M7 GX Technical Manual
48
Raveon Technologies Corp.
Sending to Destination Address =
1001
Receiving Unit Address =
0001
Receiving Unit’s Address Mask =
F000
Result: No data will be received, because the address do not match, and the address mask of
FFFF requires that at least the first digit match. .
Example 3 (able to receive a data from a sub-group, 1000
– 1999)
Sending to Destination Address =
1236
Receiving
RV-M7
Unit Address =
1234
Receiving
RV-M7
Address Mask =
F000
Result: Data will be received. 1236 ANDed with F00 is 1000. 1234 ANDed with F000 is 1000.
The results of the ANDing perfectly match, and thus the data will be received.
Example 4 (able to receive from a sub-group, 34xx where xx is any two digits)
Sending Destination Address =
3410
Receiving
RV-M7
’s Unit Address =
3499
Receiving
RV-M7
’s Address Mask =
FF00
Result: Data will be received. FF00 means first two digits must match, and they do, so the
units will receive eachother.
10.2.
Store-and-Forward Repeating
The
RV-M7 GX
transponder has a built-in wireless repeater/router. Each
RV-M7
GX
is capable of not only sending and receiving data from/to its serial port, but also
re-transmitting over-the-air data. It is also able to re-transmit data that is
addressed to other modems in the system.
To extend the communication range, program one or more
RV-M7 GX
transponders to be repeaters. Do not configure ALL to be repeaters, because they
will typically just interfere with each other. It is best to locate one or two on
elevated locations near the desired radio coverage area.
A store-and-forward repeater re-transmits a message as soon as it receives it. If
one repeater is used on a system, they each message is sent on the air twice;
once by the originating RV-M7 and once by the repeater. This also means that
each message takes twice as much air time if there is one repeater, 3X as much
air-
time with two repeaters…
