Hello
I have a NOKIA CELULAR PHONE that has a internal HAYES MODEM EMULATOR and i use a DRL3 DATA CABLE for make communication using my PC throught COMMx SERIAL PORT. The Hayes modem answer to my AT commands.
Recently, i used a microcontroller and i tried to connect to NOKIA CELULAR PHONE without the DRL3 DATA CABLE and i got success too! I removed the DRL3 cable and i did a direct connection. The Hayes modem answered to my AT commands.
I see that the NOKIA has a IRDA option that allows to talk with HAYES MODEM too. How is the circuit for transmit data for the modem? I intend to use my COMMx SERIAL PORT for send AT commands to HAYES MODEM using a SERIAL to IRDA converter, but, i don't know this circuit converts 1's and 0's.
My intention is a microcontroller estabilish a comunication with CELULAR HAYES MODEM without cables using HAYES PROTOCOL.
Thanks!
Miguel Wisintainer