Code Error Description
90 Buffer overflow More than 30 characters were received without message terminator (<CR><LF>). Any subsequent
characters will begin a new message.
91 Timeout 10 seconds has elapsed since the last character was received without message terminator.
92 Bad opcode Message was received correctly terminated but not understood (e.g. ‘A0Q1<CR><LF>’ )
93 Bad operand Message was received correctly terminated and understood but the argument was malformed or out of
bounds (e.g. ‘A0C2=999.9<CR><LF>’).
94 Read only An attempt was made to write to a read-only parameter (e.g. ‘A0R1=1.2<CR><LF>’).
97 Initialising Sensor card is initialising asserted for 10 seconds after a reset or cold start
51-69 Configuration errors 51 Primary cell illegal for this board, 52 Secondary cell illegal for this board,
71-79 CRC error
(NVRAM errors)
Error 71 - user parameters CRC error. if this area is restored user calibration etc is LOST. Error 71 will
be reported in response to ANY read request until either a calibration is performed or the instrument
rebooted.
Error 73 & 75 automatically clear themselves so will not be seen.
Errors 72, 74 & 76 will be reported in response to any read request and cannot be cleared.
Specific errors
21-22 Calibration errors
(20 is OK)
21 K out of bounds during R1 low calibration
22 offset out of bounds during R1 low calibration
Sensor specific errors - report via the reading group (ie R1, R4 or R5
81 O/C Sensor open circuit
82 S/C Sensor short circuit
83 Reversed Sensor reversed
84 Not Normal Sensor behaving erratically (Heater Timed Out)
85 Not responding Drive to sensor on but shows low reading
86 Out of control Drive to sensor off but shows high reading
Table 2 - Error messages
Error messages take the form ‘? xx’ where ‘xx’ is a numeric code as explained below.
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