10
User Manual EE260 Heated Humidity and Temperature Probe for Meteorological Applications
Please note:
When reading the serial number or the sensor name, it is always necessary to read all 8
registers, even if the desired information requires less.
Please note:
For obtaining the correct floating point values, both registers have to be read within
the same reading cycle. The measured value can change between two Modbus requests, therefore,
exponent and mantissa may get inconsistent.
Communication settings (INTEGER 16 bit)
Parameter
Register number
1)
[DEC]
Protocol address
2)
[HEX]
Write register: function code 0x06
Slave ID (Modbus address)
1
0x00
Modbus protocol settings
3)
2
0x01
1) Register number starts from 1.
2) Protocol address starts from 0.
3) For Modbus protocol settings see Application Note Modbus AN0103 (available at
).
INFO (read register)
Parameter
Register number
1)
[DEC]
Protocol address
2)
[HEX]
Read register: function code 0x03 / 0x04
Serial number (as ASCII)
1
0x00
Firmware version
9
0x08
Sensor Name
10
0x09
1) Register number starts from 1.
2) Protocol address starts from 0.
Air pressure
Parameter
Register number
1)
[DEC]
Register address
2)
[HEX]
Read and write register: function code 0x03 / 0x10
Air pressure
3)
5001
0x1388
1) Register number starts from 1
2) Register address starts from 0
3) Ambient pressure in mbar, with 2 decimal digits (e.g. 1 008.25), default value 1 013.25 mbar
