CAN-8123/CAN-8223/CAN-8423 user’s manual (Revision 3.00, May/22/2009) ------
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Remote Request
The PDO transmission can be triggered by receiving a remote request
from any other PDO consumer with under the asynchronous or RTR setting.
PDO Transmission Types
Generally there are two kinds of PDO transmission modes, synchronous
and asynchronous. For the PDO in a synchronous mode, it must be triggered
by the reception of a SYNC message.
The synchronous mode can be further distinguished into three kinds of
transmission(s), acyclic synchronous, cyclic synchronous and RTR-only
synchronous. The acyclic synchronous can be triggered by both the reception
of a SYNC message and the driven event mentioned above.