KYOCERA FS-3700 User Manual download pdf (Page 105)

C.2. 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

2OutTXD

Transmit Data

3InRXD

Receive Data

4OutRTS

Request To Send

5InCTS

Clear To Send

6InDSR

Data Set Ready

7–SG

Signal Ground

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.

RXD – Receive Data – (Pin 3)

This input carries serial asynchronous data sent by the computer to the printer.

RTS – Request To Send – (Pin 4)

This output is always held high (above 3 volts).

CTS – Clear To Send – (Pin 5)

DSR – Data Set Ready – (Pin 6)

Unused.

SG – Signal Ground – (Pin 7)

All signals can transmit between the printer and the host computer to send each signals with

a signal ground.

DTR – Data Terminal Ready – (Pin 20)

This output is used as a buffer nearly-full handshake line. It is held high (above 3 volts) when

the buffer can accept more data.

C.2. RS-232C/RS-422A Interface

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KYOCERA FS-3700 User Manual Page 105

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