Campbell CR6 Series, Руководство оператора

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Section 8. Operation
516
When
DevConfig
and
PakBus Graph
retrieve settings, the CR6 queries to
determine what SDC devices are connected. Results of the query can be
seen in the
DevConfig
and
PakBusGraph
settings tables. SDC queries
occur whether or not an SDC device is attached.
8.9.4 On-Board Wi-Fi — Details
Related Topics:
• On-Board Wi-Fi — Setup
(p. 159)
•
On-Board Wi-Fi — Operation
(p. 516)
To control Wi-Fi on time (to save power):
The datalogger will keep its communication interfaces on, including Wi-Fi, when
it has nothing to do (i.e. between scan intervals). There is no “sleep mode”
necessarily with Wi-Fi. There are power-saving measures it takes while it is on,
but it is either on or off. The Wi-Fi can be controlled via the setting in DevConfig
( Configuration : disable) or via program control IPNetPower() .
With IPNetPower() you can turn on the Wi-Fi with a specified timeout. The
Wi-Fi will stay on for the timeout period specified and the timeout refreshes every
time activity is detected. One simple way to do this is to put an IPNetPower ( 4 ,
True , 300 ) instruction at the top of every hour. This will keep the Wi-Fi on for
five minutes at the top of the hour. The downside is that Wi-Fi will stay on an
additional 5 minutes after comms are stopped
A more advanced way to handle this is executing an IPNetPower() instruction
like in the following program which will turn on the Wi-Fi interface at the top of
every hour (3600 seconds) with a timeout of 20 seconds. It will refresh the 20
second timer every time through the scan (every second) for the first five minutes
(300 sec) of the hour. Thus the Wi-Fi interface will stay on for at least five
minutes and then turn off 20 seconds after the last detected activity.
BeginProg
IPNetPower (4, 0) ‘Start with Wi-Fi turned off
Scan (1,Sec,0,0)
If ( TimeIsBetween (0, 300, 3600, Sec)) Then IPNetPower (4, True,
20)
…
NextScan
EndProg
This way Wi-Fi will be available at the top of every hour for a specified amount
of time.
8.10 Alternate Comms Protocols
Related Topics:
•
Alternate Comms Protocols — Overview
(p. 88)
•
Alternate Comms Protocols — Details
(p. 516)