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PROGRAMMING AND INTERFACING
Examples of some commonly returned values from the bus:
“65” indicates that the 1750 caused an SRQ due to a reading done condition. Bit #6 is set in addition
to bit #0. The decimal sum of these bits is equal to 65.
“72” indicates that the 1750 caused an SRQ due to a self-test done condition.
“80” indicates that the 1750 generated an SRQ indicating that it is ready for additional instruction.
“89” indicates the 1750 generated an SRQ due to ready, self-test, and reading done conditions.
“96” indicates an SRQ was generated by the 1750 due to an operational error.
“112” indicates that the 1750 caused an SRQ and is ready for additional instruction.
After an SRQ on the IEEE-488 bus, serial polling the bus produces a serial poll byte. If the 1750 did
not cause the SRQ, (i.e., mask bit are cleared), the poll bits will still reflect the state of the 1750.
Examples of these returned values are:
“1” = Reading Done
“8” = Self test Done
“16” = Ready for more instructions. (all commands are executed)
“32” = Error condition occurred on the 1750
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