National Instruments DAQ Series User Manual page 17

Chapter 3 Signal Connections
Note This BNC-2140 pin assignment maps to the pin assignment of the DSA device you
are connecting to the BNC-2140. Refer to the DSA device documentation for the pin
assignments specific to your device connection.
Table 3-2 describes the signals for the internal 68-pin I/O connector.
Table 3-2. 68-Pin Analog I/O Connector Signal Descriptions
Signal Name Reference
AI GND —
+AI <0..3> AI GND
–AI <0..3> AI GND
+AO 0 –AO 0
–AO 0 +AO 0
+AO 1 –AO 1
–AO 1 +AO 1
AO GND —
D GND —
+5 V D GND
Note: For +AI <0..3>, –AI <0..3>, +AO 0, –AO 0, +AO 1, and –AO 1 descriptions, refer to Table 3-1.
Caution Connections that exceed the maximum ratings for input or output signals on the
BNC-2140 accessory can damage the BNC-2140, any device connected to it, and the host
computer. Maximum input ratings for each signal are listed in Appendix A, Specifications.
National Instruments is not liable for any damage resulting from signal connections
exceeding maximum ratings.
BNC-2140 User Manual
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Direction
— Analog Input Ground—These pins are the reference
point for single-ended measurements in SE mode
and the bias current return point for differential
measurements.
Input +Analog Input Channel 0 through 3
Input –Analog Input Channel 0 through 3
Output +Analog Output Channel 0
Output –Analog Output Channel 0
Output +Analog Output Channel 1
Output –Analog Output Channel 1
— Analog Output Ground—The analog output
voltages are ultimately referenced to this node.
— Digital Ground—This pin supplies the reference
for the +5 VDC supply.
Output +5 VDC Source—These pins are fused for up to
0.5 A of +5 V supply on the DSA plug-in device.
The fuse is self-resetting. This source powers the
IEPE circuits of the BNC-2140.
3-4
Description
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