Hi there, I'm working on getting an arduino talking to a modem.
I've got a pre-built Max232-based adapter, and I've successfully used this to talk to my PC using SoftwareSerial just fine.
I've also used my PC to talk to the modem and dial out, just fine.
However, when I attach the arduino to the modem, it does not work. Everything is happening at 9600bps - I've confirmed the modem can be communicated to at this speed - all the hyperterminal settings match identically. I've tried with the rx/tx swapped as well, no help.
Does anyone have any hints about what may have gone wrong? This is for a project I really need to get working quickly. Thank you very much :-)