Interface Specifications

Handshaking

Handshaking by DTR signal or X-on/X-off. The DTR signal changes to mark-meaning the printer is not ready to receive data-when the number of bytes free in the input buffer goes down to 256. The signal changes to space-meaning that the printer is now ready-when the number of bytes free in the input buffer rises to 528.

Error handling

All errors are ignored.

Connector

6-pin DIN connector.

In this table, the direction of signals is given relative to the printer.

Pin number

Signal

 

Signal

Description

 

 

 

 

direction

 

 

 

 

 

 

 

 

1

TXD

 

out

Transmits data for X-on/X-off

 

2

DTR

 

out

Whether or not the printer is ready

 

 

 

 

 

 

to receive data

3

RXD

 

in

Receives data

4

NC

-

Not used

5

SG

Signal ground level

6

FG

-

1Printer chassis ground

 

 

 

 

 

 

 

The pins are arranged as shown below.

8-10