CRIO 9853: Why the mask is required to send and receive extended frame CAN (J1939)?
I develop application RT who communicate with device of CAN frames extended through CRIO and 9853 CAN module with J1939 Protocol.
I look at Protocol J1939 example of reference to help me in my project.
Everything works fine, but I want to know why when I use the 9853 Module I need to use the bitmask (AND 0x1FFFFFFF to READ and OR write 0x20000000)
As you can see on the example of OR... (to WRITE)
Therefore, use both mask the good CAN Frame ID on the network?
He's not blok me... but I would like to understand why I need to add this code...
Hope someone will have the answer.
Roman
Playback uses the 30 bit to indicate whether the ID is standard or extended. Otherwise, if you have received ID 0x0000000A, you don't know if it was std or extended. For higher numbers (> 11 bit), it's obvious, but the flag is set, without worrying if you don't need several branches.
Tags: NI Products
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