Nidec NE200-4T0040G/0055PB - Appendix B: Modbus Communication Protocol

NE200/300 Series Drive User Manual
204 Appendix A Modbus Communication Protocol
Appendix B: Modbus Communication Protocol
The drive support Modbus protocol, RTU format, Broadcast address 0,
slave address “1-247”. Interface mode: RS485: Asynchronous, half duplex.
Note: ③ means only for NE300.
1. Protocol Format
Start
The initial space of frame is 3.5
characters or above
Slave address 1～247
Function Code
03: Read parameters from slave
06: Write parameters to slave
08: Loopback Test
Data(N)
2×N data, this is the main content
of Modbus communication.
………
Data(0)
Error check CRC check
End
The End space of frame is 3.5
characters or above
2. Function Code and Data
Function Code 03H: Reads parameters and status words of one
parameters of the drive.
Example：Read parameter (register address: 0100H) from the slave 1,
the format is as follows:
The Master Request
Slave address 01H
Function code 03H
Register address Hi 01H