RS232

[JMM]

Hello, 
I have a client who has a Homelynk on their installation running with LM5 firmware. 
Everything works perfectly except the RS232 port which is not recognized. 
Do you have a solution for this?" 

BR

[Daniel]

How did you test it?

[JMM]

Code:

-- Fonction pour vérifier si le port est libre (sans lsof)
function isPortFree()
  local test_port = serial.open('/dev/RS232', {
    baudrate = 1200,
    databits = 7,
    stopbits = 1,
    parity = 'even',
    duplex = 'half'
  })
 
  if test_port then
    test_port:close()
    log("Port libre")
    return true
  else
    log("Port occupé ou inaccessible")
    return false
  end
end

isPortFree()

And error log :
test le port rs232 11.06.2025 10:45:53
User script:3: attempt to index global 'serial' (a nil value)
stack traceback:
User script:3: in function 'isPortFree'
User script:21: in main chunk

[Daniel]

Actually this is correct. Hw is not the same as LM and this will not work.

[JMM]

OK thank Daniel.

[Erwin van der Zwart]

I think it will work if you add on top -> require('serial')

Code:

require('serial')
port = serial.open('/dev/RS232', {
  baudrate = 38400,
  databits = 8,
  stopbits = 1,
  parity = 'none',
  duplex = 'full'
})

[JMM]

Hello,

Yes of course I just copied the function but require('serial') is present in the script

[JMM]

hi,
When Hw runs with its own firmware, the RS232, ModBus, and USB ports are fully usable.
When Hw runs with the LM5 firmware, only the RS232 port is no longer usable.
So, it's just a software issue and not a hardware one. Do you have a solution?

BR

[Daniel]

No