V-Link 200 wireless node

Introducing our most advanced and high-performing wireless node to date. The V-Link®- 200 is LORD Sensing’s new wireless 8-channel analog input sensor, ideal for precise measurement of a variety of conditions—everything from voltage to acceleration.

Product Highlights

  • 8x higher sample rate (up to 4,096 Hz)
  • 4x more resolution (18-bit)
  • Dual power options (long-life battery and hardwired)
  • Four ±150 mVDC fully differential inputs
  • Four ±10 VDC single-ended inputs
  • Onboard memory for 8m data points
Datasheet Manual Software
Where to Buy?
U.S. International OEM

High Performance

Lossless data throughput and node-to-node sampling synchronization of ±50 μS in LXRS®-enabled modes

High resolution data with 18-bit A/D converter

Wireless range up to 1.5 km (500 m typical)

Ease of Use

Scalable networks for easy expansion

Rapid deployment with wireless framework

Remote configuration, acquisition, and display of sensor data with SensorConnect™

Optional web-based SensorCloud™ platform optimizes data storage, viewing, alerts, and analysis

Easy custom integration with open-source, comprehensive communications and command library

Cost Effective

Reduction of costs associated with wiring

Low-cost per channel with 8 input channels per node

General

Sensor input channels

Differential analog, 4 channels

Single-ended analog, 4 channels

Integrated sensors

Internal temperature, 1 channel

Data storage capacity

16 M Bytes (5+ million data points)

Analog Input Channels

Selectable measurement ranges

Differential: ±1.22 mV to ±156 mV DC (bridge completion factory-configurable)

Single-ended: ±2.56 V dc, ±5.12 V dc, ±10.24 V DC, 0 to 5.12 V dc, 0 to 10.24 V dc

Single-ended Input Impedence

1 Mohm

Input bandwidth

DC-4000 Hz (-3 dB cutoff)

Accuracy

± 0.1% full scale typical

Noise

± 0.02% full scale

ADC Resolution

18 bit

Temperature stability

0.1 % full scale over temperature range

Anti-aliasing filter

Differential Inputs: 128 to 4 kHz, Sallen-Key

Single-ended Inputs: -3dB at 15kHz, Two-pole

Bridge excitation voltage

+ 4.096 V dc (150 mA max)

Measurement gain and offset

User-selectable in software on differential channels gain values from 16 to 2048

Integrated Temperature Channel

Measurement range

-40 °C to 85 °C

Accuracy

± 1 °C (at 25 °C) typical

Resolution

0.1 °C

Sampling

Sampling modes

Synchronized, low duty cycle, datalogging, event-triggered

Sampling rates

Continuous sampling: 1 sample/hour to 4 KHz*

Periodic burst sampling: 32 Hz to 8 KHz*

Datalogging: 32 Hz to 4096 Hz

Sample rate stability

± 5 ppm

Network capacity

Up to 127 nodes per RF channel depending on sampling settings. Refer to the system bandwidth calculator: http://www.microstrain.com/configure-your-system

Synchronization between nodes

± 50 μsec

Operating Parameters

Wireless communication range

Outdoor/line-of-sight: 1.5 km (ideal), 800 m (typical)**

Indoor/obstructions: 250 m (typical)**

Radio frequency (RF) channel allocation

2.405 to 2.470 GHz spread spectrum over 14 channels

 

RF communication protocol

IEEE 802.15.4, FSK/GMSK

RF transmit power

User-set from 0dBm to 20 dBm. CE limits maximum transmit power to 10 dBm in EU

RF receive sensitivity

-99.4 dBm

RF transmission rate

250 kbps

Power source

Internal: 4 replaceable 3.6 V DC, 2.4 Ah Lithium AA-cell batteries

External: +7.5 to +36V DC

Operating temperature

-40 ˚C to + 85 ˚C

Acceleration limit

100 g

Physical Specifications

Dimensions

129 mm x 82.5 mm x 31 mm

Weight

283 grams (with batteries), 217 grams (without batteries)

Environmental rating

Indoor use

Enclosure material

Molded polycarbonate

Integration

Mounting

Bolt-down or DIN-rail mount

Compatible gateways

All WSDA® base stations and gateways

Compatible sensors

Differential analog sensors, -10 to +10 V DC analog sensors

Connectors

Screw terminal block (M4 circular connectors on IP67 faceplate)

Shunt calibration

Internal shunt calibration resistor 499 KΩ, differential channels

Software

SensorCloud™, SensorConnect™, Windows 7 (or newer)

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), CE, ROHS

*Divide maximum rate by number of active channels
** Line of sight with antenna at 3 meters

Mechanical Drawing

Firmware

When you open the SensorConnect application you will find an icon in the top right corner of the window that looks like 3 horizontal lines:

When this icon is highlighted in orange that indicates that an update is available.  Click on the icon and select “update available”:

This will direct you to the location of the SensorConnect downloads page on the MicroStrain website.

Click on the download that corresponds to your system’s configuration (64-bit vs. 32-bit).  Once the download has completed double click the “SensorConnect_X.X.X.msi” file to run the installation.  Follow the on-screen prompts to perform the update.  Note:  SensorConnect will need to be closed in order to complete the installation.

When you re-open SensorConnect the icon in the top right corner or the window should no longer be highlighted in orange, indicating that you are running the latest version of the application.

The 200 series wireless nodes have 16 Mbytes of datalogging memory.  

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, sample rate, and data type. Here are two examples:

V-Link-200 set so that channel 1 is enabled with a sample rate 2048 Hz, and data type of Float(4 byte).  Our calculation would be:

  • 1 channel x 2,048 samples per second = 2,048 data points per second
  • 2.048 data points x 4 byte float data packet = 8,192 bytes per second
  • 16 MB (rounded down) ÷ 8,192 bytes per second = 1953 seconds (rounded down)
  • 1953 seconds ÷ 60 seconds per minute = ~32 minutes to fill the memory

G-Link-200 set so that channels 1, 2 and 3 are enabled with a sample rate of 32 Hz, and data type of int24(3 byte).  Our calculation would be:

  • 3 channels x 32 samples per second = 96 data points per second
  • 96 data points x 3 byte int24 data packet = 288 bytes per second
  • 16 MB (rounded down) ÷ 288 bytes per second = 55,555 seconds (rounded down)
  • 55,555 seconds ÷ 60 seconds per minute = ~925 minutes (~15 hours) to fill the memory

The V-Link-200  has 4 strain gauge channels that come from the factory set to Full-bridge.  When ordering these units, you must specify the bridge completion for each channel.  Half and quarter bridge completions are available and channels can be mixed and matched.  These completions are accomplished in the factory as part of the final assembly, 

See the V-Link 200 user's manual http://www.microstrain.com/sites/default/files/v-link-200_user_manual_85... on how to connect strain gauges (page 44 -45), and pages 57 - 59 on how to calibrate the strain gauge to output µstrain with the V-link-200.

The % bandwidth has to do with how many nodes/channels you can use at one time.  When setting up a Synchronized Sampling network, SensorConnect will interrogate each node and assign transmission slots for them to send data to the base station.  This is designed to keep the nodes from broadcasting at the same time and causing data loss.  The more channels, and higher sample rate of a node will require more transmission slots, thus higher % of available bandwidth used.

Excel displays our time stamp incorrectly.  If you were to open the data file in Notepad you would see the correct time format. 

To correct the data in Excel, Highlight all of column A, right click on the highlighted region and select Format Cells.  Under the Number tab select Custom, Scroll to the bottom of the list that appears and select “m/d/yyyy h:mm”.  You will need to add “:ss.000” to the end of this, so it looks like this “m/d/yyyy h:mm:ss.000” .  Setting the cells to this will give you the highest resolution that Excel can show.

We use Universal Coordinated Time (UTC) to collect data on all of our devices.  There is no provision to set the time to a local time zone. 

The LORD MicroStrain V-Link-200 supports a wide range of Wheatstone bridge and analog sensors including acceleration, vibration, strain, load cells, torque, pressure, magnetic fields, displacement, etc.

As a basic function of support for these sensors, the node measures small voltages. The nodes can actually be repurposed to measure small currents. This is useful, for example, if one wanted to add the wireless capability of the nodes to a 4 to 20 mA sensor. See pages 50-51 of the V-Link 200 user's manual http://www.microstrain.com/sites/default/files/v-link-200_user_manual_85... for more information.

LORD MicroStrain® insures all products shipments to their full value unless the customer specifically states a different method.

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