Specifications

RV-M7 Technical Manual
37
` Figure 2 (Address Filtering)
One effect of this is that an address mask of 0000 will cause the M7 modem to received any data
from any unit that transmits. The Destination Address will effectively be ignored and all data
received if the mask is set to 0000.
Listen Address (Version C21 and higher firmware):
In modems with version C21 and higher firmware, which began shipping April 2011, there is another
addressing option called the “Listen Address”. The Listen Address is a second ID programmed into
the radio, that the unit will listen for. The Listen Address is configured using the ATLA xxxx
command.
If the Listen Address is set to FFFF, then this feature is ignored, and FFFF is the factory default so by
default the M7 does not use the Listen Address. If you would like an M7 to transmit using ID 1234
but also be able to receive data sent to ID 5555 then you could set the MYID to 1234 (ATMY
1234<enter>) and the Listen Address to 5555 using the ATLA command (ATLA 5555<enter>)
The Listen Address gives the radio the ability to receive data sent to a second ID, set with the ATLA
xxxx command.
Addressing Examples:
Example 1 (default configuration)
Sending Destination Address = 1234
Receiving Unit Address = 1234
Receiving Unit’s Address Mask = FFFF
Result: Unit will receive the data, because the addresses identically match. When the addresses are
identical, the value of the mask is not important.
M7 receives data over-the-
air to Destination Address
xxxx
M7 has Unit Address
yyyy
M7 has Address
Mask zzzz
“AND” them
together
Compare the two results
from these two ANDs
“AND” them
together
Output the data via serial
port if the two results
were identical