Problems to get DMX to work

[admin]

Use this script to test communication between RS485-1 <> RS485-2. Only single resident script is required.

Code:

require('serial')

p1 = serial.open('/dev/RS485-1', { duplex = 'half' })
p2 = serial.open('/dev/RS485-2', { duplex = 'half' })

function test(p1, p2)
  p1:flush()
  p2:flush()

  for i = 1, 100 do
    p1:write('1234567890')
    res = p2:read(10, 1)
    if not res or res ~= '1234567890' then
      haserror = true
      break
    end
  end
end

haserror = false

test(p2, p1)
test(p1, p2)

if haserror then
  alert('RS485 ERROR')
else
  alert('RS485 OK')
end