??? 03/10/07 11:09 Read: times |
#134680 - Voice mode only! No data communication. Responding to: ???'s previous message |
In my case, i only need the modem to dial to a receiver, then detect if the call is answered. once the call is answered, the modem will output a series of DTMF tones at various timing (simulate a sound of alarm perhaps). I don't think DCD is necessary here, is there? RxD and TxD would be sufficient for most of the basic things i wanted to do.
Also, a question about hyperterminal, i have tried communicating with the modem, and upon sending ATDT######### where ####### is my cell phone number, it successfully dialed the number and i answered it. However upon answering the call, any further attempt to communicate with the modem through the hyperterminal will result in a "NO CARRIER" error and disconnection. I have read the AT Command manual over and over again but i can't seems to find a solution to it. What i need to perform is that, upon answering call, i want to be able to transmit any DTMF tones over the connection so that the receiver can hear it. No voice transmission is necessary. What am i missing? |