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The frequency is about 2.4kHz.It's been an adventure in non reliability. The PWM duty cycle will vary from 0 - 100% depending on the parameters set in the DeskCNC.Ini file. PWM Output for spindle speed controls needing a PWM signal. A logic low (0 v) is output when 'M05' (Spindle off) is interpreted. DESKCNC CONTROLLER CODEA logic high (+5v) is output when the M code 'M04' (CCW On) is interpreted from the g-code file. A logic low (0 v) is output when 'M05' (Spindle off) is interpreted.Ĭounter Clockwise Spindle output. A logic high (+5v) is output when the M code 'M03' (CW On) is interpreted from the g-code file. A logic low (0 v) is output when 'M09' (Coolant off) is interpreted.Ĭlockwise Spindle output. A logic high (+5v) is output when the M code 'M08' (Flood On) is interpreted from the g-code file. A logic low (0 v) is output when 'M09' (Coolant off) is interpreted.įlood coolant output. A logic high (+5v) is output when the M code 'M07' (Mist On) is interpreted from the g-code file. ![]() Attaching the optional Digitizing Probe to this terminal and gnd allows touch probe digitizing of 3D Models.Ĭonnect to the DIR line of the associated stepper or servo motor driver.Ĭonnect to the STEP line of the associated stepper or servo motor driver. This terminal should be left ungrounded for normal operation. If you are not using limit switches or an emergency stop button, then you will need to connect this terminal to gnd. Interpretation of the g-code file will then stop, and all axes movements will immediately stop. When a normally closed limit switch is opened, the controller will send an Emergency Stop (E-Stop) signal to the software. This terminal should be grounded for normal operation. When grounded during a homing operation, homing of the associated axis will start. Goes to pin 2, the Receive (Rx) line goes to pin 3, and the Ground line goes to pin 5. DESKCNC CONTROLLER SERIALIf your computer uses a 25 pin serial connector, make sure the Transmit (Tx) line The DeskCNC Controller connects to the computer serial port through a standard 9 Pin serial cable Do not reverse polarity as the board will be destroyed instantly. When power is applied, the green LED will glow. The 3 terminal connector is located at the bottom of the illustration here. The DeskCNC Controller board requires an 8 to 20 Volt DC supply (not included) through the 8V-20V DC terminal. DESKCNC CONTROLLER DRIVERIt is also worth while making one common ground for the pcb, motor driver boards and the mass of the machine itself. Ensure that any power/motor drive cables are routed away from the signal wires. Jogging, or running some G-code should show the on-screen coordinates changingīecause of the the risk of crosscoupling between the motor connecting and signal wires, it may well pay you to experiment with capacitors across the switch contacts, screened signal wires, and pull up or pull down resistors. DESKCNC CONTROLLER SOFTWAREThe software should then detect the controller, provided you set the correct serial port, etc. You do not need to connect any stepper motors, or ancillaries, but you must connect the Estop terminal to gnd. To test the controller and software, it is only necessary to connect the serial cable and power supply. The pcb silk screened annotation should be correct. Please check the position of the connections against your pcb. The actual component and connection layout of your pcb may differ from that shown here, certainly the firmware version has been superceded. The controller card, like the software, is under continuous development, and new features and other changes often occur. RWC - DeskCNC controller board DeskCNC Controller Board - Connections ![]()
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