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198-1600-00 Rev F
B.1.18
Error History Command “h”:
@AA.a Sync character (@) and unit address, AA = Unit ID (0 to 99; 0 is a global ID), a (n/a, set to
zero)
h0
Command character and Type
– 0=read, 1=set(n/a), 2=activate(n/a), 3=ack, 4=nak
#6,
Number of fields character and number of fields after the comma, excluding CRC
(variable)
12,
Error number (0 to 65535)
err
1,
Occurance Count (1 to 65535)
occ
12123, Time stamp of last occurrence in minutes (0 to 65535)
min
26,
Error number (0 to 65535)
err
4,
Occurrence Count (1 to 65535)
occ
12125, Time stamp of last occurrence in minutes (0 to 65535)
min
CRC
CRC value in ASCII decimal
crlf
Carriage return and Line feed (0x0D 0x0A)
Examples of Error History Command:
read error history command from unit 1.
@01.0h0#0, 54321
ACK error history command with default text delimiters.
@01.0h3#9,12err,1occ,12125min,27err,5occ,12125min,29err,255occ,12128min, 54321
ACK error history command with comma delimiters.
@01.0h3#3,12,1,12125, 54321
Notes:
1. This is a variable length message, dependent on the number of errors in the error history.
2.
The error history is not an indication of active error codes, use the error status “m” command to
determine active error codes.
3. Not all errors are logged to the error history, see the list of error codes for details regarding which
error codes are logged.
4. The error history information is preserved through power cycles.
5. There is a limited space to store errors in the error history. Only the most recent errors are stored.
Once the error history is full the oldest errors are overwritten.
6. The time stamp of the last occurrence of the error is derived from the total system on time minutes.
The logged time stamp has a maximum value of 65535 minutes. The time stamp contains the 16
least significant bits of the total system on time. As such every 1092 hours of operation the time
stamp logged will roll over to zero.
7.
The channel ID ‘a’ should always be zero.