The CS100 is a standard controller produced by ICOS for their tunable filters (see Fig. 2). This device is an accurate position servo-controller that applies correct voltage to each piezoelectric actuator to adjust gap width and parallelism between the mirrors. It can be controlled manually from its front panel, or remotely through a RS-232 serial port. Although the system is very reliable, it is a dated design and its specifications do not completely satisfy the OSIRIS requirements:
• The CS100 is only capable of remotely controlling the gap between the mirrors with a resolution of 2 ^m. OSIRIS needs to control the cavity width of the entire filter range (8-10^m), and with a resolution >0.5 nm.
• The CS100 allows remote control of some frontal panel switches and buttons. OSIRIS needs to control all front panel elements, and be able to read the front panel gauges.
• OSIRIS also needs to quickly adjust the cavity width and to synchronize with an external CCD controller trigger signal. The CS100 controller does not have this function.
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