XLINK 500/100 Operations & Maintenance Manual page # 90
Time of Max Speed – This is the time in seconds past midnight when the
maximum speed was recorded.
9.3.7. Measure Type: Digital
Use the setting Digital Type to indicate what kind of sensor is connected.
Digital Type
The following digital types are supported:
Level 1&2
Counter 1&2
Frequency 1&2
Period 1&2
The sensors should be connected to terminals #9 and #10 for digital input 1, and terminals #11
and #12 for digital input 2.
Frequency will have the system sample the input for 750ms. It will provide a result that is the
average frequency of the input during that time span.
10kHz is the maximum supported input frequency.
When Period is the chosen type, the system will watch the input line for up to 10 seconds. The
system stops watching as soon as one wave period is noticed on the input. Please note that a
period measurement could take just over 20 seconds to complete (up to 10 seconds per edge of
the signal). If such a slow signal may appear on the input, please make sure that the
measurement interval is long enough (longer than 20 seconds) to prevent missing
measurements.
Digital measurements also use the Warmup setting. If Warmup is not zero, then switched power
and VREF will be turned on during a Digital measurement. See the section on analog
measurement types for details on Warmup.
Counter type readings may be optionally de-bounced for 4ms using the Debounce setting. The
4ms de-bouncing eliminates false counts from tipping buckets and other devices with noisy
switches.
Counter type readings may also be limited by a rollover value. With rollover set to 0, the counter
will increase until it reaches 4,294,967,296 (2^32). With rollover set to a non-zero value, the
counter will be reset to 0 when it exceeds the rollover value. For example, if rollover is set to
9999, the counter will be reset to 0 on the 10000 count.
Please note that counter and tipping bucket measurements will keep counting even when
recording is off.
Multiple measurements may be setup on the same digital input. For example, it is possible to
setup both a tipping bucket rate and a tipping bucket accumulation on the same input.
That being said, some setups that share digital inputs will yield unpredictable results.
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