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We plan to use 5V TTL signals throughout the KPF system to trigger various devices. These signals will be used to open and close shutters, and to control CCDS CCD time-sensitive operations (start acquisition, start readout, etc).
One issue with this scheme is that the Galil RIO 47142 controllers we have already purchased cannot use voltages less than 12V on their Digital Out (“DO”) lines. Furthermore, as shown below, the various devices being controlled cannot accept voltages higher than ~5V for the Trigger In signals.
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