The Agilent 816x VXIplug&play Instrument Driver

Error Handling

Error Handling

Events and errors within a instrument control program can be detected by polling (querying) the instrument. Polling is used in application development environments (ADEs) that do not support asynchronous activities where callbacks can be used.

Programs can set up and use polling as shown below.

1Declare a variable to contain the function completion code.

ViStatus errStatus;

Every driver function returns the completion code ViStatus.

If the function executes with no I/O errors, driver errors, or instrument errors, ViStatus is 0 (VI_SUCCESS).

If an error occurs, ViStatus is a negative error code.

Warnings are positive error codes, and indicate the operation succeeded but special conditions exist.

2Enable automatic instrument error checking following each function call.

hp816x_errorQueryDetect (instrumentHandle, VI_TRUE);

When enabled, the driver queries the instrument for an error condition before returning from the function.

If an error occurred, errStatus (Step 1) will contain a code indicating that an error was detected (hp816x_INSTR_ERROR_DETECTED).

3Check for an error (or event) after each function.

errStatus = hp816x_cmd(instrumentHandle, "SENS1:POW:RANG");

check(instrumentHandle, errStatus);

After the function executes, errStatus contains the completion code.

The completion code and instrument ID are passed to an error checking routine. In the above statement, the routine is called 'check'.

4Create a routine to respond to the error or event. This example queries whether an error has occured, checks if the error is an instrument error and then checks if the error is a driver error.

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Agilent 8163A/B, 8164A/B & 8166A/B Mainframes, Fifth Edition

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Agilent Technologies 8163A, B Error Handling, 230, Check for an error or event after each function, ViStatus errStatus
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8163A, 8164A, 8166A, B specifications

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