CAN-8x23 user’s manual (Revision 3.20, Ma r/08/2012) ------
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RTR-only asynchronous
The asynchronous mode is independent of the SYNC object. This mode
can also be divided into two parts. There are RTR-only asynchronous
transmission type and asynchronous transmission type. The RTR-only
transmission type is only for supporting TxPDO transmissions , only triggered
by receiving the RTR object from the PDO consumer. This action is depicted
below.