neazoi
Advanced Member level 6
I have this circuit **broken link removed** and I need to make it communicate with this **broken link removed**
But the modem IC uses UART 0/5v. I do not want to use the second UARD serial of the MCU so I am limited to the RS232.
Is there a simple discrete way to make these two devices communicate?
For data that is sent from the MCU to the modem, I believe a simple diode will suffice, to eliminate (making them zero) the negative pulses.
But for data received from the modem to the MCU, zero needs to be converted to -V (or is it one?)
So some kind of charge pump is needed.
But the modem IC uses UART 0/5v. I do not want to use the second UARD serial of the MCU so I am limited to the RS232.
Is there a simple discrete way to make these two devices communicate?
For data that is sent from the MCU to the modem, I believe a simple diode will suffice, to eliminate (making them zero) the negative pulses.
But for data received from the modem to the MCU, zero needs to be converted to -V (or is it one?)
So some kind of charge pump is needed.