Computer Interface
4-6
Serial Interface (Option)
Installing the optional serial interface board kit (IB-11) in the printer enables connection to a
computer with an RS-232C standard serial interface.
Interface Signals
The table below shows the pins and corresponding input and output signals of the RS-232C
interface connector.
Interface voltage levels
The voltage levels of the interface signals conform to EIA RS-232C specifications. The voltage level
of SPACE is 3 to 15 volts. The voltage level of MARK is -3 to -15 volts. Voltages between -3 and 3
volts are undefined.
Pin In or out Signal Description
1 — FG Frame Ground. This pin is connected directly to the printer
frame.
2 Out TXD Transmit Data. This pin is used to output asynchronous data
sent from the printer to the computer. This signal is often
used in handshaking.
3 In RXD Receive Data. This pin is used to input serial asynchronous
data sent from the computer to the printer.
4 Out RTS Request To Send. This output is always high (above 3
volts).
5 In CTS Clear To Send. Not used.
6 In DSR Data Set Ready. Not used.
7 — SG Signal Ground. This pin is used to establish a common
reference level for the voltages of all signals other than
Frame Ground.
20 Out DTR Data Terminal Ready. This pin is used to notify the status of
the printer buffer (i.e., nearly full or nearly empty) when
handshaking is used. The pin goes high (above 3 volts)
when the buffer is able to accept more data.
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