GHM Delta OHM HD2013, Operating Manual

Page: 9 / 32

HD2013
- 9 -
V1.6
The current analog output is active. The maximum value of the load resistance de-
pends on the power supply value:
R
L
max = 50 x (V
dc
– 7)
Ω
The minimum value of the load resistance for the version with voltage analog output is
10 K
Ω
.
In case of a measurement error, the analog output goes to the value 22 mA or 11 V.
The reset line allows the partial amount of rainfall measurement (amount of rainfall from
the last reset command) to be remotely reset. During the measurement, the reset line
must be connected to GND. To reset, disconnect the line from GND and apply a direct
voltage of at least 3 Vdc (and lower than or equal to the power supply) for at least 1 s,
then reconnect the line to GND.
Connection of SDI-12 digital output (only HD2013…S…):
Perform the connections as shown in figure 3. 3. Set the SW1 switch up, towards the
INTERNAL indication (the contact output is disabled).
Fig. 3.3 – Connections of SDI-12 digital output
The reset line is not used in the version with digital output: the reset is performed
with the appropriate SDI-12 extended command (
aXDRES! , with a =address of the
rain gauge).
Not connected
GND
SDI-12 output positive
Power supply positive
SW1 switch
To SDI-12 bus