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Interface Pin Assignments
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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.