DEC Dual RS-232

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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.

25 PIN D-SUB MALE 25 PIN D-SUB MALE at the computer

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

Notes

  • Direction is DTE (Computer) relative DCE (Modem)

References

Category:Serial Connectors

 

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