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Synchronous/Asynchronous Communications Port
Synchronous/Asynchronous Communications Port
Synchronous/
Asynchronous
Communication
Port Diagram
Figure B–2 shows the pin layout for the synchronous
/asynchronous communications port.
Figure B–2 Synchronous/Asynchronous Communications Port
1
13
14
25
MLO-008585
Synchronous/
Asynchronous
Communications
Port Pin-outs
Table B–2 describes pin usage for the synchronous/asynchronous
communications port.
Table B–2 Synchronous/Asynchronous Communications Port
Pin-outs
Pin
Source
Signal
CCITT
1
EIA
2
Description
1
GND
102
AB
Signal ground
2
System
TX
103
BA
Modem transmitted
data
3
Modem/printer
RX
104
BB
Modem received data
4
System
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
1
International Telegraph and Telephone Consultative Commiittee (CCITT), an
international consultative committee that sets international communications
standards.
2
Electronic Industries Association
(continued on next page)
Port Pin-outs B–3
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