Epson DFX-9000 Service Manual page 34

Epson DFX-9000
1.2.8.2 Parallel interface (reverse channel)
Transmission mode: IEEE-1284 nibble mode
Compatible connector: 57-30360 (Amphenol) or equivalent
Synchronization: Refer to the IEEE-1284 specification
Handshaking: Refer to the IEEE-1284 specification
Signal level: TTL compatible (IEEE-1284 level 1 device)
Data transmission timing: Refer to the IEEE-1284 specification
Extensibility request:
The printer responds to the extensibility request in the affirmative
when the request is 00h or 04h:
00h: Request nibble mode of reverse channel transfer
04h: Request device ID in nibble mode of reverse channel
transfer
Pin No. Signal name
1 HostClk
2 DATA1
3 DATA2
4 DATA3
Product Description
Table 1-21. Connector pin assignment, reverse channel
Return GND
In/Out* Function description
Pin
19 In Host clock signal
20 In Parallel input data to the printer
21 In
22 In
Basic specifications
Device ID:
The printer sends the following device ID strings when it is requested.
When IEEE 1284.4 is enabled,
[00h][50h]
MFG:EPSON;
CMD:ESCP9,PRPII9,BDC,D4;
MDL:DFX-9000;
CLS:PRINTER;
DES:EPSON[SP]DFX-9000;
When IEEE 1284.4 is disabled,
[00h][4Dh]
MFG:EPSON;
CMD:ESCP9,PRPII9,BDC;
MDL:DFX-9000;
CLS:PRINTER;
DES:EPSON[SP]DFX-9000;
Revision B
bit 0: LSB
bit 1
bit 2
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