LSIS LSLV0055H100-4COFN - LS INV 485 Protocol

RS-485 Communication Features
360
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
NAK
Station ID
CMD
Error code
SUM
EOT
1 byte
2 bytes
1 byte
2 bytes
2 bytes
1 byte
• 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