Hardware Manual COMBILOG 1020
121
SD:
Start-Delimiter (length = 1 byte):
The Start-Delimiter SD identifies the beginning of a telegram. It
can assume the following values in the PROFIBUS-protocol:
telegram
format
request telegram response telegram data field length
SD1
hex 10
hex 10
0
SD2
hex 68
hex 68
1 ... 246 (32)
SD3
hex A2
hex A2
8
Table 11.12 Start-Delimiter (SD) in the PROFIBUS-protocol
LE:
Length (length = 1 byte):
The Length LE identifies the length of the telegram with variable
data field length (SD2-telegram) and comprises the characters
from DA to DataUnit. Thus it corresponds to the length of
D3 and can have values between 4 and 249. In the
PROFIBUS-DP-protocol the length of the data field is generally
limited to 32 bytes. Since the datalogger has no telegrams with a
usable data length of more than 32 bytes, the datalogger
can also
be integrated in bus topologies with DP-protocol.
LEr:
Length-Repeated (length = 1 byte):
The Length-Repeated LEr corresponds to the specification
Length LE. It is stated again in the telegram for data protection
control purposes.
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...