Xerox 3270 Programmer's Manual page 26

3270 Programmer's Guide
IBM Related Functions
If a "BUSY" signal is received but no "DESELECT", "FAULT" or
"PAPER ERROR" signal, it is handled as a busy signal. In order
to completely disable the IRQ, you must set all parameters to "00"
NOTE:
IRQ caused by printer deselect (Y46, value 2, Hold Time Out)
cannot be changed. It can be disabled by setting Y46, value 1 to 0
(IRQ because of printer error)
If IRQ caused by printer error (Y46 value 1) is set differently from
zero, then Y46 value 2 (Hold Time Out) will be sent after 10 minutes.
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