> Once you send the AT commands to dial to a host....how does the PIC see its > connected? Generally a text string sent back saying its connected > typically? Then I assume its just sending data back and forth... Yes, in the old days, you actually saw this CONNECT string when you tried to connect, before windows hid everything behind a GUI... You can tell the modem to either send a text or numeric return value.. You can set a timeout period as well... After that, just send bytes down and read bytes out... Just be careful of certain escape sequences.. Check out the Hayes modem spec for more info.. you can configure the modem with AT commands as well... cheers.. -- with metta, Shawn Tan -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist