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Appendix A Specifications 99
A.5.1 AUX I/O Cable
Each NIRvana-LN system includes an AUX I/O cable that provides convenient access to
several system signals. The AUX I/O interface cable is comprised of a male DB26
connector on one end, and five female BNC cables on the other end, each of which provides
access to a system signal.
Figure A-2 illustrates a typical cable.
Figure A-2: AUX I/O Cable (6050-0681)
Table A-5 provides the color code and pinout information for the AUX I/O interface cable.
22 Reserved Reserved for Future Use: DO NOT USE
23 SHUTTER MON The level at this output is high while the shutter is opening and during the programmed
exposure time. The output precisely brackets shutter-open time (exclusive of the shutter
close compensation time t
c
) and can be used to control an external shutter.
24 HEATER ENABLE Open or Logic 1 will enable the heater.
Logic 0 will disable the heater.
25 GND System digital ground. Any external circuitry intended to interface with the trigger control
signals must reference this ground connection.
26 GND System digital ground. Any external circuitry intended to interface with the trigger control
signals must reference this ground connection.
Table A-4: AUX I/O Connector Pinout and Signal Descriptions (Sheet 3 of 3)
Pin # Signal Name Signal Description
Table A-5: AUX I/O Interface Cable Pinout and Signal Information
Cable Color BNC Conductor Signal Name DB26 Pin #
Red Center TRIGGER IN 1
Shield Ground 3
Green Center TTL OUT 2
Shield Ground 6
Blue Center READOUT MON 7
Shield Ground 18
Gray Center EXPOSE MON 8
Shield Ground 20
Black Center SHUTTER MON 23
Shield Ground 25
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