Campbell SAT ARGOS Bedienungsanleitung Seite 223

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Seitenansicht 222
ZENO
®
-3200 USER MANUAL
Coastal Environmental Systems (206) 682-6048
Page 215
Figure 12.1. ZENO
®
-3200 Timing Structure Diagram.
12.1.2. The ZENO
®
-3200 Internal Clock
The basis of all ZENO
®
-3200 timing is its internal clock, which is a device on the ZENO
®
-3200 CPU
board. The internal clock operates at a frequency of 16.777 MHz, meaning that the ZENO
®
-3200
requires approximately 0.119 microseconds to carry out each instruction of ZENOSOFT
®
. That may
sound like an insignificant amount of time, but each function within the ZENO
®
-3200 requires many
individual executable instructions within ZENOSOFT
®
. Hence, the amount of time that each function
requires to exercise a complete ZENO
®
-3200 configuration is very significant.
12.1.3. The Real Time Operating System
The ZENO
®
-3200 contains a Real Time Operating System (RTOS) to implement a set of rules regarding
the allocation of various computer system resources in an orderly and timely manner. System resources
include memory, communication ports, and time allocated to tasks. The timing of the RTOS is controlled
by the ZENO
®
-3200 internal clock.
252
The RTOS allows a software application to be multitasking. A multitasking software application is one in
which multiple functions are performed concurrently by a single CPU in a controlled and determined
manner. In the case of the ZENO
®
-3200, the multitasking software application is ZENOSOFT
®
.
252
Refer to Section 12.1.2.
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