Modbus TCP slave example

[automatikas]

Replace this:

Code:

-- modbus slave, listen on all interfaces and default port 502 mb = luamodbus.tcp() mb:open('0.0.0.0', 502) -- setting slave id is optional -- mb:setslave(1)

With this (adjust serial settings and slave id as needed):

Code:

mb = luamodbus.rtu() mb:open('/dev/RS485', 9600, 'E', 8, 1, 'H') mb:connect() mb:setslave(1)

RS-232 is mostly used for ModBus ASCII which is not supported.

works like a charm

but needed to change port to /dev/RS485-1 to make it working