Parallel Interface (Reverse Channel) - Epson DFX-8500 Service Manual

1.3.2 Parallel Interface (Reverse channel)

‰
Data transmission mode:
‰
Connector type:
‰
Synchronization:
‰
Handshaking:
‰
Data transmission timing:
‰
Signal Level:
‰
Extensibility request :
‰
Device ID :
‰Connector pin assignments:
Table 1-11. Signal and Connector Pin Assignment (Reverse channel)
Pin No. Signal Name
1 /STROBE
2-9 DATA 1-8
10 /ACKNLG
11 BUSY
12 PE
13 SLCT
14 /AUTO-FEED
15 NC
16 GND
17 CHASSISGND
18 NC
19-30 GND
31 /INIT
32 /ERROR
33 GND
34 NC
35 +5
36 /SLCT IN
Note: * In/Out refers to the direction of signal flow from the printer's point of view.
Rev. B
IEEE-1284 nibble mode
57-30360 (AMPHENOL) 36-pin plug or equivalent
No Info.
No info.
No info.
TTL-level compatible, IEEE-1284 level 1 device
The printer responds to the extensibility request in the affirmative,
when the request is 00h or 04h, which mean:
00h : Request nibble mode of reverse channel transfer
04h : Request device ID in nibble mode of reverse channel transfer
[00h][3Ah]
MPG:EPSON;
CMD:ESCP9,PRPII9,BDC;
MDL:DFX-8500;
CLS:PRINTER;
Refer to Table 1-11.
I/O* Description
IN HostCIk: This signal is a strobe pulse used to read extension
request values from the host computer during negotiation.
IN The signals are data bits of extension request Values during
negotiation. This printer supports following values:
0000 0100: Request Device ID (by nibble mode sending)
0000 0000: Request nibble mode
OUT PtrCIk: Printer data sending clock.
OUT PtrBusy: Printer sending data bits 3 and 7 during data transfer to
the host computer
OUT AckDataReq: Printer sending data bits 2 and 6 during data transfer
to the host computer
OUT Xflag: Printer sending data bits 2 and 6 during data transfer to the
host computer.
IN HostBusy: This signal informs the printer of the host computer
state. When the signal is HIGH, the host computer cannot accept
data.
- Not used.
- Logic ground level
- Connected to the printer chassis. The printer chassis GND and the
signal GND are connected to each other.
- Not connected.
- Ground level for the twisted pair return signal.
IN nlnit: High level fixed
OUT nDataAvaiI: Printer sending data bits 0 and 4 during data transfer to
the host computer.
- Same as for ins19to30.
- Not used.
- Pulled up to +5V through 1.0K ohm resistor.
IN 1284Active: If this signal is set to HIGH, this printer active
P1284(reverse mode).
GENERAL DESCRIPTION
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