4.3.1.2 Remote Frame
(Standard and extended format.) The remote frame is transmitted by a CAN controller to request the transmission of the data frame
with the same identifier (Figure 4-9). The remote frame is composed of seven fields, which include start of frame, arbitration field, con-
trol field, data field, CRC field, acknowledge field, and end of frame.
The remote frame is used when a CAN processor wishes to request data from another node. Sending a remote frame initiates a trans-
mission of data from a source node with the same identifier (masked groups included). The primary bit pattern difference between a
data frame and a remote frame is the RTR bit. In the remote frame, the RTR bit is sent as a recessive bit; in the data frame, the RTR bit
is sent as a dominant bit. Additionally, the remote frame does not contain a data field, independent of the programmed values in the
DTBYC3:DTBYC0 bits in the respective CAN message format register.
Figure 4-9. Remote Frame
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