Interface pin assignments, Dte connector - eia rs-232-c, Telco connector – Telenetics MOT202TRM User Manual
Page 31: Nterface, Ssignments, Dte connector - eia rs-232-c telco connector
Interface Pin Assignments
Page 29
Interface Pin Assignments
DTE Connector - EIA RS-232-C
Pin
RS-232C Circuit
CCITT V.24 Circuit
Function
1 AA
101
Protective
Ground
2 BA
103
Transmitter
Data
3 BB
104
Receive
Data
4
CA
105
Request to Send
5
CB
106
Clear to Send
6
CC
107
Data Set Ready
7 AB
102
Signal
Ground
8
CF
109
Data Carrier Detect
9
+12 Volts Test Only
10
-12 Volts Test Only
25
Analog Loopback
Note:
All interfaces on the RS-232-C digital connector conform to
the requirements of EIA-RS-232-C.
Telco Connector
Pin
Description
4, 5
2-wire mode: transmit/receive pair.
4-wire mode: transmit pair.
3, 6
Receive pair for 4-wire mode.
Polarity of transmit pair or receive pair is not significant. Remaining
pins are not used.