National Instruments NI 9924 User manual

USER GUIDE AND SPECIFICATIONS
NI 9924
25-Pin DSUB to Screw-Terminal Connector Block
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2|ni.com |NI 9924 User Guide and Specifications
This user guide describes the features of the National Instruments 9924
DSUB to Screw-Terminal Connector Block. You can use the NI 9924 to
create custom cables for C Series modules that use 25-pin DSUB
connectors.
Caution Do not remove the NI 9924 circuit board from
the enclosure.
Caution Do not supply hazardous voltages
(>30 Vrms/42 Vpk/60 VDC) to the NI 9924.
Caution Before using the NI 9924, read the Operating
Instructions and Specifications for the C Series module to
ensure compliance with safety, EMC, and environmental
regulations.

NI 9924 User Guide and Specifications |© National Instruments |3
Connecting the NI 9924
The NI 9924 provides connections for C Series 25-pin DSUB
modules.
Figure 1. NI 9924 Terminal Assignments
SH
21
8
2
15
5
18
1
3
4
6
7
9
10
12
13
14
16
17
19
20
22
23
25
11
24
Pin 14
Pin 13Pin 25
Pin 1

4|ni.com |NI 9924 User Guide and Specifications
Connecting the Signals
To wire the NI 9924, complete the following steps while referring
to Figure 2.
Note When using shielded wires or cable, use the
SH terminal on the NI 9924 to terminate the shields.
1. Loosen the captive screws and remove the top cover.
2. Prepare the screw-terminal wire by stripping the insulation.
Refer to the Specifications section for more information on
screw-terminal wiring.
3. Insert the stripped end of the wire fully into the appropriate
terminal. Make sure no exposed wire extends past the screw
terminal.
4. Secure the connection by tightening the screw for the terminal.
Refer to the Specifications section for information on
screw-terminal torque.
5. Route the wire to the NI 9924 opening.
6. Remove slack in the NI 9924 wiring and secure the wires or
cable by threading a zip tie through the two strain relief holes
on the NI 9924 opening.

NI 9924 User Guide and Specifications |© National Instruments |5
7. Reinstall the top cover on the NI 9924 and tighten the four
captive screws.
Figure 2. NI 9924 Parts Locator Diagram
1 Captive Screws
2 Top Cover
3 Terminals
4 Strain Relief Holes
5 Jackscrews
2
3
4
1
5

6|ni.com |NI 9924 User Guide and Specifications
Installing the NI 9924
Connect the NI 9924 to the 25-pin DSUB connector on the module
as shown in Figure 2. Tighten the two jackscrews on the NI 9924
to hold it securely in place. Do not overtighten the jackscrews.
Refer to Figure 2 for the location of the jackscrews.
Figure 3. Installing the NI 9924

NI 9924 User Guide and Specifications |© National Instruments |7
Specifications
The following specifications are typical unless otherwise noted.
Maximum voltage............................. 30 Vrms/42 Vpk/60 VDC
Operating temperature ...................... –40 to 70 °C
Maximum current rating................... ≤1 A per channel
Screw-terminal wiring ...................... 16 to 26 AWG copper
conductor wire with 4.5 mm
(0.18 in.) of insulation
stripped from the end
Torque for screw terminals ............... 0.4 N · m max
(3.4 lb · in. max)
Weight............................................... 65 g (2.29 oz)

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