Campbell CR9000X, Instruction Manual

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Overview
OV-8
PC9000's Terminal Mode can also be used. Set the Comm window to your
computer’s Comm port and set the baud rate to 115200. With a serial cable
hooked between your PC's and CR9000X's RS-232 ports, press the test button
to ensure that you have established communications. Close the Comm window
and open PC9000's terminal emulator (Tools/Diagnostics/Terminal Mode).
Click in the Low Level I/O box. Press enter a few times until a CR9000>
prompt is returned. Press C and enter. The IP port configuration options will
be shown. See Sections QS1.5 and QS1.6 for additional information about
setting up the IP Port for the CR9000X and for your computer.
OV2. Memory and Programming Concepts
OV2.1 Memory
The CR9032 CPU Module in the CR9000X base system has 128 MB SDRAM
and 2 MB Flash EEPROM. The operating system, user program listing(s), and
calibration files are stored in the flash EEPROM. When the CR9000X is
powered up, the operating system, the compiled program, and any calibration
files are uploaded into SDRAM. The size of available memory may be seen in
the status file. Additional data storage is available through the use of a
PCMCIA memory card in the built-in card slot.
OV2.2 Measurements, Processing, Data Storage
The CR9000X divides a program into two tasks. The measurement task
manipulates the measurement and control hardware on a rigidly timed
sequence. The
processing task processes and stores the resulting
measurements and makes the decisions to actuate controls.
The measurement task stores raw Analog to Digital Converter (ADC) data
directly into memory. As soon as the data from a scan is in memory, the
processing task starts. There are at least two buffers allocated for this raw
ADC data (more under program control), thus the buffer from one scan can be
processed while the measurement task is filling another.
When a program is compiled, the measurement tasks are separated from the
processing tasks. When the program runs, the measurement tasks are
performed at a precise rate, ensuring that the measurement timing is exact and
invariant.