Star Micronics 347F Benutzerhandbuch

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APPENDIX

Connectors and Signals (Serial Interface)
RS-232C

Pin no.

Signal name

I/O

Function

direction

1

F-GND

—

Frame ground

2

TXD

OUT

Transmitted data

3

RXD

IN

Received data

4

RTS

OUT

Data transmission request signal. This
is always “SPACE” when the printer is
turned on.

5

CTS

IN

This signal changes to “SPACE” when
host computer is ready to transmit data.
(In this instance, the printer does not
check this signal.)

6

N/C

Not connected

7

S-GND

—

Signal ground

8

N/C

Not connected

9-10

N/C

This pin is used when using the op-
tional interface board.

11

RCH

OUT

This signal changes to “SPACE” when
the printer is ready to receive data. (The
signal line is same as pin 20.)

12

N/C

Not connected.

13

S-GND

—

Signal ground

14

FAULT

OUT

When a printer error occurs (such as
paper out, mechanical error, etc.), this
signal is set to “MARK”.

15

Multi-printer TXD

OUT

Diode coupled TXD

16

Multi-printer DTR

OUT

Diode coupled DTR

17 to 19

N/C

This pin is used when using the op-
tional interface board.

20

DTR

OUT

Data terminal ready signal. When the
printer is ready to receive data, this
signal changes to “SPACE”.

21-22

N/C

Not connected

23 to 25

N/C

This pin is used when using the op-
tional interface board.