When I tested my serial port's voltage I am getting reversed polarity. :? Is this normal? It is negative voltage? As you can tell I am really new to working with the serial port.
When I tested my serial port's voltage I am getting reversed polarity. :? Is this normal? It is negative voltage? As you can tell I am really new to working with the serial port.
When I tested my serial port's voltage I am getting reversed polarity. :? Is this normal? It is negative voltage? As you can tell I am really new to working with the serial port.
It's normal. https://www.lammertbies.nl/comm/info/RS-232_specs.html#phys
The readings I get from standard serial ports are typically +-10-16V. Laptops give weaker voltages, maybe +-8V.
Because most uCs take in 5V (or <3V for low voltage uCs), you will need a level shifter IC to protect the uC. That's the function of the MAX232 chip.
It's normal. https://www.lammertbies.nl/comm/info/RS-232_specs.html#phys
The readings I get from standard serial ports are typically +-10-16V. Laptops give weaker voltages, maybe +-8V.
Because most uCs take in 5V (or <3V for low voltage uCs), you will need a level shifter IC to protect the uC. That's the function of the MAX232 chip.