User's Manual

ATFX Frequency for this channel. Set to your frequency.
ATMT 0 0 for normal Packetized operation. Default mode.
ATAK 0 for no ARQ, 1 if this unit sends ACKs. Default is no ARQ.
ATRB Set the number of retries if ARQ is used (x). 0 if no ARQ used.
Factory default is no ARQ.
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.
ATBC Enable/disable busy channel lock-out. Default is off, 0.
6. Connect your serial data device 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 FireLine 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.
4.2. Selecting Channels
The RV-M5-VB-N2 MURS Band FireLine modem has 5 channels in its
memory bank. A channel is a pair of frequencies, one for transmit and one
for receive. To select or change a channel use the ATHP x command, where
x is the channel number.
If the channel number is changed using the ATHP command, and power is
later lost, the channel number will be retained in non-volatile memory as long
as was saved using the ATSV (Save to non-volatile memory) command.
4.3. Data Transmission
To transmit data, simply send one or more bytes of data into the serial port of
the modem. When a full packet of data has been collected into the internal
buffer of the modem, or when there is a pause in the data, the modem will
automatically key its transmitter, and send the data over the air.
Serial Port Baud Rate
While the modem is transmitting, the user may continue to send more data
into the FireLine. Because the buffers in the FireLine are full-duplex, the serial
port data rate and the over-the-air data rates are independent. The serial port
baud-rates may be set slow to accommodate legacy equipment, or set at
high-speed to minimize latency. The over-the-air data rate us usually 4800
baud for narrow-band channels, and 9600 baud for wide-band, although
faster or slower rates may be used.