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B.3 Serial Interface (Option)
B.3
Serial Interface (Option)
B.3.1
Interface Signals
B.3.2
Interface voltage levels
Installing the optional serial interface board kit (IB-11) in the printer enables connection to a
computer with an RS-232C standard serial interface.
Table B-4
below shows the pins and corresponding input and output signals of the RS-232C
interface connector.
Pin
In or out
Signal
1
—
FG
2
Out
TXD
3
In
RXD
4
Out
RTS
5
In
CTS
6
In
DSR
7
—
SG
20
Out
DTR
Table B-4
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.
Frame Ground. This pin is connected directly to the printer
frame.
Transmit Data. This pin is used to output asynchronous data
sent from the printer to the computer. This signal is often used
in handshaking.
Receive Data. This pin is used to input serial asynchronous
data sent from the computer to the printer.
Request To Send. This output is always high (above 3 volts).
Clear To Send. Not used.
Data Set Ready. Not used.
Signal Ground. This pin is used to establish a common refer-
ence level for the voltages of all signals other than Frame
Ground.
Data Terminal Ready . This pin is used to notify the status of
the printer buffer (i.e., nearly full or nearly empty) when hand-
shaking is used. The pin goes high (above 3 volts) when the
buffer is able to accept more data.
B-6
Description
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