Experimental Physics and
Industrial Control System

On 18:17 Thu 15 Jul , Mark Rivers wrote:

Shifu's device is a TCP/IP power supply, talking a simple ASCII
protocol.  When talking to the device it usually responds quickly, but
occasionally the responses are very delayed.  Whether this is due to the
device or to the APS network is not clear, but in any event sometimes
the response does not occur until after the 2 second timeout specified
in the devGpib file.  However, the device does appear to always
eventually reply.

I have similar problems with a few of my networked devices.
In my case, I believe this is due to broadcast packets.
A (logical or physical) point to point connection (device<->  IOC ) solve that problem.
I believe the broadcast packets are nothing less than the CA protocol itself ;-)
In a perfect world, one should have a network with OPIs and another network for controlled devices.
The IOCs are the bridges between both networks.

At APS, are controlled devices and OPIs on the same net?

Replies:

Re: devGpib problem Ralph Lange

References:

devGpib problem Mark Rivers

Re: devGpib problem emmanuel_mayssat

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