Epson Photo750 manual Parallel InterfaceReverse channel

EPSON Stylus Photo 750 Revision A

Pin.	Signal	Return	In/Out	Function Description
No	Name	GND pin
18	Logic H	---	Out	Pulled up to +5V via 3.9K ohm resistor.
35	+5V	---	Out	Pulled up to +5V via 3.3 K ohm resistor.
17	Chassis	---	---	Chassis GND.
	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.

1.3.2 Parallel Interface(Reverse channel)

Reverse channel is used to transfer the information data from the printer side to the PC side.

Table 1-8. Connector pin assignment and signals

Item	Specification
Transmission mode	IEEE-1284 nibble mode
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	TTL compatible level
Adaptable connector	57-30360(amphenol) or equivalent

†Extensibility request: The printer responds affirmatively when the extensibility request values are 00H or 04H, that mean,

00H: Request Nibble Mode Reverse Channel Transfer.

04H: Request Device ID;

Return Data Using Nibble Mode Rev Channel Transfer

†Device ID: The printer sends following device ID string when it is requested.

„When IEEE1284.4 protocol is effective: [00H] [57H]

MFG:EPSON;

CMD:ESCPL2,BDC,D4;

MDL:Stylus[SP]Photo[SP]750;

CLS:PRINTER;

DES:EPSON[SP]Stylus[SP]Photo[SP]750;

Product Description Parallel Interface 15