Dwyer UXF3 - Manual (Page 37)

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8.2 Message Configuration
8.2.1 Reception
Description Bytes Remarks
Start mark 1 : (3Ah)
Slave address (SLV) 2 01 to 31
Function code (F_CD) 4 See function code table.
Error check 2 LRC
1 CR (0Dh)
End mark
1 LF (0Ah)
8.2.2 Acknowledge
Description Bytes Remarks
Start mark 1 : (3Ah)
Slave address (SLV) 2 01 to 31
Function code (F_CD) 4 See function code table.
Data length (L) 2
Data 2L
Error check 2 LRC
1 CR (0Dh)
End mark
1 LF (0Ah)
8.2.3 Error acknowledge
Description Bytes Remarks
Start mark 1 : (3Ah)
Slave address (SLV) 2 01 to 31
Function code (F_CD) 4 See function code table.
Error data 2 See error data table.
Error check 2 LRC
1 CR (0Dh)
End mark
1 LF (0Ah)
Receive format : SLV F_CD LRC CR LF
Acknowledge format : SLV F_CD
Data
length
Data LRC CR LF
Error acknowledge
format
: SLV F_CD
Error
data
LRC CR LF
8.3 Error Check
Arrange the LRC so that the sum (carry not included) of all ASCII data excluding “:,” “CR” and “LF” will be 00h.
[LRC creation procedure]
(1) Add the data headed by the start mark (:) excluding the carry.
(2) Obtain 2's complement for the sum.
(3) Convert the 2's complement into ASCII (= LRC).
Bulletin F-107-UXF3-S