22
Optional serial interface pins and signal names
13
25
Pin
Signal
Direction
No.
Name
1
FG
—
2
TXD
OUT
3
RXD
IN
4
RTS
OUT
6
DSR
IN
7
SG
—
20
DTR
OUT
25
INIT
IN
Frame Ground
Transmission data
Receive data
Data terminal ready signal. This signal changes to SPACE when the printer is ready to
receive data.
Signal line that indicates if the host computer can receive data.
SPACE: host can receive
MARK: host cannot receive
The status of this signal is not confirmed.
This signal can be specified as an internal reset signal using of DIP Switch 7 (page 21).
MARK of 1ms or longer activates the reset.
Signal ground
Same as RTS (Pin 4).
This signal can be specified as an internal reset signal using of DIP Switch 8 (page 21).
SPACE of 1ms or longer activates the reset.
Function
1
14