HV350 Mini Frequency Inverter User Manual
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Appendix A Communication Protocol
1.Application range
Universal Variable Speed Drive connects with PLC or host computer via
RS485 bus, which adopts single master and multi-slave network structure.
2. Physical description
Interface: RS485 Bus, asynchronous, half-duplex
Each segment on the network bus can have up to 32 stations.
2.1. Data format
0: 8,N,2 for RTU （MODBUS）(Default)
1: 8,E,1 for RTU （MODBUS）
2: 8,O,1 for RTU （MODBUS）
3: 7,N,2 for ASCII （MODBUS）
4: 7,E,1 for ASCII （MODBUS）
5: 7,O,1 for ASCII （MODBUS）
6： 8,N,1 free communication format
7： 8,E,1 free communication format
8： 8,O,1 free communication format
2.2. Baud rate
Available baud rate: 1200, 2400, 4800, 9600, 19200, 38400
The default value is 9600 BPS.
2.3. Communication address
Slave address range: 1~32
2.4. Communication mode
The drive works as slave, and PLC or host computer works as master.
Communication of master is polling, and the slave is in response mode.
2.5 Main function
a. Operation control:
Run, Stop, Jog start, Jog stop, free run to stop, Dec to Stop, fault reset,
