INTERFACE INFORMATION

SERIAL INTERFACE

RS-232C is the standard serial interface for data terminal equipment. The

 

cable connector at the printer side should be a D-subminiature Cannon or

 

Cinch DB-25P male connector or equivalent that conforms to EIA standards.

 

The table that follows shows the pin assignments commonly used by most

 

computers. In the table:

• “Input” denotes a signal from the computer to the printer.

• “Output” denotes a signal from the printer to the computer.

• The signal level for mark state (logical 1) is -3 V or lower; for space

state (logical 0), it is +3 V or higher.

Pin

Signal

Direc-

Description

No.

Name

tion

 

 

 

 

 

1

FG

Frame Ground

2

TD

Output

Transmitted Data. This pin carries information

 

 

 

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-7

Page 209
Image 209
Fujitsu DL3750+/3850+ manual Serial Interface, Rts