Parallel Interface(Reverse Channel) - Epson Stylus Photo 750 Service Manual

EPSON Stylus Photo 750
Pin. Signal Return
In/Out
No Name GND pin
18 Logic H ---
35 +5V ---
Chassis
17 ---
GND
16,33
GND ---
19-30
15,34 NC ---
NOTE: In/Out refers to the direction of signal flow from the printer's
point of view.
Product Description
Function Description
Out Pulled up to +5V via 3.9K ohm resistor.
Out Pulled up to +5V via 3.3 K ohm resistor.
--- Chassis GND.
--- Signal GND.
--- Not connected.

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
Transmission mode
Synchronization
Handshaking
Data trans.timing
Signal Level
Adaptable connector
† 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;
Parallel Interface
Specification
IEEE-1284 nibble mode
Refer to the IEEE-1284 specification
Refer to the IEEE-1284 specification
Refer to the IEEE-1284 specification
TTL compatible level
57-30360(amphenol) or equivalent
Revision A
15