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

Base/Host Port (DCE)

IBM AT DB9

IBM XT DB25

Modem DB25

 

 

(DTE)

(DTE)

(DCE)

 

 

 

 

Pin / Input Signal

 

 

 

 

 

 

 

 

2

/ (RD)

2

3

2

 

 

 

 

 

3

/ (TD)

3

2

3

 

 

 

 

 

5

/ (SG)

5

7

7

 

 

 

 

 

4

/ (DTR)

4

20

6

 

 

 

 

 

6

/ (DSR)

6

6

20

 

 

 

 

 

7

/ (RTS)

7

4

5

 

 

 

 

 

8

/ (CTS)

8

5

4

 

 

 

 

 

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.

Pin

 

Description

 

 

 

 

 

 

 

 

 

1

 

Internal Jumper to Pin 6

 

 

 

 

 

2

 

TXD

 

 

 

 

 

3

 

RXD

 

 

 

 

 

4

 

DSR

 

 

 

 

 

5

 

GND

 

 

 

 

 

6

 

DTR

 

 

 

 

 

7

 

CTS

 

 

 

 

 

8

 

RTS

 

 

 

 

 

9

 

5 Volt Out

 

 

 

 

 

Note:

Signals referenced are for a DTE device.

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