Serial Interface (Option)
B-7
B.3 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.
B.3.1 RS-232C Interface
Interface Signals
The pins of the printer’s RS-232C interface connector carry the signals
listed in Table B-3. The table also indicates whether each signal is
incoming or outgoing with respect to the printer.
Brief descriptions of the signals follow.
FG - Frame Ground - (Pin 1)
This pin is connected directly to the printer frame.
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.
Pin In/out Signal Description
1 - FG Frame ground
2 Out TXD Transmit Data
3InRXDReceive Data
4 Out RTS Request To Send
5InCTSClear To Send
6 In DSR Data Set Ready
7 - SG Signal Ground
20 Out DTR Data Terminal Ready
Table B-3
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