I was surprised as well to find a job that has an exact LON configuration file and it did work with no problem ,it is very rare!
I will definitely recheck cables again and probably connect LN board directly to 188E bypassing CWID ,travel cable and channel interface board in controller and see if LON starts responding .
I searched about the LONTALK board and apparently there were setting that I needed to change to make it work ,I am going back on Monday to try it again.