Appendix, Connectors and signals (serial interface), Connectors and signals (serial interface) rs-232c – Star Micronics SP342F-A User Manual
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Serial interface connector
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.
APPENDIX