===ModBus===
Modbus can be connected to the PC or directly to KFLOP. A PC connection will not be deterministically real-time but may work for basic speed control and on/off. Here is a related Thread for interfacing KMotionCNC to Modbus using a [http://www.modbusdriver.com/modpoll.html free utility].:
[https://groupswww.yahoodynomotion.com/neoforum/groupsarchive/DynoMotion/conversations/topics/7941sending%20ModBus%20msgs%20from%20KmotionCNC%20to%20a%20RS485%20port.html Sending ModBus msgs from KmotionCNC to a RS485 port]