Specifications

Table C-3. Communications Connectors Pin Assignments
Pin Source Signal CCITT
1
EIA
2
Description
1 GND 102 AB Signal ground
2 KNO2 TX 103 BA Modem transmit-
ted data
3 Modem/printer RX 104 BB Modem received
data
4 KNO2 RTS 105 CA Request to send
5 Modem/printer CTS 106 CB Clear to send
6 Modem/printer DSR 107 CC Data set ready
7 GND 102 AB Signal Ground
8 Modem/printer CD 109 CF Carrier detector
9 Unconnected
10 Unconnected
11 Unconnected
12 Unconnected
13 Unconnected
14 Unconnected
15 Unconnected
16 Unconnected
17 Unconnected
18 Unconnected
19 Unconnected
20 KNO2 DTR 108.2 CD Data terminal
ready
21 Unconnected
22 Modem/printer RI 125 CE Ring indicator
23 Unconnected
24 Unconnected
25 Unconnected
1
Comite Consultatif International Telegraphique et Telephonique, an international consultative
committee that sets international communications standards
2
Electronic Industries Association
C–4 Connector Pin Assignments