R-sensors LLC
Bldg. 1, 4, Likhachevsky proezd, Dolgoprudny, 141701, Russia
+7 (498) 744-69-95,
NDAS-N. User Manual.
7
The data logger contains circuits for powering active seismic receivers and similar low power sensors
of physical processes (external analog-to-digital converters, velocimeters, accelerometers, temperature,
pressure, humidity sensors, string piezometers, crackmeters, etc.).
To register auxiliary information from analog sensors (supply voltage, readings of microbarometer,
tilt meter, mass position sensor), the data logger has 4 low-resolution auxiliary ADC channels
(environmental channels). The data logger has a generator of analog test signals of an arbitrary shape
which is used for applying the testing signals to the connected equipment. The data logger has a software-
controlled electromagnetic relay with dry contacts for building alarm and/or emergency shutdown
circuits.
The operating modes of the data logger are displayed by means of 5 LED indicators installed on the
housing.
Connections via wired USB 2.0 and Ethernet interfaces can be used to transfer the collected
information to the consumer as well as to control the data logger and check its operation modes. With
installation of commercially available Mini PCI-E adapter modules for the corresponding
communication standard, 3G / 4G / LTE, Wi-Fi, Bluetooth, ZigBee wireless interfaces can also be used
for this purpose
1
.
The data logger contains circuits for measuring the input voltage and the total power consumption
for monitoring the operating modes and the power supply status. The operating conditions of the data
logger can be controlled by means of an integrated digital temperature and humidity sensor installed
inside the housing.
The internal clock of the data logger can be synchronized via the integrated GPS/GLONASS satellite
receiver through an Ethernet connection using NTP or PTP protocols or via the remote GPS/GLONASS
satellite receiver connecting through the RS-485 protocol.
The collected data can be recorded on the built-in non-volatile media (micro SD card or SSD drive
of a Mini PCI-E standard) as well as on external drives connected via USB 2.0. Viewing of seismograms
‘on the fly’ by means of a wired or wireless connection is possible in parallel with registration. The stored
data are marked with exact time and coordinates labels for further synchronization during processing.
Obtaining information ‘on the fly’ is possible by connecting to the data logger via the SeedLink protocol
as a node of the Seiscomp 3 networks. Information stored on the built-in non-volatile media can also be
obtained on the Ethernet via the FTP connection or on the SMB protocol as well as via USB connection
on the MTP protocol.
The data logger can be powered from a unipolar power supply with the output voltage from 7.5 to
60V of sufficient power. An Ethernet connection using Power over Ethernet (PoE) technology can also
be used to power the data logger. The maximum power consumed by the data logger depends on the
composition of the periphery equipment and does not exceed 12.95 watts in total. In addition, the limited
functionality of the data logger is provided when powered by a USB bus
2
.
The data logger is not explosive, toxic and does not serve as a source of environmental pollution.
1
Operating with 3G/4G/LTE connection requires installation of a SIM-card and making of contract with a mobile services
provider.
2
When the data logger is powered via USB connection, the internal and external USB devices, as well as the external
digital and analog sensors are not powered. The functionality of the data logger is also limited by the USB connection load
capability.
