Because modern Laptops and PCs don’t come with Rs232 serial ports any longer, you will need to get a USB to RS232 “Industrial grade” adapter and the proper serial cable to connect from the USB to RS232 adapter to your CNC Machine.
Reliable USB to Serial converter Compatible with Windows, plus new & legacy RS232 devices Use with mobile, instrumentation, & point-of-sale applications Great for laptop computers without a serial port CNC Control Compatible