Chapter 2
Installation and Configuration
©
National Instruments Corporation
2-9
NI PXI-1042 Series User Manual
You can use the Inhibit signal (active low) to power off the chassis. To
remotely power off the chassis, connect the Inhibit pin (pin 5) to a Logic
Ground pin (pin 1 or 9). As long as this connection exists, the chassis will
remain off (standby); when you remove this connection, the chassis
turns on.
Note
For the Inhibit signal to control the On/Off (standby) state of the chassis, the front
power switch must be in the On (recessed) position.
Caution
When connecting digital voltmeter probes to the rear 9-pin D-SUB (DB-9)
connector, be careful not to short the probe leads together. Doing so could damage the
power supply.
You can use a digital voltmeter to ensure all voltage levels in the PXI-1042
Series are within the allowable limits. Referring to Table 2-2, connect one
lead of the voltmeter to a supply pin on the remote voltage monitoring
connector (9-pin D-SUB) on the rear panel. Refer to Table 2-1 for a pinout
diagram of the remote voltage monitoring connector. Connect the reference
lead of the voltmeter to one of the ground pins. Compare each voltage
reading to the values listed in Table 2-2.
Note
Use the rear-panel 9-pin D-SUB connector to check voltages only. Do not use the
connector to supply power to external devices.
If the voltages fall within the specified ranges, the chassis complies with the
CompactPCI voltage-limit specifications.
Table 2-2.
Power Supply Voltages at Voltage Monitoring Connector (DB-9)
Pin
Supply
Acceptable Voltage Range
2
+5 V
4.75 to 5.25 V
4
+3.3 V
3.135 to 3.465 V
6
+12 V
11.4 to 12.6 V
8
–12 V
–12.6 to –11.4 V
1, 9
Logic Ground
0 V
