Descriptions: 1. Support for 4axis linkage, you can connect four stepper motor drives or servo drives;  2. Maximum step-pulse frequency is 100KHz,which is suitable for the servo or stepping motor;  3. Support automatic probe tool;  4. Support Emergency input;  5. Support for limit switch;  6. Support for connecting electronic handwheel;  7. Need use external 24V DC power supply to isolate USB and external port, and to make the system more stable;  8. Have 0-10V output port, you can use mach3 software to control the spindle motor speed;  9. 4 general-purpose inputs, you can connect the limit switch, estop switch, probe switch, back to zero and other device;  10. 4 general-purpose isolated relay drive output interface, can drive four relays for controlling the spindle starts, forward rotating and reverse rotating, pumps and other device;  11. 1 status LED, indicate connection status on the board.  Package Included: 1 x  Board 1 x USB cable 1 x CD