This can be used as a quick reference to lookup which CAN frame identifiers will be caught by a certain mask and filter. It supports 11-bit CAN 2.0A and 29-bit CAN 2.0B.
This webpage explains how it works:
/.../ A receiving node would examine the identifier to decide if it was relevant (e.g. waiting for a frame with ID 00001567 which contains data to switch on or off a motor). It could do this via software (using a C if or case statement); in practice the Canbus interface contains firmware to carry out this task using the acceptance filter and mask value to filter out unwanted messages. The filter mask is used to determine which bits in the identifier of the received frame are compared with the filter
- If a mask bit is set to a zero, the corresponding ID bit will automatically be accepted, regardless of the value of the filter bit.
- If a mask bit is set to a one, the corresponding ID bit will be compare with the value of the filter bit; if they match it is accepted otherwise the frame is rejected.