AcroPack Series AP560
CAN Bus Interface Module
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Remote Frame
The remote frame is shown in Figure 4. The function of remote frames is to
allow a receiver which periodically receives certain types of data to request
that data from the transmitting source. The identifier of the remote frame
must be identical to the identifier of the requested transmitting node’s data
frame and the data length code (DLC) should be equal to the DLC of the
requested data.
Simultaneous transmission of remote frames with the same
identifier and different DLCs will lead to unresolvable collisions on the bus.
For this reason, ARINC 825 strongly discourages the use of remote frames.
The format of a remote frame is identical to the format of the corresponding
data frame except the remote frame has no data payload. Remote frames and
data frames are distinguished by a recessive RTR bit in the remote frame. This
means if a receiver sends a remote frame and the sending node transmits at
the same time, the sending node (with a dominant RTR bit) will win
arbitration and the requesting node will receive the desired data immediately.
Summary of Contents for AcroPack AP560
Page 28: ...AcroPack Series AP560 CAN Bus Interface Module 28 Figure 2 Standard Data Frame...
Page 30: ...AcroPack Series AP560 CAN Bus Interface Module 30 Figure 3 Extended Data Frame...
Page 32: ...AcroPack Series AP560 CAN Bus Interface Module 32 Figure 4 Remote Frame...
Page 34: ...AcroPack Series AP560 CAN Bus Interface Module 34 Figure 5 Error Frame...
