hello, I hope that someone can help me on this issue: i want to connect my 68hc12 microcontroller to a gsm modem through serial rs232. My current status is as follows: I can transmit data from microcontroller to hyperterm on PC I can talk to my gsm modem through the hyperterminal However, the gsm does not respond at all when i try to transmitt data to it through microctroller
I have a dragon 12 board that cointains MC9S12DP256. My gsm modem is westermo GD-01
You probably need a 'null' modem cable when connecting the Dragon to the modem. Since dragon and the modem both have the same pin out based on what you stated, pins 2 & 3 need to be cross connected.
