Perfect Harmony Gen3

My question is: Some analog values coming from the VFD, which are: Speed Feedback word 1 and word 2, Total current Feedback w1 and w2, Motor Voltage Feedback w1 and w2, and Power voltage w1 and w2. In the original canned PLC program only the first word of each value is used for scaling. Every value is divided by 8192, can you tell me why this is 8192? Are these Unsigned Integers? Any manual or reference material would be greatly appreciated.

NXG comms manualhere