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RST Instruments RST Flexi-Mux Instruction Manual

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RST Flexi-Mux
Instruction Manual
All efforts have been made to ensure the accuracy and
completeness of the information contained in this document. RST
Instruments Ltd reserves the right to change the information at any
time and assumes no liability for its accuracy.
Copyright © 2021. RST Instruments Ltd. All rights reserved.
Document Number: ELM0029B
Release Date:
April 12, 2021

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Summary of Contents for RST Instruments RST Flexi-Mux

  • Page 1 RST Instruments Ltd reserves the right to change the information at any time and assumes no liability for its accuracy. Copyright © 2021. RST Instruments Ltd. All rights reserved. Document Number: ELM0029B Release Date:...
  • Page 2 RST Flexi-Mux Instruction Manual EVISION ISTORY Rev. Revision History Date Prepared By Approved By Initial Release 2012-Mar-23 Removed all references to old Campbell 2021-Apr-12 loggers (CR10X, etc.), updated all schematics and photos, added more schematic examples, added an Appendix that includes CRBasic programming for each new schematic, added minimum clocking between readings >=500ms,...

  • Page 3: Table Of Contents

    RST Flexi-Mux Instruction Manual ABLE OF ONTENTS ........................1 VERVIEW ........................1 UNCTION ......................3 OMPATIBILITY ....................3 HYSICAL ESCRIPTION Layout ....................... 3 Dimensions ....................... 4 Connection Details .................... 4 ........................ 5 PERATION Control Terminals ....................6 5.1.1 Reset ...................... 6 5.1.2 Clock .......................

  • Page 4: Overview

    RST Flexi-Mux Instruction Manual VERVIEW The RST Flexi-Mux is designed to increase the number of sensors that can be measured with a datalogger. The Flexi-Mux is located between the datalogger and the sensors and allows a single channel of a datalogger to be sequentially connected to numerous sensors.

  • Page 5: Figure 2-1 Flexi-Mux Cascading Feature

    RST Flexi-Mux Instruction Manual 2-1 F IGURE LEXI UX CASCADING FEATURE Conveniently designed detachable screw terminals allow rapid wiring of large systems, with straightforward testing and substitution of both sensors and multiplexers. Built-in transient protection on every line safeguards against damaging power surges, which can be caused by occurrences such as nearby lightning.

  • Page 6: Compatibility

    RST Flexi-Mux Instruction Manual OMPATIBILITY The Flexi-Mux is compatible with, but not limited to, Campbell’s CR300, CR310, CR1000/X, and CR6 series dataloggers. A wide variety of commercially available sensors are supported provided the current maximums are not exceeded on the relay contacts (see Section 6).

  • Page 7: Dimensions

    RST Flexi-Mux Instruction Manual IMENSIONS The Flexi-Mux is housed in a slim 15.6cm x 8.1cm x 2.7cm (6.15” x 3.17” x 1.05”) aluminum case (Figure 4-2). Convenient mounting tabs extend 2.5cm (1”) from each end and provide simple means of mounting the unit on any flat surface or base plate. The finished length including the mounting tabs is 20.7cm (8.15”).

  • Page 8: Operation

    RST Flexi-Mux Instruction Manual 4-3 C IGURE ONNECTOR DETAIL The cable grips are spring loaded and require a small screwdriver to be inserted into the centre to retract the spring. Once retracted, insert the wire into the round hole and remove the screwdriver.

  • Page 9: Control Terminals

    RST Flexi-Mux Instruction Manual ONTROL ERMINALS The CR6 datalogger (or other Campbell Scientific Datalogger) connects to the Flexi-Mux as shown in Figure 5-1. Using a CR310, CR300, and CR1000X, a AVW200 is required to be used. Figure 5-4 further details the configuration.

  • Page 10: Clock

    RST Flexi-Mux Instruction Manual the common terminals (A, B, C, D) are electrically disconnected from all the sensor input channels. Reset should always connect to a datalogger control port. When programming, a delay (≥100ms) after setting Reset high must be included or the Flexi-Mux will not clock between ports.

  • Page 11: Connection Examples

    Campbell Scientific CR6 dataloggers. Please note that the following sections are simply meant as an overview of the many ways an RST Flexi-Mux can be used. Many custom applications can be created. Contact RST Instruments Ltd. for more details.

  • Page 12: 4-Wire Serial Switching

    RST Flexi-Mux Instruction Manual 5-3 A CR6 MPBX IGURE CONNECTING A LEXI UX AND AN 5.3.2 4-Wire Serial Switching Below is a configuration of a CR310 connected to a Vibrating Wire. CR310, CR300, and CR1000X require AVW200 while a CR6 does not. See Appendix A-2 for sample programs.

  • Page 13: 4-Wire Switching With Separate Excitation

    RST Flexi-Mux Instruction Manual 5-4 F AWV200 IGURE LEXI UX WITH INSTRUMENTS AND 5.3.3 4-Wire Switching with Separate Excitation Below shows separate excitation of a string of In-Place Inclinometers (IPI) and Vibrating Wire using two different sets of Mux configurations. Note: Figure 5-5 depicts configurations for IC7565B / IC7575B / IC7560B / IC7570 Series and Figure 5-6 depicts the configuration for the IPI27050 Series.

  • Page 14: Figure 5-5 Flexi-Mux With Biaxial Ipis And Vwp

    RST Flexi-Mux Instruction Manual 5-5 F IGURE LEXI UX WITH BIAXIAL S AND ELM0029B RST Instruments Ltd. Page 11...

  • Page 15: Figure 5-6 Flexi-Mux Ipi27050 Series

    RST Flexi-Mux Instruction Manual 5-6 F IPI27050 IGURE LEXI SERIES ELM0029B RST Instruments Ltd. Page 12...

  • Page 16: 8-Wire Series/Parallel Switching

    RST Flexi-Mux Instruction Manual 5.3.4 8-Wire Series/Parallel Switching A basic parallel of two FlexiMUX’s with VW connected to a CR6. 5-7 F IGURE LEXI UX WIRED IN PARALLEL TO SWITCH WIRES ATALOGGER ROGRAMMING For all the figures above, refer to the sample programs in Appendix A.

  • Page 17: Specifications

    RST Flexi-Mux Instruction Manual PECIFICATIONS 6-1 S ABLE PECIFICATIONS Power 12 Vdc (under load), unregulated Current Drain 10µA quiescent; 8mA active Reset Active Levels, max. 2.0V Clock Active Levels, max. 2.0V Min. Clock Pulse Width 1 ms Max. Actuation Relay Time...

  • Page 18: Sample Programming

    RST Flexi-Mux Instruction Manual AMPLE ROGRAMMING A-1. ERIAL WITCHING Refer to Figure 5-3. Const nVW = 4 Const nThm = 2 Const A=1.40503E-03 'log poly coefficients 3K therm Const B=2.36939E-04 Const C=1.01266E-07 Public Bunits(nVW),VW_therm(nThm) Public VW(nVW,5) Public Htz(nVW),Amp(nVW),S2N(nVW),NF(nVW),DR(nVW) Public kPa(nVW)

  • Page 19: A-2. 4-Wire Serial Switching

    RST Flexi-Mux Instruction Manual EndIf NextScan EndProg A-2. ERIAL WITCHING Refer to Figure 5-4. Const nVW = 5 Const A=1.40503E-03 'log poly coefficients 3K therm Const B=2.36939E-04 Const C=1.01266E-07 '\\\\\\\\\\\\\\\\\\\\\\\\\ DECLARATIONS ///////////////////////// Public Result,Bunits(nVW),VW_Temp(nVW) Public VW(nVW,6) Public Htz(nVW),Amp(nVW),S2N(nVW),NF(nVW),DR(nVW),Res(nVW) Public LnRTH...

  • Page 20: A-3. 4-Wire Switching With Separate Excitation

    RST Flexi-Mux Instruction Manual If TimeIntoInterval (0,60,Min)Then 'Default 1hr PortSet (SE2,1) 'Reset Delay(0,100,mSec) SerialOpen(Com1,38400,0,0,10000)'SET UP AVW200 COM For i=1 To nVW PulsePort (SE1,5000) 'Clock Delay(0,500,mSec) AVW200 (Result,Com1,0,200,VW(i,1),1,1,1,1500,3500,1,_50Hz,1,0) Htz(i)=VW(i,1)'frequency Amp(i)=VW(i,2)'amplitude S2N(i)=VW(i,3)'signal to noise ratio NF(i)=VW(i,4)'noise frquency DR(i)=VW(i,5)'decay ratio Bunits(i) = (VW(i,1)^2)/1000...
  • Page 21 RST Flexi-Mux Instruction Manual Public PTemp, Batt_volt 'VWP Const nVW = 10 Const A=1.40503E-03 ' log poly coefficients 3K therm Const B=2.36939E-04 Const C=1.01266E-07 Public Bunits(nVW),VW_Temp(nVW) Public VW(25,6) Public Htz(nVW),Amp(nVW),S2N(nVW),NF(nVW),DR(nVW) Public kPa(nVW) Units Bunits() = B Units Htz = Hz Units kPa() = kPa Units VW_Temp() = °C...
  • Page 22 RST Flexi-Mux Instruction Manual ipi_sn(1,4) = {47907} ipi_sn(1,5) = {47906} ipi_sn(1,6) = {47905} ipi_sn(1,7) = {47904} ipi_sn(1,8) = {47903} ipi_sn(1,9) = {47902} ipi_sn(1,10) = {47901} ipi_sn(1,11) = {47900} ipi_sn(1,12) = {47899} ipi_sn(1,13) = {47898} ipi_sn(2,1) = {47927} ipi_sn(2,2) = {47926}...
  • Page 23 RST Flexi-Mux Instruction Manual 'to check how many ipi's exist in the string, By default if an array is filled with zeros. Therefore, an array size of 10 but filled with 7 IPI S/Ns will have last 3 indexes be value ZERO.
  • Page 24 RST Flexi-Mux Instruction Manual sr_com_error(p,j) += 1 'increment error counter if exit condition not met Next k ipi_A(p,j) = parse(1) ipi_B(p,j) = parse(2) ipi_temperature(p,j) = parse(3) EndIf Next j SerialClose (ComC3) SW12 (SW12_1,0) 'turn off IPI Next p If n_ipi_strings <=5 Then...
  • Page 25 RST Flexi-Mux Instruction Manual Public ipi_data(5,5,3) Public modbus_result(5,5) Dim modbus_verfied = 1 Public modbus_verification As String * 64 = "Assigning and verifying modbus addresses" Public PTemp, Batt_volt Public Bunits(nVW),VW_Temp(nVW) Public VW(25,6) Public Htz(nVW),Amp(nVW),S2N(nVW),NF(nVW),DR(nVW) Public kPa(nVW) Public i,j Units Bunits() = B...
  • Page 26 RST Flexi-Mux Instruction Manual ipi_sn(4,4) = 80019 ipi_sn(4,5) = 80020 ipi_sn(5,1) = 80021 ipi_sn(5,2) = 80022 ipi_sn(5,3) = 80023 ipi_sn(5,4) = 80024 ipi_sn(5,5) = 80025 'Open serial port and power-up string SW12(SW12_1,1) 'Turn IPI On Delay(0,10,sec) PortSet (U8,1) 'Reset Delay(0,100,mSec)

  • Page 27: A-4. 8-Wire Series/Parallel Switching

    RST Flexi-Mux Instruction Manual SW12(SW12_1,0) 'Turn IPI Off Scan (1,Min,0,0) PanelTemp (PTemp,60) Battery (Batt_volt) If TimeIntoInterval (0,30,Min) Then 'Enter loop every 30mins PortSet (U2,1) 'Reset Delay(0,100,mSec) For i=1 To 10 PulsePort (U1,5000) 'Clock Delay(0,100,mSec) VibratingWire (VW(i,1),1,U3,1500,3500,1,0.05,"",60,A,B,C) Htz(i)=VW(i,1)'frequency Amp(i)=VW(i,2)'amplitude S2N(i)=VW(i,3)'signal to noise ratio...
  • Page 28 RST Flexi-Mux Instruction Manual Public PTemp, Batt_volt Public Bunits(nVW),VW_Temp(nVW) Public VW(25,6) Public Htz(nVW), Amp(nVW), S2N(nVW), NF(nVW),DR(nVW) Public kPa(nVW) Public i Units Bunits() = B Units Htz = Hz Units kPa() = kPa Units VW_Temp() = °C Units NF = Hz...

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