Omega Engineering OMG-COMM8-A DB-25 Connector Pin Assignments, DB-78 Connector Pin Assignments

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Technical Description

DB-25 Connector Pin Assignments

	Signal		Name	Pin #	Mode
	GND		Ground	7
	TD		Transmit Data	2	Output
	RTS		Request To Send	4	Output
	DTR		Data Terminal Ready	20	Output
	RD		Receive Data	3	Input
	CTS		Clear To Send	5	Input
	DSR		Data Set Ready	6	Input
	DCD		Data Carrier Detect	8	Input
	RI		Ring Indicator	22	Input
		Figure 7 - DB-25 Connector Pin Assignments
DB-78 Connector Pin Assignments

Port #	1	2	3	4	5	6	7	8
TD	36	12	27	3	75	51	66	42
RD	37	11	28	2	76	50	67	41
RTS	17	31	8	22	56	70	47	61
CTS	16	32	7	23	55	71	46	62
DTR	35	13	26	4	74	52	65	43
DSR	18	30	9	21	57	69	48	60
DCD	38	10	29	1	77	49	68	40
RI	15	33	6	24	54	72	45	63
GND	34	14	25	5	73	53	64	44

Figure 8 - DB-78 Connector Pin Assignments

Omega Engineering OMG-COMM8-A

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Contents Contents Figures Factory Default Settings IntroductionOverview What’s IncludedPort # DB-25# Address Example Card Setup Address Switch Position SettingAddress Selection DIP-switch Illustration PAL Addressing10 11 12 IRQ SelectionInterrupt Mode Options M N S MM N S M Installation OS/2Features Technical DescriptionInterrupt Status Port DB-25 Connector Pin Assignments DB-78 Connector Pin AssignmentsSignal Name Pin # Mode Port #Environmental Specifications Power ConsumptionPhysical Dimensions ManufacturingAppendix a Troubleshooting Page Appendix B How To Get Assistance Appendix C Electrical Interface RS-232Asynchronous Communications Bit Diagram Appendix D Asynchronous CommunicationsAppendix E 3421 Addendum Appendix F Silk-Screen Appendix G Compliance Notices Warranty Omega Engineering, Incorporated PO BoxTrademarks