Motor control system for control of a motor and a display device

A motor control system comprising:

• a numerical controller;
• at least one amplifier which drives a motor based on a motor command from the numerical controller;
• at least one display device which carries out screen display;
• and
• a single serial bus which connects the numerical controller, the at least one amplifier, and the at least one display device, the numerical controller communicating with both the amplifier and the display device, and the display device in communication with both a first of the at least one amplifier and a second of the at least one amplifier via the single serial bus;
• wherein the numerical controller includes a first transmission buffer, a second transmission buffer, and a serial bus control circuit, wherein the first transmission buffer and the second transmission buffer are separate and independent of one another, and wherein the numerical controller does not include the display device and the at least one amplifier, and
• the numerical controller calculates the motor command for motor control, stores the calculated motor command in the first transmission buffer, and stores the display data in the second transmission buffer, wherein
• the serial bus control circuit outputs the motor command stored in the first transmission buffer and the display data stored in the second transmission buffer to the serial bus, depending on the amplifier or the display device connected to the serial bus,
• the amplifier drives the motor based on the motor command received from the numerical controller via the serial bus, and
• the display device carries out screen display based on the display data received from the numerical controller via the serial bus, and wherein
• a data length of the motor command per motor output from the numerical controller is fixed, and
• a data length of the display data transmitted to the display device is an integer multiple of the data length of the motor command.