CAN-8123/CAN-8223/CAN-8423 user’s manual (Revision 3.00, May/22/2009) ------
101
5.2.2 Transmission
Type
The transmission type is one of the several parameters defined in PDO
communication objects with sub-index 02. Each PDO has its own transmission
type. The transmission type can indicate the transmission or reception
character for its corresponding PDO. The following table describes the
relationship between the value of the transmission type and the PDO character.
For example, if users used transmission type 0 for the first TxPDO, the
CANopen device will follow the rule of the acyclic and synchronous PDO
transmission.
PDO Transmission method
Transmission
Type
cyclic
acyclic
synchronous asynchronous
RTR
only
0
O
O
1-240
O
O
241-251
-------------------------
reversed
-------------------------
252
O
O
253
O
O
254
O
255
O
Note:
1. The transmission type 1-240 indicates how many SYNC objects the TxPDO
will be triggered. The RxPDO is always triggered by the following SYNC
upon reception of data independent of the transmission types 0-240.
2. The transmission type 252 and 253 are only used for TxPDO. The
transmission type 252 means that the data is updated (but not sent)
immediately after reception of the SYNC object. For these two transmission
types, the PDO is only transmitted on remote transmission requests.
3. For the transmission types 254 and 255, the event timer will be used in the
TxPDO. The PDO, including the DI value, will be sent when the DI value is
changed. And both transmission types will directly trigger an update of the
mapped data when receiving the RxPDO.