If you're using an NX-700/800 for a base for KAS-10 you have to have the gps board installed or it won't work. If using an NX-720/820 you can build a cable. DB15 pins 6(TXD), 7(RXD), 8(RTS), 9(CTS), 15(GND).
If you're using KAS-20, you can't use an NX-700/800 or NX-720/820 you have to use an NXR-710/810, and if you can get it to work, please let me know how. I have Kenwood tech support scratching their heads.