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5.3 Built-In Test and Extended Built-In Test
During normal operation, if the user wants the unit to perform a BIT, they must request it using
the “?bit” command or the extended “?bit,2” command, described in Section 8. The output of a
BIT is described in Table 5-11. The user-requested ?bit results are performed without affecting
real-time operations or high-speed message output. The user-requested ?bit,2 results contain
extended test diagnostics information and may impact high-speed message outputs during the
extended BIT communication time.
Table 5-11: Normal Mode BIT Output
Always 0xFE8100AA or 0xFE8100AB (transmitted 0xFE first)
The data is described in Table 5-12 through Table 5-19.
Is 6 bytes for ?bit (header 0xFE8100AA)
Is 8 bytes for ?bit,2 (header 0xFE8100AB)
The checksum will be calculated by accumulating the sum of
each byte of data, modulo 256.
The results of each test are indicated with a 1-bit pass/fail flag, 1 indicating a “pass” condition,
while a 0 indicates reduced confidence in the measurement (“fail”). (See Table 5-12 through
Table 5-19 for the complete test list.) Most users do not need the granularity provided by these
six bytes, but the extra data is useful for diagnostic purposes. (See Table 5-21 for which bits
are relevant for each sensor.)
In the following tables (Table 5-12 through Table 5-19), the reserved bits are the most
significant bits of their respective bytes. Byte 0 is the first transmitted, byte 7 is the last. The
number in parentheses in the “Bit Number” column is the number referenced by Table 5-20.
Table 5-12: Test Results Byte 0
Notes (Unless Otherwise Noted: 1 = PASS, 0 = FAIL)
Table 5-13: Test Results Byte 1
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