Re: [foxboro] Modbus Multidrop
- From: "Johnson, Alex P \(IPS\)" <alex.johnson@xxxxxxxxxxxxxxxx>
- To: <foxboro@xxxxxxxxxxxxx>
- Date: Wed, 5 Sep 2007 20:50:36 -0400
I've normally used Black Box. Their free technical support is awesome.
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Regards,
Alex Johnson
Invensys Systems, Inc.
10900 Equity Drive
Houston, TX 77041
713.329.8472 (voice)
713.329.1700 (fax)
713.329.1600 (switchboard)
alex.johnson@xxxxxxxxxxxxxxxx
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]
On Behalf Of Airhart, Chad M.
Sent: Wednesday, September 05, 2007 2:36 PM
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] Modbus Multidrop
We have two Foxboro Integrator 30's for connection to devices with
Modbus. I now have to connect multiple devices to each Modbus
integrator so I want to do a multidrop for each. Each integrator
connects to a P0970VB configuration selector. The manual shows that
card going to a J478 or J878 modem then modbus bus connected to a J478
or J878 modem at each device. The only J478 or J878 modems I found on
the internet look like 1970's vintage boxes. How are you guys doing
multidrop (where each connected device is via RS-232) and with which
equipment (vendor/model numbers)? Looking for standard off the shelf
equipment if possible. Any help would be appreciated.
Chad M. Airhart
Principal Engineer - Lyondell Chemical Co.
Instrument, Electrical and Control Systems Engineering
Victoria Plant
Ph. (361)572-2568
Fx. (361)572-2541
Cell. (361)935-3230
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