
ZENO
®
-3200 USER MANUAL
Coastal Environmental Systems (206) 682-6048
Page 222
If you plan to read each sensor N times, then the total time required to read all of the sensors N times
is defined by the next equation:
If the total time required to read all Sensor Records (T
total
) exceeds the
Sample Duration, the Sample Duration Time will need to be increased to a
value greater than or equal to T
total
. This may include increasing the
Sample Interval Time.
257
Use a common Sensor Timing Loop for the listed Sensor Records. Set the time of the Sensor Timing
Loop to a value greater than or equal to the sum T
Once
.
If the Sensor Records are to be read at different rates, use the following steps when you configure more
than one Sensor Record that uses the same resource:
Make a list of all the Sensor Records that use a shared resource.
Arrange the list of Sensor Records in descending order according to how many times each one needs
to be read within the Sample Duration. If possible, arrange the Sensor Records in the ZENO
®
-3200
in the same manner, as although this isn't necessary, it will make things easier to remember.
Remember: there are only four Sensor Timing Loops available.
If there are more than four Sensor Records that share the common resource, you will be limited to
four groups of sensors where each group can be read a unique number of times during the Sample
Duration. (Each group will share the Sensor Timing Loop.) Let N
1
, N
2
, N
3
and N
4
represent the
number of times that you want to read the Sensor Records in each of the four possible groups
respectively.
Determine the total time (T
1
, T
2
, T
3
and T
4
) required to read the Sensor Records in each of the four
possible groups once respectively.
Determine the overall total time (T
total
) and total number of individual sensor reads (N
total
) to read
all of the Sensor Records in all of the four possible groups of Sensor Records by using the following
equation:
257
Refer to Section 3.1.3.
44332211
4
1
TNTNTNTNTNT
i
iiTotal
OnceTotal
TNT
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