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Table 61. EIA-232/X.21bis communications adapter cable (continued)
Signal designation
Interchange circuit
number
Adapter connector pin
number
DCE connector pin
number
Calling indicator 125 27 22
Cable ID 1, 4 common return 102 (17, 33, 7) 7
Notes:
1
Cable ID 1, 4 is connected to common return pin 7 only at the DTE connector end and is not connected at
the DCE end.
2
The Select Standby signal (circuit 116) is not used on all EIA-232/X.21bis Communication Adapter cables.
EIA-232/X.21bis communications adapter cable
Table 62. EIA-232/X.21bis communications adapter cable
Signal designation
Interchange circuit
number
Adapter connector pin
number
DCE connector pin
number
Transmitted data 103 2 2
Received data 104 3 3
Request to send (RTS) 105 4 4
Ready for sending (CTS) 106 5 5
Data set ready (DSR) 107 6 6
Data terminal ready/connect data set
to line
108/2 20 20
Received line signal (carrier) detector 109 8 8
Data signal rate selector 111 23 23
Transmitter signal element timing
(DTE)
113 24 24
Transmitter signal element timing
(DCE)
114 15 15
Receiver signal element timing
(DCE)
115 17 17
Select standby
2
116 11 11
Calling indicator 125 22 22
Cable ID 0, 3 common return 102 (1, 7, 13) 7
Notes:
1
Cable ID 0, 3 is connected to common return pin 7 only at the DTE connector end and is not connected at
the DCE end.
2
The Select Standby signal (circuit 116) is not used on all V-24 Communication Adapter cable assemblies.
EIA-232/X.21bis cable wrap connector wiring
Table 63. EIA-232/X.21bis cable wrap connector wiring
Signal designation Wrap connector pin to pin
Transmit data to receive data 2 to 3
RTStoCTS 4to5
DTR to DSR, calling indicator 20 to 6, 22
Chapter 9. System Architecture and Configuration 255