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+--- Thread: Modbus TCP connection status (/showthread.php?tid=921)
Modbus TCP connection status - leonidas - 01.08.2017
Hello,
Do anyone know a good way to detect if there is or there is no connection with Modbus TCP device?
Code:
require('luamodbus')
mb = luamodbus.rtu()
mb:open('/dev/RS485-1', 9600, 'E', 8, 1, 'H')
mb:connect()
mb:setslave(1)
mb:setresponsetimeout(100)
-- --
-- some modbus reading --
-- --
mb:close()RE: Modbus TCP connection status - admin - 01.08.2017
mb:connect() will return nil plus error message when connection cannot be established. If it breaks afterwards then all read/write calls will act the same.