Parallel Interface (Reverse Channel) - Epson Stylus Color 640 Service Manual

EPSON Stylus Color 440/640/740

1.3.2 Parallel Interface (Reverse Channel)

[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] IEEE-1284 level 1 device
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.
Chapter 1 Product Description
NOTE: The printer sends following device ID string when it is requested.
Table 1-11. Details of Device ID
00H 3CH
MGF EPSON;
CMD ESCPL2,BDC;
Stylus[SP]Color[SP] 440;
MDL Stylus[SP]Color[SP] 640;
Stylus[SP]Color[SP] 740;
CLS PRINTER;
NOTE: [00H] denotes a hexadecimal value of zero. MDL value depends on the
EEPROM setting.
NOTE: MDL value depends on the EEPROM setting. Model name can be changed by
changing a certain address in the EEPROM.
Table 1-12 shows pin assignment for reverse channel (*3). In these
case of signals, twist pair line is used and returning side is connected to
Signal GND.
*3: Reverse channel is the mode that any data is transferred from the
printer to the PC.
Revision A
Contents
Production Maker
Command system
Model name
Class
27