- From: Caleb Tennis <caleb_at_aei-tech.com>
- Date: Wed, 5 Feb 2003 07:55:13 -0500
> We are looking to construct a data acquisition system that would have to > acq. data from 100-400 channels of (slow period) analog values. > > What is the general or specific experience folks have had with > platforms/hardware for this type of application? > > Single and differential acq. would be nice. As would use under Linux or > other unix variant (linux preferred...). For economic reasons I assume you'll want to use some kind of multiplexed device to accomodate that many channels. We use National Instruments's SCXI modules, which combine 32 channels into one multiplexed module, and you can span multiple modules inside a chassis. We use comedi with the SCXI patch and some other hacks in order to make the system aquire as desired. SCXI is a bit pricy, but definitely less expensive than attempting to buy standalone DAQ cards to support big channel counts. You may also want to look at NI's Fieldpoint, or Automation Direct's Field IO. They are scalable modules that you can chain together to get the desired # of channels, and they talk back to a computer either using Modbus, Devicenet, Ethernet, etc. We also use them (the Field IO) with linux using RS485 cards. I hope that gets you started. Feel free to contact me if you have more questions. Caleb
Received on 2003-02-05Z12:55:13