Campbell-scientific CPEC200 Closed-Path Eddy-Covariance System Instrukcja Użytkownika Pobierz pdf (Strona 38)

CPEC200 Closed-Path Eddy-Covariance System

5.4 Configure the Program

A CR3000 datalogger program Cpec200_vx_x.cr3 is included with the

CPEC200 system. If the CPEC200 was ordered with the CR3000 factory

installed, the CPEC200 is shipped with the program installed. A copy of the

program is found on the CPEC200 Support CD (pn 26857) or can be

downloaded from www.campbellsci.com.

The CPEC200 program uses both constants and variables to customize the

behavior of the system for a particular installation. Constants are used for

parameters that must be determined when the program is compiled and

variables are used otherwise.

Constants are most easily modified using the CRBasic Editor, which is part of

the PC400 and LoggerNet datalogger support software packages. They may

also be edited with a simple text editor and uploaded to the datalogger using

PC200W, which may be downloaded from www.campbellsci.com. The

CPEC200 uses some constants as “compile switches” to define the state of the

system during compilation.

Variables may be edited while the program is running using either a keyboard

display or a PC connected through PC200W, PC400, or LoggerNet. Variables

that define the operational configuration of the system are defined as system

configuration variables. Any changes to these variables are automatically

saved in nonvolatile memory.

Modifications to the CPEC200 program (for example, to measure

additional sensors) are not recommended without first consulting

a Campbell Scientific applications engineer.

5.4.1 System Configuration Variables

Several special variables are used to configure the CPEC200. These variables

are included at the end of TABLE B-1 in Appendix B, Public Variables, and

are distinguished by all capital letters. They may be edited directly in the

public table or with the keypad display on the datalogger.

These variables are stored in the sys_conf_var.dat file so their values will be

saved and recalled if the program is recompiled. They are intended to be set

when a new system is installed but may be edited at any time. When a system

configuration variable is changed, the CPEC200 will write a message to the

message_log table and save the new values in sys_conf_var.dat. It will also

add a record to the config_history table. This section gives a brief description

of each of these variables and refers the reader to the appropriate section of the

user manual if a lengthy discussion is required.

BATT_LOWLIMIT:

If the supply voltage BattVolt falls below this value, the CPEC200 will set

BattVolt_OK = False and shut down as much of the system as possible until

the voltage recovers. BATT_LOWLIMIT must be 10.0 V to 15.0 V. The

default value for BATT_LOWLIMT is 10.0 V, which corresponds to 10.3 V

at the input terminal. This power-down feature is to protect the battery from

deep discharge cycles. The user should set BATT_LOWLIMIT as

appropriate to protect the battery. If AC main power and an AC/DC adapter

are used, the limit may be left at 10.0 V.

NOTE

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