Xerox 3270 用户手册

If formatting problems occur at the initial installation of the  converter,
these problems may be solved by selecting the settings matching the
appropriate IBM RPQs. However, as the RPQ settings interact to a
great extent, it is recommended that you contact your point of
purchase for details.

IRQ (Intervention Required) is a 3270 command which signals to the
host that action is required at the device (paper out, forms jam, etc. )

Function Y46, IRQ Time, allows you to adjust the period from the
error occurs until the IRQ signal  is sent to the host. The value of this
function should not be too low, as a pause may arise in the printing,
when the system fills up the printer buffer with e.g. complicated
graphics or several copies.

IRQ may be completely disabled. This can be useful as some sys-
tems will retransmit the last buffer after the intervention required
message. This means that the buffer contents will be printed twice
and that the form feed may be placed wrongly in the data stream.

Function Y46 has 3 parameters:

•

Printer error

•

Hold time out

•

Busy time out

An IRQ will be sent to the host if the time defined in one of the
parameters expires.

As the signals on the Centronics may differ from one printer to the
other and as the serial output (if supported) is not only related to the
printer but also to the serial cable used, the  converter will act
differently de pending on which printer is connected. In the following
you will find examples of how various signals are interpreted and
handled. The Centronics or serial signals are stated with capital
letters.

•

If a "FAULT" or "PAPER ERROR" signal is received by the
converter, it is handled as a  printer error.

•

If a "DESELECT" signal is received but no "FAULT" or "PAPER
ERROR", it is handled as a  hold situation.