Citizen iDP3221 manual Connector Pin Assignment, Gnd, Dkstatus

iDP3221 User’s Manual

6.1.3 Connector Pin Assignment				NC: Non connection
	Pin No.	Source	Compatibility Mode	Nibble Mode	Byte Mode
	1	Host	nStrobe	HostClk	HostClk
	2	Host/Printer	Data0(LSB)	Data0(LSB)	Data0(LSB)
	3	Host/Printer	Data1	Data1	Data1
	4	Host/Printer	Data2	Data2	Data2
	5	Host/Printer	Data3	Data3	Data3
	6	Host/Printer	Data4	Data4	Data4
	7	Host/Printer	Data5	Data5	Data5
	8	Host/Printer	Data6	Data6	Data6
	9	Host/Printer	Data7(MSB)	Data7(MSB)	Data7(MSB)
	10	Printer	nAck	PtrClk	PtrClk
	11	Printer	Busy	PtrBusy/Data3.7	PtrBusy
	12	Printer	PError	AckDataReq/Data2.6	AckDataReq
	13	Printer	Select	XFlag/Data1.5	XFlag
	14	Host	nAutoFd	HostBusy	HostBusy
	15		(NC)	(Undefined)	(Undefined)
	16		GND	GND	GND
	17		FG	FG	FG
	18	Printer	Logic-H	Logic-H	Logic-H
	19		GND	GND	GND
	20		GND	GND	GND
	21		GND	GND	GND
	22		GND	GND	GND
	23		GND	GND	GND
	24		GND	GND	GND
	25		GND	GND	GND
	26		GND	GND	GND
	27		GND	GND	GND
	28		GND	GND	GND
	29		GND	GND	GND
	30		GND	GND	GND
	31	Host	nInit	nInit	nInit
	32	Printer	nFault	nDataAvail/Data0.4	nDataAvail
	33		GND	(Undefined)	(Undefined)
	34	Printer	DK_STATUS	(Undefined)	(Undefined)
	35	Printer	+5V	(Undefined)	(Undefined)
	36	Host	nSelectIn	IEEE 1284 Active	IEEE 1284 Active

•"n" before the signal indicates that it is "L" active.

•Bi-directional communication is impossible if any one of the above signals is absent.

•Always use twisted-pair cables for signal lines, and connect return lines to signal ground.

•Ensure that the interface employs TTL level signals with the following mentioned characteristics, and that signal rise and fall times are 0.5 µ sec.

•Ignoring nAck and Busy signals while transferring data may result in loss of data.

•Ensure that the interface cable is of the minimum length possible.

24 CITIZEN