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== How to parse Tell Tale data ==
 
== How to parse Tell Tale data ==
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4 FMS IO elements created:
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Tell Tale ID0
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Tell Tale ID1
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Tell Tale ID2
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Tell Tale ID3
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Each ID represents Block ID of Tell Tale.
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IO elements store information that is received from FMS Tell Tale Status message (CAN ID - 0x00FD7D).
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Status message sends Data Block information in Data Byte 1. Block ID is determined by Data Byte 1 first 4 Bits. Example in hexadecimal first 4 bits where X – random byte value.
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X0<sub>16</sub> – Block ID 0 - FMS IO element Tell Tale ID0
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X1<sub>16</sub> – Block ID 1 - FMS IO element Tell Tale ID1
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X2<sub>16</sub> – Block ID 2 - FMS IO element Tell Tale ID2
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X3<sub>16</sub> – Block ID 3 - FMS IO element Tell Tale ID3
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Once Block ID is captured all 8 bytes of Tell Tale message are saved to corresponding Tell Tale IO element.
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Example of FMS Tell Tale status data:
 
Example of FMS Tell Tale status data:
 
[[File:Tell Tale.PNG]]
 
[[File:Tell Tale.PNG]]
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Test
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When device is powered up all elements are be updated to the first corresponding message.
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After 4  seconds (1000 ms per Block ID) all values will be captured again. Device checks last saved value of Tell Tale IO elements and if it is changed – values are updated.
     

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