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Appendix A Modbus Communication Protocol
138
Read the operating frequency of No.1 inverter and the response operating frequency of the inverter is 50.00Hz:
Address
Function
code
Register
Address
Number
Bytes
Register
Contents
Request
0x01
0x03
0x8136
0x0001
None
0x4C38
Response
0x01
0x03
None
0x02
0x1388
0xB512
No.1 inverter stops in the default mode:
Address
Function
code
Register
Address
Register Contents
Check Sum
Request
0x01
0x06
0x8000
0x0000
0xA00A
Response
0x01
0x06
0x8000
0x0000
0xA00A
Note:
It needs to set P0.06 to 2 firstly.
8. Communication Network Construction
Connecting one inverter to the computer
Computer
Converter RS232-485
RS232 cable
Maximum 15
meters
Site No.1
GND 485+ 485-
Twisted pair with shielded
GND
Attached Fig.3 Connecting One Inverter to the Computer
Connecting multiple inverters to the computer
The switch of terminal resistor of
the inverter at the most distant
p l a c e i d t u r n t o O N , s t a r t , t h e
internal 100
Ω
terminal compatible
resistance
Site No. 2
Site No. n
Computer
converter RS232-485
RS232
cable
Maximum
15 meters
Site No. 1
GND 485+ 485-
With shielded twisted pair
GND
GND 485+ 485-
GND 485+ 485-
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