Chapter 2 Installation, Configuration, and Operation©National Instruments Corporation2-5PXI-1000B User ManualYou can use the Inhibit signal (active low) to turn off the power supplyoutputs. To use this feature, connect the Inhibit pin (pin 5) to a LogicGround pin (pin 1 or 9) on the AC-only input power supply or InhibitReturn (pin 3) for the DC-capable power supply. Make sure the front(standby) switch is in the ON position. As long as the connection is made,the power supply inhibits its DC outputs. DC output resumes when Inhibitis no longer connected. Note that the power (standby) switch, located on thefront of the chassis, uses this inhibiting feature. For remote reset, connect amomentary switch between pin 5 and pin 1 (or pin 9) on the AC-only inputpower supply or between pin 5 and pin 3 for the DC-capable power supply.Power Supply Status Indication (DC-Capable PowerSupply Only)If your PXI-1000B has a DC-capable power supply refer to the followingtable for power supply indications provided by the Power Supply StatusLED. Refer to Figure 1-3, Rear View of the DC-Capable PXI-1000BMainframe, for a diagram of the Power Supply Status LED..5 Inhibit*6 +12 V7 Reserved8 –12 V9 Logic GroundTable 2-3. Power Supply Status Indication, DC OnlyPower Source Power Switch Mode Status LEDAC or External DC Input Standby GreenAC or External DC Input On Bright GreenTable 2-2. DB-9 Connector Pinout (Continued)DB-9 Pin Signal5 4 3 2 19 8 7 6
