However, somewhere there is a 25-pin COM port, which is about the same as the LPT port, but it's a male, while the LPT port is female. COM ports on existing computers (where available) are mostly 9-pin male. However, with the robotics or control, the COM-RS232 is very popular for its simplicity and also because of. This standard is quite slow compared to USB. Today, with the emergence and "expansion" of the USB standard, the COM port (and either the LPT port or the parallel port) is disappearing.ĬOM port communication is RS232 serial communication.
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