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C-8
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.
+5V DC - (Pin 11)
This line is connected to the printer’s +5V DC line (+5V ±0.5V, 250 mA [Parallel and Serial total]
maximum, fused).
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.
C.2. Serial (RS-232C/RS-422A) Interface