A-1. Connectors and Signals
RS-232C
Pin no. Signal name
1
F-GND
2
N/C
3
RXD
4
RTS
5-6
N/C
7
S-GND
8-10
N/C
11
RCH
12
N/C
13
GND
14
FAULT
15-19
N/C
20
DTR
21-25
N/C
1
Appendix A: Serial Interface
I/O direction
—
Frame ground
Not connected
IN
Received data
OUT
Data transmission request signal. This is always
"SPACE" when the printer is turned on. (Always
"SPACE" status)
Not connected
—
Signal ground
Not connected
OUT
When the printer is ready to receive data, the signal line
is same as pin 20.
Not connected
—
Signal ground
OUT
When printer error occurs (such as paper out, mechani-
cal error, etc.) this signal changes to "MARK".
Not connected
OUT
Data terminal ready signal. When the printer is ready to
receive data, this signal changes to "SPACE".
Not connected
14
Fig. A-1 Serial interface connector
Function
– 87 –
25
13