is modbus device online - Printable Version

is modbus device online - Printable Version

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is modbus device online - benanderson_475 - 04.09.2020

Is there a way in lua to return true or false if a specific modbus device is online? say modbus device at address 3?

Many thanks

RE: is modbus device online - Daniel - 04.09.2020

You can check it like this

Code:
-- 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

RE: is modbus device online - benanderson_475 - 08.09.2020

(04.09.2020, 07:29)Daniel. Wrote: You can check it like this

Code:
-- 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

Many Thanks, it works perfectly Smile

RE: is modbus device online - balatis - 13.09.2020

(04.09.2020, 07:29)Daniel. Wrote: You can check it like this

Code:
-- 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

RE: is modbus device online - Erwin van der Zwart - 13.09.2020

grp.checkwrite('1/1/1', checkrtu(1, 1))

or

grp.checkwrite('1/1/1', checktcp('192.168.0.11', 502))

RE: is modbus device online - balatis - 13.09.2020

(13.09.2020, 17:57)Erwin van der Zwart Wrote: grp.checkwrite('1/1/1', checkrtu(1, 1))

or

grp.checkwrite('1/1/1', checktcp('192.168.0.11', 502))

thanks Erwin!