VM1000 Series
‐114‐
parameters
DATA（N-1）
Data content：
Para address of function code，parameter bit of function
code，parameter value of function code
DATA（N-2）
……
DATA0
CRCCHK High Bit
Detection value：CRC
CRCCHK Low Bit
END Time of 3.5 character
Table 6-1 RTU Format
Reading the Data from Auxiliary Register:
Example 1: The slave address is the start address of 01VFD, F002 continuously
read two consecutive values.
Command Information of the Host:
ADR 01H
CMD 03H
High bit of starting address F0H
Low bit of starting address 02H
High bit of register number 00H
Low bit of register number 02H
CRCCHK low bit
The CPCCHK is still need to be calculated
CRCCHK high bit
Table 6-2 The Host Reading Command Frame Format
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