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Comments:
Date/Time:
The date/time column reports the time at which data was logged from the Modbus device.
Note: this is not necessarily the time at the start of the log cycle. Users with large number of devices may
notice some of the Modbus devices at higher address numbers report 1 or 2 seconds after the first Modbus
devices. This is because the 9600 baud speed of the Modbus loop is not fast enough to log all Modbus
devices in less than 1 second. If a device does not respond during a log cycle, the DAS will attempt to query
the device several more times. If a subsequent query is successful, the time of the successful query will be
used in the log file but may be several seconds after the initial log cycle.
The log date/time is in Universal time. (UTC) This means that the data is logged with no shift for daylight
savings time, and must be converted to local time for reporting purposes. When importing into a database,
data should be kept in UTC time for ease of use. When reporting the final data, you should adjust the time
to reflect the local timezone for which you are reporting. The data export option on the BMO website will
pro mpt you for a time zone when you export the data, and will adjust the log date/time accordingly.
Note: UTC is sometimes referred to as GMT. (Greenwich Mean Time).
Modbus Error:
If the error value is not 0, the remainder of the columns for this line will be reported
as NULL.
1 Operation not permitted
2 No such file or directory
3 No such process
4 Interrupted system call
5 Input/output error
6 No such device or address
9 Bad file descriptor
11 Resource temporarily unavailable
12 Cannot allocate memory
13 Permission denied
16 Device or resource busy
19 No such device
23 Too many open files in system
24 Too many open files
26 Text file busy
28 No space left on device
32 Broken pipe
52 Invalid Exchange
101 Network is unreachable
110 Connection timed out
111 Connection refused
113 No route to host
129 Illegal Function (function was not allowed by the slave device)
130 Illegal Data Address (the data address is not allowed by the slave device)
131 Illegal Data Value
132 Illegal Response Length
14 LOG FILE DATA
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