Help me for checksum....

[madcobra]

Dear my friend,

I using Block camera with Rs232 for controller zoom and wide. I want to write program in Labview for this. They protocol looklike

DEFAULT is 19200bps.Data Length: 8 bit Start Bit: 1 bit Stop Bit: 1 bit Parity: None Flow Control: None

Checksum format :

Bit 0-6: Take the value that sets the lower 7 bits of the values added from the header to the checksum to 0.

Bit 7: Fixed [0]

Command for Zoom is A0 02 05 CS FF (A0 is header , 02 05 is message, CS Checksum, FF is teminal ) ( Checksum is 27, right ? A0 02 05 27 FF )

Wide A0 02 06 CS FF

Zoom, Wide Stop A0 02 07 CS FF

Please help me calculate Checksum in Labview 8.5

Thanks alot

Jean Martin

[crossrulz]

Assuming I'm understanding your checksum protocol correctly, this should do the trick.

[madcobra]

Assuming I'm understanding your checksum protocol correctly, this should do the trick.

Thanks alot Crossrulz.

[crossrulz]

Just quickly thinking about it again (after reading the RSS), the masking (AND) should be done last (after the summing). Sorry for the lapse in logic.