Nikon DTM-502 Series Instruction Manual page 193

3) In Station Setup
8
8-3
The input PT (or coordinate) is identical to the
current station in STN/1:Known.
Or, the same coordinate or point name/number is
found in Resection.
Action: Press any key to return to the PT input
screen. Use different PT.
There is not enough space to record a station when
you start any of the Station setup functions.
[ESC]/[Abrt] = returns to the BMS. Old jobs
have to be deleted by [DEL] in Job
Manager.
[ENT]/[OK] = allows you to continue but you
may not be able to record the
whole process.
The input point for ST/BS doesn't have N/E
coordinates.
Action: Press any key to return to the PT input
screen. Use a different PT.
The input point for Benchmark doesn't have a Z
coordinate.
Action: Press any key to return to the PT input
screen. Use a different PT.