What is remote frame in can bus

The so-called "remote frame" is a misunderstanding in traditional translation. Remote Frame actually means "remote control frame". The initiator initiates a remote frame with a specific ID and only sends the ID part. Then the terminal device that matches its ID is obliged to take over the control of the bus in the data part of the second half. Send your own data.
For example, the central control computer needs to obtain the data of a certain node regularly (such as the real-time speed of the tachometer, the real-time oil quantity of the fuel gauge, etc.), and can send a remote frame to the bus; the corresponding node is receiving and judging that the frame ID is consistent with itself , and in the case of a remote frame, it can send its own real-time data to the bus; in this way, the central control computer can obtain the real-time data of the relevant nodes.
The biggest advantage of remote frame is that it only takes one frame to complete a two-way interaction.