What is a serial port interface?
In simple terms, a serial port interface translates signals from a computer serial port to be used to place a transceiver into transmit or send CW (morse code) characters. A computer serial port usually has 9 pins, although some older PC’s may have 25 pin serial ports fitted. Both types carry out the same function, the only difference being the size and the pin connections. As it’s name suggests, a serial port sends data serially, in other words, each piece of data is sent one after the other.