DeltaOHM HD2016, Руководство по эксплуатации, Страница: 7 / 34

HD2016
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V1.4
The heater power supply (only HD2016R) is connected directly to the internal terminal block.
Unscrew the cover of the electronic board (point 8 on page 4) and pass the cable through the
cable gland (point 12 on page 4). Use a cable with 2.5 mm
2
(AWG 13) minimum wires section.
The heater power supply is isolated from the measuring circuit.
The following figure shows the electronic board.
Fig. 3.1.2: electronic board
WARNING FOR VERSION HD2016R:
In order to prevent possible burns by coming into contact with the heater,
make sure that the heater is NOT powered when the cylindrical cover of the
rain gauge is removed for cleaning or maintenance operations.
3.2 C
HOOSING THE DIGITAL OUTPUT AND THE PROTOCOL
The selection of the type of digital output is done by means of the switch SW1 on the electronic
board. Set the switch toward the RS485 or SDI-12 indication depending on the desired output.
The switch is set at the factory toward the RS485 indication (unless otherwise requested).
The switch
S1 of the DIP switch on the electronic board allows selecting the communication
protocol of the digital output at the instrument power-on. Set the switch S1 toward the MOD-
BUS indication to select the standard protocol (Modbus-RTU or SDI-12 depending on the digital
output selected with the switch SW1), or set the switch toward the ASCII indication to select
the ASCII proprietary protocol. If the standard protocol is selected, it is possible to switch to
the ASCII proprietary protocol while the instrument is operating as described in the paragraph
Heater
power supply
Upper valve
Discharge valve
NTC
Heater
resistance
contact
output