G-LINK

Product no longer stocked – limited availability
Contact for pricing and lead time--a minimum order quantity may apply

G-LINK

Discontinued

The G-Link® -LXRS® is a low-cost integrated accelerometer node with ± 2 or ±10 g measurement range and many sampling options.

Product Highlights

  • On-board high-speed triaxial ± 2 g or ± 10 g MEMS accelerometer with an internal temperature sensor
  • Wireless framework is ideal for measuring vibration, tilt, inclination, and acceleration in remote applications.
  • Supports continuous, burst, and event-triggered sampling and datalogging to internal memory
  • User-programmable sample rates up to 4096 Hz
  • 2 MB on-board non-volatile data storage
  • Simultaneously transmit real-time data and log to memory.
  • IP65/66 environmental enclosures available
Datasheet Manual Software

Wireless Simplicity, Hardwired Reliability

High Performance

  • Node-to-node synchronization up to ±32 microseconds
  • Scalable, long range wireless sensor networks up to 2 km
  • Lossless data throughput under most operating conditions

Ease of Use

  • Rapid deployment with wireless framework
  • Low power consumption allows extended use.
  • Remotely configure nodes, acquire and view sensor data with Node Commander®.
  • Optional web-based SensorCloud™ interface optimizes data storage, viewing, and analysis.
  • Easy integration via comprehensive SDK

Cost Effective

  • Reduction of costs associated with wiring
  • Volume discounts

General

Integrated sensors

Triaxial MEMS accelerometer, 3 channels

Internal temperature, 1 channel

Data storage capacity

2 M bytes (up to 1,000,000 data points, data type dependent)

Accelerometer Channels

Measurement range

± 2 g or ± 10 g standard

Accelerometer bandwidth

0 Hz to 500 Hz

Accuracy

10 mg

Resolution

12 bit

Anti-aliasing filter bandwidth

Single-pole Butterworth, -3 dB cutoff at 500 Hz (factory adjustable)

Integrated Temperature Channel

Measurement Range

-40 °C to 70 °C

Accuracy and resolution

± 2 °C (at 25 °C) typical , 12 bit

Sampling

Sampling modes

Synchronized, low duty cycle, datalogging

Sampling rates

Continuous sampling: 1 sample/hourto 512 Hz Periodic burst sampling: 32 Hz to 4096 Hz (1 channel) Datalogging: 32 Hz to 4096 Hz (1 channel)

Sample rate stability

± 3 ppm

Network capacity

Up to 2000 nodes per RF channel (and per gateway) depending on the number of active channels and sampling settings. Refer to the system bandwidth calculator: http://www.microstrain.com/configure-your-system

Synchronization between nodes

± 32 μsec

Operating Parameters

Radio frequency (RF)

transceiver carrier

2.405 to 2.470 GHz direct sequence spread spectrum over 14 channels, license free worldwide, radiated power programmable from 0 dBm (1 mW) to 16 dBm (39 mW); low power option available for use outside the U.S.A.- limited to 10 dBm (10 mW)

Range for bi-directional RF link

70 m to 2 km line of sight with RF power setting

RF communication protocol

IEEE 802.15.4

RF data downloading

4.5 minutes to download full memory

Power source

Internal: 3.7 V dc,220 mAh, rechargeable lithium polymer batteryExternal: 3.2 V dc to 9 V dc

Power consumption

See power profile :

http://files.microstrain.com/G-Link-LXRS-Power-Profile.pdf

Operating temperature

-20 ˚C to + 60 ˚C (extended temperature range available with custom battery/enclosure, -40 ˚C to + 85 ˚C electronics only)

Acceleration limit

500 g (high g option available)

Physical Specifications

Dimensions

58 mm x 43 mm x 21 mm with mounting tabs

Weight

40 grams

Environmental rating

Indoor use (IP65/66 enclosures available)

Enclosure material

ABS plastic

Integration

Compatible gateways

All WSDA® base stations and gateways

Software

SensorCloud™, Node Commander®, WSDA® Data

Downloader, Live Connect, Windows XP/Vista/7 compatible

Software development

Open-source MicroStrain Communications Library (MSCL) with sample code available in C++,Python,and.NET formats (OS and computing platform independent) http://lord-microstrain.github.io/MSCL/

Regulatory compliance

FCC (U.S.), IC (Canada), ROHS

 

What is Multipath?

Multipath is the phenomenon whereby a radio signal arrives at a receiver’s antenna by more than one path. This occurs by the reflection, diffraction, or scattering of radio waves from atmospheric ducting, reflection from water bodies or terrestrial objects (like mountains), etc.

Does Multipath impact signal strength?

Yes, multipath propagation of radio signals causes fading of the transmitted signal, which can be indicated by fluctuations in signal strength when received by the signal receiver.

How do I mitigate Multipath?

Pe-position base station or node to mitigate possible multipath interference.
Ensure a clear path to the antenna for the strongest signal, enhancing the strength of the strongest signal AND reducing the strength of the weaker signals.

Learn More: Mutipath Propagation

The WSDA-RGD (with internal GX3 inertial sensor) is configured to produce the following messages on startup.

GPS Data (1 Hz):

  • UTC Time
  • LLH Position
  • NED Velocity

AHRS Data (100 Hz):

  • Euler Angles

From this output the WSDA logs:

GPS (1 Hz):

  • latitude
  • longitude
  • height above ellipsoid
  • height above MSL
  • horizontal accuracy
  • vertical accuracy
  • speed

AHRS (100 Hz):

  • roll
  • pitch
  • yaw

The WSDA-RGD does not log any data until it gets a valid time, if it is set to get time from GPS only it will not log any output from the GX3 until the UTC timestamp from the GX3 is valid, even though the GX3 is producing valid AHRS data.

This data is not user configurable and is not available as a live stream through LiveConnect.

All LORD MicroStrain wireless sensor nodes, wireless base stations, and wireless sensor data aggregators are shipped from the factory with their radio frequency set to channel 15 (2.425 GHz).

This channel setting was established during 2012.

Previously all wireless products were set to channel 25 (2.475 GHz).

If you are mixing new nodes and base stations with older nodes and base stations, please be cognizant of these different channel settings.

The Node Discovery function of Node Commander will help you sort out which nodes are on what channels; Node Discovery is channel independent and allows the base station to communicate with any node, no matter what channel it is on

Sampling methods such as synchronized sampling, low duty cycle, network broadcast, etc. require that all nodes are on the same frequency so you will want to insure that you have adjusted the channels settings of the nodes to suit.

Microsoft Excel displays the timestamp contained in the wireless node data files incorrectly.  If you were to open the CSV file with Microsoft Notepad, you will see that the timestamp is shown properly.  In order to get Excel to show the human readable time, follow the below procedure:

  • Highlight all of column A (column with the timestamp)
  • Right click on highlighted region and select Format cells...
  • Select the Number Tab in the window that open and choose Custom from the Category box
  • Scroll to the bottom of the list in the Type box, find this entry: m/d/yyyy h:mm and click it
  • Add to the entry an :ss.000 so it now looks like this: m/d/yyyy h:mm:ss.000
  • Click OK

The timestamp will now be correct.

The wireless nodes all have 2 Mbytes of datalogging memory.  This 2 Mbytes is organized into 8,191 ‘pages’ of memory, each page holds 132 data points.  The maximum number of data points that can be held in memory can be calculated as follows: 8,191 pages x 132 data points/page = 1,081,212 total data points.

Now the question arises, ‘how long can a node datalog before its memory is full?’. The answer is that it varies depending on how many channels are being sampled and what sampling rate has been set. Here are two examples:

Let’s set a V-Link-LXRS so that channel 1 is active with a datalogging sampling rate of 2048 samples per second and we launch continuous datalogging.  Our calculation would be:

  • 1 channel x 2,048 samples per second = 2,048 data points per second
  • 1,081,212 data points / 2,048 data points per second = 527 seconds
  • 527 seconds / 60 seconds per minute = ~9 minutes to fill the memory

Let’s set a G-Link-LXRS so that channels 1, 2 and 3 are active with a datalogging sampling rate of 32 samples per second and we launch continuous datalogging.  Our calculation would be:

  • 3 channels x 32 samples per second = 96 data points per second
  • 1,081,212 data points / 96 data points per second = 11,262 seconds
  • 11,262 seconds / 60 seconds per minute = ~187 minutes to fill the memory

In FINITE sampling, the user sets a total number of samples to be taken which equates to a time period.  Because the sampling rate per second is known, the user can adjust the number of samples to be taken to determine how long the sampling period will be.

In CONTINUOUS sampling, the user does not set the total number of samples and therefore does not set the time of the sampling period.  By selecting CONTINUOUS sampling, the user is instructing the system to sample data until the user manually stops the sampling (via software), the power is cycled, the on-board datalogging memory is full, the battery dies, the power fails, etc.

LORD MicroStrain® Wireless Sensor Networks provide several data acquisition modes including:

  • Synchronized Sampling
  • Armed Datalogging
  • Streaming
  • Duty Cycle

See the particular wireless node for specifics.

 

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