Vaisala VaiNet RFL100 User Manual page 21

Path and file
\Data\Log\Log_1h.txt
\Data\Log\Log_24h.txt
\Data\Log\Log_30d.txt
\Data\Update\
2.8 Data transfer in a VaiNet network
VaiNet protocol and VaiNet devices are designed for power-efficient operation. To save energy
VaiNet network transfers data at set intervals, which may be apparent to the user as longer
data transfer times before the data is available on viewLinc Monitoring System.
Intermittent radio connections
Access points take turns communicating in a two-minute cycle, and connected data loggers
send their measurement data to their connected access point every four minutes. This
introduces the following scenarios:
• Data loggers that are not currently connected (new devices or ones that have fallen out of
radio contact) scan for available access points for a complete cycle before they can
decide what is the optimal access point for them. Connection attempts typically take at
least a couple of minutes. Additionally, some joining scenarios may take multiple
attempts. For example, when filling a single access point up to its full capacity of 32 data
loggers, it may take an hour for the last data logger to successfully connect to the access
point.
• Access points request missing data and issue management commands to data loggers
within their communication window. Transferring a full month's worth of measurement
data from 32 data loggers using one access point takes several hours.
Data logger scanning interval
Scanning for available access points consumes power. To prevent repeated scanning from
draining their batteries, RFL100 data loggers shut down their radio temporarily if they can find
no access points to join. They will resume scanning after a waiting interval that gets
progressively longer if they keep failing to find an access point. The maximum interval is 8
hours and 30 minutes.
This means that when access points become available after an outage, it may take several
hours for data loggers to discover them. This is why you should always keep your access points
powered up, and why you should start your network installation by installing the viewLinc
Enterprise Server and access points first.
Chapter 2 – Product overview
Content
Measurement data from the
past hour.
Measurement data from the
past 24 hours.
Measurement data from the
past 30 days.
Folder for firmware update.
Copy the firmware update file
here to start the update.
19