Chapter 2 Connecting Signals
NI PXI-4224 User Manual 2-2 ni.com
Caution The PFI 0/CAL SMB connector is for low-voltage timing and calibration signals
only. Voltages greater than ±15 V can damage the device.
If you are building a 25-pin D-SUB connector for your application, make sure you use a
connector and wires that are safety rated for the voltage and category of the signals in your
application.
Table 2-1. NI PXI-4224 25-Pin D-SUB Terminal Pin Assignments
Front Connector
Diagram Pin Number Signal Names Pin Number Signal Names
* NC—No Connection
14 AI 0 – 1AI 0 +
15 AI 1 – 2AI 1 +
16 AI 2 – 3AI 2 +
17 AI 3 – 4AI 3 +
18 AI 4 – 5AI 4 +
19 AI 5 – 6AI 5 +
20 AI 6 – 7AI 6 +
21 AI 7 – 8AI 7 +
22 No Pin 9No Pin
23 NC*10 D GND
24 SPI CLK 11 MISO
25 SELECT 12 MOSI
N/A N/A 13 +5 V
14 15 16 17 18 19 20 21 22 23 24 25
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