The SPOLL function performs a serial poll of an IEEE-488 device and returns the serial poll response, specifying whether the device is requesting service. You specify either an I/O Path or a device selector. The computer must be the active controller and a primary device address must be specified, otherwise an error is generated. One secondary address may also be specified. For example:
Stat = SPOLL(712)
The IEEE-488 bus action is: ATN, UNL, MLA, TAG, SPE not-ATN, Read data byte, ATN, SPD, UNT.
