The communication between the Delta CNC controller and Delta servo motors adopts DMCNET, a fully digital communication system developed by Delta, rather than common analog voltage commands or pulse commands. Through DMCNET, commands are delivered via digital signals that are not confined by the speed limitation of pulse per second (pps) as for pulse commands. DMCNET is a real time communication system. With its redundancy function, users no longer need to write any redundant programs. It is capable of controlling up to 12 servo system units within 1ms. It can also accept double precision floating point values 64-bit wide, so the servo system can make more accurate calculations and provide higher operation flexibility.