3Com CS/2500 manual Transceiver

A-4 APPENDIX A: PIN ASSIGNMENTS

DCE

CS/2500 Pin

13	TXD+
14	TXD-
16	RXD-
19	RXD+
22
25

Figure A-3 Cable Wiring for Serial Port in Automatic RS-422 Selection Mode

Transceiver	Figure A-4 shows pin numbering for the transceiver connector.
Connector	Table A-2 lists pin assignments for this connector.
	1	2	3	4	5	6	7	8
	•	•	•	•	•	•	•	•
	•	•	•	•	•		•	•
	9	10	11	12	13		14	15
	Figure A-4 Transceiver Connector Pin Numbers
	Table A-2		Transceiver Connector Pin Assignments

Pin	Function	Circuit	Use
1	Control In Shield	CI-S	Control In circuit shield
2	Collision Presence (+)	CI-A	Control In circuit A
3	Transmit (+)	DO-A	Data Out circuit A
4*	Receive Shield	DI-S	Data In circuit shield
5	Receive (+)	DI-A	Data In circuit A
6	Power Return	VC	Voltage common
7	Control Out (+) (unsupported)	CO-A	Control Out circuit A
8*	Control Out Shield	CO-S	Control Out circuit shield
9	Collision Presence (-)	CI-B	Control In circuit B
10	Transmit (-)	DO-B	Data Out circuit B

(continued)