Campbell Scientific CR9000X Measurement and Control System - Manual (Page 52)

Overview
OV1.3 Communication Interfaces
The CR9000X's CPU module (CR9032) has built-in RS-232 and Ethernet
ports, thus eliminating the need for expensive external communication
interfaces.
Using the CR9000X's RS232 port, any terminal emulator program can be used
to set up the CR9000X's IP address parameters. Hyper Terminal is an example
of an available terminal emulator. The computer's RS232 port settings that
should be used are listed below:
Bits per Second: 115,200
Data bits: 8
Parity: None
Stop bits:
1
Flow control: Hardware
RTDAQ'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 RTDAQ's terminal emulator (Data Logger/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. It may be required to do this recursively because
of the short time out period. The IP port configuration options will be shown.
See Sections QS1.5 Setting Up Serial Communications and QS1.6 Setting Up
IP Communications for information about setting up the IP Port.
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. 128 Kbytes of flash memory
is allocated for program storage. When the CR9000X is powered up, the
operating system, the compiled program, and any calibration files are uploaded
into SDRAM.
The amount of available memory in flash for program storage may be viewed,
using LoggerNet or RTDAQ, in the File Control window or in the Status
Table. Amount of available memory for data tables on the CPU can be viewed
in the Status Table. Additional data storage is available through the use of a
PCMCIA memory card using the built-in card slot.
It should be noted that the 128 MB SDRAM is volatile. If the
logger experiences a power failure or a watchdog error, all data
stored in SDRAM will be lost. CRITICAL DATA SHOULD
BE STORED ON THE PCMCIA CARD. NOTE
See Section 2 Data Storage and Retrieval for more on Data Storage and
Logger Memory.
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