18
Read instruction mode
The communication protocol adopts MODBUS (RTU) protocol. The content and address of the
communication can be changed according to the needs of customers.
The default configuration is network address 01, baud rate 9600, even check, one stop bit, users
can set their own changes;
Function code 0x04: This function enables the host to obtain real-time measurements from slaves,
which are specified as single-precision floating-point type (i.e. occupying two consecutive register
addresses), and to mark the corresponding parameters with different register addresses.
Communication address is as follows:
0000-0001: Temperature value
0002-0003: Main Measured Value
0004-0005: Temperature and Voltage Value
0006-0007: Main Voltage Value
Communication examples:
Examples of function code 04 instructions:
Communication address = 1, temperature = 20.0, ion value = 10.0, temperature voltage =
100.0, ion voltage = 200.0
Host Send: 01 04 00 00 08 F1 CC
Slave Response: 01 04 10 00 41 A0 00 41 20 00 42 C8 00 43 48 81 E8
Note:
[01] Represents the instrument communication address;
[04] Represents function code 04;
[10] represents 10H (16) byte data;
[00 00 00 41 A0] = 20.0; / temperature value
[00 00 4120]= 10.0; // Main Measured Value
[00 00 42 C8] = 100.0; / / Temperature and Voltage Value
[00 00 43 48] = 200.0; / / Main measured voltage value
[81 E8] represents CRC16 check code;
Daily maintenance
According to the requirements of use, the installation position and working condition of the
instrument are relatively complex. In order to make the instrument work normally, maintenance
personnel need to carry out regular maintenance on the instrument. Please pay attention to the
following matters during maintenance:
1. Please check whether the installation box of the instrument is leaking or not when it is installed
outdoors;
2. Check the working environment of the instrument. If the temperature exceeds the rated range
of the instrument, please take appropriate measures; otherwise, the instrument may be
damaged or its service life may be reduced;
3. When cleaning the plastic shell of the instrument, please use a soft cloth and a soft cleaner to
clean the shell. Be careful not to let moisture enter the inside of the instrument.
4. Check whether display data of the instrument is normal or not.
5. Check whether the wiring on the terminal of the instrument is firm. Pay attention to disconnect
the AC power before removing the wiring cover.
Daily maintenance
According to the requirements of use, the installation position and working condition of the
instrument are relatively complex. In order to make the instrument work normally, maintenance
personnel need to carry out regular maintenance on the instrument. Please pay attention to the
following matters during maintenance:
1. Please check whether the installation box of the instrument is leaking or not when it is installed
outdoors;
2. Check the working environment of the instrument. If the temperature exceeds the rated range
of the instrument, please take appropriate measures; otherwise, the instrument may be
damaged or its service life may be reduced;
3. When cleaning the plastic shell of the instrument, please use a soft cloth and a soft cleaner to
clean the shell. Be careful not to let moisture enter the inside of the instrument.
4. Check whether display data of the instrument is normal or not.
5. Check whether the wiring on the terminal of the instrument is firm. Pay attention to disconnect
the AC power before removing the wiring cover.
