These event registers are read-only, latched registers. When defined, these condition and transition registers are associated with event and enable registers. Figure 4 shows an example of a poll to wait until the instrument completes 25 data measurements before retrieving the data. I opened that one. Message 1 of 4. Serial poll is a special bus operation where the instrument controller obtains the status byte register value. As many posts have said, a timeout error can have numerous causes.

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For example, to instruct an oscilloscope to perform an autosetup routine followed by a query for the waveform data, ensure that the autosetup routine is completed before retrieving the waveform data.

An 8-bit register with mask bits that correspond to events in the Standard Event Status Register.

Therefore, if the event changes, the associated bit in the condition register also changes. Remote operation of the instrument usually: You can be notified of the occurrence of an event in the status byte register by either querying the status byte register or by a service request.

When defined, these condition and transition registers are associated gisa event and enable registers.

Before we investigate solutions, we will first identify and categorize the types of situations where more sophisticated communication is needed. Figure 6 shows how to use VISA event handling to implement command synchronization to wait until the Tektronix B oscilloscope has completed autosetup before stopping acquisitions. Nonlatched a bit in the register is set and cleared along with the condition it represents. Any tips would be useful.


When waiting for the instrument to respond with data, you can often get away with just setting a long timeout for your read operation.

Using Instrument Status Registers and Service Requests in LabVIEW

However, if possible, it is better to use Serial Poll or Service Request. Just as we categorized agiletn instrument control situations, it is convenient to categorize the different types of programmatic approaches you can use to handle the various situations.

Instrument Error Handling Some cases of Watching and Responding to Events If combined with a polling operation, can be used for other situations. How can i do with these? Additional references noted at the end of this document use these other APIs.

Query synchronization is when you want to ensure that the instrument response is ready to be read before retrieving the data from the instrument output buffer. Most message-based instrument communication is just a series of simple synchronous writes or queries to your instrument.

An Error Occurred Unable to complete the action because of changes made to the page. Reload the 34401 to see its updated state. The response to the query is a decimal value that corresponds to the binary-weighted sum of all the bits in the register.

Agilent | VISA: Initiate MEASure and CONFigure Commands for the A Read Me

All of these examples are in the Status Registers and Service Requests. This application note references several accompanying examples. The implementation details of each approach are in the following sections. Categories of Instrument Control Situations.


Although thousands of instruments perform a variety of different measurement and stimulus operations, there is commonality in the types of instrument control operations you perform. However, if you are using GPIB to control multiple instruments concurrently, all other bus activity must wait until the agilebt completes.

This is accomplished without sending a message command to the instrument.

Agilent | VISA COM: A GPIB Measure Configuration Read Me

The behavior of the message available bit differs when using the READ? Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. An 8-bit register that represents a summary of instrument events; used to assert a service request when the service request bit bit 6 is set.

When you query, the “request service” bit is not cleared. Therefore, if you are controlling multiple instruments simultaneously, use polling or service requests. It is not applicable for command synchronization or checking for instrument events, such as error conditions.

Returns a decimal value which corresponds to the binary-weighted sum of all the bits in the register.

These additional status registers are bit registers that report events specific to a particular instrument. You may receive emails, depending on your notification preferences.