Campbell Scientific PC400 Datalogger Support Software - Manual (Page 32)

Section 4. The PC400 Main Screen
Note that a control port must first be configured for output in the
datalogger program before it can be toggled on or off.
Consequently, if you select a port and it doesn’t appear to
change, your program may not have the port configured for
output (refer to your datalogger operator’s manual).The CR500
and CR510 have two control ports, but only one of the ports,
control port 1, can be configured for output. Therefore, control
port 2 cannot be toggled on or off. It is included on the display so
that you can monitor its status. NOTE
A Boolean variable is a variable that can have one of two states:
high/low, off/on, -1/0, true/false. Variables for CRBasic
dataloggers can be declared as Boolean with the Public or Dim
statement. NOTE
4.4 Collect Data Tab
If you have connected to a datalogger, PC400 enables the Collect Data tab to
provide for manual data collection. PC400 shows the possible final storage
areas for mixed-array dataloggers, and the tables stored in table-based
dataloggers.
Example of Collect Data tab for a mixed-array CR10X:
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