Chapter 6. Service Request Function
280 PACSystems* RX7i, RX3i and RSTi-EP CPU Programmer's Reference Manual GFK-2950C
6.3 SVC_REQ 2: Read Window Modes and Time Values
Use SVC_REQ 2 to obtain the current window mode and time values for the controller
communications window and the backplane communications and the background task window.
The parameter block has a length of three words. All parameters are output parameters. It is not
necessary to enter values in the parameter block to program this function.
Output
Controller Communications Window
Backplane Communications Window
Note: A window is disabled when the time value is zero.
Mode Values
The execution time of the window is limited to its respective default value
or to a value defined using SVC_REQ 3 for the controller communications
window or SVC_REQ 4 for the systems communications window. The
window will terminate when it has no more tasks to complete.
Each window will operate in a Run to Completion mode, and the CPU will
alternate among the three windows for a time equal to the sum of each
window's respective time value. If one window is placed in Constant mode,
the remaining two windows are automatically placed in Constant mode. If
the CPU is operating in Constant Window mode and a particular window's
execution time is not defined using the associated SVC_REQ function, the
default time for that window is used in the constant window time
calculation.
Regardless of the window time associated with a particular window,
whether default or defined using a service request function, the window will
run until all tasks within that window are completed.
When %Q00102 is set, the CPU places the current time values of the
windows in the parameter block starting at location %R0010.
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