Campbell Scientific CR10X Measurement and Control System - Manual (Page 38)

SECTION 1. FUNCTIONAL MODES
1-2
1.1.2 SUBROUTINES
Table 3 is used to enter subroutines which may
be called with Program Control Instructions in
Tables 1 and 2 or other subroutines. The group
of instructions which form a subroutine starts
with Instruction 85, Label Subroutine, and ends
with Instruction 95, End (Section 12).
Subroutines 96, 97, and 98 have the unique
capability of being executed when a port goes
high (ports 6, 7, and 8 respectively). Any of
these subroutines will interrupt Tables 1 and 2
(Section 1.1.3) when the appropriate port goes
high. When the port goes high, the processor
awakes within a few microseconds. The port
triggers on the rising edge (i.e., when it goes
from low to high). If the port stays high, the
subroutine is not called again.
1.1.3 TABLE PRIORITY/INTERRUPTS
Table 1 execution has priority over Table 2. If
Table 2 is being executed when it is time to
execute Table 1, Table 2 will be interrupted.
After Table 1 processing is completed, Table 2
processing resumes at the interruption point. If
the execution interval of Table 2 coincides with
Table 1, Table 1 is executed first, then Table 2.
Interrupts by Table 1 are not allowed in the
middle of an instruction or while output to Final
Storage is in process (flag 0 is set high). The
interrupt occurs as soon as the instruction is
completed or flag 0 is set low.
Special subroutines 96, 97, and 98, initiated by
a port going high (Section 1.1.2), can interrupt
either Table 1 or 2 or can occur when neither is
being executed. These subroutines can
interrupt a table while the Output Flag is set.
When the port goes high during the execution of
a table, the instruction being executed is
completed before the subroutine is run (i.e., as
if the subroutine was called by the next
instruction).
The priority is 98, 97, 96, Table 1, Table 2. If
98, 97, and 96 are pending (ports go high at the
same time or go high during the execution of
the same instruction in one of the tables), 98 will
be executed first followed by 97 and then 96. If
the interrupt subroutine started when neither
table was running, then neither table can
interrupt it. The subroutines cannot interrupt
each other. However, when one of these
subroutines interrupts a table, it is as if the
subroutine were in the table (e.g., if 98
interrupts Table 2, either Table 1 or 97 can
interrupt it).
While a subroutine is being executed as a result
of the port going high, that port interrupt is
disabled (i.e., the subroutine must be completed
before the port going high will have any effect).
1.1.4
∗∗∗∗4 PARAMETER ENTRY TABLE
The CR10X ∗4 mode is a table with up to one
hundred values. Each value corresponds to an
instruction parameter in the datalogger
program. When the datalogger compiles the
program, values in the
∗4 table are transferred
to the corresponding instruction parameter.
The datalogger program must be created using
EDLOG which allows instruction parameters to
be assigned to the
∗4 table.
In a network of datalogger stations, the ∗4 table
can be used to simplify site customization and
the procedure of information entry. Once a
generalized program is developed, application
specific details, e.g., sensor calibration, can be
entered without accessing the
∗1 and ∗2
program tables or the
∗3 subroutine table.
ASSIGNING PARAMETERS TO
∗∗∗∗4 - EDLOG
The only way to implement the ∗4 mode is
through EDLOG. The datalogger program is
generated in EDLOG in the normal way.
To assign a parameter to a ∗4 location, position
the cursor on the desired parameter and press
the "@" key. EDLOG then prompts for the
location number in the
∗4 table to be assigned
to the associated parameter. After a valid
number is entered, EDLOG marks the
parameter with "@@nn" to the right of the
parameter description, where "nn" is the
∗4
location number.
Older versions of EDLOG (prior to Version 6.0)
may not support the
∗4 mode or may require
that the support be enabled. To enable the
∗4
mode press the F5 key followed by the "@" key
while in EDLOG's edit mode. "F5=
∗4 List" is
displayed at the top of the screen indicating that
EDLOG's
∗4 feature is active. Subsequent use
of the F5 key displays a list indicating which ∗4
locations are in use. If your copy of EDLOG is
earlier than 6.0 and it does not display "F5=
∗4
List", it is likely that that version of EDLOG does