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Serial Interface (Option)
C.2
Serial Interface (Option)
C.2.1 RS-232C Interface
Installing the optional serial interface kit (IB-10E) in the printer enables
connection to a computer with an RS-232C or RS-422A standard serial
interface.
Interface Signals
The pins of the printer's RS-232C interface connector carry the
signals listed in
Table C.
signal is incoming or outgoing with respect to the printer.
Table C.2 RS-232C Signal Pin Assignments
Pin
In/out
1
2
3
4
5
6
7
20
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).
2. The table also indicates whether each
Signal
-
FG
Out
TXD
In
RXD
Out
RTS
In
CTS
In
DSR
-
SG
Out
DTR
C-6
Description
Frame ground
Transmit Data
Receive Data
Request To Send
Clear To Send
Data Set Ready
Signal Ground
Data Terminal Ready
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