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GENERAL DESCRIPTION
Rev. B
1-
21
1.3.2 Parallel Interface (Reverse channel)
Data transmission mode: IEEE-1284 nibble mode
Connector type: 57-30360 (AMPHENOL) 36-pin plug or equivalent
Synchronization: No Info.
Handshaking: No info.
Data transmission timing: No info.
Signal Level: TTL-level compatible, IEEE-1284 level 1 device
Extensibility request : 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
Device ID :
[00h][3Ah]
MPG:EPSON;
CMD:ESCP9,PRPII9,BDC;
MDL:DFX-8500;
CLS:PRINTER;
Connector pin assignments: Refer to Table 1-11.
Table 1-11. Signal and Connector Pin Assignment (Reverse channel)
Pin No. Signal Name I/O* Description
1 /STROBE IN HostCIk: This signal is a strobe pulse used to read extension
request values from the host computer during negotiation.
2-9 DATA 1-8 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
10 /ACKNLG OUT PtrCIk: Printer data sending clock.
11 BUSY OUT PtrBusy: Printer sending data bits 3 and 7 during data transfer to
the host computer
12 PE OUT AckDataReq: Printer sending data bits 2 and 6 during data transfer
to the host computer
13 SLCT OUT Xflag: Printer sending data bits 2 and 6 during data transfer to the
host computer.
14 /AUTO-FEED IN HostBusy: This signal informs the printer of the host computer
state. When the signal is HIGH, the host computer cannot accept
data.
15 NC - Not used.
16 GND - Logic ground level
17 CHASSISGND - Connected to the printer chassis. The printer chassis GND and the
signal GND are connected to each other.
18 NC - Not connected.
19-30 GND - Ground level for the twisted pair return signal.
31 /INIT IN nlnit: High level fixed
32 /ERROR OUT nDataAvaiI: Printer sending data bits 0 and 4 during data transfer to
the host computer.
33 GND - Same as for ins19to30.
34 NC - Not used.
35 +5 - Pulled up to +5V through 1.0K ohm resistor.
36 /SLCT IN IN 1284Active: If this signal is set to HIGH, this printer active
P1284(reverse mode).
Note: * In/Out refers to the direction of signal flow from the printer’s point of view.