HP E1440A - Handling of Value Coupled Commands

>
else
LAST-GROUP = THIS-GROUP ;
3
else
(
/* THIS-GROUP == LAST-GROUP & LAST-GROUP != 0 */
STORE ( ) ;
3
1
Figure 4-3. Handling of Value Coupled Commands
For ease of understanding, exception handling is not shown in the
pseudo code.
In words : An execution error in EXEC() discards the current
command and sets LAST-GROUP to 0.
An execution error in CLEAN-UP() discards all pending commands
and sets LAST-GROUP to 0.
A parser error forces execution of
all pending commands and sets
LAST-GROUP to 0.
-C
Example of processing value coupled commands
Assume a program message composed of commands with the
following group assignments (sufi)
:
AO; B1; C1; DO; E2; F2; G3; H3 <CR/LF>
Such a program message would be processed in the following manner:
A
: THIS-GROUP=O, LAST-GROUP (assumed)=O, A is
executed.
B : THIS-GROUP != 0, LAST-GROUP == 0, B is made
pending.
C
: THIS-GROUP == LAST-GROUP != 0, C is made pending.
D
: THIS-GROUP == 0 != LAST-GROUP, B and C are
executed, D is executed.
E
: THIS-GROUP != 0, LAST-GROUP == 0, E is made
pending.
F : THIS-GROUP == LAST-GROUP != 0, F is made pending.
G
: THIS-GROUP != 0 != LAST-GROUP, E and F are executed,
G is made pending.
H
: THIS-GROUP == LAST-GROUP != 0, H is made pending.
<CR/LF>
: all pending commands (G and H) are executed.
4-12 Understanding the HP E1440A
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com