• RFmxBT_Initialize
• RFmxBT_SelectMeasurements
• RFmxBT_Initiate
• RFmxBT_Close
• RFmxBT_GetError
• RFmxBT_GetErrorString

int32 __stdcall RFmxBT_Initialize (char resourceName[], char optionString[], niRFmxInstrHandle *handleOut, int32 *isNewSession);

Creates an RFmx session to the device you specify through the resourceName parameter, and returns a handleOut that identifies this device in all subsequent RFmx functions.

This function is a wrapper over the NI-RFmx Instruments API, and calls the RFmxInstr_Initialize function.

Input
Name	Type	Description
resourceName	char[]	Specifies the resource name of the device to initialize. The following table shows examples of how to specify the resource name. Example # Device Type Syntax 1 myRFmxDevice NI-RFmx device, device name is "myRFmxDevice" 2 myLogicalName IVI logical name or virtual instrument, name is "myLogicalName" For NI-DAQmx devices, the syntax is the device name specified in MAX, as shown in Example 1. Typical default names for NI-DAQmx devices in MAX are Dev1 or PXI1Slot2. You can rename an NI-DAQmx device by right-clicking the name in MAX, selecting Rename from the pull-down menu, and entering a new name. You can also pass the name of an IVI logical name configured with the IVI Configuration utility. For additional information about IVI, refer to the IVI section of the Measurement & Automation Explorer Help.
optionString	char[]	Sets the initial value of certain attributes for the session. The following attributes are used in this parameter: - RFmxSetup - Simulate - AnalysisOnly For more information about attributes used in this parameter, refer to the NI RF Vector Signal Analyzers Help. The format of this string is "AttributeName=Value", where AttributeName is the name of the attribute and Value is the value to which the attribute is set. For example, you can simulate an NI 5663E using either of the following strings: "Simulate=1, RFmxSetup=Model:5663E" "Simulate=1, RFmxSetup=Model:5601; Digitizer:5622; LO:5652; LOBoardType:PXIe" To set multiple attributes, separate their assignments with a comma. To use FPGA extensions, specify the custom LabVIEW FPGA bitfile to use with the bitfile specifier within the RFmxSetup string. For example, "RFmxSetup=bitfile:yourbitfile.lvbitx" specifies that RFmx uses yourbitfile.lvbitx as the LabVIEW FPGA bitfile for the session. To use AnalysisOnly mode, specify the string as "AnalysisOnly=1". In this mode, user is responsible for waveform acquisition and NI-RFmx driver will perform analysis on user specified IQ waveform or Spectrum. Use personality specific Analyze functions to perform measurements. Note To simulate a device using the NI 5622 (25 MHz) digitizer, set the Digitizer field to 5622_25MHz_DDC and the Simulate field to 1. You can set the Digitizer field to 5622_25MHz_DDC only when using the NI 5665.
isNewSession	int32*	Returns RFMXBT_VAL_TRUE if the function created a new session, or RFMXBT_VAL_FALSE if the function returned a reference to an existing session.
Output
Name	Type	Description
handleOut	niRFmxInstrHandle*	Identifies your instrument session.

Name	Type	Description
status	int32	Returns the status code of this operation. The status code either indicates success or describes an error or warning condition. Examine the status code from each call to an RFmx function to determine if an error has occurred. To obtain a text description of the status code and additional information about the error condition, call the RFmxBT_GetError function. The general meaning of the status code is as follows:

Value	Meaning
0	Success
Positive Values	Warnings
Negative Values	Errors

int32 __stdcall RFmxBT_SelectMeasurements (niRFmxInstrHandle instrumentHandle, char selectorString[], uInt32 measurements, int32 enableAllTraces);

Enables all the measurements that you specify in the measurements parameter and disables all other measurements.

Input
Name	Type	Description
instrumentHandle	niRFmxInstrHandle	Specifies the instrument session. The RFmx driver obtains this parameter from the RFmxBT_Initialize function.
selectorString	char[]	Specifies a selector string comprising of the signal name. If you do not specify the signal name, the default signal instance is used. Examples: "" "signal::sig1" You can use the RFmxBT_BuildSignalString function to build the selector string.
measurements	uInt32	Specifies the measurement to perform. You can specify one or more of the following measurements. The default is an empty array.
enableAllTraces	int32	Specifies whether to enable all traces for the selected measurement.

Name	Type	Description
status	int32	Returns the status code of this operation. The status code either indicates success or describes an error or warning condition. Examine the status code from each call to an RFmx function to determine if an error has occurred. To obtain a text description of the status code and additional information about the error condition, call the RFmxBT_GetError function. The general meaning of the status code is as follows:

Value	Meaning
0	Success
Positive Values	Warnings
Negative Values	Errors

int32 __stdcall RFmxBT_Initiate (niRFmxInstrHandle instrumentHandle, char selectorString[], char resultName[]);

Initiates all enabled measurements. Call this function after configuring the signal and measurement. This function asynchronously launches measurements in the background and immediately returns to the caller program. You can fetch measurement results using the Fetch functions or result attributes in the attribute node. To get the status of measurements, use the RFmxBT_WaitforMeasurementComplete function or RFmxBT_CheckMeasurementStatus function.

Input
Name	Type	Description
instrumentHandle	niRFmxInstrHandle	Specifies the instrument session. The RFmx driver obtains this parameter from the RFmxBT_Initialize function.
selectorString	char[]	Specifies the signal name and result name. The result name can either be specified through this input or the resultName parameter. If you do not specify the signal name, the default signal instance is used. If you do not specify the result name in this parameter, either the result name specified by the resultName parameter or the default result instance is used. Example: "" "signal::sig1" "result::r1" "signal::sig1/result::r1" You can use the RFmxBT_BuildSignalString.
resultName	char[]	Specifies the name to be associated with measurement results. Provide a unique name, such as "r1" to enable fetching of multiple measurement results and traces. This input accepts the result name with or without the "result::" prefix. Example: "" "result::r1" "r1"

Name	Type	Description
status	int32	Returns the status code of this operation. The status code either indicates success or describes an error or warning condition. Examine the status code from each call to an RFmx function to determine if an error has occurred. To obtain a text description of the status code and additional information about the error condition, call the RFmxBT_GetError function. The general meaning of the status code is as follows:

Value	Meaning
0	Success
Positive Values	Warnings
Negative Values	Errors

int32 __stdcall RFmxBT_Close (niRFmxInstrHandle instrumentHandle, int32 forceDestroy);

Closes the RFmx session.

This function is a wrapper over the NI-RFmx Instruments API, and calls the RFmxInstr_Close function.

Input
Name	Type	Description
instrumentHandle	niRFmxInstrHandle	Specifies the instrument session. The RFmx driver obtains this parameter from the RFmxBT_Initialize function.
forceDestroy	int32	Specifies whether to destroy the NI-RFmx session.

Possible values of forceDestroy:
RFMXBT_VAL_FALSE (0)	Destroys the NI-RFmx session. Call the RFmxBT_Close function a number of times equal to the number of times you obtained a reference to the NI-RFmx session.
RFMXBT_VAL_TRUE (1)	Destroys the NI-RFmx session. You do not have to call the RFmxBT_Close function multiple times. Destroying the NI-RFmx session invalidates all references to the session.

Name	Type	Description
status	int32	Returns the status code of this operation. The status code either indicates success or describes an error or warning condition. Examine the status code from each call to an RFmx function to determine if an error has occurred. To obtain a text description of the status code and additional information about the error condition, call the RFmxBT_GetError function. The general meaning of the status code is as follows:

Value	Meaning
0	Success
Positive Values	Warnings
Negative Values	Errors

int32 __stdcall RFmxBT_GetError (niRFmxInstrHandle instrumentHandle, int32* errorCode, int32 errorDescriptionBufferSize, char errorDescription[]);

Retrieves and then clears the error information for the session or the current execution thread. You must provide a char array to serve as a buffer for the value. Pass the number of bytes in the buffer as the errorDescriptionBufferSize parameter.

If the error description, including the terminating NULL byte, is larger than the size you indicate in the errorDescriptionBufferSize parameter, the function copies buffer size - 1 bytes into the buffer, places an ASCII NULL byte at the end of the buffer, and returns the buffer size you must pass to get the entire value. For Example, if the value is "123456" and the buffer size is 4, the function places "123" into the buffer and returns 7.

If you want to call this function just to get the required buffer size, you must pass 0 for errorDescriptionBufferSize and NULL for the errorDescription buffer.

Note  Use the RFmxBT_GetErrorString function if the RFmxBT_GetError function does not return an error message.

Input
Name	Type	Description
instrumentHandle	niRFmxInstrHandle	Specifies the RFmx session. If a valid session handle is passed, the last error stored in that session is retrieved. You can pass NULL to retrieve the last error stored in the current execution thread.
errorCode	int32*	Returns the error code for the session or execution thread. If you pass 0 for the errorDescriptionBufferSize parameter, you can pass NULL for the errorCode parameter.
errorDescriptionBufferSize	int32	Passes the number of bytes in the char array you specify in the errorDescription parameter. If the error description, including the terminating NULL byte, contains more bytes than you indicate in this parameter, the function copies errorDescriptionBufferSize ? 1 bytes into the buffer, places an ASCII NULL byte at the end of the buffer, and returns the size of the buffer that you must pass to get the entire value. For example, if the value is "123456" and the buffer size is 4, the function places "123" into the buffer and returns 7.
errorDescription	char[]	Returns the error description for the session or execution thread. If there is no description, this function returns an empty string. The buffer must contain at least as many elements as the value you specify with the errorDescriptionBufferSize parameter.

Name	Type	Description
statusOrRequiredSize	int32	Returns the status code of this operation. The status code either indicates success or describes an error or warning condition. Examine the status code from each call to an RFmx function to determine if an error has occurred. When the statusOrRequiredSize return value returns the buffer size, the status code is not returned. To obtain a text description of the status code and additional information about the error condition, call the RFmxBT_GetError function. The general meaning of the status code is as follows:

Value	Meaning
0	Success
Positive Values	Warnings
Negative Values	Errors

int32 __stdcall RFmxBT_GetErrorString (niRFmxInstrHandle instrumentHandle, int32 errorCode, int32 errorDescriptionBufferSize, char errorDescription[]);

Converts a status code returned by an RFmxBT function into a user-readable string. You must provide a char array to serve as a buffer for the value. Pass the number of bytes in the buffer as the errorDescriptionBufferSize parameter.

If the error description, including the terminating NULL byte, is larger than the size you indicate in the errorDescriptionBufferSize parameter, the function copies buffer size - 1 bytes into the buffer, places an ASCII NULL byte at the end of the buffer, and returns the buffer size you must pass to get the entire value. For Example, if the value is "123456" and the buffer size is 4, the function places "123" into the buffer and returns 7.

If you want to call this function just to get the required buffer size, you must pass 0 for errorDescriptionBufferSize and NULL for the errorDescription buffer.

Input
Name	Type	Description
instrumentHandle	niRFmxInstrHandle	Specifies the instrument session. The RFmx driver obtains this parameter from the RFmxBT_Initialize function.
errorCode	int32*	Returns the error code for the session or execution thread. If you pass 0 for the errorDescriptionBufferSize parameter, you can pass NULL for the errorCode parameter.
errorDescriptionBufferSize	int32	Passes the number of bytes in the char array you specify in the errorDescription parameter. If the error description, including the terminating NULL byte, contains more bytes than you indicate in this parameter, the function copies errorDescriptionBufferSize – 1 bytes into the buffer, places an ASCII NULL byte at the end of the buffer, and returns the size of the buffer that you must pass to get the entire value. For example, if the value is "123456" and the buffer size is 4, the function places "123" into the buffer and returns 7.
errorDescription	char[]	Returns the error description for the session or execution thread. If there is no description, this function returns an empty string. The buffer must contain at least as many elements as the value you specify with the errorDescriptionBufferSize parameter.

Name	Type	Description
statusOrRequiredSize	int32	Returns the status code of this operation. The status code either indicates success or describes an error or warning condition. Examine the status code from each call to an RFmx function to determine if an error has occurred. When the statusOrRequiredSize return value returns the buffer size, the status code is not returned. To obtain a text description of the status code and additional information about the error condition, call the RFmxBT_GetError function. The general meaning of the status code is as follows:

Value	Meaning
0	Success
Positive Values	Warnings
Negative Values	Errors