DL-300 Data Logger User Manual Version 1.1.0 Aug. 2015
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Screen Lock
Users can secure a DL-300 module by setting a screen lock via the web interface. If
the lock is set, users need to enter the correct password when they would like to
configure the DL-300 module.
Automatic Baseline Correction
The built-in ABC algorithm makes the CO
2
sensor on the DL-302 and DL-303
maintenance-free. In most indoor applications, the carbon dioxide level drops to
nearly outside air - 400 ppm, and then the ABC algorithm constantly keeps track of
the lowest reading and slowly corrects it as the expected fresh air value of 400
ppm.
The ABC algorithm can not apply for the places where are no periods that the CO
2
concentration drops to background level such as greenhouses, hospitals, 24-hour
operation factories or stories. The ABC function needs be disabled where the
spaces the CO
2
concentration may be elevated at all times.
Easy Wiring
Support for RS-485, Ethernet and Power over Ethernet (PoE) interfaces for users
to choose the appropriate one to meet the field requirements.
Power over Ethernet (PoE)
The DL-300 series features true IEEE802.3af-compliant (classification, Class 1)
PoE technology that allows both power and data to be carried over a single
Ethernet cable. PoE provides a unified power system, as well as backup provisions
for critical building functions, without any additional cables, outlets or connections.
It can reduce the power supply wiring and maintenance costs, and improve system
scalability.
Support for MQTT protocol
MQTT is a protocol designed for the
efficient exchange of real-time data
with sensor and mobile devices. It
runs over TCP/IP and is in widest
use on the "machine-to-machine"
(M2M) and "Internet of Things"
applications today
Smartphone
MQTT
Broker
DL-301
DL-302
Mobile Tablet
Subscriber
