DEC Dual RS-232

From HwB

Found on the DEC Multia and DEC UDB (Universal Desktop Box). It contains two Serial ports on one connector. The 1st Port is located on the normal pins, and the 2nd port is located on some "spare" pins.

Pinout

Dsub25m.png

25 PIN D-SUB MALE at the computer.

Pin Port Name Dir Description
1 n/c Not connected
2 1 TXD Arrowr.png Transmit Data
3 1 RXD Arrowl.png Receive Data
4 1 RTS Arrowr.png Ready To Send
5 1 CTS Arrowl.png Clear To Send
6 1 DSR Arrowl.png Data Set Ready
7 1+2 GND - Ground
8 1 DCD Arrowl.png Data Carrier Detect
9 n/c Not connected
10 n/c Not connected
11 2 DTR Arrowr.png Data Terminal Ready
12 2 DCD Arrowl.png Data Carrier Detect
13 2 CTS Arrowl.png Clear To Send
14 2 TXD Arrowr.png Transmit Data
15 n/c Not connected
16 2 RXD Arrowl.png Receive Data
17 n/c Not connected
18 n/c Not connected
19 2 RTS Arrowr.png Ready To Send
20 1 DTR Arrowr.png Data Terminal Ready
21 n/c Not connected
22 1 RI Arrowl.png Ring Indicator
23 2 DSR Arrowl.png Data Set Ready
24 n/c Not connected
25 2 RI Arrowl.png Ring Indicator

Note: Direction is DTE (Computer) relative DCE (Modem).

Contributions

Sources