Advanced & new version from PC to CNC Interface converter V.3 (BOB4) , connected to PC via parallel port and can control up to 4 stepper motors (X , Y , Z & V). General Description: FIPBOB4 is a complete, buffered non-isolated parallel breakout board. It supports four output control signal groups to drive four axis CNC machine with extra two duplicated auxiliary output control signals for X and Y axes. Each signal group supports two control signals (Clock and Direction). All signals are standard TTL level (Logic high implemented by 5V and logic low implemented by 0V) FIPBOB4 supports five standard limit switches. Two output relays could be enabled via DIP switch for additional spindle and fan control.  Features * 12-48 DCV power input. * Six output signal groups provides 4 axes control * Main X axis * Auxiliary X axis * Main Y axis * Auxiliary Y axis * Z axis * A axis * Each control signal group consists of Clock “CLK” and Direction “DIR” outputs. Control signals are TTL compatible (-10mA).for pin assignment and addressing show table1. * LED indicator for * Output clock signals “Red LED” * Output direction signals “Green LED” * General output signals “Red LED” for (O1 , O2 , O3 , O4) * Output relays “Red LED” for (Spindle , Coolant) * Input signals ”Yellow LED” * Power Supply “Green LED” * Five external inputs (Dry contact) for standard micro switches. * Two output relays 12V coil / 5A contacts (resistive load) for spindle and coolant control. * All outputs are brought out via pin header and pluggable screw clamp connector. * Dimension: 205 x 80 x 27 mm  * Main X axis * Auxiliary X axis * Main Y axis * Auxiliary Y axis * Z axis * A axis * Output clock signals “Red LED” * Output direction signals “Green LED” * General output signals “Red LED” for (O1 , O2 , O3 , O4) * Output relays “Red LED” for (Spindle , Coolant) * Input signals ”Yellow LED” * Power Supply “Green LED” For test software of this board (Download Here )