Titan TTS2 Manual page 58

5) The system checks the current coordinate file, if checks
it ,then display the coordinates and you can press [F4];
6) Input "Code" and target height "T.H";
7) Press [F3](Meas);
8) Aim at the backsight point, and select a key of
measurement mode. For example: press [F2](SD), then
measure the backsight point;
9) Press [F4] (Yes) to finish setting backsight point. The
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