Changes zero point of a given device so that its current position is equal to a given value.
[Angle] is an integer that specifies the angle number (the numbering scheme varies with the instrument).
[Pos] is a value to which the current software position of the selected motor will be reset to. Note that hardware angle is equal to software angle plus zero point.
For example, SET3=134.6 will change zero point of angle A3 in such a way that its current software position reads 134.6.