Creating a KNx point for Modbus Device Communication Error Situation

[Erwin van der Zwart]

Hi,

Here is a version with writing to KNX objects:

Code:

-- Check all modbus meters for connection

-- Function to send changes to KNX
function writetoknx(name,active)
    if name == 'Meter 1' then  -- name must match modbus device name
   grp.write('1/1/1', toboolean(active))
 elseif name == 'Meter 2' then
   grp.write('1/1/2', toboolean(active))
 elseif name == 'Meter 3' then
   grp.write('1/1/3', toboolean(active))
 elseif name == 'Meter 4' then
   grp.write('1/1/4', toboolean(active))
 elseif name == 'Meter 5' then
   grp.write('1/1/5', toboolean(active))
 end
end

-- Get meter status
query = 'SELECT * FROM modbus_devices'
meter_state = db:getall(query)
previous_state = storage.get('meterstate')
if previous_state == nil then
 for _, device in ipairs(meter_state) do
     writetoknx(device.name,device.active)
 end
 storage.set('meterstate', meter_state)
else
 for _, device in ipairs(meter_state) do
   if device.active ~= previous_state[_].active then
        writetoknx(device.name,device.active)
   end    
 end
 storage.set('meterstate', meter_state)
end

 
BR,
Erwin