LSIS S100 User Manual

133
RS-485 Communication Features
5.3 Communication Protocol
The built-in RS-485 communication supports LS INV 485 and Modbus-RTU protocols.
5.3.1 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
• Data: ASCII-HEX (for example, when the data value is 3000: 3000 → ‘0’’B’’B’’8’h → 30h 42h
42h 38h)
• Error code: ASCII-HEX (refer to 5.3.1.4 Error Code on page 137
)

LSIS S100 Specifications

General

Brand	LSIS
Model	S100
Category	DC Drives
Language	English