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Subject: | Asyn-based TCP/VXI-11 interface to many devices |
From: | Rod Nussbaumer <[email protected]> |
To: | epics Techtalk <[email protected]> |
Date: | Fri, 10 May 2013 09:43:23 -0700 |
Hi all.We are planning for installation of new beamlines requiring approximately 130 magnet power supplies. The proposed supplies (a few different manufacturers and models being considered) may be controlled using VXI-11/Telnet style interfaces, and using SCPI style commands. This implies the use of StreamDevice + Asyn interfaces in EPICS IOCs. My concern is about the scalability of ssyn with the large number of TCP connections to the power supplies. Each power supply will require an asyn IP port to be maintained. Until now, I have only configured asyn-based applications using 2 or 3 ports on a single IOC. This seems like a significant departure from what I consider a conventional system.
The IOC platform would probably be a VME hosted CPU running Linux, with an ethernet interface dedicated as a kind of VXI-11 fieldbus. It is possible, or likely, that control of the 130 supplies will be spread across 2 or 3 hardware IOC hosts.
Does anyone have any experience with this kind of configuration? Any problems to anticipate? Any problems that have known solutions? I am planning to try some kind of simulation using multiple physical hosts, possibly using multiple virtual hosts on each. Each host/virtual-host would simulate a power supply. Does this seem like a representative test?
Thanks. Rod Nussbaumer ISAC Controls, TRIUMF Vancouver, Canada