Used with XC709M series, XC709D series, XC809M series, XC809D series, XC809T series, XC1000M series, XC1000D series, XC1000T series, XC799T series, XC799D series, XC799M series, XC899T series, XC889D series, XC899M series,RS485 absolute value CNC system, used to connect RS485 absolute value servo, The system does not need to install limit, mechanical zero, etc., to realize the boot does not return to mechanical zero, memory position.