ATG429EBPOperationManual
3‐12
June4,2015
Rev.A2
Cares is a 24 bit hex mask to determine if a bit in the data word will be checked for status. This function is
particularly useful for trapping block data protocols. For example the Williamsburg Protocol, Bite Memory
Transfer and Alpha-numeric messages. It is also useful for monitoring a bus for a specific flag such as an
auto- pilot armed flag, where a specific bit in a specific word arms an auto-pilot and it is necessary to
determine when this event occurs.
In the example we have used, we are searching for a specific data field and the cares function is masked
by the entry of 7FFFFF. Some useful cares patterns follow:
7FFFFF = Masks parity off and allows for checking all bits in the data field.
OOOOO3 = Default bit which means only the SDI bits 9 & 10 will be checked.
600003 = SSM and SDI bits only checked, (bits 31 & 32 and 9 & 10)
Other bit parameters may be set as desired.
When viewing the 429EBP screen the display in the hex mode shows the following
information:
XXX XX XXXXXX XX
LABEL SDI DATA SSM
The SSM is in binary, the DATA in hex, the SDI in binary and the LABEL in octal.
4. The unit will now look for only this data and trap those words it receives with this data. It may
take a few moments for the first word to be received. As soon as the first word is received it is
possible to view the word by scrolling to it and viewing the data. The word should be 102 at
an altitude of 10000 ft. By selecting HEX on the switch, you can view the data which is
627100.
5. To turn off the trap mode depress the TRAP key.
3.3.3.4 Trapping Using the Trigger Trap Mode
1. To trap a string of data triggering from either a label and/or from data the trigger must be
armed. Depress the TRAP key depress ENT twice, then enter the data in label 102 for
10000ft which is 627100 and for CARES turn off the parity mask using 7FFFFF.
2.
When the information is entered the screen will display TRIGGER IS ARMED and the unit will
wait till it receives this data. As soon as the data is received, the unit will go into the normal
trap mode and it will trap the first label immediately following the data that was in the trigger.
This should be label 035 which has the fastest time out at a rate of 100 MS.
3.
This can then be viewed in the normal manner by scrolling through the labels. The first label
trapped will be 035 DME FREQ as it is transmitted at the fastest rate which is 100 MS and it
is followed by 034 and 033. Label 102 will only be caught in the string very sparingly as its
rate was set earlier at 500 MS.
4.
When trapping using the data only mode, note that it is necessary to enter the label first as
this mode traps only the label it is looking for. To trap label 102 starting when it reaches
10,000ft depress TRAP then the D key. Enter label 102, scroll TRIGGER DATA and enter
627100 then mask parity in cares with 7FFFFF. The first label 102 trapped by the unit will be
102 at 10,000 ft. (data 627100).
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