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The Communication Port is configured as a DCE device. To communicate with a DTE device such as a
workstation, use a standard (or straight-through) RS232 cable. To communicate with a DCE device, use
either a null modem adapter in line with a standard RS232 cable, or a null-modem serial cable.
RS232 Pin Configuration
Refer to this table if you want to make your own cables.
To do so, you must determine if your host RS232 device is:
• 9-pin or 25-pin and
• configured as a DCE or DTE device.
Serial Connector
The base connector is straight to the printed circuit board (PCB). This can power a peripheral device, such
as a mobile printer.
Note: Signals referenced are for a DTE device.
Base/Host Port (DCE) IBM AT DB9
(DTE)
IBM XT DB25
(DTE)
Modem DB25
(DCE)
Pin / Input Signal
2 / (RD) 23 2
3 / (TD) 32 3
5 / (SG) 57 7
4 / (DTR) 420 6
6 / (DSR) 6620
7 / (RTS) 74 5
8 / (CTS) 85 4
Pin Description
1 Internal Jumper to Pin 6
2TXD
3RXD
4DSR
5GND
6DTR
7CTS
8RTS
95 Volt Out