Star Micronics SP300 Benutzerhandbuch

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14

1

25

13

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 al-
ways “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 optional
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 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 optional
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 optional
interface board.