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In line with the standard RS232 interface that is often referred to as COM port serial interface, from the sense signals RS232 and UART format is basically the same thing, the most important difference is that RS232 level must meet the RS232 specifications, standard RS232 electrical level range is-12V to +12 V, the norm that is not free when the case of data output for-12V, is for this reason that the specifications can be used RS232 data output to further afield.

I provide the COM interface is RS232 compatible levels "9600,8, n, 1" format, that is, communication rate of 9600bps, 8 data bits, 1 stop bit, without parity bit. RS232 is compatible with the mean level, PC is a machine without the COM terminal of power supply, receivers get their power from the data online, and there are strict restrictions on power consumption, the output level is between 0 to 5V RS232 requirements rather than to the-12V level +12 V, which is why COM interfaces of the transmission distance is less than the real RS232 specifications, the general extension of lines up to 3-5 meters then.