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Annexe 3
Protocole de communication Modbus
1. Communication Data Frame
BDI50 series inverter can be controlled by a PC or other controller with the Communication
protocol, Modbus ASCII Mode & Mode RTU, RS485 or RS232. Frame length maximum 80
bytes.
1.1 Hardware installation
controller
(PLC / HMI or
PC)
RS-485
Interface
Response
Request
120Ω
1/4w
** The network is terminated at each end with an external terminating resistor (120Ω， 1/4w)**
1.2 Data format ASCII MODE
STX(3AH)
Address Hi
Address Lo
Function Hi
Function Lo
Command Start Address
Command Start Address
Command Start Address
Command Start Address
Data length
Data length
Data length
Data length
LRC Check Hi
LRC Check Lo
END Hi
END Lo
Protocole de communication BDI50
Slave BDI50
Slave BDI50
Station 01
Option Card
Option Card
A
B
Start bit = 3AH
Communication Address(Station):
2-digit ASCII Code
Function Code (command):
2-digit ASCII Code
Command Start byte:
4-digit ASCII Code
The length of the command:
4-digit ASCII Code
LRC Check Code:
2-digit ASCII Code
End Byte :
END Hi = CR(0DH), END Lo= LF(0AH)
Slave BDI50
Station 02
Station 03
Option Card
A
B
A
App 3-1
Option Card
B
Slave BDI50
Station FE
A
B
120Ω
1/4w
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