The lack of MAX, MIN and AVE readings from the Home Page of your RF500 System Gateway is normal for the new 2015 Interface. If you want to view MAX, MIN and AVE readings for the Transmitter in question please switch to ‘List View’.
If you are using the old HTML interface of the RF500 System Gateway, then this suggests that there is a fault with the channel in question. Check the Summary Page to check to see if there is live data for the channel.
If in doubt then please contact us for further advice.