Raveon RV-M8R, Technical Manual

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Company Confidential 30
Raveon Technologies Corp.
Result: Data will be received. 1236 ANDed with FFF0 is 1230. 1234 ANDed with FFF0 is
1230. The results of the ANDing match, and thus the data will be received.
Example 4 (able to receive from a group, xx34 where xx is any two digits)
Sending Destination Address = 2234
Receiving M8
’s Unit Address =
1234
Receiving M8
’s Address Mask =
00FF
Result: Data will be received. 2234 AND 00FF equals 0034. 1234 AND 00FF equals 0034,
therefore they match. The results of the ANDing match, and thus the data will be received.
8.5. Store-and-Forward Repeating
The M8S modem has a built-in wireless repeater. Each M8S 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 M8S 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 M8S 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 M8S that sent the data and the Destination ID of the unit that the
data is intended for.