So I am using an code and trying to communicate to another device using a usart. i have noticed that i must connect the transmit line of the usart to the transmit line of my rs232 level shifter to get things to display on my computer, why is this?
thank you.
Doesn't that require that the other side is also using RS485? The best interface is quite often the interface used by the other side...
By the way - need what -12V? Many serial interfaces for use at higher speed or longer distances needs negative voltages, unless they are using differential lines. But most trasceivers for such use has built-in voltage doublers and voltage inverters.