Fan Speeds wrong on MX503

[legit]

Hey all,
So i have a MX503(vk204-24) display and am trying to read the fan speeds however i can't seem to get the right speeds. Every time i read the device using 254 193 2 I get -776 for the ran speed even if i change the fan speed it stays the same, any suggestions on how to read this value correctly?
thanks
- legit

PS. all the other values in the packet are what they should be.

[Jeroen Vonk]

Every time i read the device using 254 193 2 I get -776 for the ran speed even if i change the fan speed it stays the same, any suggestions on how to read this value correctly?

Which calculation do you use to get the -776? (I think you calculate the RPM wrong or use a wrong integer type, because as far as I know it is nog possible to get negative RPM values)

What are the values of the complete packet? (all 7 bytes)