Trimble S - Function description; Block diagram; IM - Instrument manager; PCS - Position Control system

Chapter 3
Theory of Operation
Trimble S, VX, SPS & RTS Service Manual3 - 18 P/N 57150002, Revision 5.0
F
Function description
Block diagram
Fig. 3-16 IPC board block diagram
IPC board consists of two main functions:
• IM - Instrument manager
• PCS - Position Control system
For information about the firmware in the instrument see page 3-52.
IM - Instrument manager
The IM part contains a micro controller, memory circuits, USB communication and power function.
IM handles the communication inside the instrument to the internal units/boards and external
communication via the base unit connector. The internal and external communication is done by
USB.
The IM function is equivalent to the PVX (excluding power) board in the Trimble 5600 series.
PCS - Position Control system
The PCS part contains same as IM a micro controller, memory circuits, USB communication and
power function.
PCS's main function is to control angle and servo system. It calculates angles with data from the angle
sensors and tilt sensor, converts this to an angle. IPC Also provides power to the horizontal and
vertical servo motors. The board controls the servo motors.
IM
PCS
PSM board
Servo knobs
Hub
Tilt sensor
Accelerometer
Vertical angle unit
& servo motor
Horizontal angle unit
& servo motor
Centre unit
(vertical sliprings)
IPC board