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! > > Online: > Talk to Tech > Answered in 20 seconds or less! > > > 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 > > > > > _______________________________________________________________________ > This mailing list is neither sponsored nor endorsed by Invensys Process > Systems (formerly The Foxboro Company). Use the info you obtain here at > your own risks. Read http://www.thecassandraproject.org/disclaimer.html > > foxboro mailing list: //www.freelists.org/list/foxboro > to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=3Djoin > to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=3Dleave > > > > Confidentiality Notice: > This e-mail and any associated files are intended solely for the > individual= > or entity to whom they are addressed. Please do not copy it or use it for > = > any purposes, or disclose its contents to any other person. Further, this > e= > -mail and any associated files may be confidential and further may be > legal= > ly privileged. This email is from the Invensys Process Systems business > uni= > t of Invensys plc which is a company registered in England and Wales with > i= > ts registered office at Portland House, Bressenden Place, London, SW1E 5BF > = > (Registered number 166023). For a list of European legal entities within > t= > he Invensys Process Systems business group, please click here > http://www.in= > vensys.com/legal/default.asp?top_nav_id=3D77&nav_id=3D80&prev_id=3D77. > > If you have received this e-mail in error, you are on notice of its > status.= > Please notify us immediately by reply e-mail and then delete this message > = > from your system. Thank you for your co-operation. You may contact our > Help= > desk on +44 (0)20 7821 3859 / 2105 or email inet.hqhelpdesk@xxxxxxxxxxxxx > T= > his e-mail and any attachments thereto may be subject to the terms of any > a= > greements between Invensys (and/or its subsidiaries and affiliates) and > the= > recipient (and/or its subsidiaries and affiliates). > > > > > _______________________________________________________________________ > This mailing list is neither sponsored nor endorsed by Invensys Process > Systems (formerly The Foxboro Company). Use the info you obtain here at > your own risks. Read http://www.thecassandraproject.org/disclaimer.html > > foxboro mailing list: //www.freelists.org/list/foxboro > to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join > to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave > > _______________________________________________________________________ This mailing list is neither sponsored nor endorsed by Invensys Process Systems (formerly The Foxboro Company). Use the info you obtain here at your own risks. Read http://www.thecassandraproject.org/disclaimer.html foxboro mailing list: //www.freelists.org/list/foxboro to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave