sCAN_UserManual_Eng_DM_v1.2.1

sCAN User Manual
23
10. Reference
10.1. Mask
At the CAN communication, in general, it combines receiving ID and receiving mask ID to filter the CAN frame to be
seen on the CAN network, thereby controlling the processing loads for communication.
Receiving ID is to present the CAN frame ID to be seen, whereas the receiving Mask ID is to check all receive data
are consistent the bits of the receiving ID previously set. If it’s consistent, the data is received but if not, it is not
received.
10.2. DAR(Disable Automatic Retransmit)
In CAN communication, in general, the device sends the CAN frame and then resend it if errors have occurred in
other CAN device, thereby ensuring the data integrity.
However, this may cause over-loads in the communication and delays in sending due to pushed-back priority. For
such as the DAR (Disable Automatic Retransmit) function is activated and operated to reduce the communication
loads and also prevent the delays in communication attributed to pushed-back priority. However, problems may be
caused due to failure in sending to other CAN device by the errors in sending.
10.3. ABOR(Automatic Bus-Off Recovery)
In CAN communication, the error frame is spread through the entire CAN network; therefore, the errors are to be
frequently occurred on a device which contributes to overloads of communication and instability in the entire network.
In order avoids such problem, the CAN communication itself separates from the CAN network once the TEC (Transmit
Error Count) and REC (Receive Error Count) are increased to a certain level, ultimately reducing the effects on other
CAN device and network. Here, the device itself doesn’t send to or received from CAN network. Rebooting is required
in order to recover it. If ABOR (Automatic Bus-Off Recovery) is being activated, it will be automatically recovered
without rebooting. However if activated, the communication loads and instability of entire network may be continued.