Parallel Interface Reverse channel

□ Data transmission mode:

□ Synchronization:

□ Data transmission timing:

□ Extensibility request :

Device ID :

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;_

□ 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.

Note: * In/Out refers to the direction of signal flow from the printer's point of view.

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