Remote frame in CAN bus....

[Emb4U]

In remote frame means one node will send the request for knowing about the status of another node. then that node will send a remote frame.
My question is in that CAN Remote frame the node sends whose identifier in frame ?

Means if he send sender's ID then why and recievers ID then why ?

Kindly suggest me some answar.

 

[FvM]

Means if he send sender's ID then why and recievers ID then why ?

CAN IDs are neither sender nor receiver IDs. They are message IDs. It's a matter of application layer to associate specific IDs with stations.

Example:
In a CAN application, ID 1234 has been assigned to the status of station A (e.g. setpoint, speed and error state of a VFD inverter). Station A might either send an ID 1234 message repeatedly, or after a remote message with ID 1234.

 

[Emb4U]

Dear FVM sir just think that there is 4 nodes in a CAN bus.(node A, B,C,D)

If node A want to know the status of node C.

If node A sends the message ID of node C through remote frame then how will node C know that which node sends a request to know the status of node C.

Kindly help me..

 

[FvM]

how will node C know that which node sends a request to know the status of node C.

Node C don't need to know. Just answers the remote frame.

 

[Emb4U]

Node C don't need to know. Just answers the remote frame.

If it happens then node C sends data on whose ID as the answar of remote frame.

Help me please

 

[FvM]

What do you mean with "whos ID"? IDs are assigned to specific messages, not nodes. See my example in post #2.

Send a remote message with ID 1234, get an answer with the same ID.

 

[Emb4U]

Sorry SIr,, I understood completely.

Thank you