Hardware Manual COMBILOG 1020
111
FCS:
Frame-Check-Sequence (length = 2 byte):
The Frame-Check-Sequence FCS identifies the running digital
sum of the telegram. This is the sum of the ASCII-values in the
telegram
modulo
256. It is calculated in the ASCII-protocol from
Start-Delimiter (SD), Destination Address (DA) and Data-Unit:
CheckSum_ASCII = [SD+DA+DataUnit]
mod
256. In the ASCII-
protocol the value is given as a two-digit ASCII-string (ASCII
"00"..."FF").
ED:
End-Delimiter (length = 1 byte):
The End-Delimiter ED identifies the end of the telegram. In an
ASCII-protocol it has the value
hex
0D ("Cr").
ACK:
Acknowledge (length = 1 byte):
With a request, where no data are returned, the correct execution
of the instruction is acknowledged by an "Acknowledge"-
character (
hex
06).
NAK:
No-Acknowledge (length = 1 byte):
When a request has not been performed correctly, a "No Ac-
knowledge" (
hex
15) is sent back.
Summary of Contents for COMBILOG 1020
Page 1: ...COMBILOG 1020 Datalogger Hardware Manual Version 3 09...
Page 2: ...Hardware Manual COMBILOG 1020 2 Issue 03 11 2005 Technical data are subject to change...
Page 4: ...Hardware Manual COMBILOG 1020 4...
Page 6: ...Hardware Manual COMBILOG 1020 6...
Page 12: ...Hardware Manual COMBILOG 1020 12...
Page 86: ...Hardware Manual COMBILOG 1020 86 Bild 8 1 Example Master Slave System...
Page 169: ...Hardware Manual COMBILOG 1020 169...
Page 170: ...Hardware Manual COMBILOG 1020 170...