M7 GX Technical Manual
31
Raveon Technologies Corp.
SLOTNUM
This will change the TDMA slot assignment, leaving the ID (MYID)
unchanged. Typically, the ID and the slot number are the same.
Once this command is used, the TDMA slot number for this
transceiver to will not change if the ID of the device is changed.
Set SLOTNUM to -1 to force the Slot Number to be automatically
set to the MYID of the radio. This is the factory default setting.
7.
Connect your serial data device (GPS, Plotter, PC…) to the 9-pin connector on
the front of the modem.
The radio is now ready to use. Any serial data going into the modem will be
transmitted over the air, and any data received over the air will be sent out the
serial port.
Remember, that from the factory, all
RV-M7
GX modems are configured to simply
work. Plug in power and connect to the serial port at 4800 baud, and the modems
will communicate on the default channel. Change the channel frequency to your
specific frequency, and they will be ready to work on your channel.
What you will see come out of the serial port with the factory default settings (GPS
4 mode), is a
$GPWPL…
message, every time one RV-M7 GX in your system
transmits.
6.1.
Programming Channels and Frequencies
The
RV-M7
modem has memory for up to 6 channels. In most applications, only
one channel is needed. A channel is a pair of frequencies, one for transmit and
one for receive. They may be different or they may be the same. You may
program any valid frequency into any channel number. To program a channel,
perform the following steps.
1. Change to the channel you wish to program, using the
ATHP x
command,
where x is the channel number. The factory default is channel 1.
2. Program the frequency for this channel x, using the
ATFX
command. Note that
the frequency my be entered in MHz as long as you use a decimal point. For
Example, enter
ATFX 450.1
to set the channel frequency to 450.100MHz.
Alternately, you may enter the frequency in hertz by entering
ATFX 450100000
.
You must enter all of the zeros if you enter the frequency in hertz. To enter
different TX and RX frequencies us the
ATFR
and
ATFT
commands.
3. Review the frequency setting with the
ATFT
,
ATFR
, or
ATFX
command. To
see a list of all of the channels , enter
ATF
.
4. To change the radio channel, use the
ATHP
x
command while the modem is in
the command mode.
The RV-M7-VM MURS version of the M7 has five user selectable channels. The
channel is selected with the
ATHP
command. The RV-M7-VM modem is factory-
set to these five channels, and the modem cannot be programmed to operate on
any frequency other than these five.
1
151.820 MHz
2
151.880 MHz