232
the condition of the same baud rate, and each information must be transported continuously.
1)
each byte format in RTU mode
Encoding system
：
8 bits binary, hexadecimal 0-9, A-F.
Data bits
：
1 bit of start bit, 8 bits of data (send from the lower bit), 1 bit of stop bit, optional parity check bit
(refer to bit sequence of RTU data frame ).
Error check zone
：
cyclic redundancy check (CRC)
。
2)
Bit sequence of RTU data frame
With parity check
Start
1
2
3
4
5
6
7
8
Par
Stop
Without parity check
Start
1
2
3
4
5
6
7
8
Stop
5.2 Register Address and Function Code
1) supported function code
Function code
Function description
03
Read multiple registers
06
Write single register
10
Write multiple registers continuously
13
Read single parameter
2) register address
Register function
Address
Control command input
0x2000
Read monitor parameter
0xD000
（
0x1D00
）～
0xD039
（
0x1D39
）
MODBUS frequency setting
0x2001
MODBUS torque setting
0x2002
MODBUS PID frequency given
0x2003
