Serial Interface (Option)
B-6
Serial Interface (Option)
Installing the option serial interface board kit (IB-11) in the printer
enables connection to a computer with an RS-232C standard serial
interface.
RS-232C Interface
Interface Signals
The pins of the printer’s RS-232C interface connector carry the signals
listed in table below. 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-4
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