Campbell Scientific CPEC200 Closed-Path Eddy-Covariance System - Manual (Page 71)

Appendix B. Public Variables
Some of the variables in the CPEC200’s CRBasic program are included in the
Public table. These public variables may be displayed or edited with a
keyboard display or PC. Other program variables are hidden from the user to
reduce clutter in the Public table. Many of these public variables are saved in
the output tables. Some of the public variables allow the user to set the
operation of the system or to give diagnostic information. The intended usage
of the public variables is categorized as follows:
IRGA measured by the EC155 gas analyzer
SONIC measured by the CSAT3A sonic anemometer
DIAG diagnostic
USER user setting
INFO provides information on system status
INFO/USER conditional user setting (may set if the sequence is stopped)
CONFIG system configuration parameter - saved in file sys_conf_var.dat.
Most of the public variables are defined all the time, but some are dependent
on compile constants. The public variables are listed in TABLE B-1.
TABLE B-1. CPEC200 public variables
When Defined Usage Variable Name Units Description
always TIMESTAMP
TS
Date and time the record was
measured
always RECORD RN Record number
always DIAG latest_note Latest note written to the
message_log table
always DIAG mode_status Operating state of the
CPEC200
always DIAG cpec_status Overall status of the CPEC200
always DIAG irga_status Status of the EC155
always DIAG sonic_status Status of the CSAT3A
always DIAG pump_status Status of the sample pump
always DIAG valve_status Status of the valve module
always DIAG EC_mode Boolean flag: True if the pump
is on and no zero/span
sequence is running
always DIAG diag_cpec CPEC200 diagnostic word
always DIAG irga_OK Boolean flag: True if no
problems are detected with the
EC155
always DIAG sonic_OK Boolean flag: True if no
problems are detected with the
CSAT3A
always DIAG pump_flow_OK Boolean flag: True if the pump
flow is within its normal range
always SONIC Ux m∙s -1 Wind velocity X component
always SONIC Uy m∙s -1 Wind velocity Y component
always SONIC Uz m∙s -1 Wind velocity Z component
B-1