TELEMETRY PI TEST_3 LITTLE_ENDIAN "Test Aggregate Packet"
    APPEND_ID_ITEM TST_PK_ID 16 UINT 153 "Packet ID which must be 149"
    APPEND_ITEM    VALUE_A    8   INT
    APPEND_ITEM    VALUE_B    8   INT

    ITEM  HEAD_LENGTH  32  16  UINT

    APPEND_ITEM    VALUE_C    16   UINT
    APPEND_ITEM    VALUE_D    4   UINT
#    ITEM TEMP_AVERAGE 0 0 DERIVED "Yo"
#      READ_CONVERSION multi_field_bit_conversion.rb VALUE_C VALUE_D