Dwyer UXF2 - Manual (Page 118)

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6.1.2. Message configuration
6.1.2.1. 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)
6.1.2.2. 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)
6.1.2.3. 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
6.1.3. 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-70