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1. Figure 36 Strain Gauge Calibration wa LORD MicroStrain 8500 0006 Version A 54 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Troubleshooting 15 Select Finish to end the Strain Wizard Note the slope and offset values have been calculated LORD Strain Wizard LR Please enter the bridge configuration information When done hit the Calibrate button for the changes to take affect and please be patient Number of Active Gauges 4 pa Gauge Factor 2 00 v Gauge Resistance 1000 v ohm Shunt Resistance 499000 ohm Simulated Strain 250 00 Calibrate Slope 0 0380749 p strain bit Residual Offset 1184 4 p strain Click Finish to exit the wizard Figure 37 Completed Strain Wizard 16 Select OK to exit the Channel Configuration window 17 Inthe Node Configuration window select the Streaming tab Uncheck Continuous Streaming and set the Time Duration to 15 seconds 18 Select Apply to write configuration and calibration values to the node then OK to exit while acquiring sensor data may induce noise on sensitive sensor signals and l l l l l l l l Touching connected sensors and test boards or charging the node battery isnotrecommended i l l l l l l l l l l l l There are many sampling options available in the Node Commander software The following describes just one option for illustrative purposes l l l l
2. software node terminal block sensor power VDC R1 100KQ sensor signal sensor sensor signal EY x channel number Rx external resistor Figure 23 Small Voltage Measurement wa LORD MicroStrain 8500 0006 Version A 31 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Connecting Sensors 5 8 Single Ended Input Channels The V Link LXRS has three single ended input channels These channels are designed to measure voltages with reference to the system ground and can accommodate many analog sensors types including accelerometers pressure transducers geophones temperature sensors inclinometers and more These channels can also be used to measure reference voltages Sensors that operate on 3VDC can be powered with the node excitation voltage Alternately sensors can be powered with an external source See 0 to 3VDC Voltage Measurements on page 33 for an example of how to connect an external supply The single ended channels can measure signals from 0 to 3VDC with reference to the system ground Sensor output must be positive going voltage in order to operate correctly with the V Link LXRS If the sensors output is greater than 3VDC a voltage divider can be used to decrease the scale See Measuring Voltages over Three Volts on page 34 The impedance of the sensor must be less than 5KO The sensor output signal is processed in the node by a 16 bit anal
3. software If the USB gateway is plugged into the host computer prior to the software being installed simply unplug it and then plug it back in after software installation for automatic discovery wa LORD MicroStrain 8500 0006 Version A 6 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Basic Setup and Operation c For Ethernet applications connecting the gateway to a DHCP enabled network is the simplest way to establish communication If no DHCP network is available or communication cannot be established host network configuration may be required to establish communication 2 Plug the gateway power supply into the gateway and into a 120 240VAC 50 60Hz AC power source using the country adapters supplied if needed USB gateways are powered from the computer and do not require an external power source 3 Connect the sensor to the node terminal block or remove the terminal block and install the Node Tester board See Connecting Sensors on page 21 for sensor connection details or see Using the Node Tester Board on page 49 for tester board connection details An abbreviated pin diagram is included in the following figure for the connections to differential input channel 1 FF S LE connect sensors lS SE M or node tester board node W er 1 differential input pin 1 channel 1 connections node pin number signal ERES Ma s EN hl hub v AOS cable wa Pi Ar je amp 0 SG
4. such as the WSDA Base or WSDA 1000 and a software interface LORD MicroStrain has two software programs available for the Wireless Sensor Network SensorCloud and Node Commander SensorCloud is a web based data collection visualization analytical and remote management platform based on cloud computing technology SensorCloud provides the most complete functionality The Node Commander software package is also fully featured and includes all functions needed for sensor configuration and data acquisition Node Commander is included with all data gateways and is sufficient for the basic operations explained in this guide In this section hardware and software setup is described including an overview of the Node Commander software menus required to configure a sensor connected to the V Link LXRS and begin data acquisition It is intended only as a quick start guide for the node and is not a complete demonstration of the software features e For an example sensor configuration and calibration routine or for verification of system functionality see Using the Node Tester Board on page 49 e For instructions on connecting specific sensors see Connecting Sensors on page 21 To maximize operating time it is recommended that the V Link LXRS internal battery be charged fully before installation If fully discharged it takes approximately 6 to 8 hours to achieve a full charge See Charging the Node Battery
5. wa LORD MicroStrain 8500 0006 Version A 55 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Troubleshooting 19 Right click on the Node heading and then Sample Stream Start 20 As soon as Start is selected the node will start collecting data for duration of 15 seconds During that time press and release the load button on the node tester board to shunt the resistive load on and off Verify the result is as shown in the figure below The pulse value should equal tester board ohm value Testing is complete Ed Node Commander 2 10 0 t Eile View Laut Sample Synchronized Sampling Communicate Low Duty Cycle Configure Strearr Datalogging Remove Node Figure 38 Node Sampling Menu 22222981 nee Vine pa wd mo 4 e 4 no md 94 pa 14 4 Figure 39 Node Tester Output Stream F LORD MicroStrain 8500 0006 Version A 56 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Troubleshooting 7 4 Updating Node Firmware It is recommended that users continuously upgrade their devices to the latest available firmware to take advantage of improvements and to minimize or correct operating issues Node Commander version 2 7 0 or greater can be used to update any mXRS or LXRS node or gateway firmware to the most current version Updates are fo
6. 5 8 3 Measuring Small Currents 4 to 20mA Sensors Sensors with small currents such as 4 to 20mA sensors can be used with the nodes by adding a precision sampling resistor across a single ended input channel to the node Figure 26 Small Current Measurements shows an example circuit Because the sensor output can be as much as 20mA it is recommended that an external source be used to power the sensor When running on the internal node battery the node excitation can only supply 50mA to all sensors so 20mA would be a significant portion and would drain the battery quickly See Using the Internal Node Battery on page 41 for battery life and current draw information The current limitations can be mitigated by using an external power source for the sensor or the node If using node excitation power is the best for the application drain on the battery life can be limited by only switching the node excitation voltage on just before sampling and then turning it off afterward This happens automatically at low duty sampling rates 32Hz or lower and can be set up for other sample rates with external circuitry See Using the Excitation Output as a Switch on page 36 for more information KEY node terminal block x channel number Rx external resistor sensor sensor V sensor signal R1 sensor power 1 000 supply VDC pag 1 GND Figure 26 Small Current Measurements wa LORD MicroStrain 8500
7. 90dBm but it could be intermittent or result is data loss Position the node and antenna where the best RSSI value is observed Short Packet Range Test Node 3146300 Good Pings 9070 BadPings 0 Success Rate 100 00 96 4 Base RSSI 12 dBm Min 12dBm Max 10 dBm eee eee Node RSSI 12 dBm Min 12 dBm Max 10 dBm i Figure 19 Range Test Statistics F LORD MicroStrain 8500 0006 Version A 20 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Connecting Sensors 5 Connecting Sensors The V Link LXRS Wireless Sensor Node contains an WARNING internal rechargeable Lithium Polymer Li Po battery See Safety Information on page 72 for important precautions The V Link LXRS wireless sensor node features seven analog input channels that interface with a wide range of available sensors technologies essentially converting them into wireless sensors The node accommodates Wheatstone Bridge and analog sensors for applications in wireless strain gauge monitoring such as torque force and pressure measurement as well as sensors for other applications like wireless accelerometers vibration sensors magnetic field and displacement sensors Environmental sensing can be achieved with wireless RTD and wireless thermocouple monitoring The V Link LXRS includes three channels for single ended sensor measurement four channels for differential sensor measurement
8. V Link LXRS Wireless Sensor Node User Manual References Gateway The gateway is transceiver attaches to the host computer and provides communication between the software and the node s also known as a base station Host computer The host computer is the computer that orchestrates command and control of attached devices or networks LED Light Emitting Diode is an indicator light that is used in electronic equipment LOS Line of Sight is an acronym used in radio communications that describes the ideal condition between transmitting and receiving antennas in a radio network As stated it means they are in view of each other with no obstructions NIST National Institute of Standards and Testing is a nationally accepted organization for testing and calibration of technological devices Node The node is the wireless transceiver that the sensors are connected to and provides communication with the gateway The G Link LXRS V Link LXRS and SG Link LXRS are all nodes made by LORD MicroStrain Node Tester board The Node Tester board is a device designed by LORD MicroStrain that can be plugged into nodes in order to test functionality Offset When describing a mathematically linear relationship the offset is the value where the line that represents the relationship in a graph crosses the y axis The equation of a straight line is y mx b where x is the x axis coordinate y is the y axis coor
9. on page 42 for charging instructions wa LORD MicroStrain 8500 0006 Version A 4 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Basic Setup and Operation 3 1 Interface and Indicators The V Link LXRS interfaces include 1 a power input jack for charging the internal battery or externally powering the node 2 a power on off switch 3 terminal blocks for connecting sensing devices and 4 an antenna connector for attaching the node antenna The indicators on the V Link LXRS include 1 a device status indicator and 2 a battery charge status indicator The following table describes basic indicator behavior During data acquisition the device status indicator has other advanced behaviors See Device Status Indicators on page 48 terminal block antenna lt gt connection device status battery charge ON OFF indicator status indicator switch mounting tab both sides terminal blocks removed terminal block power jack Figure 3 Interface and Indicators Indicator Behavior Node Status Node battery is not currently being charged Battery Charge ON bright red Node battery is charging Status Indicator ON dim red Battery fault condition reset by unplugging power and then plugging it back in Battery is fully charged Node is OFF Device Status l Indicator Rapid flashing Node is booting up 1 second pulse approximate Node is in normal operational mode Table 2 Indicator Beh
10. the LORD MicroStrain website or contact the Sales Department LORD MicroStrain Model Number Description Part Number e Four differential channels V LINK LXRS M e Three single ended channels 6312 1000 e Internal temperature sensor Configuration Options specify at time of order e Full bridge configuration on one or more differential channels e 350Q or 1000Q half bridge completion on one or more differential channels e 350Q or 1000Q quarter bridge completion on one or more differential channels e High g force option Node operates in gravitational forces in excess of 550g wa LORD MicroStrain 8500 0006 Version A 62 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Parts and Configurations 9 2 Node Accessories The following parts are available for use with the V Link LXRS For the most current product information refer to the LORD MicroStrain website or contact the Sales Department See Sales Support on page 66 oe LORD MicroStrain Description Part Number IP66 NEMA4X rated rugged outdoor enclosure ET S nine aiomermscany 9510 Standard whip antenna FCC compliant D cell battery tray for use with wireless nodes indoor use AA cell battery tray for use with wireless nodes indoor use Table 8 Node Accessories 9 3 Recommended Sensors Many sensors can be used with the V Link LXRS The following are sensors manufactured by LORD MicroStrain and are supported fo
11. 0006 Version A 35 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Connecting Sensors 5 9 Using the Excitation Output as a Switch At low sampling rates under 32Hz the node automatically switches the excitation voltage output off when the sensor is not being sampled in order to conserve battery life This feature can also be used in applications where a sensor switch is desired such as when the sensor is powered by the internal node battery but has a large current draw It can also be used simply as a switch unrelated to the sensor such as controlling a relay or transistor The same limitations apply as to a sensor the device must operate on 3VDC and not require more than 50mA when combined with all other sensor current draw To use the excitation output in this way simply connect the control line of the device example relay coil or NPN transistor base to the excitation pin on the node terminal block SP and reference example other side of the relay coil or the NPN transistor emitter to the node ground pin GND 5 10 Thermocouples Thermocouples can be used on the differential input channels by simply adding a high impedance resistor to the input Figure 27 Connecting a Thermocouple shows an example circuit Thermocouples should be calibrated by first selecting the appropriate baseline offset range output range or gain and then applying know loads and calculating the slope and offset values Using water as
12. 43 1 7 sensors are drawing to much current The node battery can only supply 50mA to the connected sensors If an over current condition occurs the node will shut down Consider powering the node or sensors with an external source See Powering the Node on page 39 for information about node power options and see Connecting Sensors on page 21 for sensor power options wa LORD MicroStrain 8500 0006 Version A 45 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Troubleshooting Problem 2 COMMUNICATION no communication between the node and gateway 8500 0006 Version A Possible cause and recommended solution 1 8 node is damaged If all power settings and connections have been verified and the node is still unresponsive contact Technical Support See Technical Support on page 60 2 1 node or gateway is turned OFF Verify the node and gateway have power applied and applicable power switches are on Power is indicated on both devices by a status indicator LED 2 2 gateway has no communication with the computer Verify gateway communication in the software Check remove and reconnect communications and power cables as applicable 2 3 node has no communication with the gateway Verify the gateway is operational and listening for nodes when the node is powered ON If not activate node discovery feature and cycle power to the node 2 4 node is out of range Perform a bench test with the node and
13. All non warranty repairs replacements will receive a minimum charge If the repair replacement charge exceeds the minimum LORD MicroStrain will contact the customer for approval to proceed beyond the minimum with the repair replacement wa LORD MicroStrain 8500 0006 Version A 59 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Troubleshooting 7 6 Technical Support There are many resources for product support found the LORD MicroStrain website including technical notes FAQs and product manuals http Awww microstrain com support_overview aspx For further assistance our technical support engineers are standing by to help with technical and applications questions Technical Support sensing supporte LORD com Phone 802 862 6629 Toll Free 800 449 3878 Fax 802 863 4093 SKYPE microstrain wireless support Live Chat is available from the website during business hours 9 00AM to 5 00PM Eastern Time US amp Canada F LORD MicroStrain 8500 0006 Version A 60 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Maintenance 8 Maintenance There are no user serviceable parts on the V Link LXRS F LORD MicroStrain 8500 0006 Version A 61 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Parts and Configurations 9 Parts and Configurations 9 1 Standard Nodes For the most current product information custom and OEM options not listed below refer to
14. Terms and Conditions of product service Trial System To enable customers to try our products risk free LORD MicroStrain offers a 30 day return on the purchase ofa starter kit In order to take advantage of this wa LORD MicroStrain 8500 0006 Version A 65 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Parts and Configurations offer a purchase order or payment for the starter kit is required when the order is placed If the product is not suited to the application the product may be returned within 30 days from the date of receipt for a full refund excluding shipping and handling as long as the product is unaltered or undamaged Items can only be returned after LORD MicroStrain has issued an RMA Items must be packed to withstand shipping and returned freight pre paid LORD MicroStrain will inspect the items returned and issue a refund or credit once the items have been examined and are deemed to be unaltered or undamaged Non standard or custom products may only be returned with approval and a re stocking penalty may be assessed A 30 Day Return must be initiated by receiving a Return Material Authorization RMA from LORD MicroStrain 9 6 Sales Support Products can be ordered directly from the LORD MicroStrain website by navigating to the product page and using the Buy feature http www microstrain com wireless For further assistance our sales team is standing by to help with product selection o
15. Wizard Settings wa LORD MicroStrain 8500 0006 Version A 53 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Troubleshooting 13 Select Calibrate 14 Verify the calibration looks as shown in Figure 36 Strain Gauge Calibration The green line represents the output of the strain gauge With no load applied it should sit near the Auto Balance baseline value as shown and is represented by the red dashed line During calibration a shunt resistance selecting on the Parameters page is applied across the strain bridge shown by the square pulse on the output The Offset value shown with the dashed blue line is the average output value of the pulse and should sit across the top of the pulse If the gauge has not had to time to equilibrate before sampling or varying environmental factors exist spikes in the gauge output may occur and affect the Baseline and Offset values If this occurs the Offset and Baseline values can be adjusted to clip the spikes in the output values Adjust them as needed and select Accept when completed Shunt Calibration Graph p Shunt Calibration Node 31463 Channel 1 Com 3 oo Offset tm Gauge Output 25000 Haman e ur a m t ps Baseline Sweep Value a o S J I 1 1 1 0 100 200 300 400 500 600 700 800 900 1000 Sweep Number To accept calibration click Accept Baseline 31107 Offset 24541 Stop Accept Cancel
16. a 74 Me MANOS COI sai cessation AA 75 wa LORD MicroStrain Document 8500 0006 Version A SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual System Overview 1 Wireless Sensor Network Overview The LORD MicroStrain Wireless Sensor Network is a high speed scalable sensor data acquisition and sensor networking system The system consists of wireless sensor interface nodes a data collection gateway and full featured user software platforms based on the LORD MicroStrain Lossless Extended Range Synchronized data communications protocol LXRS Bidirectional wireless communication between the node and gateway enables sensor data collection and configuration from up to two kilometers away Gateways can be connected locally to a host computer or remotely on local and mobile networks The selection of available nodes allow interface with many types of sensors including accelerometers strain gauges pressure transducers load cells torque and vibration sensors magnetometers 4 to 20mA sensors thermocouples RTD sensors soil moisture and humidity sensors inclinometers orientation and displacement sensors Some nodes come optionally with integrated sensing devices Sensor sampling capabilities are IEEE 802 15 4 compliant and include lossless synchronized sampling event based or burst sampling streaming and data logging One gateway can coordinate many nodes of any type and multiple gateways can be managed from one comp
17. bridge excitation 32 Hz and below to conserve power software programmable for differential input channels from 21 to 13074 can be reduced with custom configuration Programmable offset transmit realtime data from node to PC rate depends on number of active channels and transmitting nodes sample rates and of channels are configurable For example Resolution Programmable gain Synchronized sampling mode network capacity 3 nodes 1 channel 512 Hz 15 nodes 1 channel 256 Hz 31 nodes 1 channel 128 Hz 63 nodes 1 channel 64 Hz Synchronization between nodes 32usec with 10 second beacon interval Synchronization rate stability Armed datalogging sampling rate 1 channel enabled 32 Hz to 4096 Hz 2 or more channels enabled 32 Hz to 2048 Hz Streaming sampling rates 1 channel enabled 736 Hz 3 channels enabled 617 Hz per channel 8 channels 9 p ing enabled 424Hz per channel Low duty cycle sampling rates 512 Hzto 1 sample per 60 minutes Event driven monitoring it event threshold trigger 200K bytes pre event datalogging and or Shunt calibration channels 1 to 4 internal shunt calibration resistor 499KQ 2 4 GHz direct sequence spread spectrum license free worldwide 2 405 to 2 470GHZ over 14 channels radiated power programmable from OdBm 1mW to 16dBm 39mW European models limited to 10dBm 10mW Power internal 3 7 volt 650mAh lithium ion rechargeable battery external 3 2 to 9 0VDC 20 C to 60
18. cell batteries are available for the V Link LXRS and can be used to extend battery operating capacity and duration See Node Accessories on page 63 5 4 Node Channels Designations Channel Description Pin Nomenclature UU diferenialenamen 2 diferential channet2 C a aiferentat channel a aitferentiaichanneia gg 8 singleendedchannelt__ Am 6 single ended chamelg ame 8 onboard temperature sensor channel Table 1 Channel Designations F LORD MicroStrain 8500 0006 Version A 23 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Connecting Sensors 5 5 Terminal Block Connections When inserting the sensor leads into the terminal block ensure the lead wire is being clamped under the terminal screw and not the lead insulation If the sensor wires are a very fine gauge folding and tinning them may be useful to provide more area for the terminal screw to make contact Failure to provide adequate connection may result in erroneous data Node Pin Node Pin Number Number se oe cp Signal Signal Fs se a ao o co ENENNM Aa s5 s Ang GND Table 3 Terminal Block Connections wa LORD MicroStrain 8500 0006 Version A 24 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Connecting Sensors 5 6 Pin Descriptions Signal Description Node external power supply connection An alternate to the node power jack See Po
19. gateway in close proximity to verify they are operational See Optimizing the Radio Link on page 19 for node range test and installation recommendations The node has been tested to operate up to 2km from the gateway with clear line of sight 2 5 node is not in normal start up mode Turn the node on and watch the node device status indicator See Device Status Indicators on page 48 If the node is in another start up mode it can be bypassed by toggling the node ON OFF switch rapidly three times then leaving it in the ON position for normal power up Start up mode can be changed in the software 2 6 gateway or node is damaged Verify all connections power and settings If available try installing alternate nodes and gateways one at a time to see if the faulty device can be identified If no conclusion can be determined or to send a device in for repair contact Technical Support See Technical Support on page 60 Za LORD MicroStrain 46 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Troubleshooting Problem 3 DATA ACQUISITION sensor data is missing or incorrect 8500 0006 Version A Possible cause and recommended solution 3 1 sensor is not connected correctly See Connecting Sensors on page 21 for common sensor wiring schemes and verify connections For non standard connections contact Technical Support see Technical Support on page 60 3 2 sensor channel not configured correctly Verif
20. long as it is between 0 and 3VDC For sensor outputs over 3VDC see Measuring Voltages over Three Volts on page 34 node terminal block sensor power VDC sensor output sensor sensor GND KEY x channel number x node terminal block sensor power VDC sensor sensor GND Figure 25 0 to 3VDC Measurements wa LORD MicroStrain 8500 0006 Version A 33 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Connecting Sensors 5 8 2 Measuring Voltages over Three Volts Voltages over three volts can be measured with the use of a voltage divider circuit This may be necessary if a sensor is powered from an external source The same circuit can also be used to measure reference power supplies over 3VDC The value of the voltages divider resistors will need to be determined as required for the application A 10KQ resistor is recommended for the input to the node channel leaving only one resistor to calculate as shown in the example below node terminal block voltage divider circuit input signal input GND CALCULATIONS KEY x channel number Vin maximum sensor output Rx external resistor Vout lt 3 R2 10KQ by Ohms Law 2 iy Vout Vin R er Rie Vin R2 gp Ri 2 R2 Vout EXAMPLE Vin 0to9VDC Rl 10000 a 20KQ F LORD MicroStrain 8500 0006 Version A 34 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Connecting Sensors
21. node is a quarter bridge node the setting on the tester board must be the same The configuration chart is also printed on the underside of the board The switches may come with a protective film covering them Simply peel the film off to access the switches SW 1 SW 2 SW 3 SW 4 Configuration PO PA PA Po FullBridge Full Bridge O er oe on or Quarter Bridge OFF OFF OFF ON Table 7 Tester Board Configuration wa LORD MicroStrain 8500 0006 Version A 49 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Troubleshooting The following steps describe an example of how to use the tester board to sequence through the primary functions of the node and the wireless system If the results indicated in the final steps are achieved the system is fully operational for measuring a full bridge strain gauge Other scenarios can be tested as needed 1 Setthe jumpers for Full Bridge operation using a small flat head screw driver to fully push the switch into the desired position 2 Verify the node is powered off and unplugged If installed remove the node terminal blocks from the node 3 Plug the node tester board into the node Channel 1 position gt node tester board Node channel 1 position Figure 31 Node Tester Board Installation 4 f not already set up the Wireless Sensor Network equipment and install the Node Commander software See Basic Setup and Operat
22. power supply and adapters not used with USB base station base station Figure 4 System Connections wa LORD MicroStrain 8500 0006 Version A 7 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Basic Setup and Operation 3 4 Node Communication l l l l i Nodes can be configured with the Node Commander software to boot up in different modes depending on the application This section describes how to establish communication in the normal boot mode When the node is set for l normal boot mode the device status indicator will flash rapidly and then pulse in one second intervals thereafter when powered on If any other indicator behavior is observed the node may be configured for a different mode See Device Status Indicators on page 48 for more information If the node is in another boot mode it can be bypassed by toggling the node ON OFF switch rapidly three times then leaving it in the ON position for normal power up l l OS E EE EEE a ML LM EL D IM uL EM 1 Open the Node Commander software Ban PER Node Commander 2 Power onthe data gateway 3 With the gateway plugged into the host computer communication should be established automatically In the Main window of Node Commander a list of attached gateways will populate in the left window lt a Ke Base Station Com 3 Figure 5 Node Commander Main Window F LORD MicroStrain 8500 0006 Version A 8 SENS
23. signal is processed by the analog to digital voltage converter within the node The combination of the gain offset and sensor signal voltage cannot exceed the 0 to 3VDC input range of the analog to digital converter For more information see Differential Input Gain and Offset on page 27 e Single ended sensor signal voltages can only be positive voltages with respect to the system ground and must be between 0 and 3VDC For single ended sensor signal voltages outside of that range see Measuring Voltages over Three Volts on page 34 Sensor Power e When using the internal node battery as the node power source the total current use for all connected sensors must be less than 50mA If more current is required a higher capacity external power source can be used for the node or the sensor See Sensor Power on page 23 for information about sensor power requirement considerations and options and see Powering the Node on page 39 for information regrading node power options 5 2 Wiring Recommendations In is good practice that all sensor wiring be done with shielded cable The shield is connected to the system ground at one end only to avoid ground loops For sensitive small voltage signals such as strain gauges sensor wire leads should be of matched lengths so the lead resistance for each connection is as close to each other as possible For long lengths of wire a system calibration is recommended over a sensor calibration See Sensor Cal
24. the known load medium submerging the thermocouple in ice and hot water baths is a simple method that can be used for calibration node terminal block thermocouple circuit thermocouple signal thermocouple signal KEY x channel number Rx external resistor Figure 27 Connecting a Thermocouple wa LORD MicroStrain 8500 0006 Version A 36 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Connecting Sensors 5 11 Connecting Accelerometers LORD MicroStrain bridge type accelerometers such as the Triaxial Accelerometer Cubes can be used with V Link LXRS to create wireless acceleration sensor platforms Connect each axis output to one of the node differential input channels Power is provided to the accelerometer from the node excitation supply For additional information on LORD MicroStrain accelerometers compatible for use with the V Link9 LXRS see Recommended Sensors on page 63 For information on integrating other types of sensors not described in this manual contact Technical Support see Technical Support on page 60 5 12 On board Temperature Sensor e The V Link LXRS has an on board solid state temperature sensor mounted on the surface of the circuit board e The temperature sensor output is connected to channel 8 of the V Link LXRS9 e The temperature sensor has a measurement range of 25 C to 70 C range with an accuracy of 0 5 C Q25 C e The sensor
25. to 2 25V This may be a better setting than in Example 1 because the gain is higher which could increase the resolution of the measurement The node input voltage is still within the 0 to 3V range EXAMPLE 3 Sensor signal range 0 to 50mV Gain setting 75 Baseline offset range setting Low range Calculations 50mV 75 3 75V maximum voltage of sensor signal with gain 3 75V 75mV 4 5V maximum input voltage to node with gain and offset Calculated node input over sensor range 75mV to 4 5V This setting will not work because the node input voltage is outside of the O to 3V range wa LORD MicroStrain 8500 0006 Version A 28 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Connecting Sensors 5 7 2 Differential Sensors Sensors that are classified as differential sensors often utilize a Wheatstone Bridge configuration These sensors are essentially a resistive load that use the bridge configuration to detect very small resistive changes and produce a precise voltage output as a result Some examples include strain gauge elements or strain gauge based sensors such as some load cells and pressure transducers as well as some soil moisture temperature and other sensors For use with the V Link LXRS sensors with an impedance of 35092 or 1000Q are recommended Calibration in the Node Commander software for these devices varies depending on the type of sensor and includes using the a calibration wiza
26. 006 Version A SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual 7 5 Repairand Calibration ccc sixes aa hani a a ha descent acaendcaweins 59 7 6 Technical Support ARONS TORE nee botes rci MdL i A eoa RD C A Ceo Dd Daci 60 8 Maintenance 61 9 Parts and Configurations 00 000 nr 62 9 4 Standard Nodes siss kk ba i Bl NG KG GIG KGG KGG BE 0 62 9 2 loire c C Ec EEES 63 9 3 Recommended Sensors 0 0 00 0 aaa 63 9 4 Wireless System Equipment 00 00 0000 64 9 5 Warranty Information aa a eoa Cc eu oro cules nec orae eu put eae a kala sd 65 SG ako eL p NR a ied 66 10 Specifications aaah elder ue ty p eden M Ee NM LU M LU A D Gan aa 67 10 1 Physical Specifications cece ec eee ec cee eccececcececcececcececcectececeeseees 67 10 2 Operating Specifications 0 68 10 3 Power Profile snara padding 70 10 4 Radio Specifications saka a a a Eee Ga Baba KG Laan 71 11 Safety Information eese ise treo a pi aka ea LB edule NAA 72 11 1 BatteryHazards 0 0000 0 e cece eee se se se re re ee se se se sese ene 72 11 2 User Configurable Power Settings sese eese 73 12 References esses NANG KANI ep c KG rca BG KG GG SCORE UE ewe re RO E bee DONDE ra cbe ER 74 12 1 Related D GUM Ss e eee a pecu eset iced nde
27. 1 7 601 7 264 1KQ 4 ch 19 24 32 36 40 100 243 1 913 3 008 1 279 7 602 7 264 Sample Rate wa LORD MicroStrain 8500 0006 Version A 41 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Powering the Node 6 3 Charging the Node Battery Use only the power supply specified for the node to charge the battery Using a power supply above the rated voltage could cause personal injury and permanent damage to the node See Safety Information on page 72 for important safety considerations while acquiring sensor data may induce noise on sensitive sensor signals and I I I Touching connected sensors and test boards or charging the node battery I I I is not recommended I I 1 Plug the node power supply into the node and into a 120 240VAC 50 60Hz AC power source Use only the power supply specified for the node Use the supplied power plug adapters as needed 2 Verify the charge indicator is red and on brightly to indicate charging If it is only on dimly a battery fault has occurred Reset the node by unplugging power and then plugging it back in The indicator should now turn on brightly Continue charging until that indicator turns green to indicates a completed charge Charging takes approximately 6 8 hours from a full discharge Figure 29 Node Charging wa LORD MicroStrain 8500 0006 Version A 42 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Poweri
28. 5 Repair and Calibration The V Link LXRS hasno components which require factory calibration and certification General Instructions In order to return any LORD MicroStrain product you must contact Sales or Technical Support to obtain a Return Merchandise Authorization number RMA All returned merchandise must be in the original packaging including manuals accessories cables etc with the authorization RMA clearly printed on the outside of the package Removable batteries should be removed and packaged in separate protective wrapping Please have the LORD MicroStrain model number and serial number as well as your name organization shipping address telephone number and email Normal turn around for RMA items is 7 days from receipt of item by LORD MicroStrain Warranty Repairs LORD MicroStrain warrants its products to be free from defective material and workmanship for a period ofone 1 year from the original date of purchase LORD MicroStrain will repair or replace at its discretion a defective product if returned to LORD MicroStrain within the warranty period This warranty does not extend to any LORD MicroStrain products which have been subject to misuse alteration neglect accident incorrect wiring mis programming or use in violation of operating instructions furnished by us nor extend to any units altered or repaired for warranty defect by anyone other than LORD MicroStrain Non Warranty Repairs
29. C with standard internal battery and enclosure extended temperature Operating temperature range optional with custom battery and enclosure 40 C to 85 C for electronics only Maximum acceleration limit 500 g standard high g option available Radio frequency RF transceiver carrier wa LORD MicroStrain 8500 0006 Version A 68 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Specifications Parameter Specification Dimensions 74mmx79mmx20mm wihoutantenna weim At grams Enclosure material Rois eman Compatible gateways allWSDA Base and WSDA 1000 Software SensorCloud Node Commander Windows XP Vista 7 compatible a includes data communications protocol EEPROM maps and sample code OS and sora re development OK computing platform independent rocip _XJQMSLINKO0O pic T 8505A MSLINKOODS Table 11 Operating Specification wa LORD MicroStrain 8500 0006 Version A 69 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Specifications 10 3 Power Profile Node power use is highly dependent on the number and type of sensors connected and operational parameters such as sample mode and rate More active channels and higher sample rates equate to increased power use Below is an example approximation of the power use of a V Link LXRS with four different strain gauge sensor configurations over a range of sample rates operating in Synchronized Sampling mo
30. FCC CFR 47 Part 15 and ARIB STD T66 The radio is license free worldwide Using antennas and transmission equipment other than what is provided with the node may void FCC compliance l l l l l l l l i i The default operating frequency setting for newly manufactured nodes and gateways is 2 425GHz channel 15 When using the Node Discovery feature in Node Commander the gateway listens for node broadcasts on the l l channel it is set to The node provides this broadcast only when it is initially powered on and broadcasts on all channels As long as the node is powered on after the Node Discovery feature is activated the gateway will link to itandit is not necessary to match the frequency setting of the node and gateway The gateway automatically manages nodes that are operating of different frequencies Setting channels is only required in frequency sensitive applications or when multiple gateways are attached to one host computer l l l l wa LORD MicroStrain 8500 0006 Version A 71 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Safety Information 11 Safety Information This section provides a summary of general safety precautions that must be understood and applied during operation and maintenance of components in the LORD MicroStrain Wireless Sensor Network Throughout the manual ANSI Z535 standard safety symbols are used to indicate a process or component that require
31. ING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Basic Setup and Operation 4 Right click on the Base Station Com X heading and select Add Node Node Discovery Figure 6 Adding a Node in Node Commander 5 Asthe gateway listens for available nodes turn the V Link9 LXRS9 node ON with the ON OFF switch During power up the node will transmit a message with its operating frequency This will occur within a few seconds 6 When the device status indicator on the node ends the rapid flash sequence and begins pulsing at one second intervals it has completed the power on sequence and is running in the normal operating mode At this point scanning can be stopped by selecting the Stop button in the Node Discovery window Verify the node is listed under the Base Station Additional node information can be viewed by selecting the symbol next to the node heading Please cycle the power on all nodes you d like Node Commander to find Discovered nodes will show up under Base Station Com 3 Click the stop button to leave node discovery mode I Find sampling nodes on frequency 23 Co Base Station Com 3 BB Modet V Link id Options LXRS Ae Num Triggers 2 Figure 7 Node Discovery wa LORD MicroStrain 8500 0006 Version A 9 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Basic Setup and Operation 3 5 Channel Configuration The node needs to be configu
32. LORD MicroStrain data gateway such as the WSDA Base and WSDA 1000 and either the Node Commander or SensorCloud software interfaces or a user designed program The Node Commander software is included with the gateways and allows configuration of the node Figure 2 V Link LXRS Wireless Sensor Node wa LORD MicroStrain 8500 0006 Version A 2 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Node Overview 2 1 Components List V Link LXRS sensor nodes come with the following components and options For a complete list of available configurations accessories additional system products and ordering information see Parts and Configurations on page 62 Item Description V Link LXRS Wireless Sensor Node Antenna with right angle adapter Removable terminal blocks Power supply and plug adapter kit optional Node Tester Board optional User Manual Quick Start Guide and Calibration Certificate Table 1 V Link LXRS Components List wa LORD MicroStrain 8500 0006 Version A 3 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Basic Setup and Operation 3 Basic Setup and Operation The V Link LXRS Wireless Sensor Node contains an WARNING internal rechargeable Lithium Polymer Li Po battery See Safety Information on page 72 for important precautions To acquire sensor data the V Link LXRS is used with any LORD MicroStrain data gateway
33. LORD USER MANUAL V Link LXRS Wireless 7 Channel Analog Input Sensor Node F LORD MicroStrain SENSING SYSTEMS Za LORD MicroStrain SENSING SYSTEMS 2014 LORD Corporation MicroStrain Sensing Systems 459 Hurricane Lane Suite 102 Williston VT 05495 United States of America Phone 802 862 6629 Toll Free 800 449 3878 Fax 802 863 4093 http www microstrain com sensing support GLORD com sensing sales LORD com Copyright 2014 LORD Corporation IEPE Link Torque Link 3DM RQ1 Strain Wizard DEMOD DC DVRT DVRT Link WSDA HS Link TC Link G Link V Link SG Link9 ENV Link Watt Link Shock Link LXRS9 Node Commander SensorCloud Live Connect MathEngine EH Link 3DM FAS A 3DM GX1 3DM GX3 3DM GX4 3DM DH 3DM DH3 EmbedSense MicroStrain and Little Sensors Big Ideas are trademarks of LORD Corporation V Link LXRS Wireless Sensor Node User Manual Table of Contents 1 Wireless Sensor Network Overview eene len 1 2 Node Overview ee 2 2 1 Components List AA 3 3 Basic Setup and Operation 22 JJ aaa 4 3 1 Interface and Indicators cee beeen eee eneeeeeees 5 3 2 Software Installation 0000 6 3 3 System Connections MER RR UNE 6 3 4 Node Commiialioli a ee e Sape zo a las 8 3 5 Channel Configuration 0000 nea
34. MI such as that generated by power transmission equipment microwaves switching power supplies and other electromagnetic sources e Avoid Metal Objects in close proximity to the node antenna especially ferrous metals such as steel and iron which can be problematic for wireless communications The larger the object the greater the influence If mounting on metal or near metal objects in unavoidable the antenna can be mounted remotely with an antenna cable The connector on the antenna is male reverse polarity SMA male RPSMA so a male to female RPSMA cable would be required wa LORD MicroStrain 8500 0006 Version A 19 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Node Installation 4 24 Range Test After establishing communication between node and gateway use the range test in Node Commander to monitor the signal strength and best position the node and antenna for installation 1 Right click on the node header and the select Communicate Range Test amp Base Station Com3 5 9 Node 21 463 Sample b Communicate Configure Stop Node Load Node Information Power Management gt Remove Node A Num Triggers 0 Figure 18 Range Test Menu 2 The total RSSI range for the node and gateway is 90 to 0 dBm The higher the value closer to zero the better but reliable communication can be achieved between 0 and 75dBm The devices may still communicate between 75 and
35. and an additional channel dedicated to the on board internal temperature sensor Differential channels may need to be factory set to work for specific types of sensors See Differential Input Channels on page 26 for information about channel configurations and see Parts and Configurations on page 62 for ordering information 5 1 Sensor Requirements Below are guidelines for selecting sensors for use with the V Link LXRS For interfacing with sensors outside of these parameters or not included in the examples in the following sections contact Technical Support see Technical Support on page 60 Sensor Impedance e Differential input sensors for a standard V Link LXRS should have an impedance of either 350Q or 1000Q Sensors that are 1200 are not recommended For half and quarter bridge configurations the node impedance value is set to match the sensor when the node is manufactured and must be specified at the time of order See Parts and Configurations on page 62 for more information Custom bridge completion impedance values are available on request e Single ended sensor inputs must have impedance that is less than 5KQ wa LORD MicroStrain 8500 0006 Version A 21 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Connecting Sensors Sensor Signal Voltage e The differential sensor inputs in the V Link LXRS Wireless Sensor Node include a hardware gain and offset stage before the sensor input
36. ander this can be accomplished by taking sensors readings sampling while applying known loads wa LORD MicroStrain 8500 0006 Version A 13 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Basic Setup and Operation 3 7 Data Acquisition The V Link LXRS is capable sampling in many different sampling modes and at various sampling rates See Operating Specifications on page 68 for a complete list of available sampling modes and data logging capacity In general when determining what sample mode and rate is most suitable for the application consider the following e Increasing the sample rate reduces the system bandwidth and therefore the number of nodes that can be reporting simultaneously e Increasing the sample rate increases the duration the node is on over time and therefore reduces battery life e Some sampling modes such as Streaming which is continuously recording data will use more bandwidth and battery power than fixed interval or event based polling modes such as Low Duty Cycle and Event Triggered Touching connected sensors and test boards or charging the node battery while acquiring sensor data may induce noise on sensitive sensor signals and is not recommended The following is an example of Synchronized Sampling 1 Right click on the Node heading and then Sample Synchronized Sampling a Node Commander 2 10 0 File Edit View Launch Application Help gt Base Stati
37. argeable Lithium Polymer Li Po battery See Safety Information on page 72 for important precautions When the internal node switch is set for internal power the node is powered by a rechargeable 650mAH lithium polymer battery The battery is not user serviceable Node battery life is highly dependent on the number and type of sensors connected and operational parameters such as sample mode and rate More active channels and higher sample rates equate to decreased battery life The following graph shows an example approximation of the battery life fora V Link LXRS with four different strain gauge sensor configurations over a range of sample rates operating in Synchronized Sampling mode See Power Profile on page 70 for additional V Link LXRS power specifications Battery life aproximation for V Link LXRS 650mAH internal battery 8000 Synchronized Sampling Transmit Only 7000 3500 1 ch 6000 H 3500 4 ch t 1KO 1 ch s000 1K 4 ch 4000 3000 5 e 2000 pag o 100 amp 2 o D s S 1 E sample lt 512Hz 256Hz 128Hz 64Hz 32Hz 16Hz 8Hz 4Hz 2Hz 1Hz per sleep minute 35001ch 32 44 51 54 57 125 264 1 288 2 772 1 275 7 574 7 262 H 35004ch 12 13 15 16 17 56 141 1 839 4 695 1 276 7 589 7 264 1KQ1ch 44 74 107 111 113 185 342 929 2 000 1 228
38. aviors wa LORD MicroStrain 8500 0006 Version A 5 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Basic Setup and Operation 3 2 Software Installation To install Node Commander on the host computer complete the following steps 1 Insert the CD in the host computer 2 Follow the on screen prompts The Node Commander software includes hardware drivers required for use with USB gateways Once installed the software will automatically detect and configure any USB gateways that are plugged into the host computer 3 3 System Connections To acquire sensor data the V Link LXRS is used with any LORD MicroStrain data gateway such as the WSDA Base and WSDA 1000 Although the node will communicate with any gateway the communication protocols between the gateway and host computer vary depending on which model is used The WSDA Base gateways utilize local serial connections to the host computer such as RS232 and USB The WSDA 1000 gateway utilizes Ethernet communications The following instructions describe how to connect the hardware components 1 Connect the data gateway to the host computer with the communications cable applicable to the gateway being used a For RS232 applications a USB to RS232 adapter may be used with a computer that does not have a serial port b For USB applications drivers need to be installed on the host computer These drivers are included with the Node Commander
39. cal signals that are measured with reference to a system ground Slope When describing a mathematically linear relationship the slope is the steepness of the line that represents that relationship on a graph The equation of a straight line is y mx b where x is the x axis coordinate y is the y axis coordinate m is the slope and b is the offset Streaming Streaming is a sampling mode in which all active channels and the sensors attached to them are measured and the data acquired is transmitted to the gateway and software The data is not written to non volatile memory during streaming Streaming can either be finite have a user defined start and end time or continuous continue until the power is cycled on the node USB Universal Serial Bus a serial data communications protocol Wheatstone Bridge An electrical circuit used to measure unknown electrical resistances WSN Wireless Sensor Network wa LORD MicroStrain 8500 0006 Version A 77 SENSING SYSTEMS
40. ce E 1KB Libraries 3 Documents a Music i Pictures H Videos 1M Computer amp Local Disk C Figure 16 Exploring Data F LORD MicroStrain 8500 0006 Version A 17 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Node Installation 4 Node Installation 4 1 Mounting Recommendations The V Link LXRS is rated for indoor use only unless used with the ruggedized outdoor housing The housing also accommodates two D cell batteries extending the battery operating capacity and duration of the node See Node Accessories on page 63 for more information The node has two mounting tabs with holes for fastening The terminal blocks must be removed to insert the mounting hardware The node can be mounted in any orientation but it is recommended that it is mounted in a way that optimizes the wireless communications typically with the antenna pointing upward See Optimizing the Radio Link on page 19 for more information Figure 17 Mounting the Node wa LORD MicroStrain 8500 0006 Version A 18 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Node Installation 4 2 Optimizing the Radio Link In ideal conditions the nodes and gateway can communicate up to two kilometers apart In order to accomplish this the node must be installed in a manner that optimizes the wireless transmission The V Link LXRS operates at a 2 4GHz transmission frequency and comes standard with a righ
41. de This chart can be used to approximate external node power source requirements See Using the Internal Node Battery on page 41 for V Link LXRS internal battery life specifications V Link LXRS Example Power Profile 60 Synchronized Sampling Transmit Only 4 3500 1 ch 8 35004 ch 1KO 1 ch I 1 T1 T 40 d 1K04 ch 30 Average current draw mA 20 10 0 1 T T T T T T T T T 1 sleep 1sample 1Hz 2 Hz 4Hz 8 Hz 16 Hz 32 Hz 64 Hz 128 Hz 256 Hz 512 Hz per minute Sample Rate Figure 42 Example V Link LXRS9 Power Profile F LORD MicroStrain 8500 0006 Version A 70 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Specifications 10 4 Radio Specifications TheV Link LXRS Wireless Sensor Node employs a 2 4GHz IEEE 802 15 4 compliant radio transceiver for wireless communication The radio is a direct sequence spread spectrum radio and can be configured to operate on 14 separate frequencies ranging from 2 405 GHz to 2 480GHz Following the 802 15 4 standard these frequencies are aliased as channel 11 through channel 24 For all newly manufactured nodes the default setting is equivalent to 2 425GHz channel 15 For standard models radiated transmit power is programmable from OdBm 1mW to 16dBm 39mW For European models transmit power is limited to 10dBm 10mW The radio complies with ETSI EN 300 328 EN 300 440 Class 2
42. dinate m is the slope and b is the offset Ping A byte of transmitted by the gateway to the node and the node responds by echoing the byte indicating communication exists between them PGA Programmable Gain Amplifier is an electronic device used to amplify small electrical signals Range Test A continuous string of pings used to validate communication between the gateway and the node over distance and obstruction Read Write EEPROM Commands transmitted to the node to read or write parameters stored in the node s operating system RFI Radio Frequency Interference wa LORD MicroStrain 8500 0006 Version A 76 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual References RSSI Received Signal Strength Indication is a measurement of the transmission power in a radio signal The untis are decibels per meter dBm RS232 A serial data communications protocol Sensor A device that physically or chemically reacts to environmental forces and conditions and produces a predictable electrical signal as a result Sleep A command transmitted to the node to set a node into sleep configuration Sampling The process of taking measurements from a sensor or device Sampling Mode The type of sampling that is being utilized such as event triggered continuous or periodic The nodes have several sampling modes that employ these types of sampling Sampling Rate The frequency of sampling Single Ended Electri
43. er Manual Troubleshooting 7 Troubleshooting 7 1 Troubleshooting Guide 1 POWER node does not turn on 2 COMMUNICATION no communication 3 DATA ACQUISITION sensor data is missing or does not charge T1 102 internal source select switch set incorrectly 13 wrong power supply 1 4 node battery is dead 1 5 battery fault 1 6 external power source OFF or miswired 1 7 sensors are drawing too much current 1 8 node is damaged 8500 0006 Version A between the node and gateway 21 22 gateway has no com with computer 2 3 node has no com with the gateway 2 4 node is out of range 2 5 node is not in normal startup mode 2 6 gateway or node is damaged 44 or incorrect 3 1 node power node or sensor is not switch is OFF gateway is connected turned OFF correctly 3 2 sensor channel not configured correctly 3 3 sensor calibration is invalid 3 4 sensor sampling is set up incorrectly va LORD Microstrain SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Troubleshooting See Interface and Indicators on page 5 for indicator locations on the V Link LXRS and see Device Status Indicators on page 48 for a complete summary of indicator meaning Problem Possible cause and recommended soluti
44. eral term applied to the node indicating how it is set up for data acquisition It includes settings such as sampling mode and rate number of active channels channel measurement settings offsets hardware gain and calibration values Cycle Power A command transmitted to the node to re boot the node either through a hardware or software switch Data Acquisition The process of collecting data from sensors and other devices Data Logging The process of saving acquired data to the system memory either locally on the node or remotely on the host computer DHCP network Dynamic Host Configuration Protocol is the standardized networking protocol used on Internet Protocol IP networks that automatically configures devices that are attached to it by assigning and configuring the device IP address Differential signal is a method of transmitting electrical signals in which they are paired together as a differential pair and measured with reference to each other only This method makes the pair less susceptible to electrical noise EMI Electromagnetic Interference is inductive or radiated disturbance that can create signal degradation on electrical signals including loss of data Firmware The code that is programmed onto a microcontroller or similar device in an embedded system that includes device operation commands conditions memory allocation and many other tasks wa LORD MicroStrain 8500 0006 Version A 75 SENSING SYSTEMS
45. etween internal battery operation and an external power source The V Link9 LXRS wireless Sensor Node contains an WARNING internal rechargeable Lithium Polymer Li Po battery See Safety Information on page 72 for important precautions The electronics within the node are sensitive to static and NOTICE moisture Do not touch the internal circuitry or expose to liquids Verify the main power switch to the node is OFF and the power supply disconnected before opening wa LORD MicroStrain 8500 0006 Version A 39 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Powering the Node 1 Verify the node power switch is in the OFF position and no external power is applied 2 Remove the node cover screws with a 0 05 hex head wrench 3 Use a small flat head screwdriver to push the recessed switch fully to the desired position as indicated in Figure 28 Power Source Selection The figure shows the node configured for an external power source 4 Once the setting is selected fasten the node cover back in place Node power switch Power source selector switch EXTERNAL gt INTERNAL BATTERY Switch position Figure 28 Power Source Selection wa LORD MicroStrain 8500 0006 Version A 40 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Powering the Node 6 2 Using the Internal Node Battery The V Link LXRS Wireless Sensor Node contains an AWARNING internal rech
46. g Voltages over Three Volts 2 2 200200 ccc eccec ccc cec ccc cecceececcecceeseceeees 34 5 8 8 Measuring Small Currents 4 to 20MA Sensors a 35 5 9 Using the Excitation Output as a Switch 36 5 10 Thermocouples 0000 cece cece cece ce cee e e ese se se se sm sess ee eere ese se sese lees 36 5 11 Connecting Accelerometers 0 00000 0000 37 5 12 On board Temperature Sensor 0 0 0 0 a 37 5 13 Sensor Calibration gaga Br enaar oenar rnane 38 6 PoweringtheNode 0 00 000 00n eens 39 6 1 Selecting the Power Source 00 00 0000 0 ea cece cee cece cece cecceceececeesesceeeseeees 39 6 2 Using the Internal Node Battery 0 0 00000 00 cece cece cece ccc cece eee Ie esee lesse lesse ln 41 6 3 Charging the Node Battery coon cece ence eee cece eee eese n eeeeeeeeeeee 42 6 4 Connecting an External Power Supply 0000 000 cc en 43 7 Troubleshooting 0 00 0 00 00 0000 44 7 1 Troubleshooting Guide ce ec ec ce et qe ect e UE agli ets ere ee Seca Jaca pgka 44 7 2 Device Status Indicators oe ve acters cacy tes SR ae 48 7 3 Using the Node Tester Board 0 00000 0 0000 49 7 4 Updating Node Firmware 0 0 0 0000000 cece cece cece cece cece ceeeeeceeeeeceeeeeceeceeceeeeeeeees 57 wa LORD MicroStrain Document 8500 0
47. ibration Methods on page 13 wa LORD MicroStrain 8500 0006 Version A 22 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Connecting Sensors 5 3 Sensor Power When using the internal node battery to power the node total ACAUTION sensor current draw of over 50mA can cause permanent damage to the node and should be avoided Sensors can be powered by the node or with an external power supply The node sensor excitation voltage is 3VDC and can provide up to 50mA total on all channels If a higher voltage or more current is required for the sensor an appropriately sized external power supply can be used For example using the node battery for current intensive devices such as 4 to 20mA sensors will drain the battery quickly For these applications an external source is recommended for the sensor or the node See O to 3VDC Voltage Measurements on page 33 for an example of using an external source for the sensor and see Powering the Node on page 39 for node power information Drain on the battery can also be limited by selecting low resource sampling modes and low duty sampling rates which automatically switches the node excitation voltage off after sampling This feature can also be utilized to turn switches on and off to further control resource use See Using the Excitation Output as a Switch on page 36 for more information External battery holders and a ruggedized outdoor housing that accommodates two D
48. id scale 9 Select the Auto Balance button to tare the no load value of the tester board Samples signal signal bits Communication bits Units Units Strain 7 Stan wizard AID Value bits Click Strain Wizard to run the Strain Wizard Bits to Strain Slope Conversion Formula outputeslope bits offset eme pa Effective Range O to 4095 Strain Offset 0 Channel 1 balanced to 31108 The offset for this channel has been updated to 515 SSS Figure 34 Channel Settings F LORD MicroStrain 8500 0006 Version A 52 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Troubleshooting 10 Selectthe Strain Wizard 11 Select Full Bridge for the Bridge Type Next and then Use the Strain Measurement Wizard Next 12 Setthe following for the Node Tester Board a Number of Active Gauges 4 b Gauge Factor 2 c Gauge Resistance enter the node tester board ohm value d Shunt Resistance 499000 ohms CU EN Please enter the bridge configuration information When done hit the Calibrate button for the changes to take affect and please be patient Number of Active Gauges Gauge Factor 2 00 Gauge Resistance 1000 Shunt Resistance 499000 Simulated Strain 250 00 Slope Residual Offset Select the correct bridge values then click Calibrate Cancel Figure 35 Strain
49. ion on page 4 5 Launch theNode Commander software and establish communications with the gateway and node wa LORD MicroStrain 8500 0006 Version A 50 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Troubleshooting 6 Enter the node channel configuration menu by right clicking on the node heading in Node Commander and selecting the Configure option and Channels tab gt Communicate gt Configure Read Write EEPROM Calibration Coefficients gt Frequency Remove Node Figure 32 Node Configuration Menu 7 Select the check box for Channel 1 which is where the Node Tester Board is installed and then select Configure Channels Streaming Synchronized Sampling Low Duty Cyde Datalogging Power RF info Physical Units Conversion Input Label Data Output i Range H Units bits 70 mV 21 I a bits 270 mv 2 bits 2600 pV 2222 bits 2800 2222 bits Other bits Other bits Other Ha ag O Figure 33 Node Channel Configuration wa LORD MicroStrain 8500 0006 Version A 51 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Troubleshooting 8 Use the following settings for the node tester board a Conversion Coefficients Units uStrain b Coefficients Class Strain c Conversion Coefficients Units uStrain d PGA Settings Input Range 2 5mV e PGA Setting M
50. is being utilized better resolution can be achieved by increasing signal amplification and by zeroing the sensor baseline in the appropriate offset biasing range Wireless Samples signal signal bits Communication bits Units Figure 20 Differential Channel Signal Processing wa LORD MicroStrain 8500 0006 Version A 26 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Connecting Sensors 5 7 1 Differential Input Gain and Offset The gain and offset range are set when the sensor channel is configured The combination of the gain offset and sensor signal cannot exceed the 0 to 3VDC input of the analog to digital converter within the node Table 5 Differential Gain Value lists the gain settings available on the V Link LXRS9 differential input channels The scaled input range is the approximate signal range of a sensor that would work with that gain without considering the offset setting To determine the gain and offset for a specific sensor consider the following bullets and examples e Resolution Applying gain to the sensor signal can be used to maximize the measurement resolution The more of the range that is used the more digital counts are available to measure the signal which typically means higher resolution measurements Limitations to the gain adjustment are the O to 3V input range of the node and the sensors measurement capabilities e Offset The offset setting position
51. is made by Texas Instruments and is part number LM60 Specifications may be found on the manufacturer s website wa LORD MicroStrain 8500 0006 Version A 37 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Connecting Sensors 5 13 Sensor Calibration The input channels are configured with the Node Commander software for the type of sensor and measurement being made and can be displayed and recorded in volts bits or engineering units There are preset measurement types designated by the measurement units as well as a user defined field There are several methods accessible through the software for entering calibration values or for in circuit sensor calibration including the use of the internal precision shunt resistor The calibration is entered or performed for the particular node channel that the sensor is connected to and saved in the node memory for that channel The calibration values are then applied when the software converts the raw voltage output of the sensors into the units designated during channel configuration In order to achieve accurate readings many sensors require calibration Calibration accounts for the slight variations between sensor elements wiring system electronics and sensor mounting and environmental conditions The sensor calibration values can be entered through the Node Commander software and are saved in the node memory for the applicable node channel See Sensor Calibratio
52. l Basic Setup and Operation 4 Once configurations settings have been entered for the sensor or Node Tester board select OK to exit the Channel Configuration window 5 Back in the Node Configuration window select Apply to write the configuration and calibration values to the node memory ognopgopu Figure 11 Apply Node Settings F LORD MicroStrain 8500 0006 Version A 12 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Basic Setup and Operation 3 6 Sensor Calibration Methods Many sensors require calibration in order to provide accurate data measurement Calibration accounts for differences between individual sensors and systemic variables Methods for determining the calibration values depend on the type of sensor measurement and application The Node Commander software facilitates multiple calibration methods and are described below The calibration values are applied when the software converts the raw voltage output of the sensors into the units designated during channel configuration e Sensor manufacturer s calibration The slope and offset values or some derivation are provided with the sensor by the manufacturer to prove its accuracy and describe expected voltage output Depending on the units these values may be directly entered into the channel configuration menu or may require calculations first Sensor wiring tolerances in system electronics a
53. lt setting for this switch is for internal battery operation and charging AXCAUTION MT Wy eo Connecting an external power source when the node is set to F internal power could result in injury or permanent node damage See Connecting an External Power Supply on page 43 for details on how to adjust the switch setting e Ifthe node is set to use an external source and the charging power supply is plugged in it will power the node from the power supply and not charge the battery It will continue to use the internal battery e If the node is set to internal and an external powers supply other than the one used for charging is plugged in several things could happen If it is a power supply that is in the operating range of the charging circuit it may charge the battery If it is below the range of the charging circuit nothing will happen If the applied voltage is above the range of the charging circuit damage to the node will likely occur and personal injury may result e When under battery operation there is a limit to how much current the node can provide to sensors If the node is in an over current condition it will shut off until the cause is removed Using an external power source for the node or sensor can mitigate this issue wa LORD MicroStrain 8500 0006 Version A 73 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual References 12 References 12 1 Related Documents Many references are available o
54. ment being made b PGA Settings Input Range is the sensor signal range This setting determines what gain is applied to the sensor measurement and is only available for some sensor types c PGA Setting Auto Balance sets the position of the no load baseline measurement for the sensor signal Low is for positive output signals High is for negative output signals and Mid range is for and positive and negative going output signals Once the scale level is selected the Auto Balance procedure is used to sets the no load baseline of the sensor at the designated scale level This feature is only available for some sensor types d Slope and Offset are the calibration values for the sensor They can be entered manually or for some sensors calibrated using a calibration wizard See Sensor Calibration Methods on page 13 for more information about calibration options Base aL ph Input Wireless Samples Output signal Communication bits b PGA Settings a InputRange 22 5mv 569 v Hardware Offset 47 amp gt Strain wizard A D Value bits c Click Strain Wizard to run the Strain Wizard High 9 Midscale Low Calibrated Value Bits to Strain d Slope 1 Offset 0 Conversion Formula output slope bits offset Effective Range 0 to 4095 Strain Figure 10 Channel Setup F LORD MicroStrain 8500 0006 Version A 11 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manua
55. n Methods on page 13 for more information about basic calibration methods in the software and see Using the Node Tester Board on page 49 for an example using the Node Tester board wa LORD MicroStrain 8500 0006 Version A 38 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Powering the Node 6 Powering the Node Apply only the input voltage range specified for the node in the polarity indicated Failure to do so could result in personal injury and permanent damage to the node See Safety Information on page 72 for important safety considerations The node can be powered with the internal battery or an external source These sources cannot be used simultaneously One or the other is selected with a switch that is located inside of the node enclosure When the node is manufactured the switch is set to operate using the internal battery External battery holders and a ruggedized outdoor housing that accommodates two D cell batteries are available for the V Link LXRS and can be used to extend battery operating capacity and duration See Node Accessories on page 63 for more information 6 1 Selecting the Power Source The V Link LXRS can be powered by either the internal battery or an external source There is user accessible switch inside of the node to select the source When the node is manufactured it is set to internal battery operation and charging The following steps describe how to change b
56. n the LORD MicroStrain website including product user manuals technical notes and quick start guides These documents are continuously updated and new applications added and may provide more accurate information than printed or file copies Listed below are a few that are pertinent to the V Link LXRS Document Where to find it Product Datasheets http www microstrain com wireless sensors Product Manuals and Technical Notes http www microstrain com support docs Product Application Notes http www microstrain com applications NIST Calibration Procedures http www nist gov calibrations i r ASTM Testing Procedures http Awww astm org Standard standards and publications html Table 12 Related Documents wa LORD MicroStrain 8500 0006 Version A 74 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual References 12 2 Glossary These terms are in common use throughout the manual ASTM Association of Standards and Testing nationally accepted organization for testing and calibration of technological devices Base Station The base station is the transceiver that attaches to the host computer and provides communication between the software and the node s also referred to as a gateway Bits The digital equivalent of voltage on the node Calibration To standardize a measurement by determining the deviation standard and applying a correction or calibration factor Configuration A gen
57. nd differences in mounting techniques are examples of systemic variables that can influence the sensor readings Sensors that are making small measurements or are otherwise sensitive to these slight differences may benefit from a system calibration The following techniques are system calibrations e System shunt calibration internal and external This option is only available for Wheatstone bridge type sensors such as strain gauges and utilizes a calibration wizard in Node Commander In the shunt calibration process an internal or external precision resistor is used to load part of the sensor bridge while the sensor remains unloaded The bridge output is measured and used as a loaded calibration point for the sensor In addition to the zero load value it can be used to derive the calibration slope and offset The internal shunt resistor is suitable for most applications however an external shunt may be beneficial in high gain scenarios For more information on the Wheatstone bridge configurations and sensor gain settings see Differential Sensors on page 29 For a demonstration of the Strain Wizard calibration process see Using the Node Tester Board on page 49 e System field calibration An alternate to the shunt calibration is to apply a known load to the sensor and measure the output With two or more data points the known value can be plotted against the measured output and used to determine the calibration slope and offset In Node Comm
58. nfigured at the time of manufacture with optional Wheatstone Bridge configurations and impedance values and must be connected accordingly See Parts and Configurations on page 62 for options The differential channels provide an input for sensors with a separate analog return The measurements are taken with respect to the analog return instead of the system ground in order to provide better protection for small measurements from EMI RFI and other sources of signal noise The V Link LXRS has four differential input channels The primary use of these channels is for strain gauges pressure transducers load cells and other devices that can utilize a Wheatstone Bridge configuration The V Link LXRS is available in standard configurations for either full half or quarter Wheatstone Bridge operation at various impedances See Differential Sensors on page 29 Custom configurations are also available See Parts and Configurations on page 62 for configuration and ordering options The differential measurement channels provide a 3VDC excitation voltage to the sensor and measures the resulting sensor signal output The sensor signal goes through a programmable gain amplifier PGA and is then processed in the node by a 16 bit analog to digital A D converter over the 3VDC range The resolution of the sensor measurement is dependent on the operating range of the sensor If the application is such that only a small portion of the 3VDC range
59. ng the Node 6 4 Connecting an External Power Supply Apply only the input voltage range specified for the node in the polarity indicated Failure to do so could result in personal injury and permanent damage to the node See Safety Information on page 72 for important safety considerations When the internal node switch is set for external power the node may be directly powered by the power supply specified for charging the node or another regulated AC to DC power supply with the appropriate output parameters It can also be powered by an external battery or other regulated DC supply The supply must deliver a stable voltage between 3 2V and 9 0VDC and be capable of sourcing at least 50mA Power supplies over 9VDC such as vehicle batteries can be used by installing a step down regulator See Power Profile on page 70 for V Link LXRS power use specifications External battery holders and a ruggedized outdoor housing that accommodates two D cell batteries are available for the V Link9 LXRS See Node Accessories on page 63 External power is applied through either the power supply jack or the terminal block connectors Do not connect both Observe connection polarities or the node may be damaged terminal block number signal power jack power jack pin Signal Figure 30 External Power Connections wa LORD MicroStrain 8500 0006 Version A 43 SENSING SYSTEMS V Link LXRS Wireless Sensor Node Us
60. og to digital A D converter over the 3VDC range The resolution of the sensor measurement is dependent on the full scale output range of the sensor The closer it is to three volts the more resolution will be achieved The following sections provide examples of how various sensors can be connected to the node For other applications or those outside of the operating parameters listed above contact Technical Support see Technical Support on page 60 for contact information Samples bits Wireless Communication Input Signal 0 3V Figure 24 Single Ended Signal Processing wa LORD MicroStrain 8500 0006 Version A 32 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Connecting Sensors 5 8 1 Oto 3VDC Voltage Measurements Sensors that operate in the O to 3VDC range are ideal for the node inputs Resistive loads that are not differentially measured such as string potentiometers are easily measured by the node single ended channels Power is provided by the node excitation voltage and measured on a single ended input as shown below Reference power supply signals between 0 and 3VDC can be measured by connecting directly between the signal input pin Ainx and ground GND Sensors that have voltage requirements outside of the range of the node excitation voltage can be powered externally with another source The sensor output can still be connected directly to the node input as
61. on 1 1 node power switch is off 1 POWER The status indicator LED will be off Toggle the switch upward to turn the node ON and the status indicator LED should illuminate noge docs poriumion 1 2 internal source select switch is set incorrectly or does not charge When the node is manufactured it is set to internal battery operation To change to an external source see Connecting an External Power Supply on page 43 1 3 wrong power supply Using a power supply other than the one specified for charging or an external supply that is outside of the node operating parameters could result in permanent damage to the node or it may just not work See Node Accessories on page 63 1 4 node battery is dead If the node power source is set to internal and the node will not power on attempt to charge the node battery See Charging the Node Battery on page 42 If the battery needs to replaced contact Technical Support See Technical Support on page 60 1 5 battery fault If the battery charge indicator is only on dimly when charging is attempted a battery fault condition has occurred Unplug power and then plug it back in The indicator should turn on brightly indicating charging See Charging the Node Battery on page 42 1 6 external power is OFF or miswired If the node power source is set to external and the node will not power on verify the power is wired correctly and turned ON See Connecting an External Power Supply on page
62. on Com 3 a Sample Communicate Configure Remove Node Figure 12 Node Sampling Menu wa LORD MicroStrain 8500 0006 Version A 14 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Basic Setup and Operation 2 Inthe Synchronized Sampling window select the destination folder for the data in the Save Location field as shown in Figure 13 Node Sampling Settings 3 Select Apply Network Configuration and then select Start Sampling T Save Location C ProgramData MicoStrain NodeCommander Data Nodes 1 Type Active Channels Sampie Rate Yeof Bandwidth Status Node 372 Vink ORS 1 512Hz 25 024 Ready to Start a suse Figure 13 Node Sampling Settings 4 Close the Settings window with the window X in the upper right to view the Sampling window behind it This is the Data Grid view Use the symbol next to the node heading to view the data statistics Base Station Com 3 Mentoring RS Node372 Syne rennet Base RSSI sar Figure 14 Sampling Data Grid View F LORD MicroStrain 8500 0006 Version A 15 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Basic Setup and Operation 5 Select Graph from the View Mode field and then click on the Node header to view a graphical representation of the data 6 To end sampling close the Sampled Data window with the red and white X on the window tab and select Exit S
63. ons 9 5 Warranty Information Warranty LORD MicroStrain warrants its products to be free from defective material and workmanship for a period ofone 1 yearfrom the original date of purchase LORD MicroStrain agrees to repair or replace at its sole discretion a defective product if returned to LORD MicroStrain within the warranty period and accompanied by proof of purchase This warranty does not extend to any LORD MicroStrain products which have been subject to misuse alteration neglect accident incorrect wiring mis programming or to use in violation of operating instructions furnished by us nor extend to any units altered or repaired for warranty defect by anyone other than LORD MicroStrain This warranty does not cover any incidental or consequential damages and is in lieu of all other warranties expressed or implied and no representative or person is authorized to assume for us any other liability in connection with the sale of our products Some states do not allow limitations on how long an implied warranty lasts and or the exclusion or limitation of incidental or consequential damages so the above limitations and exclusions may not apply to the original customer Terms and Conditions of Sale Please refer to the LORD MicroStrain s website Support page the complete Terms and Conditions of product sales Terms and Conditions of Service Please refer to the LORD MicroStrain s website Support page the complete
64. r 10 3 6 Sensor Calibration Methods 2 2 0 0 cece a 13 3 7 Data Acquisition 0 00 0 0000 0 14 3 8 Viewing Sensor Data 0 0 0 00 0000 0 0 17 4 Nodelnstallatin 3 0 18 4 1 Mounting Recommendations 0 000 00 00 0000 err 18 4 2 Optimizing the Radio Link 2 2 2 ccc 3xx400u a 0g kaa LA A MA LA ALS LL ele 19 42 1 Range Test 20 5 Connecting Sensors 000 0 aaa 21 5 1 Sensor Requirements 0000 0000 21 5 2 Wiring Recommendations 00 cece cece cece cece cece Ies hse s sse se se se sese le 22 AA 23 5 4 Node Channels Designations 0 2 cece cee en 23 5 5 Terminal Block Connections 02 0n 0 24 wa LORD MicroStrain Document 8500 0006 Version A SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual 5 6 Pin DESCripllOnS 2 NR RS RN 25 5 7 Differential Input Channels 0 0 eee eee eee cece cee ese esse e sess lesse leis 26 5 7 1 Differential Input Gain and Offset 0 0 2 0 0 20 20020 eee cee cecec ce ceccececcececcececceceeeece 27 5 7 2 Differential Sensors o eee Se a daag a 29 5 7 3 Measuring Small Voltages A AA 31 5 8 Single Ended Input Channels 0 00 cece eee cece cee ec cececceceececeececcececseceees 32 5 8 1 Oto 3VDC Voltage Measurements 0 33 5 8 2 Measurin
65. r use with the V Link LXRS For help with other sensor applications contact Technical Support see Technical Support on page 60 LORD MicroStrain Part Number ACCEL TRIAX 50 Triaxial Accelerometer 50g 6402 0310 Description ACCEL TRIAX 100 Triaxial Accelerometer 100g 6402 0110 ACCEL TRIAX 200 Triaxial Accelerometer 200g 6402 0210 ACCEL TRIAX 500 Triaxial Accelerometer 500g 6402 0410 Table 9 LORD MicroStrain Sensors wa LORD MicroStrain 8500 0006 Version A 63 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Parts and Configurations 9 4 Wireless System Equipment Description LORD MicroStrain i Part Number WSDA 1000 SK Wireless Sensor Data Aggregator Starter Kit Includes Ethernet gateway Ethernet communication 6314 0051 cable Node Commander software and power supply WSDA BASE 104 SK USB Gateway Starter kit Includes USB base station USB cable Node Commander software 6307 1041 and node charger WSDA BASE 102 SK RS232 Gateway Starter Kit Includes RS232 base station RS232 cable USB cable Node Com 6307 1021 mander software and node charger WSDA BASE 101 SK Analog Gateway Starter Kit Includes analog base station USB cable Node Commander soft 6307 1011 ware and node charger Table 10 Wireless System Equipment wa LORD MicroStrain 8500 0006 Version A 64 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Parts and Configurati
66. rd for strain gauges The following diagrams show how to connect these types of sensors See Sensor Calibration Methods on page 13 for more information KEY x channel number Rx sensor element or resistor Sx node terminal block connection variable output internal node circuit four element sensor circuit Full Bridge Figure 21 Full Bridge Wiring wa LORD MicroStrain 8500 0006 Version A 29 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Connecting Sensors KEY x channel number Rx sensor element or resistor Sx node terminal block connection variable output internal node circuit dual element sensor circuit Half Bridge internal node circuit single element sensor circuit recommended R4 Three Wire Quarter Bridge single element internal node circuit sensor circuit alternate R4 Two Wire Quarter Bridge Figure 22 Half and Quarter Bridge Wiring F LORD MicroStrain SENSING SYSTEMS 8500 0006 Version A 30 V Link LXRS Wireless Sensor Node User Manual Connecting Sensors 5 7 3 Measuring Small Voltages Some sensor types that have small signal voltages around 20mV or less may be better measured by biasing the sensor signal to the mid range of the node input range with a voltage divider as shown in Figure 23 Small Voltage Measurement Channel configuration will include adjusting the gain setting accordingly in the Node Commander
67. rdering options and questions Sales Support sensing sales LORD com Phone 802 862 6629 Toll Free 800 449 3878 Fax 802 863 4093 9 00AM to 5 00PM Eastern Time US 8 Canada wa LORD MicroStrain 8500 0006 Version A 66 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Specifications 10 Specifications 10 1 Physical Specifications 79 mm 3 12 in 96 mm 3 79 in 74 mm 20 mm 2 90 in 78 in 54 mm 2 12 in ha tt L Dimensions 79mmx96mmx20mm Weight 141grams Enclosure Environmental Rating General purpose indoor IP67 NEMA4X rated enclosure available wa LORD MicroStrain 8500 0006 Version A 67 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Specifications 10 2 Operating Specifications Parameter Specification 7 input channels 4 full differential 350 Q resistance or higher with optional bridge Input channels completion and 3 single ended inputs 0 3 volts maximum plus an internal temperature sensor Temperature sensor 40 C to 70 C range typical accuracy 2 C at 25 C Anti aliasing filter bandwidth 3 dB cutoff at 250 Hz factory adjustable Measurement accuracy 0 1 full scale typical 1 bit 0 024 1 microstrain typical for 3 wire full bridge strain gauge when used in accordance with LORD MicroStrain recommendations gt ee 3VDC 50mA maximum across all channels pulsed to sensors for sample rates of DC
68. red for the sensor that is connected to it Below are the steps required to enter the channel configuration menus and provides an overview of menus and configuration options For an example configuration using the Node Tester board See Using the Node Tester Board on page 49 1 Right click on the Node heading and select Configure Configure Node amp Base Station Com 3 H S Node372 Sample gt Communicate gt Configure gt Read Write EEPROM Calibration Coefficients gt Frequency gt Remove Node Figure 8 Node Configuration 2 Select the check box to enable the channel the sensor or test board is connected to and then select Configure Channels Streaming Synchronized Sampling Low Duty Cyde Datalogging Power RF info Channel Physical Units Conversion Input Label Enabled Data Output Units Range vi DG AJD Value bits 70 mv 21 AJD Value bits x70 mV 21 AD Value bits 2600 uv 2222 AJD Value 2600 pV 2222 A D Value Other 1a E1 AJD Value i Other A D Value Other A D Value Other Figure 9 Node Channels Menu wa LORD MicroStrain 8500 0006 Version A 10 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Basic Setup and Operation 3 Select the desired channel configuration options Below is a description of some of the primary settings a Conversion Coefficients defines the type and units of the measure
69. s cautionary measures 11 1 Battery Hazards WARNING A CAUTION HITI The V Link LXRS Wireless Sensor Node contains an internal rechargeable Lithium Polymer Li Po battery Li amp Po batteries are a fire and explosion hazard Do not store or operate the node at temperatures above 212 F 100 C Do not disassemble short circuit crush puncture or otherwise misuse the battery HES When recharging the node internal battery use only the power supply specified for node charging and follow the instructions See Charging the Node Battery on page 42 A Applying a voltage above the input range may result in dangerous battery conditions or cause permanent damage to the node HES Li Po batteries contain toxic chemicals that are harmful to humans and the environment Disposal is subject to federal and local laws Do not discard the battery or the node in the trash Follow proper battery disposal protocol or contact LORD MicroStrain Technical Support for information on extracting the battery or returning the product for proper recycling and disposal wa LORD MicroStrain 8500 0006 Version A 72 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Safety Information 11 2 User Configurable Power Settings The V Link LXRS Wireless Sensor Node can be powered by either the internal battery or an external source There is user accessible switch inside of the node to select the source The defau
70. s the zero load value of the connected sensor within the 0 to 3V range of the node input A mid range setting positions the baseline offset in the middle of the 0 to 3V range 1 5V and is used for sensors with negative and positive going signals The low range setting positions the baseline offset in the bottom quarter of the O to 3V range 75mV and is used for sensors with mostly positive going signals The high range setting positions the baseline offset in the top 3 4 of the range and is used for mostly negative going signals Gain Scaled input range 3799 Table 5 Differential Gain Value 39 www o wa LORD MicroStrain 8500 0006 Version A 27 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Connecting Sensors EXAMPLE 1 Sensor signal range O to 50mV Gain setting 21 Baseline offset range setting Mid range Calculations 50mV 21 1 05V maximum voltage of sensor signal with gain 1 05V 1 5V 2 55V maximum input voltage to node with gain and offset Calculated node input over sensor range 1 5 to 2 55V This is a good setting because the node input voltage is within the 0 to 3V range EXAMPLE 2 Sensor signal range 0 to 50mV Gain setting 30 Baseline offset range setting Low range Calculations 50mV 30 1 5V maximum voltage of sensor signal with gain 1 5V 75mV 2 25V maximum input voltage to node with gain and offset Calculated node input over sensor range 75mV
71. t angle 14 wave rubber whip antenna with a with an omni directional radiation pattern The antenna has a joint in the middle that allows it to be rotated and aimed Using any other antenna than what is included with the node will void FCC compliance The best method for ensuring optimal radio communication is to conduct an RF survey of the installation site This is easily accomplished in Node Commander by using the range test feature to quantify the radio signal strength RSSI in various scenarios The following bullets are general guidelines for maximizing transmission range See Range Test on page 20 for instructions on using Node Commander for measuring RSSI e Establish Line of Sight LOS between the node and gateway antennas as best as possible Minimize the obstructions between them such as buildings terrain vegetation in all seasons or other physical barriers Increase the mounting height of the node or antenna if it allows a clearer LOS path to the gateway e Minimize Radio Frequency Interference RFI such as other equipment antennas especially those operating in the same frequency range This includes other nodes If other antennas are required nearby mount them at different heights to minimize interference Additionally the specific node frequency is selectable within its operational range using the Node Commander software Set the devices to different transmission frequencies e Minimize Electromagnetic Interference E
72. top Nodes to stop sampling Avakakie Nodes YAn Zoom IX Ka Vaso Hevea Width 10 Click on the Node Figure 15 Sampling Data Graph View F LORD MicroStrain 8500 0006 Version A 16 SENSING SYSTEMS Basic Setup and Operation V Link LXRS Wireless Sensor Node User Manual 3 8 Viewing Sensor Data Data is stored in CSV format and can be viewed with Microsoft Excel Quattro Pro Open Office and other CSV editors and spreadsheet programs The files can be found in the location specified at the beginning of sampling through the Node Commander File menu Different sampling modes will output different file types Synchronized sampling will produce four files the Master data file the Node file Sensor settings file and the sensor Networks file i Explore Data Directory i Upload Data to SensorCloud Exit GD Node 372 J MicroStrain gt NodeCommander Data Sampled Data gt session 09 30 2013 T19 46 08 Search session C File Edit View Tools Help Organize v R Open v Print Burn New folder Jr Favorites Name S Date modified Type Size BE Desktop Ex Master 09 30 2013 T19 46 08 csv 9 30 20133 46 PM Microsoft Office E 237 KB Jg Downloads ES Node372 csv 9 30 2013 3 46PM Microsoft Office E 238 KB Recent Places Ei Sensorlnfo_09 30 2013 T19 46 08 csv 9 30 2013 3 46PM Microsoft Office E 1 KB Gi SyncNetworkinfo 09 30 2013 T19 46 08 9 30 20013346 PM Microsoft Offi
73. und on the LORD MicroStrain website Refer to the following Technical Support section for the web address 1 Download the LXRS Firmware Upgrade file from the LORD MicroStrain9 website 2 Once downloaded extract the contents of the zip file into a folder on the computer Verify there is a file with a zhex extension 3 Launch Node Commander and establish communication between the node and gateway as normal 4 Press and hold F1 on the computer keyboard While holding F1 right click the node heading and a drop down menu will appear amp Base Station Com 36 Ea 9 Noda 412 Upgrade Firmware Figure 40 Update Node Firmware F LORD MicroStrain 8500 0006 Version A 57 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Troubleshooting 5 Release the F1 key 6 Click Upgrade Firmware and the Node Firmware Upgrade window will appear 7 Click Browse and navigate to the downloaded zhex file 8 Click Write and the upgrade sequence will begin When complete an Upgrade Success message will appear in the Status column Bootloader Version FW Before Upgrade FW After Upgrade Status 1 06 8 00 8 05 Firmware found Ready Path C VUserslb trutor Desktop lmirostrain wireless frmware V2 1 0 2hex Figure 41 Upgrade Firmware Window F LORD MicroStrain 8500 0006 Version A 58 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Troubleshooting 7
74. uter with the Node Commander and SensorCloud software platforms Integration to customer systems can be accomplished using OEM versions of the sensor nodes and by leveraging the LORD MicroStrain data communications protocol Common applications of the LORD MicroStrain Wireless Sensor Networks are wireless strain sensor measurement wireless accelerometer platforms wireless vibration monitoring wireless energy monitoring wireless environmental monitoring and wireless temperature monitoring ta Figure 1 Wireless Sensor Network Overview wa LORD MicroStrain 8500 0006 Version A 1 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Node Overview 2 Node Overview The V Link LXRS wireless sensor node features seven analog input channels designed to accommodate a wide range of Wheatstone bridge and analog sensors including strain load cell torque pressure acceleration vibration magnetic field displacement geophones and more There are three channels for single ended sensor measurement four channels for differential sensor measurement and an on board internal temperature sensor V Link LXRS inputs are 16 bit resolution with 0 1 full scale measurement accuracy The node can log data to internal memory transmit real time synchronized data and supports event driven triggers with both pre and post event buffers To acquire sensor data the V Link LXRS is used with any
75. ve and idle approximate Continuously ON gab i logging or streaming data Pulses at sample rate Node is sampling in low duty cycle Device Status Node is sending out Pulses for each ping A Indicator communication requests Pulses at very high speed Node is being range tested Node EEPROM is being Several rapid pulses read or written Faint pulse at intervals Nage ie Seep nig wih ragig check intervals Pour SOW pulses dba Fault condition power is initially applied As SON pulsas when Fault condition power is initially applied Table 6 Device Status Indicators wa LORD MicroStrain 8500 0006 Version A 48 SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Troubleshooting 7 3 Using the Node Tester Board The node tester board is used to verify node and network functions before sensors are connected or for diagnostic purposes The node tester board is used only on differential input channels and provides a fixed load so system functions can be verified including basic operations not related to the sensor such as communication and sampling There are various impedance value node tester boards available depending on the node it is being used with See Parts and Configurations on page 62 for configuration options and part numbers Table 7 Tester Board Configuration describes the strain gauge load settings available This setting must match the type of node channel that is being tested For example if the
76. wering the Node on page 39 for details Sensor excitation Power to external sensors At sampling rates under 32Hz it is only active when the node is sampling the sensors Differential sensor input Positive input to the node programmable gain amplifier PGA Used with Sx Differential sensor input Negative input to the node programmable gain amplifier PGA Used with Sx Input for three wire configuration of quarter bridge strain gauge bridges Leave unconnected for non quarter strain gauge bridge applications Single ended sensor input Routed directly to the node analog to digital A D converter Return is node GND x denotes the channel number Pin Type power input 3 6 to 9VDC sufficient current capacity for all sensors connected a ower Node power and sensor excitation return a return 3VDC maximum combined load on all excitation pins is 50mA input 0 to 3VDC including gain and offset settings Wheatstone Bridge compatible sensor with 3502 or 10000 input impedance recommended O to 3VDC including gain and offset settings Wheatstone compatible sensor with 3502 or 10000 input impedance recommended Bridge 0to 3VDC Less than 5KQ Table 4 Node Pin Descriptions 8500 0006 Version A 25 Za LORD MicroStrain SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Connecting Sensors 5 7 Differential Input Channels Differential channels are co
77. y the sensor is configured on the correct channel and has been enabled for data acquisition 3 3 sensor calibration is invalid If possible perform a field verification of the sensors by applying know loads and comparing the measured values In the channel configuration settings verify the sensor channel units are selected correctly Verify the calibration calculations are correct Verify the gain and offset range is correct and that the baseline offset is set with Auto Balance as applicable Verify the calibration values the slope and offset are correct Verify all parameters were written to the node channel Recalibrate as needed 3 4 sensor sampling set up incorrectly Verify sampling is active Verify the sampling parameters are correct including the sampling rate and mode Verify the data location is where expected Za LORD MicroStrain m SENSING SYSTEMS V Link LXRS Wireless Sensor Node User Manual Troubleshooting 7 2 Device Status Indicators The following is a complete summary of the V Link LXRS status indicators Indicator Behavior Node Status Node battery is not OFF currently being charged Battery Charge ON bright red Node battery is charging Status Indicator Battery fault condition ON dim red reset by unplugging power and then plugging it back in Battery is fully charged Node is OFF Ten rapid flashes when i dede Node is booting up normally power is initially applied 1 second pulse Node is acti

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