National Instruments ni 6115-6120 User Manual

© National Instruments Corporation

Table 4-2.  Signal Descriptions for I/O Connector Pins

ACH<0..3>GND

—

—

Ground for Analog Input Channels 0 through 3—These 
pins are the bias current return point for 
pseudodifferential measurements. 

ACH<0..3>+

ACH<0..3>GND

Input

Analog Input Channels 0 through 3 (+)—These pins 
are routed to the (+) terminal of the respective channel 
amplifier and carry the input signal. 

ACH<0..3>–

ACH<0..3>GND

Input

Analog Input Channels 0 through 3 (–)—These pins are 
routed to the (–) terminal of the respective channel 
amplifier and are the DC reference for the (+) input 
signal of that channel. 

DAC0OUT

AOGND

Output

Analog Channel 0 Output—This pin supplies the 
voltage output of AO channel 0.

DAC1OUT

AOGND

Output

Analog Channel 1 Output—This pin supplies the 
voltage output of AO channel 1.

AOGND

—

—

Analog Output Ground—The AO voltages are 
referenced to this node.

DGND

—

—

Digital Ground—This pin supplies the reference for the 
digital signals at the I/O connector as well as the 
+5 VDC supply.

DIO<0..7>

DGND

Input

Output

Digital I/O Signals—DIO6 and 7 can control the 
up/down signal of general-purpose counters 0 and 1, 
respectively.

+5V

DGND

Output

+5 VDC Source—These pins are fused for up to 1 A of 
+5 V supply. The fuse is self-resetting.

SCANCLK

DGND

Output

Scan Clock—This pin pulses once for each A/D 
conversion when enabled. The low-to-high edge 
indicates when the input signal can be removed from 
the input or switched to another signal.

EXTSTROBE*

DGND

Output

External Strobe—This output can be toggled under 
software control to latch signals or trigger events on 
external devices.