Epson SEIJ98006 manual Pin Assignment For Reverse Channel

EPSON Stylus Color 900						Revision C
		Table 1-13. Pin Assignment For Reverse Channel
	Pin No.	Signal Name	Return GND	In/Out	Functional Description
			Pin
	1	HostClk	19	I	Host clock signal.
					The DATA0 through DATA7 signals represent data bits 0 to7,
	2-9	Data0-7	20-27	I	respectively. Each signal is at high level when data is logical 1 and
					low level when data is logical 0. These signals are used to transfer
					the 1284 extensibility request values to the printer.
	10	PrtClk	28	O	Printer clock signal.
	11	PtrBusy, Data Bit-3,7	29	O	Printer busy signal and reverse channel transfer data bit 3 or 7.
	12	AckData Req, DataBit-2,6	28	O	Acknowledge data request signal and reverse channel transfer
					data bit 2 or 6.
	13	Xflag, DataBit-1,5	28	O	X-flag signal and reverse channel transfer data bit 1 or 5.
	14	HostBusy	30	I	Host busy signal.
	31	/INIT	30	I	Not used.
	32	/DataAvail, DataBit-0,4	29	O	Data available signal and reverse channel transfer data bit 0 or 4.
	36	1284-Active	30	I	1284 Active Signal
	18	Logic-H	----	O	Pulled up to +5V via 3.9K ohm resister.
	35	+5V	----	O	Pulled up to +5V via 3.3K ohm resister.
	17	Chassis GND	----	---	Chassis GND.
	16,33, 9-30	GND	----	---	Signal GND.
	15,34	NC	----	---	Not connected.

* In/Out refers to the direction of signal flow from the printer’s point of view.

Product Description Interface 27