HD2013.3
- 16 -
V1.2
6
MODBUS-RTU PROTOCOL
By default, the instrument has MODBUS address
1
and communication parameters
19200, 8E1. The address and the communication parameters can be changed by using
the appropriate serial commands of the proprietary protocol or, alternatively, directly
with MODBUS commands by changing the value of the Holding Registers described
later.
The MODBUS-RTU protocol, if set as the operating protocol (default), is active after 10
seconds from the instrument power on.
In order to change the instrument configuration using the MODBUS-RTU protocol, the
value 1 must be written first in the
Coil
number 2 (address 1).
Below is the list of registers (the tables show both the number and the address of the
registers, with the address of the register equal to the number of the register
decreased by 1, as defined in the MODBUS standard).
Discrete inputs:
Number Address
Description
Format
1 0
Indication of no precipitation (0) or precipitation in
progress (1).
Bit
2
1
Validity of the precipitation indication: 0=no, 1=yes.
Bit
3 2
Indication of the type of precipitation:
0=rainfall, 1=snowfall.
Bit
Input Registers:
Number Address
Description
Format
1 0
Instrument
model
identification.
16-bit Integer
2
1
Instrument hardware revision.
16-bit Integer
3,4 2,3
Instrument
serial
number.
(*)
16-bit
Integer
5 4
Instrument firmware revision. The most significant byte
indicates the major revision; the less significant byte
indicates the minor revision.
16-bit Integer
6
5
Number of reboots that occurred.
16-bit Integer
7
6
Number of watchdog timeouts that occurred.
16-bit Integer
8
7
Power supply voltage in Volt (x10).
16-bit Integer
9
8
Internal board temperature (x10).
16-bit Integer
10 9
Number of 12-bit ADC counts, proportional to the
percentage of dry sensitive surface of the sensor.
16-bit Integer
11 10
Percentage of dry sensitive surface of the sensor (x10
if the resolution is 0.1%).
16-bit Integer
12
11
Number of MODBUS communication error.
16-bit Integer
13 12
Ambient
temperature
(x10).
16-bit
Integer
14 13
Heater
temperature
(x10).
16-bit
Integer
15
14
Percentage of heating power used.
16-bit Integer
(*)
The Instrument serial number has 8 digits. Two consecutive registers must be accessed to
read the number. The register with lower address contains the most significant 4 digits.
Summary of Contents for Delta OHM HD2013.3
Page 5: ...HD2013 3 5 V1 2 Fig 2 1 dimensions mm Bird spikes optional Bracket ...
Page 21: ...HD2013 3 21 V1 2 NOTES ...
Page 22: ...HD2013 3 22 V1 2 NOTES ...
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