CHEMINS INSTRUMENT CO., LTD Rev2020-04
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Request frame
：
06 03 00 00 00 04 45 BE
Response frame:
06 03 08 01 02 00 01 00 B0 00 01 90 48
Example of reading:
For example: Salinity value 01 02 means hexadecimal reading salinity value, 00 01 means
the salinity value has no decimal point , which is converted to the decimal value of 25.8.
The temperature value 00 B0 represents the hexadecimal reading temperature value, and
00 01 indicates that the temperature value has a decimal point and is converted to a decimal
value of 17.6.
b) Calibration instructions
Zero calibration
Function: Set the sensor's conductivity zero calibration value; here the zero calibration is
performed in the air;
Request frame: 06 06 10 00 00 00 8C BD
Response frame: 06 06 10 00 00 00 8C BD
Slope calibration
Function: Set the sensor's conductivity slope calibration value; here the slope value is based on
the actual standard solution value, and the calibration is taken as an example with 5000μS/cm;
Request frame:
06 06 10 04 01 F4 CD 6B
Response frame:
06 06 10 04 01 F4 CD 6B
c) Set the device ID address:
Function: set the Modbus device address of the sensor;
Change the device address 06 to 01. The example is as follows
：
Request frame:06 06 20 02 00 01 E3 BD
Response frame: 06 06 20 02 00 01 E3 BD
5. Error response
If the sensor does not correctly execute the host command, it will return the following format
information:
Definition
Address Function code Code
CRC check
Data
ADDR
COM+80H
xx
CRC 16
Number of bytes
1
1
1
2
a) CODE: 01 –Function code error
03 – Data is wrong
Conductivity value
Temperature value
01 02 00 01
00 B0 00 01