Now I did it but it can't be done!

if you edit your first post it should allow you to change the title. Have you tired that?

Thanks
Felix

You are welcome. I am glad to hear you got it working to your liking.

I don't know of an official way to mark a post as resolved. Sometimes people change the title and prepend it with [Solved], but I haven't seen that in a while. I'll leave that up to you.

Thanks
Felix

from what I can tell Modbus Slave (Server) blocks have not yet been implemented in UIFlow2.

That said, please find below a Modbus Slave (Server) example in UIFlow1:

from m5stack import *
from m5ui import *
from uiflow import *
from modbus.slave.rtu import ModbusSlave

setScreenColor(0x222222)

myVal = None

label0 = M5TextBox(20, 31, "label0", lcd.FONT_Default, 0xFFFFFF, rotate=0)
label1 = M5TextBox(19, 69, "label1", lcd.FONT_Default, 0xFFFFFF, rotate=0)

label0.setText('Coil 0 : off')
label1.setText('Coil 1 : off')
modbus_s = ModbusSlave(2, tx=17, rx=16, baudrate=9600, data_bits=8, stop_bits=1, parity=None, slaveID=4)
modbus_s.function_init(5, 0, 2)
while True:
  myVal = modbus_s.receive_req_create_pdu()
  if (modbus_s.find_function) == (5):
    if modbus_s.find_address==0:
      if myVal == 0:
        label0.setText('Coil 0 : off')
      else:
        label0.setText('Coil 0 : on')
    elif modbus_s.find_address==1:
      if myVal == 0:
        label1.setText('Coil 1 : off')
      else:
        label1.setText('Coil 1 : on')
    else:
      pass
    modbus_s.create_slave_response(myVal)
  wait_ms(2)

Thanks
Felix

which M5Core / Modbus hardware are you panning to use?

Documentation about the 4-Channel Relay module can be found here.

The required libraries (and examples) can be found here:

• M5Module-4Relay
• Modbus
• RS485

I suggest you start with controlling the four relays from the M5Core first (w/o Modbus). Then learn about Modbus master and slave. And finally combine Modbus with the relays.

Thanks
Felix