RS485 Modbus Module

This is an RS485 CNC Module that can be used to control spindle VFDs (Variable Frequency Drives).

Huanyang Wiring

Ideally use 22-24awg twisted, shielded cable. If that is not available a twisted pair of wires will work for smaller machines. Ethernet cable can work too.

RS485 Module	VFD	Description
A	RS+	Low (logic 1)
B	RS-	High (logic 1)
Gnd	N/C	Terminate cable shield if you have one

VFD Parameters

Before using the parameters must be setup per below.

Parameter	Value	Description
PD001	2	RS485 Control of run commands
PD002	2	RS485 Control of operating frequency
PD005	400	(Hz) Maximum frequency Hz (RPM/60)
PD011	120	(Hz) Minimum frequency Hz (RPM/60) (Recommend Aircooled=120 Water=100)
PD014	10	Acceleration time (Test to optimize)
PD015	10	Deceleration time (Test to optimize)
PD023	1	Reverse run enabled
PD142	3.7	Max current Amps (0.8kw=3.7 1.5kw=7.0, 2.2kw=??)
PD143	2	Motor Poles Typically 2. It is used for RPM Hz to RPM conversion
PD163	1	RS485 Address
PD164	1	RS485 Baud rate: 9600
PD165	3	RS485 Mode: RTU, 8N1

FluidNC config File Examples

Module Socket #3

uart1:
  txd_pin: gpio.26
  rxd_pin: gpio.16
  rts_pin: gpio.4
  baud: 9600
  mode: 8N1

Huanyang:
  uart_num: 1
  modbus_id: 1
  tool_num: 0
  speed_map: 0=0% 0=25% 6000=25% 24000=100%

Module Socket #4

uart1:
  txd_pin: gpio.14
  rxd_pin: gpio.15
  rts_pin: gpio.13
  baud: 9600
  mode: 8N1

Huanyang:
  uart_num: 1
  modbus_id: 1
  tool_num: 10
  speed_map: 0=0% 0=25% 6000=25% 24000=100%

Grbl_ESP32 Machine Definition Examples

Socket #1 cannot be used because all pins are input only

Socket #2 should work...not tested yet. (waiting for V1p1 hardware)

// RS485 Modbus In socket #3
// https://github.com/bdring/6-Pack_CNC_Controller/wiki/RS485-Modbus-Module
#define SPINDLE_TYPE            SpindleType::HUANYANG // default, check actual $Spindle/Type Setting
#define VFD_RS485_TXD_PIN        GPIO_NUM_26
#define VFD_RS485_RTS_PIN        GPIO_NUM_4
#define VFD_RS485_RXD_PIN        GPIO_NUM_16

// RS485 Modbus In socket #4
// https://github.com/bdring/6-Pack_CNC_Controller/wiki/RS485-Modbus-Module
#define SPINDLE_TYPE            SpindleType::HUANYANG // default, check actual $Spindle/Type Setting
#define VFD_RS485_TXD_PIN        GPIO_NUM_14
#define VFD_RS485_RTS_PIN        GPIO_NUM_13
#define VFD_RS485_RXD_PIN        GPIO_NUM_15

Socket # 5 cannot be used because all pins are output only.