Instrument Control (GPIB, Serial, VISA, IVI)

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Need help to identify checksum for rs232

Hi all,

my problem is very tricky.
I have some Hex protocols of the communication with a controller. You will find Exampels of protocols attached.

What kind of alghorithm is working to genereate the right checksum?

Hex_BB.txt Checksum = $BB
Hex_21.txt Checksum = $21
Hex_37.txt Checksum = $37
Hex_49.txt Checksum = $49
Hex_A8.txt Checksum = $A8
Hex_B6.txt Checksum = $B6

!!! a sixpack Beer for solution !!!
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What type of controller? No chance to ask the manufactur?
 
Greetings from Germany
Henrik

LV since v3.1

“ground” is a convenient fantasy

'˙˙˙˙uıɐƃɐ lɐıp puɐ °06 ǝuoɥd ɹnoʎ uɹnʇ ǝsɐǝld 'ʎɹɐuıƃɐɯı sı pǝlɐıp ǝʌɐɥ noʎ ɹǝqɯnu ǝɥʇ'


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