MoTeC Global Forum

Hi,

I am setting up some extra sensors over a CAN bus unit. These come with dedicated CAN adresses. Some of them are not 8 or 16 bit though, so not using a full byte. So I use the BIT mask function.

Now, when I have a 12bit channel that is transmitted on e.g. BYTE0 and BYTE1 (full byte 0, half of byte1) , then I use offset 0, length 2, and mask FFF0 but that doesn't work.

For the following 12bit channel (so using second half of BYTE1 and all of BYTE2) I use offset 1, length 2 and mask 0FFF and that works perfectly.

Any suggestions on what I might be doing wrong there?

What does "doesn't work" mean? What exactly is being sent (show us the bytes of the CAN packet), and what value is being received? What are the Multiplier / Divisor and Adder values?

Here is my guess: Did you divide by 16 to shift the data into the correct bit position?

good guess.

found that as well last night in a 2016 post here

viewtopic.php?f=70&t=3455

now all good. Thanks