PPoll Function

Owning Palette: GPIB 488.2 Functions

Requires: Base Development System

Performs a parallel poll.

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

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	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.
	error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
	parallel poll byte is the result of the parallel poll. Each bit of the poll result returns one bit of status information from each device configured for parallel polls. The state of each bit, 0 or 1, and the interpretation of these states are based on the latest parallel poll configuration sent to the devices and on the individual status of the devices.
	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 Bit Numeric Value Symbolic Status Description 0 1 DCAS Device Clear state 1 2 DTAS Device Trigger State 2 4 LACS Listener Active 3 8 TACS Talker Active 4 16 ATN Attention Asserted 5 32 CIC Controller-In-Charge 6 64 REM Remote State 7 128 LOK Lockout State 8 256 CMPL Operation Completed 12 4096 SRQI SRQ Detected while CIC 13 8192 END EOI or EOS Detected 14 16384 TIMO Timeout 15 -32768 ERR Error Detected
	error out contains error information. This output provides standard error out functionality.