National Instruments BNC -2140 - Manual (Page 15)

Chapter 3 Signal Connections
BNC-2140 User Manual 3-4 ni.com
Note This BNC-2140 pin assignment maps to the pin assignment of the DSA device you
are connecting to the BNC-2140. Refer to your DSA device user manual for the pin
assignments specific to your device connection.
Table 3-2 describes the signals for the internal 68-pin I/O connector.
Refer to Figure 3-1 for the pin assignments for the 68-pin connector.
Table 3-2. 68-Pin Analog I/O Connector Signal Descriptions
Signal Name Reference Direction Description
AIGND — — 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.
+ACH<0..3> AIGND Input +Analog Input Channel 0 through 3
–ACH<0..3> AIGND Input –Analog Input Channel 0 through 3
+DAC0OUT –DAC0OUT Output +Analog Output Channel 0
–DAC0OUT +DAC0OUT Output –Analog Output Channel 0
+DAC1OUT –DAC1OUT Output +Analog Output Channel 1
–DAC1OUT +DAC1OUT Output –Analog Output Channel 1
AOGND — — Analog Output Ground—The analog output
voltages are ultimately referenced to this node.
DGND — — Digital Ground—This pin supplies the reference for
the +5 VDC supply.
+5 V DGND 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
ICP circuits of the BNC-2140.
Note: For +ACH<0..3>, –ACH<0..3>, +DAC0OUT, –DAC0OUT, +DAC1OUT, and –DAC1OUT descriptions, see
Table 3-1.