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Serial (RS-232C/RS-422A) Interface (Option)
C-8
TXD Transmit Data (Pin 2)
This output carries asynchronous data sent by the printer to the computer. It is used mainly in
handshaking protocols.
RXD Receive Data (Pin 3)
This input carries serial asynchronous data sent by the computer to the printer.
RTS Request To Send (Pin 4)
This output is always held high (above 3 volts).
CTS Clear To Send (Pin 5)
DSR Data Set Ready (Pin 6)
Unused.
SG Signal Ground (Pin 7)
All signals can transmit between the printer and the host computer to send each signals with a signal
ground.
DTR Data Terminal Ready (Pin 20)
This output is used as a buffer nearly-full handshake line. It is held high (above 3 volts) when the
buffer can accept more data.
RS-232C Interface Voltage Levels
The voltage levels of the interface signals conform to EIA RS-232C specifications. SPACE is from 3
volts to 15 volts. MARK is from 3 volts to 15 volts. Voltages between 3 volts and 3 volts are
undefined.