Appendix C Host Computer Interface

C.2.Serial (RS-232C/RS-422A) Interface

RS-232C interface

Interface Signals

The pins of the printer’s RS-232C interface connector carry the signals listed in Table C.2. The table also indicates whether each signal is incoming or outgoing with respect to the printer.

Table C.2. RS-232C Signal Pin Assignments

Pin

In/out

Signal

Description

 

 

 

 

1

FG

Frame ground

2

Out

TXD

Transmit Data

3

In

RXD

Receive Data

4

Out

RTS

Request To Send

5

In

CTS

Clear To Send

6

In

DSR

Data Set Ready

7

SG

Signal Ground

11

+5V DC

Reserved

20

Out

DTR

Data Terminal Ready

Brief descriptions of the signals follow.

FG - Frame Ground - (Pin 1)

This pin is connected directly to the printer frame.

TXD - Transmit Data - (Pin 2)

This output carries asynchronous data sent by the printer to the computer. It is used mainly in handshaking protocols.

C-7

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Kyocera FS-6700 manual Serial RS-232C/RS-422A Interface, RS-232C interface, Interface Signals, FG Frame Ground Pin