NI ELVIS II Family Physical Channels

In physical channel names, Dev1 is the default device name for the NI ELVIS II Family device. You can change these names in MAX.

Analog Input

NI ELVIS II Family devices have 16 analog input channels, ranging from Dev1/ai0 to Dev1/ai15. You can configure the first eight channels as the positive channel of a differential pair. If N is this channel, channel N + 8 is the negative input of the pair. For instance, if you configure channel 1 in differential mode, the positive input is channel 1, and channel 9 is the negative input.

Use only the physical channel name of the positive channel (not both) when creating a differential channel.

NI ELVIS II Family devices have two oscilloscope physical channels, Dev1/scopeCh0 and Dev1/scopeCh1, available from the NI ELVIS II Family benchtop workstation. The NI ELVIS II Family benchtop workstation also has a DMM physical channel, Dev1/dmm. On the NI ELVIS II Family devices, the DMM and oscilloscope physical channels cannot be used in the same task with other channels. However, scopeCh0 and scopeCh1 can be used together.

Analog Output

NI ELVIS II Family devices have two analog outputs with analog output physical channels named Dev1/ao0 and Dev1/ao1. NI ELVIS II Family devices also have two function generator channels, Dev1/fgen and Dev1/fgenBNC, and two variable power supply channels, Dev1/vpsPos (the positive variable power supply) and Dev1/vpsNeg (the negative variable power supply). The function generator channels, Dev1/fgen and Dev1/fgenBNC, use the FGEN Create Channel function/VI. These function generator terminals also share the same resource.

Digital Input and Output

NI ELVIS II Family devices have 24 lines of digital input and output named Dev1/port0/line0 through Dev1/port0/line23. These lines belong to a single port, and the physical channel Dev1/port0 refers to all 24 lines at once. Port 0 can perform static digital operations.

NI ELVIS II Family devices have two more ports, port 1 and port 2. Port 1 has eight digital I/O lines, Dev1/port1/line0 through Dev1/port1/line7. Port 2 has seven digital I/O lines, Dev1/port2/line0 through Dev1/port2/line6. Port 1 and port 2 can be used as static digital I/O lines or PFI lines, PFI 0..14. When any of PFI lines 0..14 is used as a digital I/O signal, it uses the physical channel name shown in the following table.

PFI Signal Physical Channel Name
PFI 0 Dev1/port1/line0
PFI 1 Dev1/port1/line1
PFI 2 Dev1/port1/line2
PFI 3 Dev1/port1/line3
PFI 4 Dev1/port1/line4
PFI 5 Dev1/port1/line5
PFI 6 Dev1/port1/line6
PFI 7 Dev1/port1/line7
PFI 8 Dev1/port2/line0
PFI 9 Dev1/port2/line1
PFI 10 Dev1/port2/line2
PFI 11 Dev1/port2/line3
PFI 12 Dev1/port2/line4
PFI 13 Dev1/port2/line5
PFI 14 Dev1/port2/line6

Physical channel Dev1/port1 refers to all eight lines, Dev1/port1/line0:7, at once. Physical channel Dev1/port2 refers to all seven lines, Dev1/port2/line0:6, at once.

Counter Input and Output

NI ELVIS II Family devices have two counter/timers referred to by the physical channel names Dev1/ctr0 and Dev1/ctr1. Unlike the other I/O types, these physical channel names do not refer to terminals on the I/O connector but instead to circuits within the device. There are four primary terminals associated with each counter. These are the terminals used as the SOURCE, GATE, AUX, and OUT functions. NI-DAQmx has default values for these terminals. For counter input tasks, if you know whether your signal provides the SOURCE, AUX, or GATE function and wire your signal to the default, you do not have to set the Input Terminal attribute/property.

Counter SOURCE Default GATE Default AUX Default OUT Default
Dev1/ctr0 PFI 8 PFI 9 PFI 10 PFI 12
Dev1/ctr1 PFI 3 PFI 4 PFI 11 PFI 13

 

Note PFI 15 refers to the same terminal as dev1/fgenBNC and both cannot be used at the same time. PFI 15 is used as an external clock, as a trigger, and for counter input operations.