microDAQ - Chell Instruments
Contents
1. Chell Instruments Ltd Folgate House Folgate Road North Walsham Norfolk NR28 OAJ ENGLAND Chell Tel 01692 500555 Fax 01692 500088 microDAQ Pressure Scanner Acquisition System INSTALLATION AND OPERATING MANUAL e mail info chell co uk Visit the Chell website at http www chell co uk 900165 1 1 Please read this manual carefully before using the instrument Use of this equipment in a manner not specified in this manual may impair the user s protection Chell Document No 900165 Issue 1 1 ECO 669 Date 20 March 2012 Chell s policy of continuously updating and improving products means that this manual may contain minor differences in specification components and circuit design from the actual instrument supplied Page 1 CONTENTS CONTENTS 1 enna 2 1 Desch piona a a aA EEA ee 3 ARE O E eerie ae A E 3 2 SPO CIFIC ATION aaa L LL E E 4 2 POWer SUPPIV ir ai A a aae 4 2 3 CAN Specific OS oia 4 24 Seralspecificat nS tees tes davies a nin abn iain aiden Ae aide 4 2 5 Ethernet SpecificatonS iii oie calle 4 2 6 Operating Conditions sii idos o a ea Ad 4 2 8 Measurement Specifications eiii at baena 4 3 Installation and Interconnections c0 essence 5 3 1 Connector Mating connector DEUTSCH AS606 O5SN HE uo cece ccee eee eeee entrees ete conn cnn 5 3 2 USB Connector Mating connector Micro Bo ceeeeceeeeee ee ete eter eee tee teste eae etae eerste eeneesneeeceeecaeenaes 52. 3 3 Scanner Connector Internal micro miniature D type feMale cece eee etee eens eteeeteeeeeeetteeeteeetaes 5 4 Operation of the instrument c ieee 6 4 1 Connecting Up he micrODAQs temita eed in e ti gti era 6 4 2 Installing the software ici pad 6 4 3 Re zeroing the MIGroDAQs ui jig ke ata di il oat el aps ee ad 6 4 4 Hardware Trigo 6 4 5 1 Hardware Trigger Inputincii aan ads naan dient winded athe aides 6 4 5 2 TIMING O Mii des 6 45 3 Software Control cnc aa a 7 5 microDAQ Setup Configuration Software c eee 8 5 LINTOCUCHON a eee ah alae A el es teeta hia A A ena Ade 8 5 2 The Setup Parameters Tabi titisea tintin pate hated jinn ig atadas 8 5 2 INMOCUCUON saab tations 8 5 2 2 gt Signal Parameters torrie Sane sala AA Sala ene ahaa Pe E i Bee Dt 8 5 23 GAN Pararmetersitaricasiiccs cideiisseesatees A ARA SADA Anand A bnpesdaacenauees NADAR Teis 10 5 2 4 TCP UDP Parametros a dlr A tamil A bine made 11 2 0 RS232 Parameters irc anda diodo 12 5 2 6 Remaining Sundry Parameters cnnncnnicnccnnncnnncnonnccnnnarnn rre rr 13 5247 The COM Framess cy ccdeg cetera A A AO A Ai 15 a LIVE Dalam Aveta dt a la ih ila A n 15 N Cal o dos 16 557 DTG LN A ine OP Dated ee RU AN 19 6 Service and Calibration 0 s eee 21 A eth nd leaves kh Geter rend det a RO E N E at cg bee dade capes 21 6 2 Call ii a ias 21 0 3 AQJUS Mets in A ARO a nei 21 6 4 Cleaning iaa 21 Page 2 1 Description 1 1 Ge
3. For calibration file management controls see the calibration section Table 5 2 Common setup control functions 5 2 3 CAN Parameters The optional CAN communication parameter controls are shown in figure 5 2 Options control the CAN bus baudrate the rate of data delivery the number of channels enabled and the data format Additionally the base message number may be selected as can the offset from this base number for the reception of user commands over CAN and whether an acknowledgement of these user commands is sent on the next higher message number Data may be transmitted on either multiple messages or alternatively on a single message ID with a selectable delay between messages SIGNAL w ms ewe Active CAN Channels All CAN First TX MessagelD Message Scheme delay CAN Data Rate Of Ox 1 0 0 Multiple messages y CAN Protocol CAN Baudrate Settings Defoe for 16 bit LE v CAN AX ID Offset 0x10 Ack Enabled ACK ID RX 1 0x10 Ack Enabled BRP TSEG1 TSEG2 SJw Baudrate 1 5 2 1 y Figure 5 2 CAN parameters within the setup data Page 10 CAN baudrate Shows the setting of the four register values required to set up the CAN bus timing in CANdaq s microcontroller Selecting a CAN baudrate from the combo box sets different register values to achieve one of a number of preset baudrates The user is free to set their own preference in consultation with the appropriate datasheet Note the
4. Signal group of parameters The function of the common controls is detailed in the subsequent table 5 2 2 Signal Parameters The microDAQ has settings to allow the user flexible control over the data throughput of the device Averaging options allow the preference of noise reduction over time domain response the frequency of calibration temperature compensation renewal may be chosen as may be the size of the average and hence time taken for the rezero routine Table 5 1 details the function of the signal parameter option controls Page 8 Control Function Pressure Input Impulse Filter Check box to apply impulse filter to pre calibration data will remove single impulse noise events in the pressure data Temperature Input Impulse Filter As above but with temperature data Pressure input average samples Selects the number of samples for a rolling average of pre calibration pressure data Temperature input average samples As above but with temperature data Pressure output average samples Selects the number of samples for a rolling average of post calibration pressure data Reset average on output Overrides the rolling pressure output filter When checked the unit builds a fresh post calibration average between each data delivery event Temperature Compensation Selects the temperature compensation scheme for the calibration Continuous repea
5. seen in figure 5 6 below Access to the communications port settings and the ping function of determining the current software version of the microDAQ is from this alternate frame The red indicator shows the software is connected to the serial port microDAQ Version 1 0 1 Firmware 1 0n COM 657600N8 1 _ Ping Compari sort 657600N 81 lt lt lt com f Figure 5 6 The alternate PING frame accessed from the COM button Ping CANdaq button To confirm that the attached microDAQ is alive and communicating clicking the ping button retrieves the current software version string from the device and displays it in the label next to the button COM port parameters The software defaults to the last used microDAQ serial port operating settings though these settings may be overwritten by typing the desired settings into the text box and clicking the gt gt gt button NOTE ensure the USB cable is connected to the microDAQ before clicking the gt gt gt button to connect and ALWAYS click the lt lt lt button to disconnect before disconnecting the USB cable from the microDAQ Table 5 7 Functions within the alternate PING frame accessed from the COM button 5 3 Live Data Figure 5 7 shows the Live Data tab of the software selected for a 64 channel pressure scanner microDAQ Setup V1 0 3 Setup Parameters Live Data Calibration DTC Information Tools m Live Data 1 0 0000 130
6. unit s function may be checked and demonstrated using Live Data to show attached pressure scanner raw readings and microDAQ s calibrated output Calibration gives access to microDAQ s existing on board non DTC calibration coefficients the tools for performing a new calibration namely calculating and downloading new coefficients and the means to managing calibration data Data from the calibration procedure and resulting coefficients may be loaded stored and exported for filing reuse and examination in other packages DTC Information provides a means for interrogating a DTC variant of the microDAQ the user having access to identification information the current status of the calibration shuttle valve and both excitation and temperature voltages Tools provides some functionality to read DTC coefficients and current scanner values and change the MAC address of the Ethernet hardware This tab is not readily available to everyone 5 2 The Setup Parameters Tab 5 2 1 Introduction The Setup Parameters tab allows the reading and writing of all of microDAQ s operating settings to its on board non volatile EEPROM The operator may upload the current settings from microDAQ edit them and then download them back into the unit A submenu of tabs divides the available setup parameters into different categories by function and each category is detailed separately in the following Figure 5 1 shows the common controls and the
7. 0000 2500000 370 0000 490 0000 610 0000 2 0 0000 140 0000 260 0000 380 0000 500 0000 620 0000 3 0 0000 1500000 2700000 390 0000 510 0000 630 0000 40 0000 160 0000 280 0000 4000000 520 0000 640 0000 5 0 0000 170 0000 290 0000 410 0000 530 0000 6 0 0000 180 0000 3000000 420 0000 540 0000 7 0 0000 190 0000 310 0000 430 0000 550 0000 ADC Volts 8 0 0000 2000000 3200000 440 0000 560 0000 C Binary 16b ADC 90 0000 210 0000 3300000 450 0000 570 0000 100 0000 220 0000 340 0000 460 0000 580 0000 110 0000 230 0000 3500000 470 0000 590 0000 120 0000 240 0000 360 0000 480 0000 600 0000 Derange Factor C Temperature Eng C Binary Pressure C Temperature 16b Temperature Reading Channel 1 0 M Log to Disk File Zero amp Full Scale RESET Rezero Rebuild Rebuild Wizard fe mk y Channels 64 7 COM A Figure 5 7 Contents of the Live Data Tab Page 15 The live data tab is a means to demonstrating the correct operation of microDAQ and testing the unit s calibration By selecting the correct number of channels for the attached scanner the software shows a data label dedicated to each The type of value shown in the label may be selected by means of the option buttons to the right of the frame the user selecting between raw decimal 16 bit unsigned calibrated decimal 16 bit unsigned and engineering units or voltage scaled to the known full scales Also for DTC scanners the temperature values as raw unsigned 16 bit
8. 5 255 25 Jo TCP Rate Ott Gateway 192 168 1 204 TCP Protocol 16 bit LE TCP IP connection set to listen on local port 101 Enable User Command Acknowledge V Figure 5 3a TCP UDP parameters Standard tab within the setup data Page 11 SIGNAL CAN TCP UDP Rs232 ETC mine A ET ococcocsccoseceecosesecoccecccoccecsccescesesesesoesesecsesees Primay DNS 192 168 1 200 ee a 0 Secondary DNS 192 168 1 205 Figure 5 3b TCP UDP parameters Advanced tab within the setup data SIGNAL CAN TCP UDP RS232 ETC Standard Advanced Use UDP E Auto Broadcast UDP message on boot port 10001 only if E Remote UDF IP address 1932 168 M 1 Me Remote IP not set if known Remote UDP port if known 10002 Figure 5 3c TCP UDP parameters UDP tab within the setup data IP Address IP address allocated to microDAQ on the user s network Subnet Subnet mask as set on the user s network Gateway IP address of the gateway on the user s network Active TCP channels Allows the selection of a subset of total scanner channels to be active TCP rate The delivery rate of data for each channel TCP protocol The data format delivered by the TCP module Can be 16 bit data as two bytes either big or little ended or engineering units Enable User Command If checked returns acknowledgement to incoming user TCP commands Acknowledgement Prim
9. A4 6 12VDC 7 12VDC 8 5VDC Vs 9 5VDC RTN 10 Ground 11 Output 12 Address line A5 13 Ov sense 14 Not used 15 Temperature signal Page 5 4 Operation of the instrument 4 1 Connecting up the microDAQ The microDAQ has one connector and cable which supplies the unit with power and also provides CAN and Ethernet comms An industry standard micro USB typeB connector is provided to allow for RS232 connection for changing the setup parameters of the Ensure all the connections are made before powering up the microDAQ Upon power up the blue LED will light constantly while the microDAQ boots up This boot up period will vary depending on the type of scanner and the number of channels The boot up time is also influenced by the Ethernet initialisation process This process requires a valid network connection to perform auto negotiation and link check status If there isn t a valid connection the process waits until either a network is found or the timeout occurs This timeout is configurable via setup and ranges from 0 to 30 secs per check 2 checks When the microDAQ has finished booting the blue LED will flash at a constant rate to show that the system is running 4 2 Installing the software The microDAQ interface software should now be installed so that the microDAQ may be configured Simply run the appropriate setup exe on the CD provided 4 3 Re zeroing the microDAQ Before any measurements are made the
10. DAQ will wait for the first pulse The time that this first pulse is generated can be measured by the user and therefore the time of the first set of data and all subsequent sets can be determined For more details on hardware trigger timing a technical paper is available Chell Page 6 document no 900118 this paper was developed for the CANdaq but applies to the microDAQ as well 4 5 3 Software Control The hardware trigger mode is activated by the T command over the RS232 CAN or Ethernet interfaces The T command can be used to enable the hardware trigger that will cause the microDAQ to stop free running and wait for the first pulse The disable command will return the microDAQ to free running The command structure is as follows Command Interface On Off TOO RS232 Off T10 RS232 On TO1 CAN Off T11 CAN On T02 Ethernet Off T12 Ethernet On Page 7 5 microDAQ Setup Configuration Software 5 1 Introduction microDAQSetup provides the means of setting up calibrating and demonstrating the microDAQ unit from a standard PC with a serial port Version 1 0 3 is written to complement microDAQ firmware V1 0 2 The software is divided by tabs into five areas of functionality namely Setup Parameters Live data Calibration DTC Information and Tools Setup Parameters provides the means to set microDAQ s operating parameters and its identification information The
11. FS 16 bit FS 16 bit FS 0 0 0 Temperature Cal Y mae Accept Defaults Calculate Clear ie Valine 7 x Save Test Load Test Exp Test Wiew Channel fi y Save As Open Export Zero amp Full Scale RESET Rezero Rebuild Rebuild Wizard az 5 y Channels 64 COM i Figure 5 8 Contents of the Calibration Tab Control Function Temperature tabs Select at which temperature the unit is currently been calibrated Applied Pressure The engineering units pressure setpoints user entered or set to standard values FS 0 5FS 0 by clicking Defaults Pressure 16 bit The 16 bit unsigned representation of the pressure setpoints calculated by the software Read value 14 bit The raw value read by microDAQ from the pressure scanner for the pressure setpoint Temperature 14 bit The temperature value read by microDAQ from the pressure scanner at that pressure setpoint Accept button Clicking Accept stores the current read value as the calibration point and moves on to the following setpoint Defaults Sets the default calibration points as full scale 0 5 full scale and zero Calculate Takes the acquired data and calculates the derived calibration coefficients will not proceed unless there is no more than one zero in the applied pressure text boxes Clear Clear the current calibration test data to zeroes also clears the calibra
12. alibration data table Page 13 If I daq detected use raw If checked this replaces the normal polynomial calibration function with a raw linear calibration function whenever an l daq is present in the microDAQ Sensistor in circuit If checked keeps the sensistor in circuit fora DTC scanner In normal operation this control should be left unchecked DTC gain 1 3 Selects the deranging function of the DTC scanner if the 3 option is selected otherwise defaults to the standard range of the scanner All DTC Channels Active If checked defaults microDAQ to setting the number of active channels to the number read from the DTC scanner header Span Calibration to DTC Full If checks defaults the span of the calibrated output to the full scale read from the Scale DTC scanner header Span High Sets the value of pressure for the high point in the linear span and zero calibration Valid values range from 0 144PSI 3 WC to 90PSI Scanner Type Sets the type of scanner installed into the microDAQ Conv DTC l Daq T DAQ Trig In line options Selects the use of the Trig In hardware line on the Autosport connector Table 5 6 Remaining ETC parameters within the setup data Page 14 5 2 7 The COM Frame The COM button towards the bottom right of the main from toggles the frame it sits in between the RESET frame as seen in figure 5 1 and the PING frame as
13. and calibrated engineering units may be displayed Once a type is selected clicking the Start button causes continuous reads of microDAQ until the stop button is pressed Clicking the Start button will cause most of the function buttons within the software to be disabled preventing their operation until the Stop button is pressed The Derange checkbox allows the application of a constant to the data in the case of the DTC deranging function being active the value of this constant may either be typed into the text box or reading the DTC header will automatically fill in this value The live data may be logged to a comma delimited file by checking the Log to Disk File checkbox Checking the file causes a new file to be opened in the current data directory with a filename of the form microDAQlive DDMMYY_n csv where DDMMY is the current date and n is a number incremented with each checking of the checkbox Each time a set of live values is read from microDAQ they are written in the current selected format to the disk file Unchecking the checkbox causes the current file to be closed The name of the last file generated is shown in the white text box on the form For non DTC scanners the temperature value read from the scanner is displayed in the Temperature Reading label 5 4 Calibration The Calibration tab allows access to microDAQ s existing non DTC calibration coefficients and provides a means to acquiring live calibratio
14. ary amp Secondary DNS Addresses of Primary and Secondary DNS servers not currently used on microDAQ Ethernet Initialisation Check At bootup the Ethernet module performs two checks for auto negotiation and link Timeouts check status This timeout can be controlled via this text box If Ethernet comms are not going to be used then this value can be set at 0 to speed up startup time Use UDP If checked uses the UDP protocol rather than the TCP protocol for Ethernet transmission Each packet is one cycle of data acquisition with 4 byte representation of microDAQ serial number at the start Remote UDP IP address and Address and port of remote connection to mic roDAQ If set then the microDAQ can port be set to auto stream data to that remote host on boot up after initialisation Auto Broadcast UDP message If checked auto broadcasts a UDP message on port 10001 on startup which details on boot the microDAQs serial number IP address etc in an ASCII comma separated list should not be used if remote UDP address port has been configured and auto streaming has been set via TCP rate on Standard tab Table 5 4 TCP parameter control functions 5 2 5 RS232 Parameters The data delivery options of CAN and TCP are repeated for the RS232 interface in addition to a baudrate selection allowing user configuration of microDAQ s baudrate on powerup The baudrate selected is valid for both data delivery functions and communic
15. ation checkbox can be ticked to apply a linear calibration function on boot up The DTC scanner s options of sensistor and gain configuration may also be selected from this tab All DTC Channels Active defaults the number of active channels to all on a DTC scanner overriding the number in the setup The Trig In line on the Autosport connector can be configured to be used for Hardware Trigger or Mute Rezero The scanner type should always be set to the type of scanner installed in the microDAQ to ensure proper operation of the system SIGNAL CAN TCP RS232 Scanner 32450 Scanner Type DTC Use DTC calibration if available v Serial No ie lr i Ensure correct scanner type f l daq detected use raw calibration J Unit f 205901 is set for scanner hardware to in Circi r Serial No built into microDAQ ensistor in Circuit All DTC Channels Active Iv Date 280212 Use Trig In line for ee j Span Calibration to DTC Full Scale Iv Span High 45 e HW Trigger psi E Mus Rezsto DTC Gain 1 DTC Gain 3 Figure 5 5 Remaining ETC parameters within the setup data Scanner ID Provision for a scanner serial number CANdagq ID Provision for the microDAQ serial number Date Provision for a date field the software defaults to the system build date Use DTC calibration if available On powerup uses the DTC scanners internal calibration coefficients to build the microDAQ s internal c
16. ation to the setup software Note that selecting Engineering Units for a protocol will cause the scanner addressing rate to be reduced itis better to scale calibrated 16 bit data to engineering units within the client software Page 12 SIGNAL CAN TCP As232 ETC R5232 Baudrate 57600 v Active A5232 Channels All v R5232 Protocol fi 6bitLE R5232 Data Rate Off v Enable User Command iv Acknowledgement Figure 5 4 RS232 parameters within the setup data RS232 baudrate microDAQ communication baudrate for both data streaming and user interface Active RS232 channels Allows the selection of a subset of total scanner channels to be active RS232 data rate The delivery rate of data for each channel RS232 protocol The data format delivered by the RS232 module Can be 16 or 14 bit data as two bytes either big or little ended or engineering units Enable User Command If checked returns acknowledgement to incoming user RS232 commands Acknowledgement Table 5 5 RS232 parameter control functions 5 2 6 Remaining Sundry Parameters The remaining parameters are edited via the ETC tab shown in figure 5 5 Scanner and microDAQ identification strings may be written as is to the device as may a date If the microDAQ is a DTC variant and DTC mode is to be used the Use DTC checkbox should be checked If the microDAQ is an l daq variant then the use raw calibr
17. croDAQ to those in the local memory ie those either newly calculated or copied from another microDAQ Send Burn Download the coefficients in the local memory to microDAQ and burn them into EEPROM Copy Remote Copy the coefficients over from the microDAQ memory to the local memory Clear Local Set all the local coefficients to zero Check Cal Compare the local and microDAQ calibrations held in memory and confirm if identical Set Span Set the span of the linear calibration confirms the value of pressure that has been set up as the span value is being applied to the sensor Reset Linear Cal Resets the linear calibration to 0 x1 ie no offset unity gain Applies ONLY to the current linear calibration ie the DTC calibration if using a DTC scanner 5 5 DTC Information Table 5 9 Calibration tab Action button functions The DTC Functions tab gives the user access to an amount of information regarding the attached DTC scanner The scanner voltages for temperature and excitation may be read and the position of the calibration shuttle valve determined as either being in RUN or CAL mode Also the information contained in the scanner header may be uploaded and displayed Note that the value of the parameter read from the scanner ie temperature excitation voltage and particularly valve position is valid only for the time that it is read To red
18. d controls are shown in figure 5 3a Options control microDAQs IP address and subnet mask in addition to any gateway IP address required Options for channels and delivery rate and protocol are the same as for the CAN system above microDAQ s active TCP listening portis fixed at 101 The Advanced tab figure 5 3b allows changing of the primary amp secondary DNS addresses not currently used by the microDAQ and also a setting for the Ethernet initialisation timeouts The UDP tab figure 5 3c holds all the settings specific to UDP In UDP mode each acquisition cycle of x number of channels is packed as a separate UDP packet with a four byte representation of the microDAQ serial number at the start of the packet These are attempted to be sent out at the required rate but with no checking for reception or validity of data The microDAQ s UDP port is also fixed at 101 Settings available from this tab include setting the UDP address and port for a remote connection for auto streaming via UDP at boot up and a setting for auto broadcasting a UDP message at bootup to inform the network of the availability of the microDAQ Note that selecting Engineering Units for a protocol will cause the scanner addressing rate to be reduced itis better to scale calibrated 16 bit data to engineering units within the client software SIGNAL CAN Fae Standard Advanced UDP IP ddress 192 168 1 192 Active TCP Channels all o Subnet 25
19. hown are the scanner model serial number and date of manufacture Header Gen Added for future enhancement Slow DTC comms Retained from CANdaq Mk3 for historical purposes not currently used Table 5 10 DTC Functions tab control functions Page 20 6 Service and Calibration 6 1 Service There are no user serviceable parts inside the instruments Should any difficulties be encountered in the use of the microDAQ it is recommended that you contact Chell Instruments Ltd for advice and instructions 6 2 Calibration Calibration is recommended on an annual basis and Chell Instruments Ltd Provides a fully traceable facility for this purpose 6 3 Adjustment There are no user adjustments in the instrument The user is strictly forbidden from removing the covers without invalidating Chell s obligations under both Warranty and COSSH 6 4 Cleaning A dirty instrument may be wiped clean with a soft cloth that has been sprayed with a proprietary foaming cleaner then wiped dry immediately A Under no circumstances should the instrument be wetted directly or left damp Page 21
20. internal CAN peripheral clock runs at 60Mhz All register values should be calculated based on that clock frequency CAN First TX Message ID microDAQ uses standard CAN message arbitration id s and the unit is assigned the most significant 2 digits of the Hex base address For the digits 0x1A for example data for the first 4 channels will be sent on 0x1A0 the next 4 on 0x1A1 etc Message scheme delay Select Multiple Messages for the 4 channels per message multiple message scheme Alternatively data may be packed 3 channels per message identifier byte with a selectable delay between messages Active CAN channels Allows the selection of a subset of total scanner channels to be active CAN data rate The delivery rate of data for each channel CAN protocol The data format delivered by the CAN module Can be 16 bit data as two bytes either big or little ended CAN RX ID Offset Selects the hex offset from the base message ID where microDAQ will receive incoming user commands see user command document If Ack Enabled is selected the unit will acknowledge the reception of a correctly formatted command on the message ID calculated as Base ID RX Offset 1 BRP TSEG1 TSEG2 SJW Register values for the CAN module within microDAQs microcontroller Table 5 3 CAN parameter control functions 5 2 4 TCP UDP Parameters The optional TCP UDP communication parameters Standar
21. luding software version setup parameter values and identification Diagnostic information may be seen in the central listbox Burn Settings button Downloads setup values and identification strings to microDAQ then writes them into the EEPROM Diagnostic information may be seen in the central listbox Rezero button Starts a microDAQ rezero operation RESET button Resets the microDAQ similar to power cycling the device Use to activate new settings and or rebuild calibration tables Channels dropdown The number of channels on the attached scanner should be chosen from the Channels drop down It is important that this number is correct when performing any calibration or reading data from microDAQ Full Scale dropdown This dropdown is the only means of selection of the scanner s full scale operating pressure The value affects the display of live engineering values and the generation of calibration coefficients Wizard button Start the setup wizard for a simple way to apply common settings to the microDAQ Rebuild button Force a calibration table rebuild Start Capt button Start capturing characters received on the serial port to the text file and display on the engineering screen Stop Capt button Stop capture of serial characters Engineering Functions Show or hide the engineering functions panel checkbox
22. microDAQ should be re zeroed The microDAQ may need further re zeroing if the unit or scanner should be subject to significant thermal variations The microDAQ is re zeroed by sending the appropriate command over the CAN USB or Ethernet link via the Chell software The system will then average a number of zero readings and perform a re zero Naturally there should be no pressure applied to the ports of the scanner when a re zero is being performed When a re zero is being performed the red LED will light momentarily 4 4 Hardware Trigger The microDAQ features a hardware trigger to enable the user to synchronise multiple microDAQ s and to calculate the timing of the measurements made The hardware trigger takes the form ofa pulse train Each time the microDAQ receives a positive edge it will generate a set of measurements for all the channels configured in the system 4 5 1 Hardware Trigger Input The hardware trigger input is a 5V TTL square wave pulse train Minimum frequency 2Hz and maximum frequency 1KHz 16 channels only 4 5 2 Timing Information The hardware trigger allows the user to calculate the time of each measurement For example if the hardware trigger were running at 100Hz then the user would receive 100 measurements per channel per second The first pulse would generate the first set of measurements and 10ms later the second pulse would generate the second set and so on When the hardware trigger is activated the micro
23. n data and calculating new coefficients The loading saving and export of both tests and coefficients is also possible from this tab Calibrations may either be 3 temperature based for a temperature calibration or by unchecking the Temperature Cal checkbox a non temperature calibration may be performed at a single temperature Figure 5 8 shows the Calibration tab controls which are further explained in table 5 8 The software maintains two sets of coefficients those uploaded from microDAQ and a local set which is either loaded from the file of a previous calibration or calculated from live or reloaded test data Either of the two sets may be examined by choosing which is viewed via the Remote or Local tab and selecting the channel from the dropdown box The compare button may be used to compare the local set with the microDAQ upload set to confirm a successful burning of new coefficients Other controls include the Send and Burn button which writes the current local coefficients to microDAQ EEPROM The Clear button sets all local coefficients to zero The Actions buttons may be seen in figure 5 9 Page 16 microDAQ Setup V1 0 3 Setup Parameters Coefficients Live Data E i DTC Information Tools Remote Local Actions Temperature 1 Temperature 2 Temperature 3 co C1 C2 C3 C4 C5 C6 C7 C8 Calibration File AppliedPressure Pressure Read Value Temperature Eng Units 16 bit
24. neral The microDAQ is a self contained acquisition system and combined pressure scanner that acquires and transmits data to a host via USB Ethernet or a CAN bus It is the next generation of the popular Chell CANdaq acquisition system The microDAQ comes in several variants to accommodate both conventional HD series scanners and Digital Thermal Compensation DTC scanners with 16 32 and 64 channels The microDAQ is supplied with all the software required to configure it and read the data from it The microDAQ addresses the scanner at a defined rate acquires the output and applies a pressure and thermal calibration to derive the engineering units The microDAQ can be re zeroed at any time either from a host controller via comms or by closing contacts between two pins on the Autosport connector if configured in this mode The microDAQ also has a hardware trigger like the Mk3 CANdaq system to give some time determination to the data acquired This manual covers firmware version 1 0 2 Page 3 2 Specification 2 1 Power Supply Line voltage Consumption CANdaq only With a 64 channel scanner 2 3 CAN specifications CAN type CAN baudrate Programmable variables Address 0x nn Address 0xn n BRP TSEG1 TSEG2 SJ W 2 4 Serial specifications USB2 0 micro 2 5 Ethernet Specifications TCP IP 2 6 Operating conditions Operating temperature range Storage temperature range Maximum Relative humidity 2 8 Measu
25. on Send and Burn Download all local coefficients to microDAQ then write them all to its EEPROM Copy CANdaq Copy the current set of microDAQ coefficients to the local memory allows storing of calibrations from a microDAQ or copying a calibration from one unit to another without recourse to original files of either calibration data or coefficients Channel Select the channel to view its local calibration coefficients Clear Set local coefficients to zero and clear the coefficient text boxes Calibration Load Save Calibration file Shows the path and filename of a calibration file if loaded Open Load a file of coefficients from a previous calibration defaults to the calibration file directory Save As Save the current local calibration coefficients to a file defaults to the calibration file directory Export Export the current local calibration coefficients to a comma delimited text file defaults to the current data directory Table 5 8 Calibration Tab Control Functions Coefficients Remote Local Read Remote Compare to Local Send Burn Copy Remote Clear Local Check Cal Set Span GE Reset Linear Cal Figure 5 9 Calibration tab Action buttons Page 18 Control Function Read Remote Upload the calibration coefficients currently stored in microDAQ to the software Compare to Local Compare the values of coefficients uploaded from mi
26. rement specifications System accuracy Resolution Maximum Measurement Speed 9 36 VDC Max 15VA 2 0B Configurable by internal switch from 1M 500K 125K and 100K Most significant programmable device ID Next most significant programmable device ID CAN bus timing see Infineon data sheet CAN bus timing see Infineon data sheet CAN bus timing see Infineon data sheet CAN bus timing see Infineon data sheet 57600 baud no parity 8 data bits and 1 stop bit 10Mb s amp 100Mb s via Auto Negotiation TCP amp UDP protocols supported 5 C to 50 C 40 F to 122 F 20 C to 70 C 40 F to 158 F 95 at 50 C non condensing 0 25 FS for conventional scanners 0 06 FS for DTC scanners 0 06 FS for I Daq scanners 16 Bit See table below Number of Scanner channels Acquired 16 32 48 64 Speed M C S 1250 625 400 300 All measurements are in measurements channel second Page 4 3 Installation and Interconnections 3 1 Connector Mating connector DEUTSCH AS606 05SN HE PinNumber Designation 2 3 2 USB Connector Mating connector Micro B Pin Number Designation 5v USB transceiver supply USBDM CA 3 3 Scanner Connector Internal micro miniature D type female Pin number Signal 1 Address line AO 2 Address line Al 3 Address line A2 4 Address line A3 5 Address line
27. tedly rebuilds the calibration data on a channel by channel basis without interrupting the flow of data Demand only permits the use of a designated user command to request a rezero Periodic and the selected Compensation Period force a compensation operation at designated intervals Rezero average samples The number of samples in the average to calculate a new pressure zero offset Rezero Tracking Band Set the region or FS from zero where the unit tracks the output to zero after a rezero operation Select Off to disable the function Table 5 1 Function of the Signal parameter controls microDAQ Setup V1 0 3 Live Data Calibration DTC Information Tools SIGNAL CAN TCP UDP Rs232 ETC Pressure Input Impulse Filter Temperature Input Impulse Filter Pressure Input Average Samples Iv Pressure Output Average Samples Y Temperature Compensation vv No Rezero Samples Temperature Input Average Samples f 6 v Start Capt Engineerin Stop Capt Vv Functions i Connect Read Int EE ER ADC 2 s a Burn Settings Zero amp Full Scale RESET Rezero Rebuild Rebuild Wizard far y Channels 132 COM Figure 5 1 Contents of the Setup Parameters tab Signal Tab and Engineering Functions Selected Page 9 Control Function Common Functions Connect and Read button Retrieves all setup data from microDAQ inc
28. tion controls Save Test Save the current calibration test data to a file defaults to the current data directory Load Test Load the test data from a previous calibration defaults to the current data directory Exp Test Export the current calibration test data to a comma delimited text file Temperature Cal When checked enables temperature tabs 2 and 3 for a 3 temperature calibration Unchecked only temperature tab 1 is available to the user and the software will calculated coefficients for a non temperature calibration Page 17 Live Values Unchecked the live values from microDAQ are inhibited from overwriting existing values in the calibration controls Use when loading a previous test for examination or recalculation of coefficients View channel Select the channel that supplies the values displayed in the calibration controls Remote Coefficients CO C3 Calibration coefficients uploaded from microDAQ for the selected channel Read Remote Upload and read the current calibration coefficients from a connected remote device microDAQ Compare to Local Compares the current set of microDAQ coefficients with those last calculated or loaded to local memory and provides a result of identical or not Channel Select the channel to view its current calibration coefficients Local Coefficients CO C3 Calibration coefficients last calculated from a calibration test or loaded from a previous calibrati
29. uce the likelihood of a misleading reading being displayed the displays are cleared after a number of seconds microDAQ Setup V1 0 3 Setup Parameters DTC Scanner Information Range Header x Live Data Calibration x3 Derange Channels Header Gen Gen 7 Slow DTC comms F Read Read Current Scanner Status Temperature Value Volts Excitation Yotage V Calibration Valve Position Click a button to read the current status of the parameter Display will be blanked after a short pause Zero amp Full Scale RESET Rezero Rebuid Rebuild Wizard far 5 y Channels 64 7 COM A Figure 5 10 DTC Information tab Page 19 Control Function Temperature V Click gt gt gt to read the current temperature voltage from the scanner Excitation V Click gt gt gt to read the current excitation voltage from the scanner Calibration Valve Position Click gt gt gt to read the valve position as RUN or CAL Range Shows the floating point value for the range contained within the scanner x3 derange Shows the floating point value for the sensitivity derange constant contained within the scanner Channels Shows the floating point value for number of scanner channels Read Uploads the data header from the DTC scanner splits out the information and displays scanner full scale the number of channels and the deranging factor Also s
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