VFD500 high performance vector control frequency inverter user manualAppendix A Modbus communication protocol
A.8 The inverter acts as a Modbus master
VFD500 can be used as a Modbus master station, it currently only supports broadcast network.
When P30.09 is set as 1, master mode can be enabled. The sending frame as master station is
as follows:
Instruction：
1. N indicates the slave register of the operation which is set by P30.10.
2. Val means the data sent, Val = (ValH << 8) + ValL, the function code P30.11 is to select the
contents of the data sent.
3. The idle time between frame and frame is set by function code P30.12.
The contents of the two registers need to be combined into
32-bit numbers.
For example, read the meter r16.00:
Step 1: Read 2 registers from the starting address 0x1000
Step 2: Watt-hour meter reading = ((Uint32)0x1001
value<<16) + 0x1000 value
Similar to 32-bit unsigned numbers. The value of the even
address is still the lower 16 bits, and the value of the next
address (odd number) of the even address indicates the
upper 16 bits.
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