Inferface Specifications

Serial interface pin assignments

The serial interface connector pin assignments and a description of the interface signals are shown in the table below. The direction of signals is given relative to the printer.

Signal

 

 

Pin

Signal

RS-232C

RS-422A

Direction

Description

 

 

1

FG

*

*

 

 

 

Frame ground. Safety

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ground line.

 

 

2

TD

*

 

OUT

Transmit data.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

This pin transmits serial

 

 

 

 

 

 

 

 

 

 

 

data from the printer to

 

 

 

 

 

 

 

 

 

 

 

the computer.

 

 

3

RD

*

(RD-)

 

IN

Receive data.

 

 

 

 

 

 

 

invert

 

 

 

This pin transmits serial

 

 

 

 

 

 

 

 

 

 

 

data from the computer to

 

 

 

 

 

 

 

 

 

 

 

the printer.

 

 

4

RTS

*

 

OUT

Request to send. This pin

 

 

 

 

 

 

 

 

 

 

 

is HIGH when power is on.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5

CTS

*

 

 

IN

Clear to send. This pin

 

 

 

 

 

 

 

 

 

 

 

indicates that the computer

 

 

 

 

 

 

 

 

 

 

 

is ready to receive data

 

 

 

 

 

 

 

 

 

 

 

from the printer.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6

DSR

*

 

 

IN

Data set ready. This pin

 

 

 

 

 

 

 

 

 

 

 

indicates that the computer

 

 

 

 

 

 

 

 

 

 

 

is ready to communicate.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7

SG

*

 

 

 

 

Signal ground. This pin

 

 

 

 

 

 

 

 

 

 

 

provides a ground for all the

 

 

 

 

 

 

 

 

 

 

 

signal lines.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

9

SD

 

(SD-)

OUT

Send data. This

 

 

 

 

 

 

 

invert

 

 

 

pin sends serial data from

 

 

 

 

 

 

 

 

 

 

 

the printer to the computer.

 

 

 

 

 

 

 

 

 

 

 

Signal level is RS-422A.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B-12 Technical Specifications