On Mon, 29 Oct 2007, Jon Elson wrote:
> The idea is that 100 mbit/sec ethernet is fast. What other
> RS485 device do you have that runs that fast?
Of course a RS-485 link can have smaller packets, and may actually have much
better real time performance. (a single 10 MBps RS-485 link will have much
better performance than 100 BT Ethernet connected to a single encoder)
Also 100BT with its MLT3 encoding is not as electrically robust as isolated
RS-485 or 10BT.
Ethernet is great for broadcast but I don't think so good for collecting data
from a large number of separate real time devices (say encoders)
I think Ethernet would be a really good way to connect a multi channel motion
controller to a PC where the large packet size is not such nuisance. You would
likely need a separate Ethernet card from the main network connection.
Peter Wallace
Mesa Electronics
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