will send out the string sig error:XXXX:YYYY when an error is detected, where XXXX is the
signature as it’s being read and YYYY is the stored signature.
The error string is sent out via the RS-232 port automatically and will also be returned to the data
logger the next time any attempt is made to read information from the sensor. The message will
be output at the default baud rate of 9600 bps, 8-bits, 1 stop, and no parity.
If this error is seen, contact Campbell Scientific to obtain a copy of the latest operating system
and load it into the SDM-SIO2R using the preceding procedure. If this does not correct the fault,
the unit may be faulty and will need to be returned to the factory for repair.
8.2.3 Checking the operating system version and
signature
It is not possible to check the current operating system version using
Device Configuration Utility
as the SDM-SIO2R is designed as a transparent RS-232 device. Instead, the operating system
version can be checked by loading a program into the data logger to which it is attached. The
following program shows use of the
SDMGeneric()
instruction to ask the SDM-SIO2R with a
specific address what the operating system version is (Ver_value) and the signature of the
operating system (Sig_value).
SDM-SIO2R Serial Input/Output Module with Switched Sensor Power
40
