- Printer Owner's Guide

Synchronous/Asynchronous Communications Port
Table B–2 (Cont.) Synchronous/Asynchronous
Communications Port Pin-outs
Pin Source Signal CCITT
1
EIA
2
Description
9 Not used
10 Not used
11 Not used
12 Not used
13 Not used
14 Not used
15 Not used
16 Not used
17 Not used
18 Not used
19 Not used
20 System DTR 108.2 CD Data terminal ready
21 Not used
22 Modem/printer RI 125 CE Ring indicator
23 Not used
24 Not used
25 Not used
1
International Telegraph and Telephone Consultative Committee (CCITT), an
international committee that sets international communications standards.
2
Electronic Industries Association
B–4 Port Pin-outs