I've just checked. Above blocks work for me with an M5Core2 as well. Instead of TX=17 / RX=16 I use TX=14 / RX=13. That said I do not have the RS485 unit so I am using the little RS485 board (which came with the LAN module) albeit outside the LAN module connected via a BUS module.

The ACSSR is powered from an external 12 V power supply. The little RS485 board is powered with 5 V from the M5Core2. There are only two wires between the ACSSR and the little RS485 board: A <-> A and B <-> B. I also added an 120 Ohm resistor between A and B of the little RS485 board. The ACSSR already has that resistor in place internally.

Thanks
Felix

Hello @ajb2k3

for your excellent ACSSR guide you'll find below the UIFlow Modbus blocks to switch the ACSSR on / off (together with the RGB LED) using an M5Stack Basic.

Two things to note which were not obvious to me:

• Baudrate needs to be 115200 (anything lower only resets the ACSSR)
• to turn the ACSSR on the value needs to be 0xFF00 (See here)

Button functions:

• Button A: relay on / LED red
• Button B: relay off / LED green
• Button C: read version

and the corresponding Python code:

from m5stack import *
from m5ui import *
from uiflow import *
from modbus.master.uModBusSerial import uModBusSerial

setScreenColor(0x222222)

label0 = M5TextBox(54, 58, "label0", lcd.FONT_Default, 0xFFFFFF, rotate=0)
label1 = M5TextBox(54, 100, "label1", lcd.FONT_Default, 0xFFFFFF, rotate=0)
label2 = M5TextBox(50, 140, "label2", lcd.FONT_Default, 0xFFFFFF, rotate=0)

def buttonA_wasPressed():
  # global params
  label0.setText(str(modbus.write_single_coil(4, 0, 0xFF00)))
  label1.setText(str(modbus.write_single_register(4, 0, 0xF800, True)))
  pass
btnA.wasPressed(buttonA_wasPressed)

def buttonC_wasPressed():
  # global params
  label2.setText(str(modbus.read_holding_registers(4, 1, 1, True)))
  pass
btnC.wasPressed(buttonC_wasPressed)

def buttonB_wasPressed():
  # global params
  label0.setText(str(modbus.write_single_coil(4, 0, 0x00)))
  label1.setText(str(modbus.write_single_register(4, 0, 0x07E0, True)))
  pass
btnB.wasPressed(buttonB_wasPressed)

modbus = uModBusSerial(1, tx=17, rx=16, baudrate=115200, data_bits=8, stop_bits=1, parity=None, ctrl_pin=None)

Thanks
Felix

Thanks but can't get it to work on a core2 using the RS485 unit

for your excellent ACSSR guide you'll find below the UIFlow Modbus blocks to switch the ACSSR on / off (together with the RGB LED) using an M5Stack Basic.

Two things to note which were not obvious to me:

• Baudrate needs to be 115200 (anything lower only resets the ACSSR)
• to turn the ACSSR on the value needs to be 0xFF00 (See here)

Button functions:

• Button A: relay on / LED red
• Button B: relay off / LED green
• Button C: read version

and the corresponding Python code:

from m5stack import *
from m5ui import *
from uiflow import *
from modbus.master.uModBusSerial import uModBusSerial

setScreenColor(0x222222)

label0 = M5TextBox(54, 58, "label0", lcd.FONT_Default, 0xFFFFFF, rotate=0)
label1 = M5TextBox(54, 100, "label1", lcd.FONT_Default, 0xFFFFFF, rotate=0)
label2 = M5TextBox(50, 140, "label2", lcd.FONT_Default, 0xFFFFFF, rotate=0)

def buttonA_wasPressed():
  # global params
  label0.setText(str(modbus.write_single_coil(4, 0, 0xFF00)))
  label1.setText(str(modbus.write_single_register(4, 0, 0xF800, True)))
  pass
btnA.wasPressed(buttonA_wasPressed)

def buttonC_wasPressed():
  # global params
  label2.setText(str(modbus.read_holding_registers(4, 1, 1, True)))
  pass
btnC.wasPressed(buttonC_wasPressed)

def buttonB_wasPressed():
  # global params
  label0.setText(str(modbus.write_single_coil(4, 0, 0x00)))
  label1.setText(str(modbus.write_single_register(4, 0, 0x07E0, True)))
  pass
btnB.wasPressed(buttonB_wasPressed)

modbus = uModBusSerial(1, tx=17, rx=16, baudrate=115200, data_bits=8, stop_bits=1, parity=None, ctrl_pin=None)

Thanks
Felix