Connect my device via RS485 ?

[admin]

First, you need to set device address via broadacst message, so make sure only one device is connected to RS-485 line:

Code:

require('luamodbus')
mb = luamodbus.rtu()

mb:open('/dev/RS485-1', 9600, 'N', 8, 2, 'H')
mb:connect()

-- set new address to 10 via broadcast
mb:setslave(0)
mb:writeregisters(0, 10)

Then you can control it like this:

Code:

require('luamodbus')
mb = luamodbus.rtu()

mb:open('/dev/RS485-1', 9600, 'N', 8, 2, 'H')
mb:connect()

mb:setslave(10)

mb:writeregisters(4, 255) -- set red to 255
mb:writeregisters(5, 127) -- set green to 127
mb:writeregisters(6, 50) -- set blue to 50
mb:writeregisters(7, 80) -- set white to 80

If this works fine, then a profile can be created to make mapping from ModBus tab without scripts.