This an RS485 Modbus CNC I/O Module designed for use with the 6 Pack Universal CNC Controller. It can be used to control RS485 spindle VFDs. The currently firmware supports Huanyang spindles with both the original and newer protocols.

RS485 Control is very robust and allow both precise speed control as well as direction control. The firmware constantly monitors the performance of the spindle and can stop your job if the spindle working properly.

Configuring for FluidNC

# module Socket #3
Huanyang:
  uart:
    txd_pin: gpio.26
    rxd_pin: gpio.16
    rts_pin: gpio.4
    baud: 9600
    mode: 8N1
  modbus_id: 1
  tool_num: 0
  speed_map: 0=0% 0=25% 6000=25% 24000=100%

#Module Socket #3

Huanyang:
  uart:
    txd_pin: gpio.14
    rxd_pin: gpio.15
    rts_pin: gpio.13
    baud: 9600
    mode: 8N1
  modbus_id: 1
  tool_num: 10
  speed_map: 0=0% 0=25% 6000=25% 24000=100%

• Buying assembled from JLCPCB
  
  They will only assemble one side. You should specifiy the top side. You must purchase and solder the 12 pin header on the bottom. It is a standard 0.100" (2.54mm) pitch header. You can buy snap off style many places or the exact part here. LCSC part number C225487
  
  You also need to buy the mating terminal block (Cixi Kefa Elec KF2EDGK-3.5-3P) from LCSC
• 
  Both those parts are on the BOM of the schematic.
  
  PCB Specs
  
  You can use all of the defaults. I typically change the solder mask to black for 6 Pack modules.
  
  Material:FR4
  Layers: 2
  Thickness: 1.6mm
  Copper Weight: 1oz

How to order

Here is a video on how to order.