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Raveon Technologies Corp.
transmission. Once the modem has sent its data the number of times the user
specified in the
ATRB xx
command, the data is discarded, and the modem will
continue to operate as normal.
It is very important that if one modem is configured to send ACK packets (
ATAK
1
) that all other modems communicating with it are also set to expect ACK
packets using the
ATRB xx
command.
To disable ARQ (the default condition of the modem), disable ARQ with the
ATAK 0
and set retries to zero with the
ATRB 0
command.
5.6. Store-and-Forward Repeating
The
M8
modem has a built-in wireless repeater. Each M8 is capable of not only
sending and receiving data from/to its serial port, but also re-transmitting data
packets it receives over-the-air data.
Automatic Repeater Configuration
The easiest way to enable store-and-forward repeating is the use the
REPEAT 1
command.
REPEAT 1
will turn on the store-and-forward feature, and configure it
to repeat all packets the radio can hear on the air.
REPEAT 0
disables store-
and-forward repeating.
It is highly recommended that you use this method to configure your M8 as a
repeater.
Important: The Unit ID of the repeater must be unique in the system. No other
radio modem in the system can have the ID of the repeater.
Manual Configuration of the Repeat Feature
There is a sophisticated packet repeating algorithm in the M8, and it may be
manually configured for more complex repeating scenarios. In most cases this is
not needed. Simply use the
REPEAT 1
command. But, if you do not wish the
repeater to repeat all packets, you may manually configure the Repeater Table
within the M8. The Repeater Table is a table of IDs that the M8 should repeat. It
contains a range of IDs and a mask. There may be up to 4 entries in the
Repeater Table, each with a different range of IDs that should be repeated.
Important: The Unit ID of the repeater must be unique in the system. No other
radio modem in the system can have the ID of the repeater.
Data is transmitted over-the-air in bursts called packets, and each packet has the
Unit ID of the M8 that sent the data and the Destination ID of the unit that the
data is intended for.
