The design of stepper motor system based on CAN bus

This paper designs an stepper motor control system apply to blood coagulation analyzer, which mainly includes the design of the hardware of nodes in slave machine, the communication program and motor control program and software in host machine. Combining with the CAN bus, the system uses MC9S12XS128 micro controller as control core and SLA7078MR as drive chips of the stepper motor to realize the communication between host machine and slave machine. Test results show that the system runs stably and has well real-time reliability.