C-6
FS-1800/N | FS-3800/N
Serial interface
The printer is equipped with a serial interface connector. The device responsible for controlling the
serial interface is integrated in the gate array in the controller system. The serial interface supports
protocol of RS-232C. A 25-pin D-sub connector is used for the serial interface.
RS-232C interface voltage levels
The voltage levels of the RS-232C signals conform to EIA RS-232C specifications. FALSE is from
3 volts to 15 volts. TRUE is from -3 volts to -15 volts. Voltages between -3 volts and 3 volts are
undefined.
Connector configurations
The printer uses a DB-25 connector for the serial interface. Depending on the computer configurations
for serial interface, use either of the appropriate configurations.
Signal Meaning
FG (Pin 1) This pin is connected directly to the printer frame.
TxD (Pin 2) This output carries asynchronous data sent by the printer to the computer.
It is used mainly in handshaking protocols.
RxD (Pin 3) This input carries serial asynchronous data sent by the computer to the
printer.
RTS (Pin 4) This output is always held high (above 3 V).
CTS (Pin 5) Unused.
DSR (Pin 6) Unused.
SG (Pin 7) All signals can transmit between the printer and the host computer to send
each signals with a signal ground.
+5V (Pin 12) Power supply for barcode reader. (Maximum 500 mA)
DTR (Pin 20) This output is used as a buffer nearly-full handshake line. It is held high
(above 3 V) when the buffer can accept more data.
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