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Connect Channels (Connect Channels (Single)) (G Dataflow)

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Last Modified: September 16, 2017

Creates a path between two channels. NI-SWITCH calculates and uses the shortest path between the two channels.

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Note

Paths are bidirectional. For example, if a path exists between CH1 and CH2, then the path also exists between CH2 and CH1.

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session in

Control that identifies a particular NI-SWITCH session established with the niSwitch Initialize With Topology node, the niSwitch Initialize With Options node, or the niSwitch Initialize node.

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error in

Error conditions that occur before this node runs.

The node responds to this input according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error error in contains an error
If no error occurred before the node runs, the node begins execution normally.

If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

Default: No error

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channel 1

One of the channel names of the desired path. Pass the other channel name as channel 2.

Examples of valid channel names are ch0, com0, ab0, r1, c2, and cjtemp.

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channel 2

One of the channel names of the desired path. Pass the other channel name as channel 1.

Examples of valid channel names are ch0, com0, ab0, r1, c2, and cjtemp.

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session out

Indicator that identifies a particular NI-SWITCH session established with the niSwitch Initialize With Topology node, the niSwitch Initialize With Options node, or the niSwitch Initialize node and used for all subsequent NI-SWITCH calls.

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error out

Error information.

The node produces this output according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error error in contains an error
If no error occurred before the node runs, the node begins execution normally.

If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

Errors

If a path is unavailable between the two channels, NI-SWITCH returns the following errors:

Error Description
Explicit Connection Exists The channels have already been explicitly connected by calling either this node or the niSwitch Set Path node.
Is Configuration Channel One of the channels is a configuration channel. Error elaboration contains information about the sources connected to channel 1 and channel 2.
Attempt to Connect Sources Both channels are connected to a source. Error elaboration contains information about the sources connected to channel 1 and channel 2.
Cannot Connect to Itself Channel 1 and channel 2 are identical.
Path Not Found No paths between channel 1 and channel 2 are available.
Resource In Use Channel 1 and/or channel 2 is in use. This error often occurs when one of the channels is set as a configuration channel and is in use or if one of the channels is a common multiplexer channel is in use.

Where This Node Can Run:

Desktop OS: Windows

FPGA: Not supported

Web Server: Not supported in VIs that run in a web application

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