I am working on finger-print lock system project. in order to interface r305(fingerprint sensor), I have to send and receive commands serially. but I do not know how to calculate checksum.on 10 pg of datasheet there is written that checksum is the arithmetic sum of package identifier, package length, and all package content. I searched a lot that how to calculate checksum but did not find anything. do anyone here know how to calculate it?
I have added r305 user manual.