Ieee-1284 Parallel I/F (Reverse Channel) - Epson Stylus COLOR 670 Service Manual

EPSON Stylus Color 670
Table 1-5. Connector Pin Assignment and Signals (F-Channel)
Pin Signal Return
In/Out
No. Name GND Pin
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
- Chassis GND.
- Signal GND.
- Not connected.

1.3.2 IEEE-1284 Parallel I/F (Reverse Channel)

Reverse channel is used to transfer the information data from the printer
side to the PC side.
Table 1-6. Parallel I/F Specification (R-Channel)
Item
Transmission mode IEEE-1284 nibble mode
Synchronization Comply with the IEEE-1284 specification
Handshaking Comply with the IEEE-1284 specification
Data trans. timing Comply with the IEEE-1284 specification
Signal Level TTL level (IEEE-1284-Level 1 device)
o
Device ID
n
When IEEE-1284.4 protocol is enabled:
[00H] [5AH]
MFG: EPSON;
CMD: ESCPL2, BDC, D4;
MDL: Stylus[SP]COLOR[SP]670;
CLS: PRINTER;
DES: EPSON[SP]Stylus[SP]COLOR[SP]670;
n
When IEEE1284.4 protocol is NOT enabled:
[00H] [57H]
MFG: EPSON;
CMD: ESCPL2, BDC;
MDL: Stylus[SP]COLOR[SP]670;
CLS: PRINTER;
DES: EPSON[SP]Stylus[SP]COLOR[SP]670;
NOTE: [00H] denotes a hexadecimal value of zero.
MDL value depends on the EEPROM setting.
CMD value depends on the IEEE1284.4 setting.
Interface
Revision A
Specification
17