On Mon, Sep 26, 2011, Graham Johnston wrote: >I am having an issue with Centos 6 and an external USRobotics modem. We >use the modem as part of a last resort SMS paging system. > >Across multiple Dell servers, different models, I can't not get the >modem to respond to simple AT commands while using Minicom. At the same >time if I connect the server to a console port on a switch I can >successfully access the switches serial console. So I know the serial >port itself is working. The modem still works fine if connected to a >Centos 5 server. > >Any thoughts? Which device are you using for the serial connection. It should be /dev/ttyS0 or similar to provide the correct modem control signals. The modem probably won't respond unless the DTR (Data Terminal Ready) line is up. It's been quite a while since I had to look at the modems on our system that runs HylaFAX and dialup connections, Bill -- INTERNET: bill at celestial.com Bill Campbell; Celestial Software LLC URL: http://www.celestial.com/ PO Box 820; 6641 E. Mercer Way Voice: (206) 236-1676 Mercer Island, WA 98040-0820 Fax: (206) 232-9186 Skype: jwccsllc (206) 855-5792 The only freedom which deserves the name, is that of pursuing our own good in our own way, so long as we do not attempt to deprive others of theirs, or impede their efforts to obtain it. -- John Stuart Mill, 1859