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<== Date ==> | <== Thread ==> |
---|
Subject: | RE: USB ADC/DACs |
From: | "Pawel Kowalski - BiRa Systems Inc." <[email protected]> |
To: | "'Eric Norum'" <[email protected]> |
Cc: | [email protected] |
Date: | Wed, 5 May 2010 10:37:11 -0600 |
Thank you Eric, The reason I want to do USB is so that I can connect it directly
to a mini linux computer without needing an additional Ethernet port. Then this
mini pc will have epics IOC running on it which will interface to the USB
DAC/ADC and can then be accessed over Ethernet using process variables. The link you sent looks interesting but I think 0-10V would be
better since that’s the standard a number of power supplies seem to use. Any
other suggestions would be appreciated. ------------------------------------ Pawel Kowalski BiRa Systems Inc. Phone: 505-881-8887 Fax: 505-888-0651 Address: 2410
Midtown PL NE STE A Albuquerque
NM 87107 USA From: Eric Norum
[mailto:[email protected]] I'm surprised that you're hearing more requests for USB
connections than for ethernet. The latter allows for much longer
connections and is better supported by EPICS/ASYN. In any case, a small PLC sounds like it would take care of
this just fine. How about something like (only 0 to 5V, but perhaps that's
good enough): Adding an FTDI USB/Serial adapter adds about $20.00 There are small PLCs in this price range with Ethernet, too. On May 5, 2010, at 8:35 AM, Pawel Kowalski - BiRa Systems
Inc. wrote:
Hello, Based
on feedback I got at the beam and instrumentation workshop this week I am
trying to come up with a simple and cheap design to control analog power
supplies. Nothing is set in stone and I just want to find what we would need to
get to make this controller. I am trying to find a DAC/ADC that can be
connected using USB to a soft-ioc running linux. I don’t need a lot of
channels, 1 analog in and 1 analog out would be fine (2 of each would be
preferred) and having a couple digital in/digital out channels would be nice
too (but not required). The voltage will be 0-10V (if a bipolar DAC/ADC is
available that would be great). I would probably need to have at least 16 bits
of resolution on the DAC/ADC. The speed doesn’t have to be terribly fast
from what I gathered. Cost is an issue (trying to stay under $200) but if
something is out there that costs more than this I would like to take a look at
it anyway. I
wonder if anyone in the epics community has worked with such a device and if
they have epics drivers available. If epics drivers aren’t available I
can probably configure something myself using ASYN if someone can point me to a
good reliable device. Any suggestions would be greatly appreciated, thank you. ------------------------------------ Pawel
Kowalski BiRa
Systems Inc. Phone:
505-881-8887 Fax:
505-888-0651 Address:
2410 Midtown PL NE STE A Albuquerque NM 87107 USA -- |