Solartron Mobrey 3595 4C, User Manual

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Results and Error Formats 3595 4C User Manual Part Two
2-12
35952350 (CH02/AA)
2.7 IMP ERROR MESSAGES
Error messages are transmitted by an IMP instead of a 4-byte result. They occur only in response to a ME
or TR command.
An error message is in the form of a 4-byte analogue result with a negative sign and an exponent of 255. In
hexadecimal format, this is represented by any number in excess of ‘FF800000’. In IEEE 754 floating-point
format, this is equivalent to ‘Not a number’.
FF81 xxxx Analogue overload. The input to an analogue measurement channel has exceeded the
maximum value of the present range.
FF82 xxxx User thermocouple undefined. Returned when a channel mode is set to 39x or 3Ax, but
the corresponding thermocouple has not been defined. (3595 1H and 1J only)
FF83 xxxx Out of linearisation range. Returned by a thermocouple channel when the temperature is
out of measurable range.
FF84 xxxx Ambient temperature range. The IMP has been instructed to use a temperature reference
outside the permitted range (-30
°
C to +80
°
C).
FF85 xxxx Transducer error. The IMP analogue-to-digital converter is unable to decide a value. This
error is commonly due to an open-circuit input or a large over-voltage.
FF86 xxxx Open-circuit thermocouple error. Open-circuit thermocouple checking is enabled and the
IMP detected a failure.
FF87 xxxx Unknown mode, type or range. The IMP has been instructed to select an inapplicable
channel mode or an unsupported integration time.
FF88 xxxx This error code is unassigned.
FF89 xxxx Channel number out of range. A channel number, n, outside the permitted range has
been specified. The permitted range is 1
≤
n
≤
10 (for IMP type 3595 1B) or 1
≤
n
≤
20 (for
IMP types 3595 1A, 1C, 1H, 1J and 2A).
FF8A xxxx System zero error. The IMP is unable to perform a drift correction.
FF8B xxxx System calibration corrupt. The calibration constants (including backup values) held in
non-volatile memory show 'read errors’. Non-volatile memory is either corrupted or not
fitted.
FF8C xxxx Strain gauge not initialised. The IMP database must be loaded with the gauge offset
resistance and factor. See the ‘Command Directory’ entry for
IN . (Relevant only to IMP
type 3595 1B.)
FF8D xxxx Digital result pending. (Relevant only to IMP types 3595 1H and 1J.)
FF8E xxxx Period time-out. The IMP has tried to measure a time period but took longer than the
maximum time allowed (as set by the
CH TI command).
FFFF xxxx Not measured. The channel has been set to ‘skip’, ‘digital output’ or ‘event capture’.
The remainder of possible error codes are unassigned.