LSIS XDL-L7SA002X

6. Communication Protocol
6-5
6.2.2 Protocol Command Codes
(1) Read Single Register (0x03)
Read the single register (16-bit data) value.
Sending Packet Normal Receiving Packet
Byte Content Value Byte Content Value
0
Node ID
0x00 0
Node ID
0x00
1 Function 0x03 1 Function 0x03
2 Starting Address Hi 0x00 2 Byte Count 0x02
3 Starting Address Lo 0x6B 3 Register Value Hi 0x02
4 Quantity of Register Hi 0x00 4 Register Value Lo 0x2B
5 Quantity of Register Lo 0x01 5 CRC Hi
6 CRC Hi 6 CRC Lo
7 CRC Lo
Error Receiving Packet
Byte Content Value
0 Node ID 0x00
1 Error Code 0x03 + 0x80
2 Exception Code 0x01 ~ 0x04
3 CRC Hi
4 CRC Lo
Example)