INVT CHV160A Series - Page 203

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Modbus adopts “Big Endian” representation for data frame. This means that when a
numerical quantity larger than a byte is transmitted, the most significant byte is sent first.
RTU mode
In RTU mode, the Modbus minimum idle time between frames should be no less than 3.5
bytes. The checksum adopts CRC-16 method. All data except checksum itself sent will be
counted into the calculation. Please refer to section: CRC Check for more information.
Note that at least 3.5 bytes of Modbus idle time should be kept and the start and end idle
time need not be summed up to it.
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CHV160A series special inverter for water supply
The table below shows the data frame of reading parameter 002 from slave node address
1.
Node addr. Command Data addr. Read No. CRC
0x01 0x03 0x00 0x02 0x00 0x01 0x25 0xCA
The table below shows the reply frame from slave node address 1
Node addr. Command Bytes No. Data CRC