LiteOn EVO 6800 Series, Manual

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11.6 Example of Reading / Responding Data
The following are examples of command and response data.
Example: For the drive address 01H, To read 2 consecutive register data for the drive address
01H, the message is “starting address 2422H.
ASCII Scheme:
Command Message: Respond Message:
STX ‘: ’ STX ‘: ’
Address
‘0’
Address
‘0’
‘1’ ‘1’
Function
‘0’
Function
‘0’
‘3’ ‘3’
Starting address
‘2’ Number of data
(count by byte)
‘0’
‘4’ ‘4’
‘2’
Content of address 2422H
‘1’
‘2’ ‘7’
Number of data
(count by word)
‘0’ ‘7’
‘0’ ‘0’
‘0’
Content of address 2423H
‘0’
‘2’ ‘0’
LRC Check
‘B’ ‘0’
‘4’ ‘0’
END
CR
LRC Check
‘7’
LF ‘1’
END
CR
LF
RTU Scheme:
Command Message: Respond Message:
Address 01H Address 01H
Function 03H Function 03H
Starting data address 24H Number of data 04H