Dennis Windisch wrote: > I would like to establish a real-time network connection between two PCs. > PC1 runs on Linux/RTAI/RTnet and PC2 on VxWorks. The goal is to make > real-time communication between those two PCs. > The problem is that I have to take PC2s configuration as it is, I can't run > it on Linux/RTAI/RTnet too. > > My question is if it is possible to make real-time networking (data > transfer) between those two PCs. >
That depends on what kind of realtime quality you are looking for and what guarantees VxWorks provides. Does the VxWorks network stack guarantee resource availability (e.g. packet buffers) in a hard or a soft RT way? Does it give you full control over what packets are transmitted and when? BTW, what protocol do you want to / have to use? RTnet can offer you deterministic packet transmission and reception via UDP/IP or self-defined Ethernet protocols - but only if the traffic on the medium is deterministic. So, other network participants must not send out packets in a non-predictable way, or you have to live with occasional disturbances (which may cause deadline misses if your timing is tight). You don't have to implement RTmac/TDMA on the VxWorks side in a cross-connect scenario like this, but you have to make sure that the other side only sends out a known workload because your RTAI side will otherwise suffer from the indeterminism as well. Jan
signature.asc
Description: OpenPGP digital signature
