Campbell AVW200 series User Manual Download

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AVW200-series 2-Channel

Vibrating Wire Spectrum

Analyzer Modules

Revision: 2/12

C o p y r i g h t © 2 0 0 8 - 2 0 1 2

C a m p b e l l S c i e n t i f i c , I n c .

Summary of Contents for AVW200 series

Page 1: ...AVW200 series 2 Channel Vibrating Wire Spectrum Analyzer Modules Revision 2 12 C o p y r i g h t 2 0 0 8 2 0 1 2 C a m p b e l l S c i e n t i f i c I n c...

Page 2: ......

Page 3: ...emoving reinstalling and shipping defective products to Campbell Campbell will return such products by surface carrier prepaid within the continental United States of America To all other locations Ca...

Page 4: ...g container Campbell Scientific s shipping address is CAMPBELL SCIENTIFIC INC RMA _____ 815 West 1800 North Logan Utah 84321 1784 For all returns the customer must fill out a Statement of Product Clea...

Page 5: ...ments 7 2 1 Vibrating Wire 7 2 2 Temperature 10 3 Quick Start Guides 11 3 1 One or Two Sensors no multiplexers 11 3 1 1 Direct RS 232 Connection 11 3 1 2 Wireless Connection 12 3 2 Multiplexers Contro...

Page 6: ...200 Instruction Running in the Pipeline Mode 48 7 4 AVW200 Instruction Running in the Sequential Mode 49 7 4 1 AVW200 Controlling Two Multiplexers in Sequential Mode 50 7 4 2 Datalogger Controlling Tw...

Page 7: ...p Modems with AVW200 Interfaces I 1 I 1 Required Settings 1 I 2 Connections 2 I 2 1 Datalogger to MD485 3 I 2 2 MD485 to MD485 3 I 2 3 MD485 to AVW200 4 I 2 4 Multiplexer Connections 4 I 3 Programming...

Page 8: ...le for Yagi or Omni Colinear C 5 C 1 3 Antenna Surge Protector C 5 F 1 1 Good Sensor with a Narrower Range 200 to 2200 Hz F 2 F 1 2 Good Sensor with a Wider Range 200 to 6500 Hz F 2 F 2 1 Good Sensor...

Page 9: ...ese sensors are used in a wide variety of structural hydrological and geotechnical applications because of their stability accuracy and durability Up to two vibrating wire or vibrating strip transduce...

Page 10: ...s per measurement The first value is the vibrating wire frequency in Hz The sixth value is the optional thermistor measurement on Ohms Values two through five are diagnostic information giving an indi...

Page 11: ...re Spectrum Analyzer Modules 1 2 Specifications 1 3 Communication 1 3 1 Datalogger The AVW200 module is designed to work with and complement Campbell Scientific dataloggers as well as data acquisition...

Page 12: ...or sequential mode This instruction is contained in the following datalogger operating systems CR800std 06 or greater CR1000std 15 or greater CR3000std 08 or greater Multiplexers can be controlled by...

Page 13: ...ulator of DevConfig or LoggerNet HyperTerminal or ProComm can also be used The AVW200 needs to be connected to a computer with a standard RS 232 cable CSI model 10873 Read more Terminal Mode Commands...

Page 14: ...work of AVW206s and AM16 32Bs wireless COM1 C1 C2 CR1000 COM3 C5 C6 COM4 C7 C8 COM2 C3 C4 CR3000 CR800 CR850 128 Vibrating Wire Sensors in 4x16 configuration 256 Vibrating Wire Sensors in 2x32 configu...

Page 15: ...00 In addition the spectral analysis gives improved frequency resolution 0 001 Hz rms during quiet conditions The AVW200 measures the resonant frequency of the taut wire in a vibrating wire sensor see...

Page 16: ...2 Volts peak to peak Therm50_60Hz see Section 2 2 Unitless Thermistor measurement parameter 0 No thermistor measurement _60Hz Use 60 Hz noise rejection _50Hz Use 50 Hz noise rejection The measurement...

Page 17: ...essimistic threshold than 0 01 mV this can be done by using an optional parameter in the AVW200 CRBasic Instruction See Section 6 1 for details about how this can be done The Resonant Frequency readin...

Page 18: ...n 5 5 and Appendix F and detailed programming information in Section 6 2 2 Temperature The AVW200 contains a completion resistor for measuring the internal thermistor contained in many vibrating wire...

Page 19: ...The sensor s are attached directly to the AVW200 The AVW200 is connected directly with the datalogger via the 17855 cable or 18663 cable The 17855 cable terminates in pigtails for connection to datal...

Page 20: ...gin Frequency 1000 End frequency 3500 Excitation voltage 12 V peak to peak option 2 Read more A thorough description of the AVW200 instruction and its parameters is provided in Section 6 1 A complete...

Page 21: ...alogger s CS I O port to the RF401 s CS I O port The datalogger s CS I O port applies power to the RF401 Read more More information about using spread spectrum radios is provided in the RF401 RF411 RF...

Page 22: ...1 The default multiplexer for the AVW200 is the AM16 32A 2 Attach the multiplexers to the AVW200 as shown in Figure 4 5 1 1 3 Connect the sensors to the multiplexers Read more Information about conne...

Page 23: ...it Begin Frequency 450 End frequency 3000 Excitation voltage 12 V peak to peak option 2 Read more A thorough description of the AVW200 instruction and its parameters is provided in Section 6 1 Comple...

Page 24: ...in Appendix C 6 Use the power cable to connect the 12V and G terminals on the AVW206 to the 12V and G terminals on the PS100 or another power supply At the datalogger RF401 site do the following step...

Page 25: ...rovided in Section 6 1 A complete example program that controls two multiplexers is included in Appendix H 1 2 3 3 Multiplexers Controlled by Datalogger 3 3 1 SDI 12 Communication Cable that Comes wit...

Page 26: ...ontrol port and ground on the datalogger 6 Connect one end of the 19246 power cable to the 12V and G terminals on the AVW200 and the other end to the 12V and G terminals on the datalogger or external...

Page 27: ...directly connected to the datalogger When a datalogger is in the same enclosure only connect the datalogger s ground lug to earth ground NOTE The AVW200 s ground lug is connected to earth ground via a...

Page 28: ...the cable is ordered as a common accessory TABLE 4 3 1 Datalogger to AVW200 Cable Options Datalogger Port for Cable Attachment Communication Protocol Cable Used CR800 CR850 CR1000 CR3000 CR5000 CR10X...

Page 29: ...C3 C5 or C7 White C2 or C4 C2 C4 C6 or C8 Yellow G G 4 4 Wireless Connections AVW206 AVW211 AVW216 The connector on the side of the AVW206 AVW211 and AVW216 is for attaching a whip antenna or an anten...

Page 30: ...e radio s Protocol must be set to PakBus Aware or PakBus Node Read more Description of our antenna options is provided in Appendix C More information about using spread spectrum radios is provided in...

Page 31: ...hen using SDI 12 the datalogger must control the multiplexer Use the CABLE4CBL L cable to connect the AVW200 to the multiplexer if the vibrating wire sensors contain a thermistor see Figure 4 5 2 1 Us...

Page 32: ...SDI 12 A CABLE4CBL L cable is used to connect the multiplexer to the datalogger see Figure 4 5 2 2 RES CLK GND 12V O N MUXPOWER SHIELD CR800 CR850 CR10X CR3000 CR1000 CR23X CR5000 G G CABLE FIGURE 4...

Page 33: ...ands To use DevConfig the AVW200 must be connected to a PC and a power source 1 The default settings for the AVW200 may be used for many applications NOTES 2 DevConfig has built in help for each setti...

Page 34: ...ch the AVW200 is connected 6 Press the Connect button The device may take up to 60 seconds to respond to DevConfig and for the current settings to be loaded into the Settings Editor 5 2 Deployment Tab...

Page 35: ...the Protocol setting for the RF401 series radio must be set to either PakBus Aware or PakBus Node for communications to be successful PakBus Address enter a PakBus Address that matches the PakBus addr...

Page 36: ...ng RF401 Power Modes AVW206 Power Mode Recommended RF401 Power Mode 24 ma Always On 24ma Always On No header 4 ma 1 2 Second 24ma Always On No header 2 ma 1 Second 24 ma Always On 1 Sec Header 0 4 ma...

Page 37: ...he Begin Frequency End Frequency and excitation parameters in DevConfig are only used for the RS 232 terminal commands and SDI 12 communication modes When using the RS 232 PakBus or RF PakBus communic...

Page 38: ...er s recommendation for the end frequency Excitation if using RS 232 terminal commands or SDI 12 choose either 5 Volts Peak Peak or 12 Volts Peak Peak excitation Use the sensor manufacturer s recommen...

Page 39: ...n of each The status table contains system operating status information accessible see Figure 5 3 2 Note DevConfig polls the status table at regular intervals and then updates the status information F...

Page 40: ...1 10 or greater First connect the RS 232 port of the AVW200 to a serial port on your computer using a 9 pin serial cable and follow the steps below 1 Remove power from the AVW200 2 Open DevConfig 3 H...

Page 41: ...Follow the connection procedure provided in Section 5 1 2 Click the Troubleshoot tab at the top of the DevConfig opening window Figure 5 5 1 FIGURE 5 5 1 Opening Page of the Troubleshoot Tool 3 Click...

Page 42: ...ultiplexer channel that the sensor is attached If not using a multiplexer then set the multiplexer channel to one 5 Once the appropriate settings have been specified click OK on the Options window and...

Page 43: ...r has been excited with the frequency swept voltage signal and the top graph shows the spectrum after the AVW200 has applied the FFT In addition to the wire s resonant frequency the spectrum shows the...

Page 44: ...he available terminal commands and the values returned for each command are listed in the Table 5 4 1 TABLE 5 4 1 Terminal Mode Commands Command Description Return Values 1 Make VW measurement on chan...

Page 45: ...instruction is used to read measurements from one or more vibrating wire sensors when the sensors are connected to the AVW200 channels directly or connected to a multiplexer that s attached to the AV...

Page 46: ...ed as SDC8 ComSDC10 RF401 connects to datalogger s CS I O port RF401 configured as SDC10 ComSDC11 RF401 connects to datalogger s CS I O port RF401 configured as SDC 11 Com1 AVW200 connects to datalogg...

Page 47: ...RBasic AVW200 instruction the signal strength Amplitude in mV rms Dest 2 has a minimum resolution of 0 0625 62 5 microvolts This means that values between 0 01 and 0 06249 mV 10 and 62 49 microvolts w...

Page 48: ...ues returned in Dest _60Hz Use 60 Hz noise rejection 6 values returned in Dest _50Hz Use 50 Hz noise rejection 6 values returned in Dest Multiplier The Multiplier parameter is the multiplier to be use...

Page 49: ...e Multiple AVW200 instructions can use the same Result variable There is no reason to have different Result variables for a given communication port in the pipeline mode In the Pipeline mode of operat...

Page 50: ...Measurements For our CR5000 CR10X and CR23X dataloggers an SDI 12 instruction must be used to trigger and retrieve measurements from the AVW200 Our CRBasic dataloggers e g CR5000 CR1000 CR3000 use the...

Page 51: ...1 SDI 12 Command Codes SDI12 Measurement Command Returned Values aM Measures both AVW200 Channel 1 and Channel 2 1 Chan1 Frequency 2 Chan1 Therm Resistance 3 Chan1 Signal Amplitude mV RMS 4 Chan2 Freq...

Page 52: ...mand will use the settings specified in the extended command The second and remaining measurements will revert back to the settings specified via DevConfig The SDI 12 aI command is used to obtain info...

Page 53: ...RS 232 CR1000 Series Datalogger This program measures 2 sensors on the AVW200 1 on channel 1 and 1 on channel 2 Public PTemp batt_volt Public Dst 2 6 Public result DataTable AVW200 1 1 stores data fr...

Page 54: ...icates with the remote AVW206 through an RF401 radio attached to the logger s CS IO port in SDC7 mode The Pakbus address of the AVW206 used in this example is 15 Public batt_volt Ptemp Public VWvalues...

Page 55: ...Model COM1 control port pairs C1 C2 17855 Cable pigtail to DB9 male cable RS 232 CR1000 Declare Variables and Units Public BattV Public PTemp_C Public Temp_C Public Data1 Data2 Public Mux1 16 6 Mux2...

Page 56: ...s example program a returned Result value the first parameter in the AVW200 instruction of zero indicates successful communication and tells us that the data values have been stored in the destination...

Page 57: ...e of operation In these example programs the first AVW200 instruction communicates with the attached AVW200 interface module using Com1 and PakBus address 200 and tells the AVW200 to make sixteen meas...

Page 58: ...Number of Reps Const BFreq 450 Begin Frequency Const EFreq 6000 End Frequency Const Xvolt 2 12p p Volt Excite BeginProg SerialOpen Com1 38400 0 0 10000 Scan 64 Sec 0 0 2 32 measurement 64 seconds Pane...

Page 59: ...12 Example The following program is an example of how to run the AVW200 with a CR1000 using the SDI12Recorder instruction Note that the values returned from the SDI12Recorder instruction are different...

Page 60: ...12 Command Codes SDI12 Measurement Command Returned Values aM Measures both AVW200 Chan1 Chan2 1 Chan1 Frequency 2 Chan1 Therm Resistance 3 Chan1 Signal Amplitude mV RMS 4 Chan2 Freq 5 Chan2 Therm Res...

Page 61: ...Temp 250 Battery Batt_volt PortSet 3 1 Reset High Mux On both mux s share this reset port Delay 1 100 mSec delay before clocking Measure 16 vibrating wire sensor on AVW200 channel 1 For I 1 To 16 Adva...

Page 62: ...different than the PakBus address of the datalogger 3 The AVW200 PakBus address is entered correctly in the AVW instruction of the datalogger program 8 3 Wireless Communications If you can t connect...

Page 63: ...cable 7 AVW206 receiver de sensing from nearby transmitter This problem can be observed from LED behavior when operating a hand held radio near an AVW206 that is receiving collected data from a remote...

Page 64: ...ending transmitter is located behind or to the side of the yagi to take advantage of yagi s front to back or front to side ratio back and side signal rejection c Change polarization element orientatio...

Page 65: ...n to convert the AVW200 s frequency values from Hertz to digits Digits Hz 1000 2 x 1000 2 Use the gage factors and polynomial provided in the Calibration Report to calculate displacement A 1 Displacem...

Page 66: ...Appendix A Conversion from Hertz FIGURE A 1 1 Geokon Calibration Report of a Sensor without a Thermistor A 2...

Page 67: ...btained from the sensor manufacturer Please see your manufacturer to get the coefficients for their thermistor NOTE B 1 1 Resistance Conversion Example Geokon Sensor If the coefficients for Steinhart...

Page 68: ...d its affect can be removed by the initial calibration Errors caused by the change in wire resistance due to temperature and thermistor interchangeability are not removed by the initial calibration Fi...

Page 69: ...formation FIGURE B 2 2 Temperature Measurement Error on a 1000 foot Lead Wire is 22 AWG with 16 ohms per 1000 feet FIGURE B 2 3 Temperature Measurement Error on a 3000 foot Lead Wire is 22 AWG with 16...

Page 70: ...Appendix B Thermistor Information FIGURE B 2 4 Temperature Measurement Error on a 5000 foot Lead Wire is 22 AWG with 16 ohms per 1000 feet B 4...

Page 71: ...z antennas are compatible with the AVW216 Pick one of the antennas listed below NOTE CSI Item Number Description 14310 0 dBd ANTENNA 900 MHz OMNI WAVE WHIP RPSMA STRAIGHT LINX 3 2 inches long 14204 0...

Page 72: ...e strength of the signal that is ultimately transmitted Except for cable locating equipment the standards in Part 15 are not based solely on output power but also take into account the antenna charact...

Page 73: ...Antennas Antenna Cables and Surge Protectors for the AVW206 AVW211 and AVW216 ITEM 14201 900 MHZ YAGI 9 dBd w MOUNTS ITEM 14205 900 MHz YAGI 6 dBd w MOUNTS ITEM 14221 900 MHZ OMNI COLLINEAR 3 dBd w M...

Page 74: ...ge Protectors for the AVW206 AVW211 and AVW216 ITEM 15970 900 MHZ Indoor OMNI 1 dBd Window Wall Mounted ITEM 16005 2 4 GHz OMNI HALF WAVE WHIP 0 dBd ITEM 16755 2 4 GHz ENCLOSED YAGI 13 dBd w MOUNTS FI...

Page 75: ...urge Protectors C 3 1 Electrostatic Issues Many installations are out of doors and therefore susceptible to lightning damage especially via the antenna system Also depending on climate and location el...

Page 76: ...fications to the AVW206 AVW211 or AVW216 not expressly approved by Campbell Scientific Inc could void the user s authority to operate this product Note This equipment has been tested and found to comp...

Page 77: ...d AVW216 This device complies with part 15 of the FCC Rules Operation is subject to the following two conditions 1 This device may not cause harmful interference and 2 This device must accept any inte...

Page 78: ...Appendix C Antennas Antenna Cables and Surge Protectors for the AVW206 AVW211 and AVW216 C 8...

Page 79: ...an1 and MuxChan1 205 AVW200 Chan1 and MuxChan5 or 208 AVW200 Chan2 and MuxChan8 The measurement is completed when the TimeSeries 1 value is zeroed by the AVW200 Once zeroed the TimeSeries 5 through Ti...

Page 80: ...f used unchanged if not using SDI 12 SDIChan Channel used for SDI 12 measurement SDIBFreq Begin frequency used for SDI 12 measurement SDIEFreq End frequency used for SDI 12 measurement SDIExVolt Excit...

Page 81: ...n2 and Mux chan32 Notes TimeSeries 2 4 need to be filled with valid values before making the measurement TimeSeries 2 Begin Frequency for force measurement 100 6500 TimeSeries 3 Eng Frequency for forc...

Page 82: ...tio TimeSeries 11 Thermistor measurement Ohms SerialOpen Com1 38400 0 0 0 Scan 5 Sec 0 0 If UsrForcedMsmnt True Then Set remote measurement parameters SendVariables SVResult 1 Com1 200 200 0000 100 Pu...

Page 83: ...lds and Descriptions Status Fieldname Description User can change Record No Record number for this set of data No Time Stamp Time the record was generated No OSversion Version of the Operating System...

Page 84: ...om seconds duty cycle to 1 seconds duty cycle mode edit the parameter with RF_1_Sec PortStatus 1 Indicates control port 1 level 0 off low zero volts 1 on high five volts No PortStatus 2 Indicates cont...

Page 85: ...nt Number of Watchdog errors that have occurred while running this program Yes clear to zero ResetTables Not Used Yes function disabled BattVoltage Current value of the AVW200 battery voltage value up...

Page 86: ...Appendix E Status Table E 4...

Page 87: ...ginning amplitude Some sensors will decay very rapidly others not It is a good idea to characterize the sensors decay and amplitude when the sensor is new so that over time the health of the sensor ca...

Page 88: ...Appendix F Time Series and Spectrum Graph Information FIGURE F 1 1 Good Sensor with a Narrower Range 200 to 2200 Hz FIGURE F 1 2 Good Sensor with a Wider Range 200 to 6500 Hz F 2...

Page 89: ...f the noise source and has yielded a signal to noise ratio of 4 times better than F 2 2 Notice that if the begin frequency in Figure F 2 2 was much less than 450 Hz the 60 Hz harmonic would have been...

Page 90: ...trum Graph Information FIGURE F 2 2 Good Sensor with Noise 450 to 6500 Hz Check the manufactures specification for the sensors frequency and excitation range before picking the begin end frequencies a...

Page 91: ...ay W Ex 0 01 sec units 3 10 Delay After Ex 0 01 sec units 4 0000 mV Excitation 5 SDI 12 Recorder P105 1 0 SDI 12 Address 2 1 Start Measurement aM1 3 1 Port 4 91 Loc VW 5 1 0 Multiplier 6 0 0 Offset 6...

Page 92: ...96 1 96 X Loc Thrmister 2 81 Z Loc Therm_1 12 Z X F P37 1 76 X Loc Therm_1 2 001 F 3 76 Z Loc Therm_1 13 End P95 14 Do P86 1 52 Set Port 2 Low 15 Do P86 1 10 Set Output Flag High Flag 0 16 Real Time P...

Page 93: ...6 Public Mux2 16 6 Public VWResults 2 Public Amp1 16 Amp2 16 Public Temp1 16 Temp2 16 Public Therm1 16 Therm2 16 Public VWfreq1 16 VWfreq2 16 Public Sig2Noise1 16 Sig2Noise2 16 Public DecayRatio1 16...

Page 94: ...g1 12 2 27416e 10 8 797e 5 0 19552 CoefString1 13 2 27264e 10 8 798e 5 0 19522 CoefString1 14 2 87777e 10 8 682e 5 0 20353 CoefString1 15 2 81051e 10 8 767e 5 0 19691 CoefString1 16 2 41462e 10 8 747e...

Page 95: ...32 Calculate displacement inches from Digits and calibration polynomial Displacement1 i PolyCoef1 3 i 2 Digits 2 PolyCoef1 3 i 1 Digits PolyCoef2 3 i Next i AVW200 VWResults 2 ComRS232 0 15 Mux2 1 1...

Page 96: ...20 Public batt_volt Ptemp Public Mux1 16 6 Public Mux2 16 6 Public VWResults 2 Public Amp1 16 Amp2 16 Public Temp1 16 Temp2 16 Public Therm1 16 Therm2 16 Public VWfreq1 16 VWfreq2 16 Public Sig2Noise1...

Page 97: ...String1 14 2 87777e 10 8 682e 5 0 20353 CoefString1 15 2 81051e 10 8 767e 5 0 19691 CoefString1 16 2 41462e 10 8 747e 5 0 19481 CoefString2 1 2 73949e 10 8 726e 5 0 20799 CoefString2 2 2 91941e 10 8 7...

Page 98: ...ef1 3 i 1 Digits PolyCoef2 3 i Next i Sensors 1 8 are excited over the freq range of 1000 2500 AVW200 VWResults 2 ComME 0 20 Mux2 1 1 2 1 8 1000 2500 2 _60Hz 1 0 Sensors 9 16 are excited over the freq...

Page 99: ...lacement sensors with no thermistors are attached to the fourth multiplexer SequentialMode Public batt_volt Public Mux 6 Public VWResults Public Temp1 16 Temp2 16 Temp3 12 Public Amp1 16 Amp2 16 Amp3...

Page 100: ...29 8 808e 5 Coef1 30 0 19576 Coef1 31 2 52871e 10 Coef1 32 8 804e 5 Coef1 33 0 19232 Coef1 34 2 27416e 10 Coef1 35 8 797e 5 Coef1 36 0 19552 Coef1 37 2 27264e 10 Coef1 38 8 798e 5 Coef1 39 0 19522 Co...

Page 101: ...Coef4 30 0 19576 Coef4 31 2 52871e 10 Coef4 32 8 804e 5 Coef4 33 0 19232 Coef4 34 2 27416e 10 Coef4 35 8 797e 5 Coef4 36 0 19552 Coef4 37 2 27264e 10 Coef4 38 8 798e 5 Coef4 39 0 19522 Coef4 40 2 877...

Page 102: ...Assign signal amplitude to Amp2 variable Sig2Noise2 i Mux 3 Assign signal to noise ratio to Sig2Noise2 variable FreqOfNoise2 i Mux 4 Assign frequency of competing noise to FreqOfNoise2 variable Decay...

Page 103: ...Assign signal amplitude to Amp2 variable Sig2Noise4 i Mux 3 Assign signal to noise ratio to Sig2Noise2 variable FreqOfNoise4 i Mux 4 Assign frequency of competing noise to FreqOfNoise2 variable Decay...

Page 104: ...Appendix H Additional Programming Examples H 12...

Page 105: ...ings for the AVW200 interfaces and the MD485 Multidrop modems A unique address must be assigned to each AVW200 in the network This address may be entered in the Deployment Communications or the Settin...

Page 106: ...AVW200s In this configuration you need one MD485 to connect with the datalogger and another MD485 for each AVW200 in the network see Figure I 3 18663 Null Modem Cable CABLE2TP L Cable Datalogger MD485...

Page 107: ...able attaches to the RS 232 port on the MD485 and the other end attaches to the RS 232 port on the datalogger see Figure I 4 I 2 2 MD485 to MD485 The connection between MD485s is made with a CABLE2TP...

Page 108: ...e RS 232 port on the AVW200 see Figure I 4 I 2 4 Multiplexer Connections Multiplexers can be used in this configuration but the AVW200 has to control the multiplexers Refer to Section 4 5 1 for inform...

Page 109: ...0000009 DataTable AVW200 1 1 DataInterval 0 10 Sec 10 Sample 6 Dst 1 1 IEEE4 Sample 6 Dst 2 1 IEEE4 EndTable DataTable AVWcard 1 1 CardOut 0 1 DataInterval 0 10 Sec 10 Sample 6 Dst 1 1 IEEE4 Sample 6...

Page 110: ...Appendix I Using MD485 Multidrop Modems with AVW200 Interfaces I 6...

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Page 112: ...ntific Canada Corp CSC 11564 149th Street NW Edmonton Alberta T5M 1W7 CANADA www campbellsci ca dataloggers campbellsci ca Campbell Scientific Centro Caribe S A CSCC 300 N Cementerio Edificio Breller...

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