Kantronics KPC–3 Plus User Manual page 211

RTS - REQUEST TO SEND: The KPC-3 Plus checks this line to see if it is permitted to
send data to your computer. This pin is controlled by your computer software program
to provide this information to the KPC-3 Plus. This pin is used for hardware flow control.
CTS - CLEAR TO SEND: The KPC-3 Plus uses this line to signal your computer when it
can no longer accept data from the computer, or to signal that it is again ready to accept
data. This pin is used for hardware flow control.
DSR - DATA SET READY: This line is set high to indicate that the modem is ON.
DCD - DATA CARRIER DETECT: The KPC-3 Plus uses this pin to signal the status of
the current I/O stream to your computer. If you are connected to another packet station
on the current I/O stream, this line will have a positive voltage on it. If you are
disconnected, the voltage on this line will be negative.
DTR - DATA TERMINAL READY: Although interconnected via a buffer IC to the
processor, this line is currently ignored.
Optional Wiring
It is possible to re-configure the DSUB-25 connector to allow some additional functions
through this connector.
Applying Power through the DSUB-25 connector.
If desired, you may apply dc power to the KPC-3 Plus from Pin 13 of the DSUB-25
connector. To enable this, connect J6 center pin and pin 2, J7 center pin and pin 1.
Resetting the KPC-3 Plus through the DSUB-25 connector.
If desired, EXT-IN via pin 13 of the DSUB-25 connector may be configured to allow you
to perform a soft reset. This is accomplished by connecting J6 center pin and pin 1, J7
center pin and pin 1. A momentary contact to ground will cause a soft reset.
Hardware handshaking with DSR and DTR.
It is possible that some terminals or computers use the DTR and DSR pins for hardware
handshaking instead of the RTS and CTS pins. When this is the case, you must
connect the DTR terminal output to RTS on the KPC-3 Plus, and connect the DSR
terminal input to CTS on the KPC-3 Plus.
Software settings
When using a standard terminal program to communicate with the KPC-3 Plus, you
must set the serial port configuration in your program for 8 data bits, no parity, and one
stop bit. The baud supported by the KPC-3 Plus are 300, 600, 1200, 2400, 4800, 9600,
and 19200. In general you should use the fastest baud your terminal program and
hardware supports. The KPC-3 Plus defaults with ECHO ON, so you should set your
terminal program for ―full-duplex‖ operation.
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