Epson 7000 service manual Parallel Interface Nibble Mode, Transmission Specifications

EPSON Stylus Pro 7000 Revision B

1.2.2 Parallel Interface - Nibble Mode

Table 1-17. Transmission Specifications

	Description
Transmission mode	IEEE-1284 nibble mode
Synchronization	Refer to IEEE-1284 specification
Handshaking	Refer to IEEE-1284 specification
Signal level	TTL compatible (IEEE-1284 level 1 device)
Adaptable	57-30360 (Amphenol) or equivalent
connector
Data trans. timing	Refer to IEEE-1284 specification
	The printer responds affirmatively when the extensibility
	request values are 00H or 04H:
Extensibility request	00H: Request Nibble Mode Reverse Channel Transfer
	04H: Request Device ID;
	Return Data Using Nibble Mode Reverse Channel
	Transfer
	The printer returns the following strings when the device ID
	is requested:
	<00H><4EH>
	MFG: EPSON
Device ID	CMD: ESCPL2, BDC
	MDL: Stylus[SP]Pro[SP]7000
	CLS: PRINTER
	DES: EPSON[SP]Stylus[SP]Pro{SP]7000
	Note: [00H] denotes a hexadecimal value of zero
	MDL values depend on the EEPROM setting

Table 1-18. Connector Pin Assignments - Reverse Channel

Pin	Signal Name	Return	In/	Functional Description
No.		Pin	Out
1	HostClk	19	I	Host clock signal.
				The DATA0 through DATA7 signals
				represent data bits 0 to7, respectively.
2-9	Data0-7	20-27	I	Each signal is at high level when data is
				logical 1 and low level when data is logical
				0.
10	PtrClk	28	O	Printer clock signal
11	PtrBusy/	29	O	Printer busy signal and reverse channel
	DataBit-3,7			transfer data bit 3 or 7.
12	AckDataReq/	28	O	Acknowledge data request signal and
	DataBit-2,6			reverse channel transfer data bit 2 or 6.
13	Xflag/	28	O	X-flag signal and reverse channel transfer
	DataBit-1,5			data bit 1 or 5.
14	HostBusy	30	I	Host busy signal.
15	NC			Not connected
16	GND			Signal ground
17	Chassis GND			Chassis ground
18	Logic-H		O	Pulled up to +5V via 3.9K ohm resister.
19-30	GND			Ground for twisted pair return
31	-INIT	30	I	Not used.
32	-DataAvail/	29	O	Data available signal and reverse channel
	DataBit-0,4			transfer data bit 0 or 4.
33	GND			Signal ground
34	NC			Not connected
35	+5V	----	O	Pulled up to +5V via 1.0K ohm resister.
36	1284-Active	30	I	1284 Active Signal

Note: In (I) and Out (O) refer to the direction of signal flow from the printer’s point of view.

Product Description Interfaces 26