
n.c.
output
input
"low" level
input
"low" level
n.c.
signal GND
RS422/RS485 interface
function
pin#
input
1
input
2
output
3
output
4
GND
5
input
6
output
7
input
8
input
9
Interface modules
signal
function
TXD A
output
RxD A
input
DTR A
output
CTS A
input
GND
GND
TXD B
output
RxD B
input
DTR B
output
CTS B
input
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