
3700 Series Flat Panel Industrial PC
Appendix C – Pinouts
68
143311 (H)
Serial Port Connectors
Both RS-232 and RS-485 serial ports are supported. However, only one connector can
be used at a time, as all termination is done outside the unit. Refer to the AIM3 manual
for different RS-485 connectors.
COM1
The following table lists the signal definitions for the COM1 DB-9 connectors.
Table C - 5. COM1 Connector Pinout
RS-232
RS-485
Pin
Signal
Pin
Signal
1A
DCD1
1B
TXD –
2A
RXD1
2B
TXD+
3A
TXD1
3B
TXD TERM –
4A
DTR1
4B
TXD TERM +
5A
GND
5B
GND
6A
DSR1
6B
RXD –
7A
RTS1
7B
RXD +
8A
CTS1
8B
RXD TERM +
9A
RI1
9B
RXD TERM –
Note
For TXD termination, connect a 150
Ω
, ½ watt resistor from pin 3B to pin 4B,
with pin 1B connected to pin 3B and pin 2B connected to pin 4B.
For RXD termination, connect a 150
Ω
, ½ watt resistor from pin 8B to pin 9B, with
pin 6B connected to pin 9B and pin 7B connected to pin 8B.
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