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