Robert Nansel wrote:

> Data returned: Time Of Flight (TOF) to nearest half millisecond in binary.
> Second choice would be BCD. Use TOF instead of absolute distance because
> seconds are the same in MKS and Conventional units, and each node can scale
> this into desired range units if needed. Also, you can adjust for
> temperature & altitude effects more readily.

TOF makes a lot of sense, if you need to measure distance in something other
than air the measurement is more "intuitive".  I wouldn't bother with BCD
though, binary math is much easier to deal with IMO.

Roger