
19
9165
201
3-
06
34
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.
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:
■
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.
Permanently
–set parameters:
■
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
Launching the browser does not require a password. No data can be changed
and transferred to the internal server over the web browser.
Definition x = unsigned byte
X =
Byte 0
XOR
Byte 1
X =
X
XOR
Byte 2
X =
X
XOR
Byte 3
...
X =
X
XOR
Byte 9
X =
X
XOR
Byte 10
Byte 11 = checksum value X