National Instruments BNC -2140 - Manual (Page 13)

Chapter 3 Signal Connections
BNC-2140 User Manual 3-2 ni.com
I/O Connectors
Table 3-1 describes the pin assignments for the six external I/O BNC
connectors.
Table 3-1. BNC Analog I/O Connector Signal Descriptions
Signal Name Reference Direction Description
+ACH<0..3> AIGND Input +Analog Input Channel 0 through 3—Each channel
can have ICP enabled or disabled. This signal passes
through the BNC internal conductor.
–ACH<0..3> AIGND Input –Analog Input Channel 0 through 3—In SE mode
the inverting (–) terminal is tethered to ground
through a 50
Ω resistor. This signal passes through
the external BNC shell.
+DAC0OUT –DAC0OUT Output +Analog Output Channel 0—This pin supplies the
analog non-inverting output channel 0. This signal
passes through the internal BNC conductor.
–DAC0OUT +DAC0OUT Output –Analog Output Channel 0—This pin supplies the
analog inverting output channel 0. This signal
passes through the external BNC shell. In SE mode,
the inverting (–) terminal is tethered to ground
through a 50
Ω resistor.
+DAC1OUT –DAC1OUT Output +Analog Output Channel 1—This pin supplies the
analog non-inverting output channel 1. This signal
passes through the internal BNC conductor.
–DAC1OUT +DAC1OUT Output –Analog Output Channel 1—This pin supplies the
analog inverting output channel 1. This signal
passes through the external BNC shell. In SE mode,
the inverting (–) terminal is tethered to ground
through a 50
Ω resistor.