LS SV-iG5H Series, Manual, Page: 191 / 226

RS485 communication
177
Com
mu
nica
tion
11.5 Communication protocol (MODBUS-RTU)
Use Modbus-RTU protocol (Open protocol).
Computer or other hosts can be Master and inverters Slave. Inverter responds to
Read/Write command from Master.
Code Description
Function
Code
0x03 Read Hold Register
0x04 Read Input Register
0x06 Preset Single Register
0x10 Preset Multiple Register
Exception
Code
0x01 ILLEGAL FUNCTION
0x02 ILLEGAL DATA ADDRESS
0x03 ILLEGAL DATA VALUE
0x06 SLAVE DEVICE BUSY
User define 0x14
1.Write Disable (Address 0x0004 value is 0).
2.Read Only or Not Program during Running.
11.6 Communication protocol (LS BUS)
Basic format
Command message (Request):
Command message
(Request):
ENQ Drive No. CMD Data SUM EOT
1 byte 2 bytes 1 byte n bytes 2 bytes 1 byte
Normal response
(Acknowledge
Response)
ACK Drive No. CMD Data SUM EOT
1 byte 2 bytes 1 byte n * 4 bytes 2 bytes 1 byte
Negative response
(Negative Acknowledge
Response)
NAK Drive No. CMD Error code SUM EOT
1 byte 2 bytes 1 byte 2 bytes 2 bytes 1 byte