A COM port can not be converted to a USB port just by using software. The signal types, levels, protocol, connector type all are different.
COM port is used to configure a router but you can also get a COM port to USB port adapter which can configure a router using a USB port.
You can have a USB Serial (COM) port and you can connect PCs together using Serial (COM) port.
On a digital multi-meter the black lead connects to the common (COM) port in the meter.
A com port can also be called a serial port.
To test COM ports, you need a computer with a functioning serial port or a USB-to-serial adapter, appropriate software for communication (like terminal emulation software), and a loopback connector or a serial device to connect to the port. Additionally, you may require a null modem cable if you are testing communication between two devices. Ensure that the correct COM port settings (baud rate, data bits, parity, stop bits, and flow control) are configured in the software.
A COM surrogate is often used in computer science and is also known as a virtual COM port. It is used in cases when a computer has no COM port (type of connection) and is used to trick the computer into thinking it has one, while using a different one (USB for example), while having attached an USB to COM switch to that USB port.
how many ports does com port have
A com port is the old type of serial port on a PC. They are numbered, and some PCs had two or more. Someone might use com port one for a mouse and com port two for a modem.
A virtual port is a software emulation of a port which normally would be present in hardware. This is most commonly used with modems and printers. Many internal modems emulate a COM port. When modems first became common by far the most common type was an external modem which plugged into a serial port (a COM port) in the back of the machine. Nearly all of the early dial-up networking applications were written with the assumption that the modem could be found on one of these COM ports. While it is no longer necessary for the modem to reside on a COM port, most new modems still emulate one in order to maintain compatibility with these legacy applications. Printers can also reside on a virtual port for much the same reasons. All printers used to plug into a parallel port (an LPT port) on the computer. As a result many legacy programs were written with the assumption that any printers would be located on an LPT port. When USB printers became commonplace it became necessary to allow these USB printers to be assigned a virtual parallel port in order to maintain compatibility with these older programs. This can be configured in the OS in the printers settings and is most often used for DOS-level point-of-sale or data-entry applications.
Using the com port
Use the "change port" command (without the quotes, of course) to change the port you're deciding to map to somewhere else. First, to display the current com port mappings, you can use change port / query Then, to change a port, type change [old com port]=[new com port] NOTE: Change the text in the brackets to the actual com port, making sure to use keyword "COM," again without the quotes, and in the example, without the brackets Here's an example: change port COM2=COM4 Finally, to delete a COM port listing, use the following format: change port /d [COM PORT] Here's an example of deleting a COM port listing: change port /d COM8 Hope this helps!
Communication Port.