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External Sensors J
You can configure an Asset Surveyor external sensor interface to
recognize these messages and to strip off the message packaging. It is
not possible for the Asset Surveyor software to actually verify the
checksum (2B in the example above), as these vary from message to
message.
Note – You can configure the Criterion to display and transmit heights
in feet, in which case ‘F’ would appear in the RS232 message example
above in place of the letter ‘M’.
Note – The data messages emitted by the Criterion 400 differ slightly
from those emitted by the Criterion 300 in that they begin with the
prefix $PLTIT instead of $PLTIC3. If you are using a Criterion 400,
be sure to substitute $PLTIT for $PLTIC3 when configuring your
external sensor interface. The following examples refer specifically to
the Criterion 300.
J.2.1 Data Dictionary Configuration
In order to make the best use of the heights transmitted by the
Criterion rangefinders, set up a data dictionary with a Height attribute
in each feature whose height concerns you. The Height attribute
should be a numeric attribute with two decimal places and appropriate
maximum and minimum values.
Note – The attribute’s name does not have to be Height. It is, however,
good practice for each attribute’s name to reflect the nature of the data
that you plan to record into it. The attribute name must be the same for
each type of feature whose height you want to record using your
rangefinder.
TSC1 Asset Surveyor Operation Manual 405