is modbus device online

[balatis]

You can check it like this

Code:

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-- First parameter is slave ID, second is optional RTU port number (1, 2 or 3; default is 1) function checkrtu(slave, portnr)   local query = 'SELECT active FROM modbus_devices WHERE proto="rtu" AND slave=? AND portnr=?'   if type(portnr) == 'number' and portnr == 2 or portnr == 3 then     portnr = portnr - 1   else     portnr = 0   end   local res = db:getone(query, slave, portnr)   return toboolean(res) end function checktcp(ip, port)   local settings, res   settings = tostring(ip) .. ':' .. tostring(port)   res = db:getone('SELECT active FROM modbus_devices WHERE proto="tcp" AND settings=?', settings)   return toboolean(res) end

Hi
As i can get the result in a group address??
Thanks in advance