Hi René. We already did that. Furthermore, We installed two 110 ohm resistors at the end of the RX buses (I mean, one of them at the end of the RX bus of the DCS, and the other one at the end of the RX bus of the Trisen) Any other recommendation? Regards, René. -----Mensaje original----- De: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] En nombre de Bakker, René Enviado el: miércoles, 19 de octubre de 2011 02:33 a.m. Para: foxboro@xxxxxxxxxxxxx Asunto: Re: [foxboro] FBM230 and Trisen 310 Hello René, Please make sure that the RS-232 related switches, when using RS-422 (!!), as written in B0700AH, rev. L, top of page 30, are set as described there. If not (yet), please do so and see if it fixes your problem. If already taken care of, let us know. Regards, René Bakker - EMEATAC - Invensys Systems N.V. - Baarn - the Netherlands -----Original Message----- From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On Behalf Of Rene Morales Sent: Wednesday, October 19, 2011 2:59 AM To: foxboro@xxxxxxxxxxxxx Subject: [foxboro] FBM230 and Trisen 310 Hi all. We are communicating many kinds of equipments with the I/A using Modbus serial. We have Bently Nevada, Enraf, Omni, Hima, FSC, CCC, Woodward, Trisen (160 and 310), etc. All the systems look good, except the TS310. We have some strange behavior with 3 TS310 connected to the FBM230s, one of them are directly connected to one serial port, the other two are in a multidroop connection to other port. The TS310 has a RS422 port. Sometimes the communications are good, and then goes bad; sometimes the problem is fixed disabling the port in the DCS, sometimes the communication failure begins after a IACC download, sometimes the communications are good many hour, sometimes remains blinking... there had not been possible to isolate the issue. Any recommendation, note, trick, or knowledge (anything!!!) to fix this problem? Maybe there is an issue about RS422? This is the only one equipment using this kind of port, the rest are RS485 and RS232. Kind regards, Saludos, Rene Morales H. Email: morales_rene@xxxxxxxxxxx _______________________________________________________________________ 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 *** Confidentiality Notice: This e-mail, including any associated or attached files, is intended solely for the individual or entity to which it is addressed. This e-mail is confidential and may well also be legally privileged. If you have received it in error, you are on notice of its status. Please notify the sender immediately by reply e-mail and then delete this message from your system. Please do not copy it or use it for any purposes, or disclose its contents to any other person. This email comes from a division of the Invensys Group, owned by Invensys plc, which is a company registered in England and Wales with its registered office at 3rd Floor, 40 Grosvenor Place, London, SW1X 7AW (Registered number 166023). For a list of European legal entities within the Invensys Group, please go to http://www.invensys.com/en/legal/default.aspx. You may contact Invensys plc on +44 (0)20 3155 1200 or e-mail reception@xxxxxxxxxxxxx This e-mail and any attachments thereto may be subject to the terms of any agreements 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