026 - Serial Comms with MAX3221E RS-232 Transceiver скачать в хорошем качестве

026 - Serial Comms with MAX3221E RS-232 Transceiver

This one was a struggle. I normally use a dedicated oscilloscope so when it comes to using the BitScope, to display waveforms on the computer screen, I really struggle with the GUI. This video was intended to highlight that simply saying RS-232, or serial communications, does not describe the voltages involved on the Physical Interface, (copper conductors). A previous video dealt with interfacing to the Victron Energy MPPT Solar Charge Controller which used 5V on the line. That is much simpler to interface to 3.3V as it only requires a voltage divider on the receive channel. Interfacing to a proper 12V comms signal requires more then a voltage divider. This video uses a small expansion board featuring a Maxim MAX3221E RS-232 Transceiver to convert the 3.3V signal from the dsPIC33EP256MU806 to the 12V on the physical comms interface. The reverse is also true, the 12V signal received by the MAX3221E is shifted down to 3V3 for the micro-controller to correctly receive the signal. It went a bit long but there's a bit of coding and git usage in there. Thanks for watching, and hope it proves useful.