No idea what the WMII does for a checksum. Possibilities 1. A simple XOR'ing of the bytes. But, this would leave you with a 1 byte checksum, and it seems the WMII uses 2 bytes. I don't think they would XOR 2 bytes at a time, because then you would have to worry about the "endianness" of the machine you're running on. 2. Much more likely, it's the same algorithm used by the Davis Vantage series. See the implementation in the file weewx/crc16.py <https://github.com/weewx/weewx/blob/master/bin/weewx/crc16.py>.
-tk On Tue, Sep 3, 2019 at 9:16 AM William Webb <billweb...@gmail.com> wrote: > I see in the Davis Monitor II driver how to get the two byte checksum from > the weather station. Can you point me to an example of how to calculate the > checksum from the data bytes for comparison? A Python example would > probably give me enough information to modify the driver. > > -- > You received this message because you are subscribed to the Google Groups > "weewx-user" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to weewx-user+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/weewx-user/3102da13-fda4-4842-aac0-96897e8515ee%40googlegroups.com > . > -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to weewx-user+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/CAPq0zEAbZ-46MwRwvtHLm3Ey7AnsZndD3bw3poFX4nNenzskVQ%40mail.gmail.com.
