Serial Port Connectors; Com1 - Xycom 3700 Series User Manual

3700 Series Flat Panel Industrial PC

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.
RS-232
Pin
1A
2A
3A
4A
5A
6A
7A
8A
9A
For TXD termination, connect a 150Ω, 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 150Ω, 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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Table C - 5. COM1 Connector Pinout
Signal
DCD1
RXD1
TXD1
DTR1
GND
DSR1
RTS1
CTS1
RI1
68
RS-485
Pin Signal
1B TXD –
2B TXD+
3B TXD TERM –
4B TXD TERM +
5B GND
6B RXD –
7B RXD +
8B RXD TERM +
9B RXD TERM –
Note
Appendix C – Pinouts
143311 (H)