Kantronics KPC–3 Plus User Manual page 170

FULLDUP {ON | OFF | LOOPBACK}
default OFF
When OFF (i.e., half duplex), the data carrier detect signal is used as a packet collision
avoidance signal. When ON, the modem is run full duplex, and carrier detect does not
inhibit transmission. The full duplex mode may be useful especially for satellite
operations using duplex radio setups. Full duplex should not be used unless both you
and the station you are communicating with have full duplex capability. LOOPBACK is
the same as half duplex (i.e., FULLDUP OFF) as far as protocol is concerned, but the
receive circuit is still active; this allows you to connect a simple wire between the
transmit and receive pins on the radio connector to verify operation of the modem
circuitry.
If you have the MX version of the KPC-3 Plus, you will not be able to specify ON or
LOOPBACK unless you have installed a second MX modem chip.
In the most recent SMT revision of the KPC-3 Plus circuit board, there is no option for a
second modem chip. Therefore, OFF is the only setting for this command.
GPSHEAD n string (n = 1-4)
default 1 $GPGGA ( string 2, 3, and 4 = <blank>)
This command determines which GPS NMEA sentences will be stored in the LT buffers.
n (1-4) determines which buffer will be used to store the data, and string is a NMEA
sentence header.
When the header is received from the GPS unit, the KPC-3 Plus will store up to 128
characters in the associated LT buffer.
To clear one of the four strings, enter the buffer number, n (n = 1-4), and nothing
else, then press the ENTER key.
See also: blt, lt, ltp, ltrack
GPSINIT string
default (blank)
This command establishes a string which will be sent to the attached GPS unit upon
power-up (i.e., initial text sent to terminal in GPS Mode). This may be useful to configure
your GPS unit to provide only the information you require. Some GPS units may require
more than one sentence; consult your GPS unit manual. To send more than one, enter
a <Ctrl+N> at the end of each sentence, and the KPC-3 Plus will send a CR/LF
sequence to the GPS unit. A single % will clear the string.
See also: gpshead, intface
(string up to 128 characters)
170
(string up to 8 chars)