GHM Delta OHM HD52.3D Series, Operating Manual

Page: 34 / 46

HD52.3D…
- 34 -
V2.2
10 MODBUS-RTU MODE
In MODBUS-RTU mode, the instrument sends the acquired measurements only if specifically
requested by the PC, PLC or data logger.
The mode is available with RS232, RS485 and RS422 serial connections.
Communication parameters should be set in the PC or data logger as follows:
 Baud rate: same as the setting in the instrument (default =19200)
 Data bits: 8
 Parity: same as the setting in the instrument (default = even)
 Stop bits: same as the setting in the instrument (default = 1)
M
EASUREMENT READING
(function 04h)
The Modbus function code 04h allows reading the values measured by the instrument. The ta-
ble below lists the available quantities with the corresponding register number:
TAB. 10.A - Input Registers
Register
number
Quantity Format
From FW
version Note
1 Wind speed (x100) unsigned 16 bits 1.00 (1)
2 Wind direction in degrees (x10) unsigned 16 bits 1.00
3 Sonic temperature measured by the
first transducers pair (x10) 16 bits 1.00 (1)
4 Sonic temperature measured by the
second transducers pair (x10) 16 bits 1.00 (1)
5 Average of the two sonic temperatures
measured by the two transducers pairs
(x10)
16 bits 1.00 (1)
6 Temperature measured by Pt100 sen-
sor (x10)
16 bits 1.00 (1)
7 Relative humidity in %RH (x10) unsigned 16 bits 1.00
8 Barometric pressure (x1000 if the unit
of measurement is atm, x10 in the other
cases)
unsigned 16 bits 1.00 (1)
9 Compass angle in degrees (x10) unsigned 16 bits 1.00
10 Solar radiation in W/m
2
unsigned 16 bits 1.00
11 Mean wind speed (x100) unsigned 16 bits 1.00 (1)
12 Mean wind direction in degrees (x10) unsigned 16 bits 1.00
13 Absolute humidity in g/m
3
(x100) unsigned 16 bits 1.00
14 Dew point temperature (x10) 16 bits 1.00 (1)
15 Wind direction in degrees (x10) with
extended feature (see page 26)
unsigned 16 bits 1.00
16 Wind speed (x100) along V-axis unsigned 16 bits 2.00
17 Wind speed (x100) along U-axis unsigned 16 bits 2.00