© National Instruments | 1-13
NI cDAQ-9171/9174/9178 User Manual
The cDAQ-9174/9178 chassis also features a POWER status LED.
USB Port and Cable Strain Relief
The cDAQ chassis features a Hi-Speed USB 2.0 interface. You can provide strain relief for the
USB cable by using the jackscrew on a locking USB cable to securely attach the cable to the
chassis.
Caution (cDAQ-9171) The USB port requires a locking USB cable (part number
198506-01, 1 m, included in kit, or 780534-01, 2 m, available from
ni.com) for
hazardous locations. The USB cable must be used in a conduit or cable gland to wire
to a nonhazardous location. Do not disconnect the cable unless the cDAQ-9171 is
powered off or the area is known to be nonhazardous.
TRIG 0 (PFI 0) and TRIG 1 (PFI 1) BNC Connectors
(cDAQ-9178) Refer to the PFI section of Chapter 4, Digital Input/Output and PFI, for
information about the BNC connectors for TRIG 0 (PFI 0) and TRIG 1 (PFI 1).
Power Connector
(cDAQ-9174/9178) Refer to the specifications document for your cDAQ chassis for
information about the power connector on the cDAQ-9174/9178 chassis.
Chassis Grounding Screw
Caution To ensure the specified EMC performance, the cDAQ chassis must be
connected to the grounding electrode system of your facility using the chassis ground
terminal.
The wire should be 1.31 mm
2
(16 AWG) or larger solid copper wire with a maximum length of
1.5 m (5 ft). Attach the wire to the earth ground of the facility’s power system. For more
Table 1-2. LED State/Chassis Status
Status LED
LED Color
Green Amber Off
ACTIVE USB traffic present Unconfigured No USB traffic
present/suspend
READY Full-Speed (12 Mb/s) Hi-Speed (480 Mb/s) USB connection is not
established/suspend
POWER
*
Power supplied — No power supplied
* cDAQ-9174/9178 chassis only.
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