Periodically, there is a situation where there are no COM ports on the computer or they are already occupied, and connecting the device is necessary, what should I do in such a situation?
Under the COM port, the article refers to one of the interfaces RS-232, RS-422 or RS-485.
Below are presented several options for solving this situation.
You have a free COM port, but it has a different interface or you need two ports instead of one.
You have a free USB connector, but there is no COM port.
A special USB to COM converter will add the COM port to the computer. After installing the driver, you can use the COM port as if it were always on your computer.
There are situations when the computer is quite far from the device with the COM port, but you can use the Ethernet network. In this case, you will benefit from the Ethernet server serial interfaces, which allows you to work with the end devices via a virtual COM port.
And if you use the Modbus RTU protocol, then it's more appropriate to use a special Modbus gateway, instead of a serial interface server, because the gateway allows you to avoid errors when passing specialized protocols over Ethernet. Modbus gateways are located in the Modbus Gateway section.
If the computer has the ability to connect to a Wi-Fi access point, how can I connect additional devices with the COM port?
And if you need many independent and different COM ports on your computer, what to use?
In this case, you can put a special multiport board with several COM ports, which is installed in one of the slots PCI, PCI Express or ISA.
A large selection of cards is available in the Multiport boards section.
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