Baldor VS1MD, User Manual

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C-4
VS1MD User Manual
C.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.
C.6 Communication Protocol (LS Bus)
C.6.1 Basic Format
Command message (Request):
Normal response (Acknowledge Response):
Negative response (Negative Acknowledge Response):
Table C.1 – Supported function codes
Function code Description
0x03 Read Hold Register
0x04 Read Input Register
0x06 Preset Single Register
0x10 Preset Multiple Register
Table C.2 – Exception codes
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.
ENQ Drive No. CMD Data SUM EOT
1 byte 2 bytes 1 byte n bytes 2 bytes 1 byte
ACK Drive No. CMD Data SUM EOT
1 byte 2 bytes 1 byte n * 4 bytes 2 bytes 1 byte
NAK Drive No. CMD Error code SUM EOT
1 byte 2 bytes 1 byte 2 bytes 2 bytes 1 byte