3. connectors and signals – Star Micronics SP300 Series User Manual
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2-3. Connectors and Signals
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.
Fig. 2-4 Serial interface connector