Hardware Manual COMBILOG 1020
109
Note:
In the ASCII-protocol T
2max
is at least
12 msec. The values for T
2min
and T
3max
and the behaviour of the
datalogger if the time T
3max
is exceeded (communication timeout,
see also chapter 5.8, error handling) can be adjusted by means
of the configuration software
COMBILOG.EXE
. The default val-
ues for T
2min
is 1 CT and for T
3max
60 sec.
11.5.2
Telegram Format
For the request-and response telegrams the ASCII-protocol dis-
tinguishes between telegrams without and with check sum. The
telegrams are characterized with different start-delimiters (SD). A
request telegram without a check sum will lead to a response
telegram which also contains no check sum. The same applies to
for requests with check sum, accordingly. Furthermore there are
two short telegrams with the length of one character each to per-
form a positive or negative acknowledgement.
SD
DA
ReqDataUnit
ED
1
2
n
n+4 characters
request telegram without checksum:
1
SD
ResDataUnit
ED
1
n
n+2 characters
1
response telegram without checksum:
SD
DA ReqDataUnit
ED
1
2
n
2
n+6 characters
request telegram with check sum:
FCS
1
SD
ResDataUnit
ED
1
n
2
n+4 characters
response telegram with checksum:
FCS
1
ACK
1 character
Positive Acknowledge
NAK
1 character
Negative Acknowledge
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...