11-4
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.
Supported function code
Function code Description
0x03 Read Hold Register
0x04 Read Input Register
0x06 Preset Single Register
0x10 Preset Multiple Register
Exception code
Function code Description
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)
z Basic format
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
Description:
Request starts with “ENQ” and ends with “EOT”.
Acknowledge Response starts with “ACK” and ends with “EOT”.
Negative Acknowledge Response starts with ”NAK” and ends with “EOT”.
“Drive Number” is the number of drives and indicated in 2 bite ASCII-HEX.
(ASCII-HEX: Hexadecimal consists of ‘0’ ~ ‘9’, ‘A’ ~ ‘F)
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