Epson Scan 2500 service manual Interfaces, Printer Interface, Parallel

EPSON Stylus Scan 2500 Revision A

1.5 Interfaces

This section is divided into printer and scanner interface specifications. See the following section for printer interface details or see “Scanner interfaces” on pag e22 for scanner interface details.

1.5.1 Printer Interface

PARALLEL

BUSY signal is set high before setting either -ERROR low or PE high, and held high until all these signals return to their inactive state.

BUSY signal is at high level in the following cases:

During data entry (see data transmission timing)

When input data buffer is full

During -INIT signal is at low level or during hardware initialization

During printer error (see -ERROR signal)

When the parallel interface is not selected

ERROR signal is at low level when the printer is in one of the following states:

T	Printer hardware error (fatal error)
	Paper-out error
	Paper-jam error
	Ink-out error

PE signal is at high level during paper-out error.

1. Specification
Transmission mode	8 bit parallel, IEEE-1284 compatibility/nibble mode
Synchronization	Refer to the IEEE-1284 specification
Handshaking	Refer to the IEEE-1284 specification

Packet	Refer to the IEEE-1284 Standard for Data Delivery
	and Logical Channels for IEEE Std. 1284.4 Interface
	(Draft D1.50)
	Refer to the IEEE-1284 specification
Signal level	TTL compatible level (IEEE-1284 Level 1 device)
Data trans. timing	Refer to the IEEE-1284 specification

2.Connector pin assignment and signals Refer to the IEEE-1284 specification

3.Data transmission timing

Refer to the IEEE-1284 specification

4.Extensibility Request:

The printer responds affirmatively when the extensibility request values are 00H or 04H, which mean

	00H	Request nibble mode reverse channel transfer
T	04H	Request Device ID;
		Return data using nibble mode reverse channel transfer

Device ID:

The printer sends the following device ID string when requested.

IEEE 1284.4 is enabled,

[00H][5EH]

MFG:EPSON;

CMD:ESCPL2,BDC,D4,SPC;

MDL:Stylus[SP]Scan[SP]2500;

CLS:PRINTER

DES:EPSON[SP]Stylus[SP]Scan[SP]2500;

Note: (1)[00H] denotes a hexadecimal value of zero (2)MDL value depends on the EEPROM setting.

Product Description Interfaces 19