I have been trying to establish connection between my PC and uC development kit over serial line. There is a standard serial port on the development kit. In oposite there is only USB ports on my laptop. So I have used USB to serial cable for the connection. The problem is that I am not sure whether it is a so called null-modem cable. Can anybody more experienced tell me how to double check it? Thanks in advance.
It would be very unusual for it to be a null-modem cable. A USB to serial converter normally allows you to add a serial port that is connected in, and works in the same way as the original COM ports fitted to desktop PCs. You would use a null-modem cable to connect, for instance, two PCs together.
If you would need a null-modem cable to connect your development kit to a desktop, you would also need one to connect to your USB converter.
I manufactured a serial device for 20 years. I have never seen a USB-SERIAL cable with null modem. Look in your System => Device Manager for Ports COM and LPT. It should be there if the driver is installed. The title or the driver may give more information. Most of these cables use the Prolific PL2303 chip.
If you are having problems, its most very likely a driver issue. The serial port and Windows was 97% of my tech support issues.
Try installing the Prolific Driver, the odds are good it will work.
IF that doesn't work Win 10 does a good job of finding the drivers automatically.
It is most likely NOT a null modem cable. It will be a DTE. Not a DCE. IBM designed the PC to be a terminal to their big iron so made it a data terminal rather than data circuit-terminating equipment. The USB cable's serial port is the same as if the PC had a serial port.
A development board made to work with a PC should be a DCE device using a straight through cable and not requiring a null modem unless the designer is an idiot.