2012

CTS
Enables Clear To Send handshaking. This monitors pin 5 of a 25-pin serial
port or pin 8 of a 9-pin serial port. CTS is an input bit, monitored for an output
from the plotter or printer.
DSR
Enables Data Set Ready handshaking. This monitors pin 6 of a 25-pin serial
port, or pin 6 of a 9-pin serial port. DSR is an input bit, monitored for an
output from the printer or plotter.
RLSD
Enables Received Line Signal Detector handshaking. This is sometimes called
DCD or Data Carrier Detect. It is an input pin that can be monitored for an
output from the plotter. It is on pin 8 of a 25-pin serial port and on pin 1 of
a 9-pin serial port.
RTS
Controls the Request To Send output bit. This sends a signal to the printer or
plotter on pin 4 of a 25-pin serial port or on pin 7 of a 9-pin serial port.
Disabled
Disables the RTS line when the device is opened.
Enabled
Enables the RTS line when the device is opened.
Handshake
Enables RTS handshaking. The driver raises the RTS line when the input buffer
is less than one-half full and lowers the RTS line when the buffer is more than
three-quarters full.
Toggle
Specifies that the RTS line is high if bytes are available for transmission. After
all buffered bytes have been sent, the RTS line is low.
DTR
Controls the Data Terminal Ready output pin. This sends a signal to the printer
or plotter on pin 20 of a 25-pin serial port or on pin 4 of a 9-pin serial port.
Disabled
Disables the DTR line when the device is opened.
Advanced Settings for COM Port Dialog Box | 1521