RTC
®
5 PC Interface Board
Rev. 1.9 e
10 Commands And Functions
391
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Comments
• When interpreting the status values returned by
read_status
, always take into account
the programmed loading or execution processes of the lists. Under some circum-
stances, the status values can be misleading, as illustrated by the following examples:
– Even during a loading process, a list’s LOAD status can already have been reset and
its READY status set if – after loading of a
command into a list – fur-
ther list commands are loaded into the same list.
– The status values remain unchanged if a
with another command (READY is not reset).
– If – during a loading process– a
command is processed at the same
time in the same list, then the list is regarded as already processed (USED status set),
even though it will still be newly loaded (USED was then initially reset).
– Even if a completely loaded command list (incl.
) has been stored, a
list’s READY status can be reset if the input pointer was newly set (e.g. via
) into the list. Then a list’s USED status can be reset too, even
though a completely loaded and already processed command list is stored.
– For jumps from one list area to another (“List 1” <-> “List 2”, e.g. via
) during execution, the USED status values of both lists (unlike their
BUSY status values) remain unchanged and are therefore not meaningful.
• If the list status is queried during processing of a subroutine in the protected buffer area
(“List 3”), then the status will be returned of the list (“List 1” or “List 2”) in which the
output pointer most recently resided (typically from where the subroutine was origi-
nally called).
• If list execution is interrupted (via
mentioned status values will remain unchanged.
• The list execution statuses BUSY and PAUSED (see
"List Execution Status", page 73
) can
be queried via
.
• To read the status signals from the
scan heads
.
RTC
®
4
RTC
®
5 essentially unchanged functionality, however:
the RTC
®
5 also provides a USED status
References
Ctrl Command read_user_data
Function
queries the status information currently returned from the scan system via the user data
bit.
Comments
• Up to now, this command has no effect, but it is reserved for future use according to
chapter 7.3.6 "Status Monitoring and Diagnostics", page 127
"Configuring Status Return Behavior", page 153
References
Ctrl Command read_status