Epson MX-70 Manual Do Utilizador

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

Pin No.

Pin No.

Signal

Direction

1

1 9

I n

20

DATA 1

In

3

21

DATA 2

In

4

22

DATA 3

In

5

23

DATA 4

In

6

24

DATA 5

In

7

25

DATA 6

In

8

26

DATA 7

In

9

27

DATA 8

In

10

28

ACKNLG

out

Description

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 data 

IS 

performed at

the transit to “LOW” level of thus signal

These signals represent information of the

1st to 8th bits of parallel data respectively

Each signal 

IS 

at “HIGH” level when data

IS 

logical “1” and “LOW” when logical

“ 0 ”

The logical state of each data must be
held as 

IS 

until the BUSY signal comes

“LOW” level again.

Approx 5µs pulse “LOW” Indicates that
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