What is the difference between broadcast and polled CAN parameters?
Broadcast parameters are transmitted regularly on a CAN network by the ECU that senses and generates the information. This information can be read by the CANgate without disturbing the operating of the network. This is commonly known as “sniffing” data on the network. Broadcasting information can be an efficient way of transmitting parameter data, particularly when there are multiple consumers of the data. The SAE J1939 defines many parameters that are broadcast on the network. Polled parameters must be requested. The CANgate can poll parameters when the particular protocol is known, such as SAE J1939 or OBD-II. Polled parameters require the CANgate to send and receive CAN frames to obtain the data. As such it is an intrusive process on the CAN network as it add’s more traffic to the network. Care should be taken to avoid overloading a CAN network with too many requests for polled parameters.
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