HD2013.3 - 9 - V1.7
CONFIGURATION AND MEASUREMENT
The co figuratio of the i strume t a d the readi g of the measureme ts ca be do e
via the RS485 serial output, both with the proprietary protocol a d with the MODBUS-
RTU protocol.
I the first 10 seco ds after the i strume t power o , it is always active the proprie-
tary protocol. After 10 seco ds from power o , the operati g protocol is activated,
which by default is the MODBUS-RTU protocol.
It is possible to keep the proprietary protocol active eve after 10 seco ds from power o
by se di g, before the 10 seco ds expire, the comma d @ of the proprietary protocol.
The proprietary protocol ca be set as operati g protocol by mea s of the CP0 comma d.
The comma ds of the proprietary protocol a d the registers of the MODBUS-RTU pro-
tocol are described i detail i the followi g chapters.
Precipitation measurement:
To determi e if a precipitatio is i progress, the i strume t detects the perce tage of
dry se sitive surface of the se sor:
100% = se sitive surface of the se sor completely dry
0% = se sitive surface of the se sor completely wet
Whe the perce tage of dry se sitive surface of the se sor falls below a co figurable
threshold value (default 95%), the i strume t i dicates that a precipitatio is i pro-
gress. The threshold value ca be modified with the comma d CRT of the proprie-
tary protocol or by usi g the MODBUS holdi g register with address 5.
The i dicatio of precipitatio i progress ceases whe the perce tage of dry se sitive
surface of the se sor rises above the threshold plus a co figurable hysteresis value
(default 2%) a d after a co figurable delay time (default 2 mi utes).
The resolutio with which the perce tage of dry se sitive surface of the se sor is de-
tected is 1% by default. The resolutio ca be set to 0.1% with the comma d CRLR
of the proprietary protocol or by usi g the MODBUS holdi g register with address 16.
The i strume t discrimi ates betwee rai fall a d s owfall based o the measured
ambie t temperature. If the ambie t temperature is lower tha a co figurable refer-
e ce temperature (default 2 °C), the precipitatio is co sidered s owy.
The detectio se sitivity ca be adjusted with the comma d DRS of the proprietary
protocol or by usi g the MODBUS holdi g register with address 20.
Automatic calibration of the precipitation sensor:
The i strume t ca be set so as the precipitatio se sor calibratio is automatically
performed at regular i tervals; this allows compe sati g for a y drift of the se sor
due to temperature cha ges, agi g a d dirt deposited o the se sitive surface.
The correctio applied by each automatic calibratio is limited to a maximum value
(co figurable), so as to avoid erro eous calibratio s whe the detected value differs too
much from the estimated value.
By default, the automatic calibratio is e abled, with 30 mi utes i terval a d 0.1%
maximum correctio . I order to cha ge the automatic calibratio setti gs, see the
chapters o the proprietary protocol a d MODBUS-RTU protocol.
