com port area

COM port (cluster communication port) is the serial communication port. The COM port on the microcomputer is usually 9-pin, and there are also 25-pin interfaces with a maximum speed of 115200bps. It is usually used to connect the mouse (serial port) and communication equipment (such as connecting an external MODEM for data communication or some factory CNC machine interfaces), etc. Generally, there is only one COM port on the outside of the motherboard. The nine-hole output port (trapezoid) on the back of the chassis together with the parallel port is the COM1 port. The COM2 port is usually led out from the pins on the motherboard. The parallel port is the longest trapezoidal port.
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com port area

PC software

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COM port (cluster communication port) is the serial communication port. The COM port on the microcomputer is usually 9-pin, and there are also 25-pin interfaces with a maximum speed of 115200bps. It is usually used to connect the mouse (serial port) and communication equipment (such as connecting an external MODEM for data communication or some factory CNC machine interfaces), etc. Generally, there is only one COM port on the outside of the motherboard. The nine-hole output port (trapezoid) on the back of the chassis together with the parallel port is the COM1 port. The COM2 port is usually led out from the pins on the motherboard. The parallel port is the longest trapezoidal port.