| Fri, 11 Jul 1997 14:15:12 -0400 |
| < Norm Dang norm.dang@hydro.on.ca> |
Hello Scada Newsgroup, Does anyone know of an inexpensive device that would take a single voltage quantity and encapsulate it in TCP/IP for transmission across a data network ? I have a single analog quantity that I want to transfer about 200 miles to an RTU. A dedicated data circuit is going to be fairly expensive and I would like to use an existing TCP/IP data network connection to transfer the data to the RTU location. At the RTU location, I would covert the data back into a voltage quantity. I have seen some custom implementations that use Microsoft NT boxes to do this work, but it seems to be overkill for just a single quantity. I figure that there must be a cheaper way to do this. Thanks in advance, Norm
| Fri, 11 Jul 97 16:46:22 -0700 |
| < David Gaw dgaw@coactive.com> |
You can do this with LonWorks and our LonTalk/IP router devices.
1. There are several manufacturers of analog input nodes for LonWorks networks (typical analog node costs $200-600 and usually has several inputs).
2. our Router-LE connects LonWorks to Ethernet TCP/IP (cost: about $1100). Our routers work across LANs or Internet links.
3. On the workstation side, you need to use an application that is aware of LonWorks. There are DDE Servers available, so that is an easy route to get data into your application. (Cost for DDE server is about $300-400.)
The nice thing about this solution is that you can add additional I/O by simply adding LonWorks nodes at the site. You can find more information on LonWorks at: http://www.echelon.com and more information on our products at http://www.coactive.com Please let me know if you have any questions. Sincerely, David Gaw
--- David Gaw (dgaw@coactive.com) Coactive Aesthetics, Inc. "Advanced Solutions for Distributed Control" 4000 Bridgeway, Suite 303 Sausalito, CA 94965 voice:(415)289-1727 fax:(415)289-1320 http://www.coactive.com