Epson 810, 820, 830 1.3.2 Parallel Interface (Reserve Channel), Table 1-14.Connector pin assignment and signals, Table 1-14.Connector pin assignment and signals (continued)

EPSON Stylus PHOTO 810/820/830 Revision B

1.3.2 Parallel Interface (Reserve Channel)

† Transmission Mode			: IEEE-1284 nibble mode
† Adaptable Connector			: See forward channel
† Synchronization			: Refer to the IEEE-1284 specification
† Handshaking			: Refer to the IEEE-1284 specification
† Data Trans. Timing			: Refer to the IEEE-1284 specification
† Signal Level			: IEEE-1284 level 1 device
			See forward channel.
		Table 1-14. Connector pin assignment and signals
	Pin No.	Signal name	Return	In/Out	Functional description
			GND pin
	1	HostClk	19	In	Host clock signal.
	2	DATA0	20	In
	3	DATA1	21	In	The DATA0 through DATA7 signals
	4	DATA2	22	In	represent data bits 0 to 7, respectively.
					Each signal is at high level when data is
	5	DATA3	23	In
					logical 1 and low level when data is
					logical 0.
	6	DATA4	24	In
					These signals are used to transfer the
	7	DATA5	25	In
					1284 extensibility request values to the
					printer.
	8	DATA6	26	In
	9	DATA7	27	In
	10	PtrClk	28	Out	Printer clock signal.
	11	PtrBusy /	29	Out	Printer busy signal and reverse channel
		DataBit-3,7			transfer data bit 3 or 7.
	12	AckDataReq	28	Out	Acknowledge data request signal and
		/ DataBit-2,6			reverse channel transfer data bit 2 or 6.
	13	Xflag /	28	Out	X-flag signal and reverse channel
		DataBit-1,5			transfer data bit 1 or 5.
	14	HostBusy	30	In	Host busy signal.

Table 1-14. Connector pin assignment and signals (continued)

Pin No.	Signal name	Return	In/Out	Functional description
		GND pin
31	-INIT	30	In	Not used.
32	-DataAvail /	29	Out	Data available signal and reverse channel
	DataBit-0,4			transfer data bit 0 or 4.
36	1284-Active	30	In	1284 active signal.
18	Logic-H	-	Out	Pulled up to +5V via 3.9K ohm resistor.
35	+5V	-	Out	Pulled up to +5V via 3.3K ohm resistor.
17	Chassis GND	-	-	Chassis GND.
16,33,	GND	-	-	Signal GND.
19-30
15,34	NC	-	-	Not connected.

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

†Extensibility Request:

The printer responds affirmatively when the extensibility request values are 00H or 04H, that means,

00H : Request nibble mode reverse channel transfer.

04H : Request device ID;

Return data using nibble mode rev channel transfer.

PRODUCT DESCRIPTION INTERFACE 20