8 | Functions Baumer
30 Operating Manual OM20/ OM30 RS485 with Modbus RTU | V1
8.3 Trigger mode
The Trigger mode function controls the acquisition of the measured values and thus also the
measurement frequency. The parameter settings offer you a choice between the Free Running
and Interval trigger modes.
Free Running trigger mode
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The sensor measures constantly and at the highest possible measurement frequency.
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The maximum measurement frequency varies depending on the characteristics of the mea-
surement object (or the exposure time). Example: Dark measurement objects (longer expo-
sure time) result in a lower measurement frequency than light-colored measurement ob-
jects.
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The maximum measurement frequency is independent of the selected filter settings, since
measurement and processing of data proceed simultaneously.
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Purpose/application: The Free Running trigger mode can be used in most applications (fac-
tory setting). The fastest possible recording of measurement results ensures a larger
amount of data.
Interval trigger mode
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The sensor measures with a constant time interval (adjustable in µs).
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Observe the maximum possible measurement frequency in the Interval mode as well. If the
maximum possible measurement frequency is exceeded, the performance can worsen.
Therefore:
▪ Measure the maximum possible measurement frequency in the Free Running mode.
▪ Calculate the minimum time interval as follows:
min.time interval=1/max.measurement frequency
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Purpose/application: Use with dynamic applications (e.g. measurement objects on a con-
veyor belt) to detect all measurement objects.
Modbus RTU command – holding register: Trigger mode
Address 400 – Trigger Mode:
Address Access
Number of
registers Data type Description
400 - 401 Read/write 2 int32_t Select the trigger mode:
n
0: Free Running
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2: Interval
Address 402 – Fix Time Trigger Intervall:
Address Access
Number of
registers Data type Description
402 - 403 Read/write 2 uint32_t Numerical time interval in Interval
mode [µs]
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