Shenzhen Hpmont Technology Co., Ltd Appendix C Communication Protocol
HD30 Series Inverters User Manual －157－
Appendix C Communication Protocol
1. Peripherals Support
HD30 series Inverters provide two RS485 communication interfaces which both use the standard
MODBUS communication protocol. By using the host computer (including communication
devices such as computer and PLC) the user can operate to read-write the inverter’s function
code, read the status parameters and write the control command etc. The inverter is in slave
mode when it is communicating.
2. Interfaces
1. Interface mode and pin definition
Definition of the RJ45 pin signal
Pin 1 2 3 4 5 6 7 8
Signal +5V 485+ +5V GND GND GND 485- Reserved
2. Communication mode
RS485 interface: asynchronous, semi-duplex.
Default: 8-N-2, 9600bps.
3. Network Mode
4. Protocol Format
The MODBUS protocol simultaneously supports RTU mode and ASCII mode, with corresponding
frame format as shown below:
PCmaster
PLCmaster
RS232/RS485
switching module
HD30
HD30 HD30
Single-master andmulti-slave
RS485
PCmaster
PLCmaster
RS232/RS485
switching module
HD30, HD30
Single-master andsingle-slave
RS485
HD30, HD30
C
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