5031TS Temperature Sensor problem

I am trying to read the temperature from a 5031TS sensor.

I understand this device does not automatically broadcast anything, and it has to be queried as required (and not to do it frequently so as not to flood the network)

I have read the posts at http://cbusforums.com/forums/showthread.php?t=5488&highlight=5031ts
and
http://www.cbusforums.com/forums/showthread.php?t=1229


So I know I need to use the GetUnitParameter Function. Ideally I want to display the temperature on a mk2 touchscreen when the user selects a page to display. I think I understand systioio variables and how to invoke code from a screen, and how to get results displayed to the screen - as I have other little programs I have written working fine that claculate and do things that interact with the user...

But I seem to be stumped in getting a reading from the 5031ts.

I have only 1 network on this setup, no bridges, nothing strange, have not changed any names or the like.
I am using software which until the last few days was the most recent. I want to solve this problem before I update to the latest.

If I use the toolkit, I can see the 5031TS is on the network, healthy, and I can scan and get the temperature reading. According to the toolkit it is Address 150 on the 'Local Network", application set as 'Heating (Legacy)'

So I was under the impression that the command follows would return the temperature for me;
LivingTemp := GetUnitParameter("Local Network", 150, ptTemperature);

Where LivingTemp was previously set as type of Real. Displaying the contents of LivingTemp results in 0 through piced.

Checking on the availability of the unit via
if GetUnitParamStatus(1, 150, ptTemperature) then ....
results in false or not available or error....


An experimental piece of code like;
LivingTemp := 1.1;
if GetUnitParamStatus(1, 150, ptTemperature) then
begin
LivingTemp := 2.2;
LivingTemp := GetUnitParameter("Local Network", 150, ptTemperature);
end;
SetRealSystemIO("MBRTemp",LivingTemp);

To determine where and what occurs - shows me that LivingTemp is displayed as 1.1 - so I never get into the loop for doing stuff..

I thought maybe there was a decimal / hexadecimal issue - so I tried 150dec = 96hex - same deal....

What am I doing wrong.....