INTERFACE INFORMATION

Pin

Signal

Direc-

Description

No.

Name

tion

 

 

 

 

 

1

FG

Frame Ground

 

 

 

 

2

TD

Output

Transmitted Data. This pin carries informa-

 

 

 

tion from the printer to the computer.

 

 

 

 

3

RD

Input

Received Data. This pin carries information

 

 

 

from the computer to the printer.

 

 

 

 

4

RTS

Output

Request To Send. Spaces are sent when the

 

 

 

printer is ready to transmit data.

 

 

 

 

5

CTS

Input

Clear To Send. Spaces are sent when the

 

 

 

computer is ready to receive data.

 

 

 

 

6

DSR

Input

Data Set Ready. Spaces are sent when the

 

 

 

computer has been powered on and is ready

 

 

 

to receive or transmit data.

 

 

 

 

7

SG

Signal Ground (common return)

 

 

 

 

8

CD

Input

Carrier Detect. Spaces are sent when the

 

 

 

computer allows the printer to receive data.

 

 

 

 

11

RC

Output

Reverse Channel. This signal is used instead

 

 

 

of the DTR signal in the RC protocol. Spaces

 

 

 

are sent when the printer is ready to receive

 

 

 

or transmit data.

 

 

 

 

20

DTR

Output

Data Terminal Ready. Spaces are sent when

 

 

 

the printer has been powered on and is ready

 

 

 

to receive or transmit data.

 

 

 

 

Interface

User's Manual

D-5