Operating Manual V25/09.2019
Ventus / Ventus-X / V200A
Chapter 20 Appendix
67
20.7.3.1 Function 0x03 Read Holding Registers
The Holding Registers are used to make a selected set of adjustable parameters available on
Modbus also. Similar to the measurement values are mapped to 16bit integer values, if
necessary by appropriate scaling
Reg.
Adr.
Reg.
Addr.
Function
Values
Scale
1
0
Local Altitude
Altitude in m, for calculation of relative air
pressure
Value range -
100 … 5000
1.0
2
1
Heating operating
mode
High-Byte: Heating Operating Mode *)
Low-Byte Heating Power Mode *)
For details see 6.3.1 and 12.2.6
3
2
Stationsreset
(function when writing only, returns always 0)
*) Value Range High-Byte (Operating Mode):
0
Off
1
Automatic
2
Test Mode (maintenance only)
3
Off,if ext.control line „high“, otherwise automatic
4
Off,if ext.control line „low“, otherwise automatic
*) Value range Low-Byte (Power Mode)
0
Full heating power
1
Reduced heating power, alternating lower and upper
heating element
The register value is calculated as (power mode) + 256 * (operating mode),
e.g. full power, automatic: 0 + 256 * 1 = 256, or reduced power,automatic: 1 + 256 * 1 = 257
20.7.3.2 Function 0x06 Write Holding Register, 0x10 Write Multiple Registers
Selected parameters of the
Ventus
can be adjusted by writing to the Modbus holding registers.
Register assignment see above 20.7.3.1.
The values are checked for plausibility. Improper values will not be accepted and cause a
Modbus exception.
Writing the value 0x3247 (12871d) into register no. 3 (register adr. 2) will trigger a device reset.
