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4. Parallel Interface

4-1. General Specifications

Item Specifications

Interface Centronics-compatible

Synchronization System Via externally supplied STROBE pulse

I/F Protocol Using ACK and BUSY signals

Logic Level Compatible with TTL level

ACK

Data

STROBE

(EDS B-6 : ON)

STROBE

(EDS B-6 : OFF)

BUSY

4.1µs

t : More than 0.5µs

4.1µs

tttt

These signals represent information for the 1st through 8th bit of

parallel data, respectively. Each signal is HIGH when data is logical 1,

and LOW when logical 0.

Fig. 1-6 Timing Charts for Parallel Interface

4-2. Connector Signals

Pin Name Function

1 STROBE Goes low for ≥ 0.5µs when active.

2 DATA0

3 DATA1

4 DATA2

5 DATA3

6 DATA4

7 DATA5

8 DATA6

9 DATA7

10 ACK 10µs low to acknowledge receipt of data.

11 BUSY Printer sets line low when ready to receive data.

12 PAPER High when paper runs out.

13 SELECT High when printer is on-line.

14 AFXT Printer ignores this signal.

15 Not used.

16 SIGNAL GND Signal ground

17 CHASSIS Chassis ground (isolated from signal ground)

18 +5V +5V DC output from printer

19~30 GND Twisted pair ground return

31 RESET Printer is reset when this signal goes low.

32 ERROR Low when printing cannot continue due to error.

33 EXT GND External ground

34~35 Not used

36 SELECT IN Printer ignores this signal.

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 107 108

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Epson LC-7211 Especificaciones Pagina 13

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