IBM SY44-5902-05 manual EIA-232/X.21bis communications adapter cable

Table 61. EIA-232/X.21bis communications adapter cable (continued)

	Interchange circuit	Adapter connector pin	DCE connector pin
Signal designation	number	number	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

	Interchange circuit	Adapter connector pin	DCE connector pin
Signal designation	number	number	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	108/2	20	20
to line
Received line signal (carrier) detector	109	8	8
Data signal rate selector	111	23	23
Transmitter signal element timing	113	24	24
(DTE)
Transmitter signal element timing	114	15	15
(DCE)
Receiver signal element timing	115	17	17
(DCE)
Select standby2	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
RTS to CTS	4 to 5
DTR to DSR, calling indicator	20 to 6, 22

Chapter 9. System Architecture and Configuration 255