TestSRQ Function

Determines the current state of the SRQ line.

This function is similar in format to the WaitSRQ function, except that WaitSRQ suspends itself while it waits for an occurrence of SRQ, and TestSRQ immediately returns the current SRQ state.

Refer to GPIB Function Defaults for more information about the timeout and address defaults.


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Inputs/Outputs

  • ci32.png bus —

    bus refers to the GPIB bus number. If you have only one GPIB interface in your computer, the default bus number is 0.

    Refer to the software installation instructions included with the GPIB controller for additional GPIB interfaces.
  • cerrcodeclst.png error in —

    error in describes error conditions that occur before this node runs. This input provides standard error in functionality.

  • ibool.png SRQ —

    SRQ is TRUE if the SRQ line is asserted and FALSE if it is not.

  • i1dbool.png status —

    status is a Boolean array in which each bit describes a state of the GPIB Controller.

    If an error occurs, the function sets bit 15. GPIB error is valid only if bit 15 of status is set.

    The following table shows the numeric value and symbolic status of each bit in status. This table also includes a description of each bit.
    Status BitNumeric ValueSymbolic StatusDescription
    01DCASDevice Clear state
    12DTASDevice Trigger State
    24LACSListener Active
    38TACSTalker Active
    416ATNAttention Asserted
    532CICController-In-Charge
    664REMRemote State
    7128LOKLockout State
    8256CMPLOperation Completed
    124096SRQISRQ Detected while CIC
    138192ENDEOI or EOS Detected
    1416384TIMOTimeout
    15-32768ERRError Detected
  • ierrcodeclst.png error out —

    error out contains error information. This output provides standard error out functionality.