Re: [foxboro] Modbus Multidrop

We are also using black boxes for connecting modbus devices in multidrop 
fashion and they are doing well in our applications.

Rgds,
Ali Ahmed Zahidi
Sr. Design & Application Engineer
Intech Process Automation, Inc.

----- Original Message ----- 
From: "Johnson, Alex P (IPS)" <alex.johnson@xxxxxxxxxxxxxxxx>
To: <foxboro@xxxxxxxxxxxxx>
Sent: Thursday, September 06, 2007 4:50 AM
Subject: Re: [foxboro] Modbus Multidrop


> I've normally used Black Box. Their free technical support is awesome.
> Just call them and they will tell you what you need.
>
> www.blackbox.com
>
> From their website: http://www.blackbox.com/Tech_Support/Index.aspx
>
>   Telephone:
>   724-746-5500
>   Answered in 20 seconds or less!
>
>   Fax:
>   800-321-0746
>   Answered in 15 minutes or less!
>
>   e-mail:
>   Send an e-mail.
>   Answered in 15 minutes or less!
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>   Online:
>   Talk to Tech
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> Who says there is no money in hardware? :)
>
>
> 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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