National Instruments NI 9949 RJ-50 User manual

NI-9949

USER GUIDE
NI 9949 RJ-50 to Screw-Terminal
Accessory
This user guide describes the features of the National Instruments 9949
RJ-50 to Screw-Terminal Accessory. You can use the NI 9949 to provide
screw-terminal access to devices that use RJ-50 cables, such as the NI 9237
with RJ-50 and the SCXI-1314T.
Figure 1. NI 9949 RJ-50 to Screw-Terminal Accessory
What You Need to Get Started
To use the NI 9949, you need the following:
❑Plastic tie strap for strain relief wrapped around the two front holes,
as shown in Figure 3.
❑M4x20 screw, or other hardware that fits in the 8.9 mm (0.35 in.) outer
clearance hole and 4.6 mm (0.18 in.) inner clearance hole, as shown in
Figure 3.
S 1 3 5 7 9
S 2 4 6 8 10

NI 9949 Accessory User Guide 2 ni.com
NI 9949 Dimensions
The NI 9949 has outer dimensions of 65.6 × 21.3 × 31.5 mm
(2.58 × 0.84 × 1.24 in.), as shown in Figures 2 and 3.
Figure 2. NI 9949 Dimensions
Figure 3. NI 9949 Dimensions and Hole Clearance
Connecting the NI 9949
Use an RJ-50 cable to connect the NI 9949 to devices with RJ-50
receptacles, such as the NI 9237 with RJ-50 and the SCXI-1314T. The
NI 9949 routes each pin of the RJ-50 receptacle to the corresponding screw
terminal, where 1–10 represent the pin and terminal numbers and S
represents the shield of the RJ-50 connector. For example, if you connect
the NI 9949 to the NI 9237, pin 1 of the NI 9237 RJ-50 receptacle connects
to terminal 1 of the NI 9949 screw-terminal connector. Refer to Figure 4
for a diagram of the RJ-50 and screw-terminal connectors on the NI 9949.
Refer to the device manual for information about device pin assignments.
Note National Instruments does not recommend using an RJ-45 cable with the NI 9949
because it can physically damage pins 1 and 10 on the device, and thus permanently
disable shunt calibration no matter what connector you use.
65.6 mm (2.58 in.)
21.3 mm
(0.84 in.)
31.5 mm
(1.24 in.)
Holes for
Tie Strap Ø 4.6 mm (0.18 in.)
Ø 8.9 mm (0.35 in.)

©National Instruments Corporation 3 NI 9949 Accessory User Guide
Note You must use 2-wire ferrules to create a secure connection when connecting more
than one wire to a single terminal on the NI 9949.
Figure 4. RJ-50 and Screw-Terminal Connectors on the NI 9949
Specifications
Weight.................................................... 43 g (1.5 oz)
Operating temperature............................ –40 to 70 °C
101
S 1 3 5 7 9
S 2 4 6 8 10

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