Company Confidential
25
Raveon Technologies Corp.
4. Program the modem’s operating frequency to your desired operating
frequency. This is done with the
ATFX xxx.xxxxx
command.
5.
Using the AT commands, change any of the default operating parameters that
must be modified. From the factory, the modems are configured and shipped
ready-to-use. Out of the box, they will communicate on the default radio
channel using the factory defaults. In general, the parameters you may want
to modify will be:
ATFX
Frequency for this channel. Set to your frequency.
ATBD
Serial port baud rate
ATMY
The ID of this unit. Default is 1234.
ATMK
The network address mask. Default is FFFF.
ATDT
The address of the unit this modem will talk to. Default is 1234.
6. Connect your serial data device to the TXD and RXD pins of the I/O
connector. To connect the M8T to an RS232 serial port, you will need an
external digital to serial level converter.
The M8T 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
M8T
modems are configured to simply work.
Plug in power and connect to the serial port at 9600 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.
8.2.
Programming Channels and Frequencies
The M8T modem has memory for up to 6 channels. 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.
2. Program the frequency for this channel x, using the
ATFT
,
ATFR
, or
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.
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.
