SOMMER SPA-2, Manual

Page: 90 / 111

12 Parameter definitions
A Measurement trigger 90
B Measurement Interval 90
C Measurement table 91
D Snow depth adjust 95
E Snow depth test 95
F Technics 95
G Special functions 109
A Measurement trigger
Measurements are initiated by one of the options listed in the table below.
The commands to trigger measurements via RS-485 and SDI-12 are described in Section 11.3.8 and
Section 11.4.6 , respectively.
Measured data are either returned directly after the measurement or can be requested by com-
mands via the RS-485 or SDI-12 interface. The format of the returned data can be configured in the
sub-menu
Output protocol (OP) .
Option Description
Interval (default) Measurements are initiated in a specified interval.
TRIG input Measurements are triggered by the positive edge of a DC-voltage signal
applied to the TRIG input (low: 0 ... 0.6 V, high: 2.2 ... 28 V, min. pulse width:
30 ms)
SDI-12/RS-485 Measurements are externally triggered by commands via RS-485 or SDI-12
from ,e.g. a data logger.
all allowed Measurement is triggered by all options mentioned above.
B Measurement Interval
An internal measurement interval can be set for the SPA-2. If selected in menu item Measurement
trigger , measurements are performed in the defined interval. However, a measurement is always
completed before a new one is initiated.
Unit sec seconds
Value range 00:00:01 … 12:00:00 00:01:00 (default)
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