"Bjorn" wrote, variously: | | With "NC machine" I mean a CNC controlled milling machine, | for example. We have other milling machines that have a built in | Ethernet card, but one of the machines isn't possible to upgrade. | ... | In a Linux box I want something like |
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| > So I want to put a Linux PC close to my NC machine with only | > a short serial cable between them and hopefully get up to full | > serial speed, 115kbps. | > ...Well, long distance... it's about 35m but the environment contains | > lots of other noisy machinery that might disturb the signal....
Using a general-purpose machine running a general-purpose operating system just to tunnel an asynchronous serial connection over Ethernet/TCP/IP/Telnet is a lot of overhead.
While the "serial-ethernet" devices from "ipcas GmBH" (at the above URL) appear, at first glance, to be uncomfortably Windows-centric to a Linux guy, another vendor has a similar idea.
Lantronix makes several simple, little, plug-and-go products. Several of them are intended precisely for industrial automation:
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One of them can use a fiber-optic Ethernet medium for noise immunity:
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On the other hand, some potentially useful Linux-based software is visible here:
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