Vaisala VaiNet RFL100, Руководство пользователя

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2.5 Service Port
The service port of the data logger provides a local interface for performing service actions
that cannot be done over the air, such as updating the device firmware. The service actions are
based on file transfer using Media Transfer Protocol (MTP), so no special software is needed.
The service port connector is a standard micro-USB connector.
The service port can be used to supply operating power to the data logger. Use a power
supply that fulfills the requirements listed in
Table 5 (page 13) .
Table 5 Specifications for a USB Power Supply
Property Specification
Output voltage 5 VDC
Output current min. 100 mA
Output connector Micro-USB
Certifications and approvals • Certified to IEC 60950-1 or IEC 62368-1
• Approved for use in your country
Batteries with a sufficient voltage must always be in place inside the data logger, even when
supplying external power through the service port.
When using an external power supply, the main batteries will be
drained very slowly. As alkaline batteries may leak when left in place for a long
time, always use compatible 1.5 V lithium batteries instead of alkaline batteries
when using an external power supply.
CAUTION!
2.6 Delays in a VaiNet Network
VaiNet protocol and VaiNet devices are designed for power-efficient operation. Some of the
design choices that enable long battery life also create significant delays that the users should
be aware of.
Intermittent Radio Connections
Radio connections between VaiNet access points and data loggers are not continuous. 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 various
delays:
Chapter 2 – Product Overview
13