RS-232 Cables

Connect the base to the host workstation or other device by plugging an RS-232 serial cable into the RS- 232 Port (see page 9-3)on the back panel. The wiring of your cable depends on whether the other device is set up as a Data Communication Equipment (DCE) or Data Terminal Equipment (DTE) device.

The base is configured as a DCE device. To communicate with another DCE device, use either a null modem adapter in line with a standard RS-232 cable, or a null-modem serial cable. To communicate with a DTE device such as a computer, use a standard (or straight-through) RS-232 cable.

You can make your own cables by following the pin configuration in the chart below. To do so, you must determine if your host RS-232 device is 9-pin or 25-pin, and whether it is configured as a DCE or DTE device.

RS-232 Pin Configuration

Host Port

IBM AT DB9

IBM XT DB25

Modem DB25

(DCE)

(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

 

 

 

 

 

Note: These bases cannot be daisy-chained.

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