The KXUSB cable plugs into the common USB port on a computer and creates a virtual COM port, when the appropriate drivers are also installed on the computer.
A: No. At order time, a KXSERa cable can be substituted for the KXUSB. The KXSER cable is designed to connect to a 9-pin COM port on a computer.
If you have a USB port on your computers, we recommend the KXUSB cable that ships automatically with the KX3 or KX2 and other Elecraft products.
A: Where possible, we always recommend the KXUSB cable. This cable provides the flexibility to connect to most any newer computer available today.
A: You can order the KXUSB cable separately as Elecraft product KXUSBa.