RAD Data comm ASMI-450 operation manual A.3 X.21 DCE Connector, Designation, Direction, Function

Connector Wiring

A.3 X.21 DCE Connector

When the ASMi-450 is ordered with an X.21 interface, the physical interface is

a15-pin female D-type connector wired in accordance with Table A-4. Table A-4. DCE Connector, X.21 Interface

Pin	Designation	Direction	Function
1	FG	↔	Frame Ground
2	TA	To ASMi-450	Transmit Data - wire A
3	CA	To ASMi-450	Control - wire A
4	RA	From ASMi-450	Receive Data - wire A
5	IA	From ASMi-450	Indication Data - wire A
6	SA	From ASMi-450	Signal Timing - wire A
7	BA	To ASMi-450	External Timing - wire A
8	G	↔	Signal Ground
9	TB	To ASMi-450	Transmit Data - wire B
10	CB	To ASMi-450	Control - wire B
11	RB	From ASMi-450	Receive Data - wire B
12	IB	From ASMi-450	Indication Data - wire B
13	SB	From ASMi-450	Signal Timing - wire B
14	BB	To ASMi-450	External Timing - wire B
15	–	N/A	Not Connected

A-4 ASMi-450 Installation and Operation Manual