Company Confidential
29
Raveon Technologies Corp.
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Figure 1 (Address Filtering)
One effect of this is that an address mask of 0000 will cause the
M8T
modem to
receive all data from all units that transmit data messages. The Destination
Address will effectively be ignored if the mask is set to 0000.
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.
Notes: This is the default configuration. All units have address 1234, and all modems will talk
to all other modems with address 1234.
Example 2 (a configuration that won’t work)
Sending to Destination Address =
1236
Receiving Unit Address =
1234
Receiving Unit’s Address Mask =
FFFF
Result: No data will be received, because the address do not match, and the address mask
of FFFF requires that all digits in the address match. .
Example 3 (able to receive a data from a group, 1230 – 123F)
Sending to Destination Address =
1236
Receiving
M8T
Unit Address =
1234
Receiving
M8T
Address Mask =
FFF0
M8 receives data
over-the-air to
Destination Address
xxxx
M8 has Unit
Address yyyy
M8 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
