LSIS 6731001500, User Manual

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RS-485 Communication Features
7.3.6 LS INV 485 Protocol
The slave device (inverter) responds to read and write requests from the master device (PLC or PC).
Request
ENQ Station ID CMD Data SUM EOT
1 byte 2 bytes 1 byte n bytes 2 bytes 1 byte
Normal Response
ACK Station ID CMD Data SUM EOT
1 byte 2 bytes 1 byte n x 4 bytes 2 bytes 1 byte
Error Response
•
A request starts with ENQ and ends with EOT.
•
A normal response starts with ACK and ends with EOT.
•
An error response starts with NAK and ends with EOT.
•
A station ID indicates the inverter number and is displayed as a two-byte ASCII-HEX string
that uses characters 0-9 and A-F.
•
CMD: Uses uppercase characters (returns an IF error if lowercase characters are
encountered)—please refer to the following table.
Character ASCII-HEX Command
‘R’ 52h Read
‘W’ 57h Write
‘X’ 58h Request monitor registration
‘Y’ 59h Perform monitor registration
NAK Station ID CMD Error code SUM EOT
1 byte 2 bytes 1 byte 2 bytes 2 bytes 1 byte