@sgaforbes
You can use the FT sensor on a KRC2. The sensor uses Modbus RTU protocol over RS-485. The KRC2 have a standard DeviceNet Master card. So you can buy a gateway from another vendor like Anybus to convert the Modbus RTU protocol to DeviceNet. You will then have access to the registers in the FT sensor to read forces and torques. Those registers are described in the manual here:
http://support.robotiq.com/display/FTS2/4.5+Serial+communication
Has anyone integrated either an FT150 or FT300 with Kuka KRC2?