Oki 6ex, 6E specifications Table of parallel I/F signals, Ecp

3)Table of parallel I/F signals

Pin No.	Signal Name	Signal Direction	Logic	Compatible	Nibble		ECP	Functions
1	Data Strobe	→ Printer	Negative	nStrobe	Host Clk		HostClk	Data strobe
2-9	Data Bit n	↔ Printer	Positive		Data 1(LSB) ~ 8(MSB)			Data line from/to host
10	Acknowledge	Printer →	Negative	nAck	PtrClk		PeriphClk	Completion of reception or function
11	Busy	Printer →	Positive	Busy	PtrBusy		PeriphAck	Data reception not possible
12	Paper End	Printer →	Positive	PError	AckDataReq		nAckReverse	No paper
13	Select	Printer →	Positive	Select	Xllag		Xflag	On-line
14	Auto Feed	→ Printer	Negative	nAutoFd	HostBusy		HostAck	Mode switch request
15	—	—	—			Not definend		Not used
16	0V	—	—			Logic Gnd		Signal groud
17	Chassis Groud	—	—			Chassis Gnd		Frame ground
18	5V	Printer →	—		Peripheral Logic High			Power supply (max. 50mA)
19	0V	—	—		Signal Ground (nStrobe)			Signal ground
20-27	0V	—	—		Signal Ground (Data 1~ 8)			Signal groud
28	0V	—	—		Signal Ground (PError, Select, nAck)			Signal Groud
29	0V	—	—		Signal Ground (Busy, nFault)			Signal groud
30	0V	—	—		Signal Ground (nAutoFd, nSelectln, nlnit)			Signal groud
31	Input Prime	→ Printer	Negative	nlnit	nlnit		nReverseRequest	Initialize
32	Fault	Printer →	Negative	nFault	nDataAvail		nPeriphRequest	Error occurrrence, On-line
33	0V	—	—			Not Defined		Signal groud
34	—	—	—			Not Defined		Not used
35	—	Printer →	—			Not Defined		Fixed to logic "1"
36	Select In	→ Printer	Negative	nSelectln	1284 Active		1284 Active	Mode switch request

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