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OIT***-F113-B12-CB*
Communicating with the OIT system
Calculating the Checksum
The individual bytes of the data telegram (byte 0 to byte 10) are calculated with
the XOR function. The resulting value is then transmitted as a checksum. The
receiver of this data telegram can also calculate a checksum using the data and
compare this checksum with the checksum transmitted by the sender. If the two
checksums are not identical, a transmission error has occurred.
Definition x = unsigned byte
X =
X =
X =
...
X =
X =
Byte 11 = checksum value X
7.4
TCP/IP communication over web browser
The OIT system contains a web browser that can be accessed over a normal
interface. The web browser includes:
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■
■
■
Permanently–set parameters:
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■
■
■
■
Launching the browser does not require a password. No data can be changed
and transferred to the internal server over the web browser.
34
Byte 0
XOR
X
XOR
X
XOR
X
XOR
X
XOR
Last image: Displays last image processed .
Last error image: Displays last error image.
History: Displays history
Results: statistical evaluation of reads and read errors in the last
days/weeks/months and total.
OIT: OIT system information
Decoding (Image capturing / Inspection): Image capture and testing
information.
Ethernet:Network connections.information
Communication: TSAP_Host and TSAP_OIT.information
Data telegram layout (SPS / OIT):OIT telegram and control telegram
settings information
Byte 1
Byte 2
Byte 3
Byte 9
Byte 10
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