Epson MX-70 Appendix J, Pinout Chart

APPENDIX J

Appendix J

Pinout Chart

The MX-70 includes a parallel interface as the standard equipment, and this paragraph describes the parallel interface.

(1)Specifications

(a)Data transfer rate: 1000 CPS (max.)

(b)Synchronization: By externally supplied STROBE pulses.

(cl	Handshaking:	By ACKNLG or BUSY signals.
(d)	Logic level:	Input data and all interface control signals are
		compatible with the TTL level.

(2)Connector

Plug: 57-30360 (AMPHENOL)

It is recommended that interface cables be kept as short as possible

(3)Connector pin assignment and descriptions of signals

Connector pin assignment and descriptions of respective interface signals are provided in Table 7.

Table 7 Connector Pin Assignment and Descriptions of Interface Signals

Signal

Return

Signal

Direction

Description

Pin No.

Pin No.

1

1 9

STORAGE

I n

STROBE pulse

to read data In Pulse width

must be more than 0.5µs at receiving

terminal The signal level IS normally

“HIGH”. read-In of

dataIS performed at

the transit

to “LOW” level of thus

signal

2

20

DATA 1

In

These

signals

represent information

of the

1st to

8th

bits

of

parallel

data

respectively

3

21

DATA

2

In

Each signal

IS at

“HIGH”

level

when data

IS logical “1”

and

“LOW” when

logical

4

22

DATA 3

In

“0”

5

23

DATA 4

In

The logical

state

of

each

data must be

held as IS until

the

BUSY

signal

comes

6

24

DATA 5

In

“LOW” level

again.

7

25

DATA

6

In

8

26

DATA

7

In

9

27

DATA

8

In

out

Approx

5µs

pulse

“LOW” Indicates that

10

28

ACKNLG

data has been received and that the

printer

IS ready

to

accept

other

data

A “HIGH” signal indicates that the printer

cannot receive data The signal becomes

“HIGH” in the following cases’

1

During

data

entry.

2

During

printing

operation.

3

During

paper

feed

4

During

printer

error status

101