niSwitch Configure Scan Trigger
Configures the scan triggers for the scan list established with niSwitch Configure Scan List.
Refer to Devices to determine if the switch module supports scanning.
This VI sets the location where the switch expects to receive an input trigger to advance through the scan list. This VI also sets the location where it generates a scan advanced signal after it completes an entry in the scan list. Details
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instrument handle identifies a particular NI-SWITCH session established with niSwitch Initialize With Topology, niSwitch Initialize With Options, or niSwitch Initialize. | ||||||||||||||||||
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scan delay specifies the minimum length of time you want the switch device to wait after it creates a path until it asserts a trigger on the Scan Advanced Output channel. NI-SWITCH uses this value to set the Scan Delay property. The scan delay is in addition to the settling time. Default value: 0.00 (seconds) |
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trigger input specifies the trigger source you want the switch module to use during scanning. NI-SWITCH uses this value to set the Trigger Input property. The default value is External. The switch module waits for a trigger at the specified location when it encounters a semicolon in the scan list. When the trigger occurs, the switch device advances to the next entry in the scan list and waits for a trigger from the location specified in trigger input.
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scan advanced output—Output terminal for the Scan Advanced Output trigger signal. NI-SWITCH uses this value to set the Scan Advanced Output property. The default value is External. After the switch processes each entry in the scan list, it waits the length of time specified in scan delay and then asserts a trigger on the line specified in scan advanced output.
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error in describes error conditions that occur before this VI or function runs.
The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurs before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.
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instrument handle out identifies a particular NI-SWITCH session established with niSwitch Initialize With Topology, niSwitch Initialize With Options, or niSwitch Initialize and used for all subsequent NI-SWITCH calls. | ||||||||||||||||||
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error out contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces.
Right-click the error out indicator on the front panel and select Explain Error from the shortcut menu for more information about the error.
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niSwitch Configure Scan Trigger Details
For synchronous scanning, set scan advanced output to None and define trigger input. For handshaking, trigger input and scan advanced output must be set.
Triggers generally originate from the SCXI or PXI trigger bus, the terminals on the front connector of the switch module, or the AUX connector on the rear of the switch module (referred to as the rear connector and supported by SCXI only).
When scanning a module that is not directly cabled to the trigger from its own front or rear connector, use niSwitch Route Trigger Input and/or niSwitch Route Scan Advanced Output to route the triggers on the cabled module to one of the backplane lines. When using these Vis to route triggers to the backplane, specify the backplane trigger location when calling niSwitch Configure Scan Trigger (even if it is the module cabled to the trigger source).