Microlink 752 User Manual
Contents
1. bered channel is used as input for lead compensation input to supply the resistance measuring current of 1 milliamp Remember that you can assign channel functions on a channel by channel basis This means that you can measure say 2 resistances 4 channels and 12 voltages 12 channels 2 5 Microlink 752 Manual When the resistance to be measured is small the resistance in the leads to the RTD can significantly affect accuracy The odd numbered channel arrangement gives excellent results for all wiring configura tions including 2 wire 3 wire 4 wire and 4 wire compensated 2 Wire In this configuration lead resistance is an additive error but can be tolerated in those applications which do not require high absolute accuracy Figure 2 2 Two Wire Configuration 3 Wire This is probably the most widely used configuration The resistance of 1 lead is measured and used to perform a compensation for the resistances in the other leads to the RTD Figure 2 3 Three Wire Configuration 4 Wire This is the configuration that gives the most accurate measure ment The measuring current is applied via 2 of the leads and the voltage drop across the RTD is measured with a high input impedance device using the other 2 leads Figure 2 4 Four Wire Configuration 2 6 Installing the Microlink 752 USB Unit 4 Wire Compensated In this arrangement the resistance across the dummy leads is mea sured and used as c2. are fitted such as protection from high voltages There are two units available to the Microlink 752 590 Screw Terminals 590 8A Screw Terminals and Current Measurement The 59x range is optional so you can ignore this section if you have bought just the Microlink 752 and Windmill package 2 10 1 590 Unit Screw Terminals The 590 is a boxed screw terminal card Extra facilities are available with this card including e noise filtering input protection from high voltages higher voltage inputs than normal contact closure inputs ac inputs biasing to ground external current source switching programmable resistance special output ranges Connection The 590 unit has space for 3 rows of 18 screw terminals The row nearest the front panel is connected to pin 19 of the analogue input D connector on the front of the Microlink This pin is connected to 0 V The other 2 rows are connected to pins 1 18 and 20 37 as indicated by the small figures by the terminals Microlink 752 Manual RTDs with 590 Units When using connection boxes with RTDs care must be taken not to introduce errors due to lead resistance For this purpose two 0 V paths are provided e Current Return should be used for measuring the current flow to 0 V e 0 V itself should be reserved FITTING APPLICATION COMPONENTS Series Components Component positions S1 to S37 0 4 inch pitch are available to mount components in series with D type pins 1 t
3. set alarm levels e set engineering unit conversion Special Hardware Commands The channel dialogue boxes will have the Special button enabled This allows access to the following commands Recalibrate Forces an immediate recalibration of the whole board This is in addition to the periodic calibration cycles which happen automatically Cal_Interval Displays the time between automatic calibration cycles as selected in ConflML described in Section 3 4 2 Resolution Displays the resolution and integration time for this card as selected in ConflML described in Section 3 4 2 4 2 Using Windmill Software with the Microlink 752 Show_Cal_Data Used only during manufacturer s test procedures 4 2 2 Digital Ports Setting the Direction of the Port Input or Output The Windmill 752 unit provides three digital ports each with 8 lines You can use each port for input or output You can explicitly control the choice or it can be deduced automatically by the software All ports start as inputs but if any data is sent to a port by a Windmill program it immediately switches to output mode Output lines can also be controlled by the alarm detection features of the input channels This will cause the whole port to switch to output mode You can also use port 2 for event counting in which case you must set it as an input The channels are numbered as follows 0100 Line O of port 0 0101 Line 1 of port O 0102 Line 2
4. software 4 4 Using Windmill Software with the Microlink 752 4 2 3 Event Counters The Windmill 752 unit provides eight 16 bit event counters The default names are 0200 0201 0202 etc Each counter starts at zero and counts pulses on the corresponding input lines to a maximum of 65535 They can be reset to zero at any time by sending 0 to the channel using the AnalogOut Graphics or Test Seq programs No other values can be sent to the counters You can use SetupIML to e change the names e enable or disable each channel e choose one of two operating modes accumulating count or resetting count e apply a scale factor or offset to the count Accumulating Count Simply keeps counting until explicitly reset Resetting Count Starts again from zero after each reading This shows the num ber of pulses since the last reading but it can only be used where a single program is reading the counter If several differ ent programs were accessing the counter simultaneously they would all be resetting it at different times so the results would be unpredictable Scale Factor and Offset SetupIML lets you apply a scale factor and offset to the count For example if the pulses came from a flow meter which pro duced one pulse for each 50 millilitres then a scale factor of 0 05 would give a reading in litres 4 5 Microlink 752 Manual 4 2 4 Analogue Outputs The 752 provides two analogue output channels They ar
5. with no other connection Although the difference between the inputs is well defined the actual voltage at each input could be anything Connecting one end of the bat tery to the O V input either direct or via a resistor would solve the problem The 0 V of the Microlink 752 is connected to computer earth which is usually connected to the mains earth When making your connec tions you should follow this policy a If your signal source is floating i e has no reference to mains earth then you must provide a reference by connecting one end of it to the O V input either direct or via a resistor The resistor could 2 4 Installing the Microlink 752 USB Unit have any value up to several MQ However large values could cause 50 Hz problems if your signal source has much leakage to earth b If your signal source is itself earthed then you should connect only positive and negative inputs You should make no connection to Microlink 752 earth OV pin 19 Floating Signal Channel input Source MICROLINK Channel input MICROLINK Figure 2 1 For floating signals you need to connect one end of the signal to the O V input on pin 19 2 5 2 Resistance Measurement When monitoring resistance you use adjacent pairs of input chan nels Each even numbered channel monitors the voltage across the test resistor see page 10 for input channel numbering Each odd num
6. 1 Installing and Configuring Windmill Software Installing and Configuring Windmill Software 3 1 Introduction There are two steps to installing and configuring the Windmill measurement and control software 1 Install the software onto the hard disk 2 Tell the software about your measurement hardware For installation you will need a personal computer with a USB port that is running Windows 98SE or later 3 2 What is Windmill Software Windmill is a ready to run suite of applications for data acquisition and control You can be up and running in very little time as no programming is required The standard suite includes data logging charting and output control applications You can also transfer data directly into third party applications like Microsoft Excel or Access Other Windmill modules are available see the Windmill Software Internet catalogue for details http Awww windmillsoft com 3 3 Installing Windmill Software 1 Connect the 752 data acquisition unit to your computer as detailed in Chapter 2 2 Install the Windmill software Insert the CD The Installation software should run automatically If not select Run from the Start menu and type d setup where d is your CD drive 3 1 Microlink 752 Manual 3 When installation is complete the Windmill Configuration program ConfIML automatically starts This asks for details of your hardware See Section 3 4 for details 3 3 1 Upgrading From E
7. 16 differential inputs 2 4 5 digital input and output 2 11 12 2 16 3 2 3 earth 2 4 5 event counter 2 13 2 16 4 5 filter 2 20 ground 2 4 5 high voltage 2 19 id code 2 2 4 input see analogue input see digital input and output input filter 2 20 input protection 2 19 20 installing Microlink 752 unit 2 1 19 Windmill software 3 1 2 introduction 2 1 low pass filter 2 20 moving Windmill software 3 2 multi bit channels 4 4 new hardware 3 3 noise 2 19 20 output 2 11 see analogue output see digital input and output plug 2 1 power 2 1 programmable resistance 2 19 range 2 9 resistance 2 5 7 2 19 screw terminals 2 19 SetupIML 4 2 6 software see Windmill software specifications 2 17 18 totalise counter 2 13 2 16 4 5 upgrading Windmill software 3 2 voltage input see analogue input see digital input and output Windmill software 2 1 3 1 7 ConflML 3 3 7 installing 3 1 2 moving 3 2 other modules 4 7 SetupIML 4 2 6 upgrading 3 2
8. Microlink 752 Manual Biodata Limited Manual Code 752PDF 1 2 Issue Date November 2015 Information in this document is subject to change without notice O Biodata Limited 2015 10 Stocks Street Manchester M8 8QG UK Telephone 44 0 161 834 6688 Facsimile 44 0 161 833 2190 E mail sales microlink co uk http www microlink co uk Table of Contents Table of Contents Introduction 1 1 Installing the Microlink 752 USB Unit 2 1 2 1 Introduction 2 1 2 2 Plugging the Microlink 752 into the Computer 2 1 2 3 The Microlink s Lights 22 2 4 Using Several Microlink 752 Units 22 2 5 Analogue Input Connection Notes 2 4 2 6 Digital Input and Output Connection Notes 2 11 2 7 Counter Connection Notes 2 13 2 8 Analogue Output Connection Notes 2 14 2 9 Specifications 2 17 2 10 The 59x Screw Terminal Units 2 19 Installing and Configuring Windmill Software 3 1 3 1 Introduction 3 1 3 2 What is Windmill Software 3 1 3 3 Installing Windmill Software 3 1 3 4 Configuring Your System 3 3 Using Windmill Software with the Microlink 752 4 1 4 1 Introduction 4 1 4 2 Options in SetupIML 4 2 4 3 The Rest of the Windmill Software Suite 4 7 Introduction Introduction Thank you for purchasing the Microlink 752 Resistance Measurement and Control Package This Manual tells you e About the Microlink 752 unit and how to connect your signals Chapter 2 e How to install the Windmill software Chapter 3 e How to use Windmill soft
9. ach count up to 65535 These are located on Port 2 of the digital I O connector If you are using counters set Port 2 as an input only using the Windmill SetupIML software The 752 unit monitors the state of the 8 input lines once every milli second and maintains a count for each of them It does this whether or not you intend to use the lines as counters You can still read Port 2 as a normal digital input even if you are also using it to count 2 7 1 Input Voltages See Section 2 6 1 for safe voltage levels 2 7 2 Count Inputs A valid count is declared if the input is low for 2 milliseconds then high for two milliseconds This gives a theoretical maximum count speed of 250 Hz 2 7 3 Pin Numbers Make the counter connections to Port 2 of the Digital Connector The counter pin numbers are on page 2 16 Microlink 752 Manual 2 8 Analogue Output Connection Notes Two analogue output channels are provided These are available as either voltage or current Wire to the one that you want The voltage outputs are 0 10 240 V The current outputs are 0 20 480 mA Range Value per bit Voltage 0 10 240 V 2 5 mV Current 0 20 480 mA 0 05 mA The virtue of this arrangement is that many real world systems that are nominally 10 V may in fact require slightly more voltage because of production tolerances The analogue output pin numbers are on page 2 16 2 8 1 Current Output This output produces a current which is proportional to th
10. arlier Versions of Windmill You can run Windmill alongside earlier versions of the software Once you are happy that you no longer need a previous copy of Windmill simply run its Uninstall program to delete it 3 3 2 Running Several Copies of Windmill Unless you have bought a multiple licence you are only permitted to run one copy of the software at any one time Please contact your supplier if you require a multiple licence 3 3 3 Installing under Windows 7 8 and Later For Windows 8 and 10 see http www windmill co uk usb device windows8 html For Windows 7 see http www windmill co uk install hardware windows7 html 3 2 Installing and Configuring Windmill Software 3 4 Configuring Your System The Windmill Configuration program ConflML records the details of your data acquisition hardware It will run at the end of the installation process and you should run it again from Windows whenever your acquisition hardware changes for example when you install additional units Configure IML Hardware xi Hardware Device Save Device 0 Software Signal Generator Seven Channels Cancel Settings komme r DA _ _ Software Signal Generator Remove IML device number 0 module number 0 eae a Directory Confiml 6 00 9 Copyright Windmill Software Ltd 2003 Hel Help Figure 3 1 The C
11. ctions which is essential when using thermocouples You can use chan nels not required for thermocouples for general voltage measurement Strain Bridges Choose this if you are using a 594 strain gauge bridge connection unit This monitors an external bridge excitation supply so that strain gauge outputs can be converted into readings in 3 4 Installing and Configuring Windmill Software microstrain Again you can use channels not required for strain for general voltage measurement Select the Integration Time Resolution This allows you to select the trade off between speed precision and noise rejection Seven settings are available the slower the speed the better the precision and the more random noise is averaged out The exact speeds and resolutions vary with the computer transducer type and so on but the following table gives some typical figures Setting Typical Speed Voltage Resolution 12 bit 80 reads sec 5 mV in 10 V 13 bit 64 reads sec 3mVin 10 V 14 bit 48 reads sec 1 5 mV in 10 V 15 bit 32 reads sec 0 8 mV in 10 V 16 bit 16 reads sec 0 4 mV in 410 V 18 bit 6 reads sec 0 1 mV in 410 V Settings from 15 bit to 18 bit will be effective at removing 50 Hz mains noise as these integrate over one or more complete mains cycles The resolution figures show the ability to detect small changes The absolute accuracy will depend on several factors including your transducers Interval Between Automatic Recalibrat
12. dmill You do not need to run ConflML again unless you add more units or want to change the settings After closing ConflML start the SetupIML program and choose how you wish to use the hardware Refer to the next chapter and SetupIML s Help file setupiml hlp for details 3 4 5 The Software Signal Generator In addition to data acquisition and control hardware ConflML lists the Software Signal Generator This is a special driver which simulates a device with seven channels each channel producing a different sig nal No special hardware is required the data values are produced by calculation The Software Signal Generator lets you experiment and practise with Windmill without being concerned about the hardware 3 6 Installing and Configuring Windmill Software To install the signal generator you first need to add it to the list of devices In the ConflML Summary window press the Add button Section 3 4 1 Select Software Signal Generator and again press the Add button You re taken to the Hardware Settings dialogue Section 3 4 2 where you can choose options for five of the channels Press the Help button in this dialogue for more information on the signal generator 3 4 6 The IML Device Icon Whenever you run a Windmill program one or more IML Device icons will appear Different icons identify different hardware drivers software signal generators and so on The Windmill applications can t run without these so don
13. e called 0300 and 0301 by default but you can use SetupIML to change the names The output is controlled by sending values to the channels using the AnalogOut control panel or one of the optional Windmill programs such as Graphics The default units are percent of full scale The 12 bit digital to analogue converter can produce 4096 equally spaced steps between 0 and 99 976 of full scale The software will always pick the step closest to the value you have requested Using SetupIML you can define a scale factor and offset which will change the percentage figures into your chosen units using this formula Engineering Units Scale x Percentage Offset For example setting scale factor to 0 1024 and offset to zero the numbers used by the software will be 0 to 10 24 which would represent the actual output voltage if the hardware was wired in this way You could then alsochange the name of the units from percent to volts 4 6 Using Windmill Software with the Microlink 752 4 3 The Rest of the Windmill Software Suite The Windmill suite of software that comes with the 752 comprises ConfIML SetupIML the display and control panels AnalogOut DigitalOut 8 DDE Panel Logger and Chart The display and control panels let you send data to or display data from any number of analogue and digital channels Logger logs data to disk from up to 100 channels whilst Chart displays moving charts of data from up to 8 channe
14. e voltage on the voltage output This means that it can potentially produce cur rent even if you are using a voltage range If you do not wish to use a current output leave it unconnected The current outputs are current sink the current flows into the cur rent output and then to 0 V To use the current output you will need an external power supply 6to 30 V and a load to drive The power supply must be of sufficient voltage that with 20 mA flowing Supply Voltage gt voltage across load voltage drop in wiring 6 The 6 V is the minimum voltage at the current output that will enable it to sink 20 mA The power supply and load can be connected in 2 ways The sim plest is to connect the power supply negative to 0 V and to connect the load between power supply positive and the current output An alterna tive is to connect the power supply positive to current output and to connect the load between power supply negative and 0 V If the exter nal circuit already has an earth connection you may be forced into one Installing the Microlink 752 USB Unit of these arrangements Remember that the 0 V of the computer is normally connected to supply earth LOAD Current Power Supply Output aan 6 30 V OV Current Output Power Supply ON 6 30 V LOAD Figure 2 9 Current Output Connections 2 8 2 Digital Input Output Counter and Analogue Output Pin Connections Table The pin numbers given on the next page are those for the digi
15. he voltage of the previous channel and has little incentive to change when connected to an open circuit 2 5 6 Analogue Input Pin Numbers Make your connections to the analogue 37 way D connector as detailed in the following table 2 9 Microlink 752 Manual Microlink 752 16 Analogue Inputs Pin Connections for 37 Way D Plug Wiring View 19 OV 15 V 37 18 15 V Auxiliary 36 17 Auxiliary Input 15 35 16 Input 15 Input 14 34 15 Input 14 Input 13 33 14 Input 13 Input 12 30 13 Input 12 Input 11 31 12 Input 11 Input 10 30 11 Input 10 Input 9 29 10 Input 9 Input 8 28 9 Input 8 Input 7 27 8 Input 7 Input 6 26 7 Input 6 Input 5 25 6 Input 5 Input 4 24 5 Input 4 Input 3 23 4 Input 3 Input 2 22 3 Input 2 Input 1 21 2 Input 1 Input 0 20 1 Input 0 Please read the Analogue Input Connection Notes on the previous pages before making your connections 2 10 Installing the Microlink 752 USB Unit 2 6 Digital Input and Output Connection Notes The Microlink 752 provides digital input to the computer and output control by the computer lts 24 general purpose input and output lines are arranged in 3 groups or ports Each port can be either input or output set using the Windmill SetupIML program All ports power up as inputs The ports are referred to as Port O to Port 2 Port 2 also functions as 8 event counte
16. ions in Minutes This selects how frequently the software pauses to perform a recalibration of the Microlink 752 using its stable on board refer ence voltages This will cancel any errors introduced by temper ature or power supply changes since the last recalibration but can take up to a second to complete During this time no read ings may be taken You can vary the interval from 1 to 1440 min utes 24 hours but every 20 minutes is generally sufficient 3 5 Microlink 752 Manual 3 4 3 752 Devices After making your choices and pressing OK the ConflML Summary window appears showing your 752 as four hardware devices 752 analogue inputs 752 digital ports 752 event counters and 752 analogue outputs 3 4 4 Setting the Working Directory When you use Windmill you will create two types of files those which hold data and those which hold the Windmill programs settings You can specify a default folder in which to store these files known as the Working Directory Initially the working directory is set to wherever you installed Windmill To change this press the Directory button Choose a new directory folder and press Save Windmill will cre ate two sub directories under this choice called setup and data By default all the Windmill settings will be stored in setup and all the data you collect stored in data 3 4 4 Saving the Settings Save your settings and they will be used every time you run Win
17. it helpful to label your 752s with their codes Set the ID code before connecting the Microlinks to the PC 2 3 Microlink 752 Manual 2 5 Analogue Input Connection Notes The Microlink 752 provides 16 differential analogue input channels You can use these to monitor 16 voltages or 8 resistance devices such as RTDs or a combination of the two For example you can measure 12 voltages and 2 resistances The 752 uses an integrating analogue to digital converter where the integration time and resolution are under software control You set these with the Windmill ConflML program which starts automatically when you install the software 2 5 1 Differential Inputs All the inputs are differential for each input signal there are two sig nal wires The measurement is the difference in voltage between the two wires The two signals go into separate high impedance amplifiers which monitor the voltage between the input and ground The outputs of the two amplifiers are then subtracted to give the difference between the and inputs For small signals differential inputs are much better than single ended inputs because the subtraction of the voltages on each of the input wires means that any voltage common to both wires is removed so reducing noise It is important to remember that the voltages at both inputs must be within the amplifier operating range A classic error is to connect a bat tery between positive and negative inputs
18. ls For more channels or different logging and charting speeds simply run more instances of Logger and Chart Full details of all these programs are given in their on line Help files and the Windmill User Manual Should you need more sophisticated analysis or presentation you can share data with other Windows applications using dynamic data exchange DDE For example you can process data as it s collected using Microsoft Excel See the DDE Panel Help file for more details There are many other optional programs in the Windmill range Graphics lets you design and create your own Windmill displays process mimics wiring diagrams bar charts annunicator pan els whatever you wish Test Seq interprets a file of commands and controls a test rig accordingly Replay replays a data file graphically For details of other optional programs see http Awww windmill co uk programs html To be informed when new Windmill products are launched be given data acquisition hints and tips and read articles on measurement and control subscribe to the free Monitor newsletter ISSN 1472 0221 at http www windmill co uk newsletter html 4 7 Index Index 590 screw terminal unit 2 19 590 8A current unit 2 19 20 ac input 2 19 analogue input 2 4 10 4 2 analogue output 2 16 biasing to ground 2 19 changing hardware settings 3 3 ConfIML 2 4 3 3 7 contact closure 2 11 2 19 counter 2 13 2 16 4 5 current input 2 20 current output 2
19. ment is not needed RL ve channel 7 RL ve channel 6 Ri ve channel 6 RL OV ve channel 7 Figure 2 8 Four Wire Connection to Channel 6 2 8 Installing the Microlink 752 USB Unit 2 5 3 Input Voltage Range The Microlink 752 operates correctly with input voltages in the range 11 V The inputs will reject voltages which are common to both positive and negative inputs These common mode voltages could be as big as 13 V 2 5 4 Maximum Input Voltage The input multiplexers are protected against dc voltages of 33 V above the power supply This means 48 V if the computer is switched on 33 V if it is switched off If the over voltage is transient then protection extends as far as 300 V When a voltage above the power supply is applied to the unit its protection mechanism comes into ac tion and this draws some current from the signal source This effect can be a problem when the computer is switched off as it now draws current from any signal This current is limited by 4K7 resistors Extra series resistors can be added to reduce this fault current 2 5 5 Unconnected Inputs You can leave unused inputs unconnected but if you attempt to read from these unconnected inputs do not expect to get 0 V They could be any value If another connected channel has recently been read the unconnected input will return a similar value This is not crosstalk It occurs because the input capacitance of the amplifier is charged to t
20. o 37 Only S1 and S37 are named on the PCB because of lack of space How ever the numbering sequence is the same as that of the nearby B1 to B37 components To fit a component in series with for example pin 10 e Place the component in the S10 position level with B10 e Solder it on the copper side e Cut the track under S10 at the point where it narrows The main application of series components is series protection resistors These could have any value from hundreds of ohms to megohms depending on requirements Parallel Components Component positions PO to P17 0 2 0 3 0 4 inch pitch are pro vided to mount components across analogue inputs O to 15 16 is the auxiliary input 17 completes the pattern Components can be simply soldered into these positions Input Filters Low pass analogue input filters can be produced by fitting resis tors in the 2 series elements of an analogue channel and a capacitor in the parallel element For instance a filter can be implemented on channel 1 by fitting resistors to S2 and S21 and 2 20 Installing the Microlink 752 USB Unit a capacitor to P1 Typical values would be 10 KQ and 1 uF These would produce a cut off frequency of about 8 Hz 2 10 2 590 8a Unit Screw Terminals with Current Measurement The 590 8A is a boxed milliamp current detection card arranged as 8 current and 8 voltage inputs The same extra facilities are available with this card as with the 590 2 2
21. of port 0 0107 Line 7 of port 0 0108 Direction control signal for port 0 0109 not used 0110 Line O of port 1 0111 Line 1 of port 1 0117 Line 7 of port 1 0118 Direction control signal for port 1 0119 not used 0120 Line 0 of port 2 0121 Line 1 of port 2 0127 Line 7 of port 2 0128 Direction control signal for port 2 0129 not used 4 3 Microlink 752 Manual Renaming Channels and Digital States In SetupIML you can replace the channel numbers with mean ingful names By default each channel is linked to a single line and the two digital states are called ON and OFF You can also change these names to more suitable ones for example FAST and SLOW or OPEN and SHUT Grouping l O Lines into Multi Bit Channels SetupIML lets you group the lines within each port into multi bit channels which are displayed or controlled as single values transferred via the first channel in the group Multi bit values can be chosen as binary decimal or hexadecimal e g Binary Decimal Hexadecimal 11 3 3 1010 10 A 10001 17 11 11111111 255 FF Channels 0108 0118 and 0128 are the direction control signals for ports 0 1 and 2 respectively When set to 0 the whole port is used for input when 1 the port is used for output These chan nels can be viewed and also altered but they are normally dis abled and must be explicitly enabled from SetupIML before use As noted above direction control can usually be sensed auto matically by the
22. ompensation Figure 2 5 Four Wire Compensated Configuration Resistance Connections When an even numbered channel is programmed for resistance measurement the adjacent odd channel is used to supply the 1 mA constant current and measure the lead resistance A 2 wire connection to channel 0 is shown below Ri Ve channel 1 ve channel 0 ve channel O Ri OV ve channel 1 Figure 2 6 Two Wire Connection to Channel 0 The measurement current flows from the ve of channel 1 via the resistor to 0 V Channel 0 measures the voltage across the resistor Since lead resistance measurement is not needed the ve of channel 1 is connected to 0 V A 3 wire connection to channel 2 is shown in Figure 2 7 The mea surement current flows from the ve of channel 3 via the resistor to 0 V Channel 2 measures the voltage across the resistor and one lead The 2 7 Microlink 752 Manual ve of channel 3 measures the voltage across one lead Software subtracts the two measures to determine the resistance RL ve channel 3 ve channel 2 ve channel 2 Ri ve channel 3 Ri OV Figure 2 7 Three Wire Connection to Channel 2 A 4 wire connection to channel 6 is shown in Figure 2 8 The mea surement current flows from the ve of channel 7 via the resistor to OV Channel 6 measures the voltage across the resistor with no contribu tion from lead resistance The ve of channel 7 is connected to OV since lead resistance measure
23. onfIML Main Window The first thing you need to do is press the Add button to include your Microlink 752 unit 3 4 1 Adding New Hardware The Add IML Hardware dialogue lists the acquisition and control devices for which you have installed drivers Select the Microlink 752 unit and press the Add button This will take you to the Hardware Settings dialogue Section 3 4 2 3 3 Microlink 752 Manual 3 4 2 Changing Hardware Settings ConflML needs to know some information about your 752 unit Press the Help button or see below if in doubt about the answers Which Type of Card do you have Choose the Microlink 752 ID Code of the 752 Unit As you can connect several 752s to your PC you need to tell ConflML which one you are currently configuring Do this by selecting the correct ID Code If you have only one 752 its ID Code is 0 There should be as many ID codes as there are 752 units connected and each code should be different If not change the codes on individual units as detailed in Section 2 4 Which Type of Transducer Connection Unit is Attached There are three options Which you choose depends on the 59x units you have connected None General Purpose Choose this if you e are not using a 59x unit are using a 590 screw terminal voltage unit or are using a 590 8A screw terminal current unit Thermocouple Choose this if you are using a 593 thermocouple terminal unit This monitors the temperature of conne
24. rs detailed in Section 2 7 2 6 1 Input Voltages All inputs are high impedance CMOS type They are TTL and 5 V CMOS compatible Input voltages should be within the range 0 to 5 V Higher Voltages can be dealt with by the addition of resistor networks This can be conveniently done on a 590 unit Section 2 10 Input protection can be provided in a similar manner 2 6 2 Contact Closures You can interface to contact closures using a resistor to tie the input to either 5 or 0 V The contact then switches the line to either 0 or 5 V The resistor can be fitted to a 590 unit 2 6 3 Noisy Inputs Input Filters can be fitted to a 590 unit if required 2 6 4 Output Drive The outputs are TTL and 5 V CMOS compatible They can drive 15 LSTTL loads You can increase the output drive by using additional transistors which can be fitted to the 590 unit Currents of 1 amp can easily be switched 2 6 5 Power Up State The 752 unit will power up as all inputs If you intend to use the card to control outputs then you may want to define logic states at power up This can be done by resistors which tie the lines to either 0 or 5 V mounted on a 590 unit Microlink 752 Manual 2 6 6 Pin Numbers Make the I O connections to the digital 37 way connector See the Pin Connections Table on page 2 16 Installing the Microlink 752 USB Unit 2 7 Counter Connection Notes The 752 provides eight 16 bit totalise event counters which can e
25. t close them whilst using Windmill 3 7 Using Windmill Software with the Microlink 752 Using Windmill Software with the Microlink 752 4 1 Introduction This chapter explains which settings in the Windmill SetupIML program apply to the 752 and about the rest of the Windmill software suite You can use the Microlink 752 for monitoring resistance and voltage for digital input and output for counting and for analogue voltage or current output Before starting Windmill make sure your 752 is plugged into the computer s USB port and if you are using a 59x unit that it is plugged into the 752 s analogue input connector 4 1 Microlink 752 Manual 4 2 Options in SetupIML SetupIML is the Windmill program that lets you save libraries of setup files each holding details about how you want to use individual channels A Windmill 752 is shown as four devices in SetupIML Analogue Inputs Digital Inputs Event Counters and Analogue Outputs Choose one from SetupIML s Device menu Now double click a channel to configure it Full details of using SetupIML are in its Help file setupiml hlp and Chapter 3 of the Windmill User Manual 4 2 1 Analogue Inputs The input channels are numbered 0 to 15 Using SetupIML you can configure each channel as follows e enable or disable e re name e set to a specific input range or allow the software to pick the range automatically e give anew units name scale factor and offset e
26. tal I O counters and analogue output 37 way D socket The analogue input pin numbers are on page 2 10 Microlink 752 Manual Microlink 752 Pin Connections for Digital Inputs Outputs Counters and Analogue Outputs 19 OV Output 1 Voltage output 37 18 OV Output 0 Voltage output 36 17 OV Output 1 Current output 35 16 OV Output O Current output 34 15 OV Port 2 Bit 0 33 14 Port 2 Bit 1 Port 2 Bit 2 32 13 Port 2 Bit 3 Port 2 Bit 4 31 12 Port 2 Bit 5 Port 2 Bit 6 30 11 Port 2 Bit 7 Not used 29 10 ID Code 2 ID Code 0 28 9 ID Code 1 Port 1 Bit 0 27 8 Port 1 Bit 1 Port 1 Bit 2 26 7 Port 1 Bit 3 Port 1 Bit 4 25 6 Port 1 Bit 5 Port 1 Bit 6 24 5 Port 1 Bit 7 Port 0 Bit O 23 4 Port 0 Bit 1 Port 0 Bit 2 22 3 Port 0 Bit 3 Port 0 Bit 4 21 2 Port 0 Bit 5 Port 0 Bit 6 20 1 Port 0 Bit 7 Please read the Connection Notes on the previous pages before making your connections 2 16 Installing the Microlink 752 USB Unit 2 9 Specifications 2 9 1 Microlink 752 Unit Dimensions mm 180 x 120 x 40 Maximum number of 752s 8 Maximum length of cable 5 m per cable Maximum distance from PC can be increased by use of USB hubs 2 9 2 Analogue Inputs Max number of voltage inputs 16 Max number of resistance inputs 8 Maximum safe input voltage Computer on 48 V Computer off 33 V Transient 300 V Voltage Ranges 10 V 1 V 100 mV 10 mV Resistance Ranges 0 100 0 1000 Q Common mode range 13 V Relati
27. unit 2 1 Microlink 752 Manual If you have several 752 units make sure their ID codes are set Section 2 4 before plugging them into the PC 2 3 The Microlink s Lights The Microlink 752 has a green light labelled ENUM and a red light labelled BUSY Neither of these will come on until you have installed the Windmill software ENUM ENUM stands for Enumerated This is lit when the Microlink has been powered on by the USB plug and play controller It is a good indication that the Windmill USB driver software has been correctly loaded BUSY This is lit for the duration of each USB communication It is not active until the Microlink has been enumerated 2 4 Using Several Microlink 752 Units As you can connect up to eight Microlink 752s to the USB each one must have some way of identifying itself This is provided by 3 pins on the digital connector If you have just the one Microlink 75x its ID Code will be 0 and you can ignore this section The pins in question are numbers 28 9 and 10 You set an ID code by connecting these pins to 0 V as follows ID Code Pin 10 Pin 9 Pin 28 0 no no no 1 no no yes 2 no yes no 3 no yes yes 4 yes no no 5 yes no yes 6 yes yes no 7 yes yes yes 2 2 Installing the Microlink 752 USB Unit See the Pin Connections Table on page 2 16 Make a note of the ID Codes you ll need them when using Windmill ConfIML to install the driver software For quick identification you may find
28. ve accuracy of ranges gain 1000 0 1 gain 1 10 100 0 05 A D performance set from software Resolution bits Integration Time msec 12 25 13 5 14 10 15 20 16 40 18 160 Maximum speed of sampling 10 reads per second per channel up to a maximum of 80 reads per second Maximum linearity error 0 02 Input impedance 100 MQ Microlink 752 Manual 2 9 3 Digital Inputs and Outputs Maximum number of inputs Maximum number of outputs Power up state Maximum speed Voltage Inputs Compatibility Range Voltage Outputs Compatibility Drive 2 9 4 Counters Maximum number of counters Resolution Type of counters Maximum count speed Compatibility Input voltage range 2 9 5 Analogue Outputs Number of outputs Resolution Output voltage range Current Outputs Output current range Maximum safe voltage range Voltage drop from current output to O V at 20 mA 24 24 all inputs 160 channels per second TTL and 5 V CMOS 0t0o5V TTL and 5 V CMOS 15 LSTTL loads 8 16 bits Event totalise 160 counts per second TTL and 5 V CMOS 0t05V 2 voltage or 2 current 12 bits 0 10 240 V 0 20 480 mA 30 V 6 V Maximum Installing the Microlink 752 USB Unit 2 10 The 59x Screw Terminal Units The Microlink 59x range provides screw terminals for the Microlink 752 allowing signals to be permanently wired These boxed 59x units sit next to the Microlink 752 Extra facilities are available when compo nents
29. ware with the 752 unit Chapter 4 To use the 752 system you need a PC with a USB port It should be running Windows 98SE or later 1 1 Installing the Microlink 752 USB Unit Installing the Microlink 752 USB Unit 2 1 Introduction The Microlink 752 unit plugs into the USB universal serial bus socket of your PC It provides 8 resistance inputs or 16 voltage inputs 24 digital inputs outputs 8 counters and 2 analogue outputs which can be voltage or current You can use the 752 to measure temperatures using resistance temperature devices RTD or Pt100 Other variable resistance transducers can also be monitored The 752 has two 37 way connectors one for analogue input con nections and one for digital counter and analogue output connections If you prefer you can make your connections to screw terminals using one of the optional Microlink 59x range of external units This chapter tells you how to connect your signals to the Microlink 752 and about the 59x screw terminal units After making your connec tions see Chapter 3 for details of installing the Windmill software 2 2 Plugging the Microlink 752 into the Computer Plugging the Microlink into your PC could not be easier just use the USB cable provided You don t have to switch off your computer first or even restart Windows The Microlink 752 is powered from the USB port unless you are using current outputs Section 2 8 you don t need an extra power supply
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