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Watt Pilot Manual

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1. About This will show software version and contact information Please include software version and controller serial number when contacting manufacturer 4 7 Program preferences description Preferences window can be accessed by Options gt Preferences menu item in Watt Pilot control window Pe GATT101D preferences In gt Rotate continuous Home postio HAMME Ged W Automatically execute GO after required power change zj Automatically cxocube GO afkor slider change FF Use absolute powe measurement units Measurement units bo use m n Minimun measured value 0 10 ma Maximum measured value 10 00 po M Use absolute measurement units tor preset buttons Cancel Ok Figure 12 Program preferences window Can be found under menu Options gt Preferences Rotate continuous If checked waveplate can be rotated continuously using lt lt or gt gt buttons in control window This will cause attenuation to change from min to max 8 times in 360 degrees turn This option can be useful to check if current waveplate calibration is set for best contrast ratio possible For example best contrast can be get if using second or third 45 degree slot For this option to appear controller firmware must be updated to latest This option is not available for controllers with serial numbers beginning with 4ATT Home position Power can be set to max or min
2. Figure 38 Error thrown if device firmware becomes corrupted gt Read further 39 In order to recover follow these steps 1 Close Watt Pilot software 2 Turn off controller using ON OFF switch 3 Press and hold down Firmware upgrade button located inside controller box see Figure 37 or Jage 39 to find there it is 4 Turn on controller while holding firmware upgrade button pressed 5 Release button after 10 second after power on 6 Launch Watt Pilot software and try to use the device 7 Firmware will be correctly rewritten automatically Device will be ready to use after one minute 9 List of Tables Table 1 Controller specifications 18 Table 2 STEP DIR INTERFACE connector pin out 21 Table 3 STEP DIR INTERFACE connector electrical specifications 21 Table 4 MOTOR connector pin out 25 Table 5 Stepper motor ST2818S1006 electrical characteristics 26 Table 6 Serial port parameters 26 Table 7 Serial commands list 28 Tel 370 527 25 738 Paxt3 1052 23 101 sales altechna com Mokslininky st 6A Vilnius Lithuania www altechna com
3. as steps cos yratio 43 333 2 where ratio is required transmission 0 0 1 0 43 333 is step per degree for standard attenuator and 2 is default resolution multiplier Usually arccosine function acos found in programming packages operates with radians so degrees must be converted to radians Real relation between ratio and steps used in Watt Pilot software is calculated using following CH methods Returns step position to be passed to g steps command ratio double in range 0 0 to 1 0 publicint32 GetStepPositionFromRatio double ratio i return GetStepPositionFromDegrees GetAngleFromRati o ratio stepsPerUnit 43 333 for standard attenuator or 100 0d for Big aperture attenuator resolution 1 0d 2 0d 4 0d 8 0d 16 0d depending on controller settings publiclnt32 GetStepPositionFromDegrees double degrees i double steps degrees stepsPerUnit resolution return Int32 steps converts ratio 0 0 1 0 to waveplate angle in degrees ratio double in range 0 0 to 1 0 publicdouble GetAngleFromRatio double ratio i double angle Math Acos Math Sart ratio 180 0 2 0 Math Pl return angle Angular offset between waveplate and waveplate rotator is important so degrees parameter in GetS tepPositionFromDegrees double degrees should be adjusted accordingly to offset before passing 35 7 Wa
4. A 4 Com Yellow Leave unconnected A 3 B il Com White Leave unconnected BY 2 Figure 24 Using unipolar motor as bipolar gt Read further 25 External 5 W power supply Table 5 Stepper motor ST2818S1006 electrical characteristics Winding voltage 2 66 V Winding Current 0 95A Winding Resistance 2 80 Resistance of motor windings usually is less than 10 Ohms so wires to the motor must be as short as possible and with significant wire diameter gt 0 75 mm or lt 20 AWG to minimize wiring impact to motor noise 5 9 Watt Pilot controller connection examples and input circuit diagram Connect pins 5 and 13 to activate Step Dir mode za Controller internal circultry 5W digital Inputs outputs custom ouiin j Electronics oupa acon H Fa ty board ove se fase mnm eee SBE EZ SSE SEBS SES TTE Swe Figure 25 Connecting external equipment to use Watt Pilot controller in Step Dir mode Pull Upfor zero position tSv internal 151 j Weak pull ups Gare ix 10k aT Uan 7 Oc Je je Internal circuitry Step Dir connector Watt Pilot controller Figure 26 Connecting Watt Pilot controller to microcontroller employing all of Watt pilot features 6 Writing Software for Watt Pilot 6 1 List of Supported operating systems for USB drivers In order to communicate with Watt Pilot USB drivers are necessary These are available for more
5. A graphical serial terminal like minicom It is aimed mainly at hardware developers or other people who need a terminal to talk to their devices It is free software and distributed under the GNU General Public License Version 2 which can find in the file COPYING Cutecom is heavily inspired by Bray for Windows HH He HHH a HH He Package cutecomn 0 2 0 1486 las txz installed root Aivaras home Aivaras cutecnm No protocol specified cutecom cannot connect to X server 0 root Aivaras home Alvaras dmesg grep cp210x 515 118805 USB Serial support registered for cp210x 515 118847 cp216x 5 1 1 8 cp210x converter detected 515 355645 usb 5 1 cp216x converter now attached to ttyUSB0 515 355685 usbcore regislered new inlerface driver cp210x 515 355691 cp210x vO 09 Silicon Labs CP210x RS232 serial adaptor driver 1196 500459 cp2l0x ttyUSBO cp210x converter now disconnected from ttyUSBO 1196 500493 cp210x 5 1 1 0 device disconnected 1202 112587 Cp210x 5 1 1 0 cp210x converter detected usb 5 1 cp2l0x converter now attached ta ttyUSBO rooteAlvaras home Alvaras Figure 28 Finding Watt Pilot serial port under Linux Screenshot is taken on Slackware Linux 13 37 32 bit OS In the picture above we can see that one Watt Pilot cp210x device is assigned to ttyUSBO port There is also shown installation command for CuteCom package which is easy to use terminal application with GUI 6 4 S
6. Do you want to download and install Microsoft Met framework 140 Chant profile download size s 42 MBJ 4 Click Next CE Bs Wall Pika 7010 Selop 7 Setup will download Microsoft NET Framework 4 Client Profile Program changes from previous versions can be seen here Log ved 1 0 2013 09 13 Pa Wall Pilko 7 0 1 0 5Sebap Updated user manual WATT PILOT Marwal September 4113 pdf Updated firmvrare fv 13 Installing Added numeric power meter display in main window a nku Lite e nn j S added Enea and RCEF undue Please wail while Walt Pilot 2 0 1 0 is being installed Added calbration settings backup and restore support added Status collumn in Watt Pilot Selector ket Added option to automaticaly execute GO command after required power change Downloading dothET4 ene hehe Home bulion in men wirtclow Added email message generation for quick feedback Chick on scrollbar arrows or press Page Down to review the entire text Nuleott install System v2 46 2246kA 5 of 41992K8 al 748 ABS 53 seconds remaining lt Back Ment gt Cancel EX 5 Select installation directory and click Next to begin Nullsoft Inetalltrctbem v2 46 installation Bs Wall Pika 7010 Sebu Choose naal Location P m Choose the folder in which to install Watt Pilot 2 0 1 0 S 8 After download is finished Microsoft NET Framework 4 Client Profile will be
7. OFF switch it must be in ON position Green LED near power switch must be active if power is OK Click File gt Search For Devices to refresh For more information about Watt Pilot Selector window see section Watt Pilot Selector window on page 11 Select Watt Pilot from a list and click File gt Connect Program will update controller firmware if necessary Usually this process is automatic and does not require any action just wait until Firmware upgrade was successful message appears If problems arise with firmware update see Firmware update on page 17 and TROUBLESHOOTING on page 38 Once connected to Watt Pilot dialog will popup informing that no calibration file is found for new attenuator Settings file not found Please calibrate waveplate offset before using attenuator Do you want to calibrate it now Figure 4 Dialog box shown if Watt Pilot calibration file is not found Select Yes calibration window will appear Use instructions in section Calibration on page 12 to setup calibration After calibration is done Watt Pilot control window will appear Use slider to select and set required power See section Watt Pilot Contro window window on page 13 if more information is needed 10 4 4 Watt Pilot Selector window Watt Pilot Selector window contains a list of currently connected and powered attenuators This win
8. Stav on Top 3600 Rece Stream bag custom BR Rx Clear ASCII table Scripti i j Graph Remote C RATSACTS x0NASOFF C RATS on TX invert cis CD DSR ERI 3 f HEX O Dee Bin CLEAR M Autoscroll Reset Cnt 3 Cnt 1 ASCII StartLog StopLog Req Resp ale M E 1 a 432 d 232 5500 ra lld ws 36 we ll4 r enil zr 0 zs 0 6 T rare CLEAR Send File fo z T CR CA LF BREAK Mame Set Macros Stop M2 M3 M4 M5 HE M7 M8 M3 MIO Mil Mi2 M13 M14 M15 Mig M17 MiSs M19 M20 M MZ M23 M Figure 29 terminal exe window with p command sent Presets can be configured for frequently used commands Click Set Macros button Macro Settings window will appear Macro Settings Figure 30 Command string presets can be configured by clicking Set Macros button in main terminal exe window Type in string which should be sent and name of this preset Hexadecimal values can be entered with S prefix For example command end symbol Yr 0x0D should be entered as SOD Stop command definition is Shown in example Click Save button to save your presets Stop button will appear in Macros pane of main window Press it to stop attenuator motor motion 6 6 Serial command usage with National Instruments LabV
9. Values in lower numeric fields will alter according to slider position There is a triangle shaped marker above lower slider which shows power currently set in real time the same as power meter panel displays Both options Automatically execute GO after must be selected in Options gt Preferences if power should be set immediately after slider move Otherwise click GO button to actually set power Enter required value field is used to manually enter percentage of Watt Pilot transmission Decimal point symbol is dot two decimal places can be used Valid range is 0 00 100 00 Option Automatically execute GO after required power change must be selected in Options gt Preferences if waveplate should rotate automatically after value of this field is changed Otherwise click GO button to actually set power Absolute required power field is available if Use absolute power measurement units option is set in Options gt Preferences or Options gt Calibration Decimal point symbol is dot Valid range is from Minimum measured value to Maximum measured value set in program preferences Option Automatically execute GO after required power change must be selected in Options gt Preferences if waveplate should rotate automatically after value of this field is changed Otherwise click GO button to a
10. degrees at highest attenuation point and 0 degrees at zero attenuation The purpose of calibration is to obtain angular offset between A 2 waveplate and rotator hardware zero position when one of these two conditions is met Calibration window is opened automatically on first use of Watt Pilot or can be found in menu Options gt Calibration in Watt Pilot control window Make sure that attenuator is correctly aligned before calibrating Pe GATT1010 calibration Step 1 Drive waveplate rotator to home limit switch G Rolale waveolate by using buttons below pls dava data Rok onoho Search for lowesl or highest power Go lo Step 4 when such posilion is found lt so wo of a sf oj m soo gt Current wavepilate rotator positon ie 1800 steps 20 769 deg stop Mirina messued wale 0 00 mii Meimum measured value TUUU mW Figure 6 Calibration window Calibration procedure 1 Click GO button in section Step 1 and wait till motor stops This will drive waveplate holder to hardware zero limit switch This will allow accurate homing from control window Homing is needed after power loss during motion and will eliminate any accumulated position error 2 Check checkbox in Step 2 if using Big aperture waveplate rotator See pictures below Standard rotator Step 2 checkbox must be unchecked Big aperture rotator Step 2 checkbox must be che
11. delays between commands must be inserted Parameter x Otherwise command misinterpretation can occur See cw Dir pin is disconnected motor direction table below for command list is clockwise cew Dir pin is disconnected motor direction is counterclockwise off motor direction is controlled by signals on Dir input pin in DB 15 connector Example dir ccw set motor direction counterclockwise Now send ss to save this setting to controller mx Move motor by x steps Parameter x Integer number Can be positive motor turns clockwise and negative motor turns counterclockwise Place for negative notation x can be in range of 2 147 483 646 2 147483646 Example m 1000 to move 1000 steps clockwise and m 1000 to move 1000 steps counterclockwise gt Read further 28 Go to absolute coordinate rx Parameter x Integer number Can be positive and negative Place for negative notation x can be in range of 2 147 483 646 2 147 483 646 Example g 400 motor turns while internal step counter reaches 400 Then send m 1000 to move 1000 steps clockwise Now motor stands in 600 position Set coordinate counter to specific value Parameter x Integer number Can be positive and negative Place for negative notation x can be in range of 2 147 483 646 2 147 483 646 Example 625 set coordinate to 625 Now send
12. installed wait for Setup will install Watt Pot 2 0 LO in the allowing holder To install in a ditterent fodder dick Browse and select another folder Click Install to start the installation it to complete This can take more than 10 minutes on slower machine Ey Pi nasalt NET Pree wrk cd Clieot Profile Set og Instalati Poa hack wide Gs NET Framework is being installed fw MET Nulsoft install Systeam 5 Back imal Cancel Fila security vector ea ABER Eee Ree Oe EL All files were verified successfully Installation progress i Instaling NET Framework 4 Client Profile Lance gt Read further 9 Setup will finish by installing drivers Click Next to continue Ps Wall Pika 220 10 Setup Selup was completed successfully S Output tolder C Program FiesWbechna Watt Pitot Creating schor teuls Create folder C Documents and Settings Al Users Start Menu Programs Altechnal Create folder C Documents and Settings l Users Application Data techna Watt Create shortout C Documents and Settings All Users Stert Menu Programs Altechn Create shortcut C Documents and Settings Veers Start Menu Programe ltechn Create shortoul Documents and Setlings Al Users Desktop Wall Pio Ink Output tolder C Program Fies ltechnalV att Pilot Create shortout C Onrumente and Settings Al Users Start Menu Programs altechin Create shortcut C Decunents and Settings All Users Gtart Menu P
13. is disconnected if 0 This setting is meaningful if parameter 1 is On 3 Boolean 1 or 0 Status of switch SW F see Figure 18 1 means that Dir pin is disconnected and motor turns clockwise if 4 parameter is 1 or counterclockwise if 4 is equal to 0 If 3 is 0 then motor direction is dependent on logic level on Dir input 4 Boolean 1 or 0 Motor direction motor turns clockwise if 4 parameter is 1 or counterclockwise if 4 is equal to 0 This setting is meaningful if parameter 3 is On 5 Reserved 6 Reserved 7 Reserved Response example default controller settings swEn 0 en 1 swDir 0 dir 1 zr 0 zs 0 cs 0 Show all controller settings separated by semicolon Use this command when programming computer software to read all settings Return string finished with Ox0A and 0x0D symbols ZAS LS A LOL 2 141 15 16 17 18 19 20 211 22 23 24 Character meaning 1 Boolean 1 or 0 Current operating mode Command mode if 1 and Step Dir mode if 0 2 Integer 0 1 2 or 3 Current motor run state 0 motor is stopped 1 accelerating 2 decelerating 3 running at constant speed 3 Integer from 0 to 255 Acceleration value 4 Integer from 0 to 255 Deceleration value 5 Integer from 1 to 65500 Speed value 6 Integer from 0 to 255 Motor motion current value 0 00835x A 7 Integer from 0 to 255 Motor idle current value 0 0083
14. mode and only via USB connection It will not work if RS232 level shifter is used Attention UART pins are connected directly to controller s microprocessor which is 5 V device RS232 to 5 V UART converter must be used to connect device to PC for example MAX232 chip can be used for this 5 5 Operation modes Step Dir mode This is the second of two possible controller operation modes Step Dir mode is selected by connectingpin 5 ModeSel to pins 13 GND in STEP DIR INTERFACE connector USB connection and computer are not necessary in this mode Motor rotates according toelectric signals applied to STEP DIR INTERFACE connector These signals are called STEP pins 1 9 DIR pins 2 10 and ENABLE pins 3 11 DIR signal sets rotation direction of the motor 0 V motor rotates counterclockwise 5V motor turns clockwise Voltage transitions from 0 V to 5 Von STEP input advances motor per one step 5 Von ENABLE pin will reduce motor current to Standby current value set in settings and STEP signal is ignored Otherwise Motion current flows to motor and STEP pulses rotate the motor Use ENABLE input to reduce motor heating More details can be found in STEP DIR INTERFACE connector pin out and specifications on page 21 Attention Motor current is set by ENABLE signal so leaving it high can overheat the motor s
15. so Set motor micro stepping resolution Parameter x 1 Motor is driven in full steps mode Waveplate holder turns once in 15600 steps for standard attenuator or 36000 for big aperture 2 Half step mode Waveplate holder turns once in 31200 steps 4 Quarter step mode Waveplate holder turns once in 62400 steps 8 Eight step mode Waveplate holder turns once in 124800 steps 6 Sixteen step mode Waveplate holder turns once in 249600 steps Higher micro stepping levels demonstrate better position accuracy and no motor resonance It is advisable to use half stepping operation mode to save position to controller WS X Resets coordinate counter to 0 st Stop motor smoothly if it is currently running This is preferred command to stop motor instead of b Set motor current then it is idles This removes motor heat Some amount of current must be left in order to keep position accuracy Parameter x Integer number in range of from 0 to 255 Motor current can be calculated using such equation 0 00835x A Bake movement immediately This command stops motor but step counter wm x accuracy can degrade using watt pilot zp Go to hardware zero position and reset step counter Set motor current then it moves Parameter x Integer number in range of from 0 to 255 Motor current can be calculated using such equation 0 00835x A Use this command to return waveplate to its
16. used in the same system Name length can be up to 20 characters and is saved into controller memory Serial number is unique for each Watt Pilot controller and cannot be changed as it is used to identify hardware at low level Please include serial number if contacting developers Power meter panel always shows existing power after the attenuator Percentage range is trom 0 to 100 of transmission Zero percent means that waveplate occurs at 45 degrees angle beam polarization is rotated by 90 degrees and is maximally attenuated Display reading 100 means that waveplate is rotated at minimum attenuation maximum transmission angle 50 0 MW 50 0 5 05 mw Figure 9 Power meter panel Left Use absolute power measurement units checkbox is set in Options gt Preferences right checkbox is unset If Use absolute power measurement units checkbox is set in Options gt Preferences or during calibrating numeric display showing mW becomes active Absolute power reading is converted from percentage value with respect to minimal and maximal measured power using power meter Correct min and max power values must be set in program preferences or calibration windows 1 Watt Pilot name and serial number Output power level is always shown as percentage because it is directly related to waveplate angle Power also can be shown with absolute measurem
17. zero position switch state Phototransistor is open low resistance state if pin 7 in MOTOR connector is 0 V and closed high resistance if pin 7 is 5V logic high 6ATT controllers come with attenuator which optical sensor output is normally high and 0 V if rotator is in zero position Pin 7 is CMOS input with absolute maximum voltage rating 5 5 V MOTOR connector D SUB 9 Female Watt Pilot g 5 Optical sensor controller 1 Sensor output Normally 5W OV in zero positior Figure 21 Zero position input circuit diagram for controllers with serial numbers starting with 6ATT Only mechanical limit switch can be attached to 4ATT or SATT controllers because input circuit is different from 6ATT controllers it is shown in the picture below MOTOR connector D 5SUB9 Female Wiican Reet S N 9 Watt Pilot 5 i intern i controller Zero position switch pin 7 connected to GNE in SATT controllers Not connected in 4ATT nee K a Figure 22 Zero position input circuit diagram for controllers with serial numbers starting with 4ATT and SATT Read further 23 Warning GATT controllers support every Watt Pilot attenuator but 6ATT attenuator cannot be driven by 4ATT or SATT controller Note Because of mechanical zero position switch zero position optocoupler signal should be debounced or used only first vol
18. 5x A 8 Integer from 0 to 255 Motor current value in Step Dir mode 0 00835x A 9 Integer 1 2 4 8 or 6 Micro stepping resolution value full hal guarter eight or sixteen 10 Boolean 1 or 0 Motor enable motor is enabled if 1 and motor is disconnected if O 11 Reserved 12 Boolean 1 or 0 Whether to reset position counter on each zero position switch press or no If this option is disabled 0 zero position button press does nothing to step counter If waveplate holder turned twice command o willshow us that position is more than 15600 15600 is full waveplate turn in full stepping mode If this position is enabled 1 position counter will become 0 on each zero position switch press Read further 31 13 Boolean 1 or 0 Whether to report o coordinate then hitting zero position switch if 1 or do not report if 0 If this option is on 1 controller sends string zp integer_position on each zero position button press 14 Reserved 15 Reserved 16 Reserved 17 Boolean 1 or 0 Motor direction setting in Step Dir mode motor turns clockwise if 17 parameter is 1 or counterclockwise if 17 is equal to 0 This setting is meaningful if parameter 20 is On 18 Boolean 1 or 0 Motor enablesetting in Step Dir mode motor is enabled if 1 and motor is disconnected if 0 This setting is meaningful if parameter 1 is On 19 Reserved Return running
19. Watt Pilot Motorized Attenuator User Manual Altechna Table of Contents Watt Pilot 4 1 Introduction 5 1 1 Watt Pilot short description 5 1 2 General safety requirements 5 1 3 Symbols 5 1 4 Regulation 5 1 5 Operating and storage conditions 6 2 Operation Principle 6 3 Packaging contents 7 3 1 Watt Pilot Main Components 7 3 2 Optics assembling 8 4 Watt Pilot Software Description 8 4 1 Computer requirements 8 4 2 Software installation 8 4 3 Program first run 10 4 4 Watt Pilot Selector window 11 4 5 Calibration 12 4 6 Watt Pilot Control window 13 4 7 Program preferences description 15 4 8 Motor settings description 16 4 9 Firmware update 17 5 Watt Pilot Controller Hardware 18 5 1 Controller specifications 18 5 2 Controller connections 18 5 3 Controller internal block diagram 19 5 4 Operation modes Command mode 20 5 5 Operation modes Step Dir mode 20 5 6 STEP DIR INTERFACE connector pin out and specifications 21 5 7 MOTOR connector pin out 24 gt Read further 2 5 8 Supported Stepper Motors 25 5 9 Watt Pilot controller connection examples and input circuit diagram 26 6 Writing Software for Watt Pilot 26 6 1 List of supported operating systems for USB drivers 26 6 2 Serial port parameters 26 6 3 Identifying serial port name 27 6 4 Serial commands and protocol 27 6 5 Software recommenda
20. cked Figure 7 Standard and Big aperture waveplate rotators 3 Rotate waveplate by using buttons in section Step 3 and measure laser power after the attenuator Number on the buttons represents motor moving distance measured in stepper motor steps and rotation direction One step equals to 0 0115 degrees for standard waveplate rotator and 0 005 degrees for big aperture attenuator using default settings Itis advisable to search for lowest power max attenuation position because usually it can be spotted more easily and accurately Power meter is not necessary for relative coarse power attenuation min power can be found using visualizer 4 Select appropriate option in Step 4 when minimum or maximum power is found Angular offset is recalculated and shown in Step 7 field every time Step 4 selection is clicked At this moment main calibration goal is completed and Apply button can be clicked to apply changes Further steps are optional but can be set for convenience 5 Calibration result can be verified using buttons in Step 5 panel Usage example click Drive to minimum power button and wait till rotator stops Use buttons 10 and 10 located in Step 2 to ensure if current position is really of lowest power If it is click Apply else select Minimum power in Step 4 again to redefine offset The same can be done with maximum power point Check
21. controller has firmware version prior to v8 released on August 22 2012 These dialogs will newer show up againonce firmware is updated Warning Upgrade process cannot be interrupted Do not disconnect USB attenuator or power supply cables do not shutdown the computer Do not use other devices while flashing If upgrade is interrupted or unsuccessful go to the end of this troubleshooter point to recover Read further 38 Follow these steps to update firmware manually 1 Answer Yes when asked about update dialog is shown in Figure 36 Firmware Upgrade window will appear Click Upgrade Firmware button Pe Firmware Upgrade B ICI x Hescan se al ports coma BATT233D In order to update controller s firmware follow these instructions 1 Click Upgrade Firmware button below 2 Press and hold Firmware upgrade button on watt Pilot controller box until this text dissappears 2 Progress bar on lower part of the window begins to fill now program is waiting for user to press Firmware upgrade button which is located inside controller box Proceed to next step P Firmware Upgrade TST COM4 AT T2330 Connecting waiting for user button press Hescen seal ports Waiting for button press EH Dont disconnect USB cable 3 Press and hold firmware upgrade button located under small hole on controllers front panel This must be done in one minute otherwis
22. ctually set power Preset buttons can be used to quickly set predefined output power Left click on any of them and appropriate value will appear in 4 or 5 text boxes If Option Automatically execute GO after required power change is selected in Options gt Preferences waveplate will rotate automatically otherwise click GO button to actually set power In order to edit preset values right click on any preset button Edit Preset Buttons window will appear Edit Preset Buttons i x All numere values below must be in the ae 0 100 Button 2 Button 4 Button 5 a slo al sl m Ce x Figure 10 Edit Preset Buttons window Currently preset values are 0 25 50 75 100 of transmission because checkbox is unchecked Otherwise all values would represent absolute power in user selected units Option Use absolute measurement units for preset buttons will be enabled only if measurement units are correctly configured in Options gt Preferences If checkbox is set clicking on preset button will update Absolute required power field 5 else Enter required value field 4 will be updated with value displayed on button e GO button Click to set power rotate waveplate STOP button will cancel rotation Buttons lt lt and gt gt will continuously decrease increase power Controller firmware must be up to date for these butto
23. d in Step Dir mode only If checked voltage level on Enable pins 3 and 11 in DB15 connector is ignored and motor is enabled or disabled depending on selection to the right Ask document Watt Pilot User manual for advanced users from supplier Overwrite Dir Input option is used in Step Dir mode only If checked voltage level on Dir pins 2 and 10 in DB15 connector is ignored and motor direction is set depending on selection to the right Ask document Watt Pilot User manual for advanced users from supplier Motor current settings Setting motor current higher than default can cause permanent damage to motor or controller so current changing sliders are disabled by default In order to activate them please enter string I understand without quotes in security text field Motion current is used when motor rotates waveplate so it must be higher than standby current Standby current is used when motor idles Additional STEP DIR current slider is present for controllers with serial numbers beginning with AATT or newer controllers with outdated firmware version This current drives motor continuously when controller operates in Step Dir mode and motor is enabled by Enable signal on DB15 connector or by enable overwrite command Motor current is cut off completely if enable signal is lost In analogy with this Motion and Standby current values are used for contr
24. dow is used to choose device to work with if there are several controllers connected to single computer Functions of this window are described in the picture below Fe Watt Pilot Selector _ 15 x File Help COM10 2nd Watt Pilot GATT155D COM15 Ad Watt Pilot SATT233D COM Figure 5 Watt Pilot Selector window It is displayed every time program is started There are three devices attached to PC in shown screenshot Double click listed attenuator to open control window for it Columns description Name It is useful to give meaningful titles for each Watt Pilot because they will be easily recognized if more than one is used in the same system For example name can be set to lst Harmonic WP and another attenuator can be named as 2nd Harmonic WP New name is saved into controller internal memory so it will be visible even if connected to another computer Name length is restricted to 20 characters maximum Watt Pilot can be renamed from Watt Pilot control window Options gt Watt Pilot Name menu option Serial Number This column shows unique Watt Pilot controller hardware serial number It is used to identify hardware at low level Use Options gt Watt Pilot Name menu option in control window to give meaningful name to attenuator COM port Each Watt Pilot gets unique serial port name after first enumeration with computer This column shows USB serial port name assig
25. e connected directly to controller s microprocessor which is 5 V device RS232 to 5 V UART converter must be used to connect device to PC for example MAX232 chip can be used for this UartRx UartTx 5 V UART input and output pins see UartOn pin description These pins are not optically isolated If galvanic isolation is needed special integrated circuits can be used for example ADUM1201 GND Ground pin of controller internal circuit it is reference for ModeSel UartOn UartRx and UartTx pins 5V Internal controller 5 V Can be used for external circuitry and can supply up to 25 mA of current 5 7 MOTOR connector pin out MOTOR connector is used to connect bipolar stepper motor and home limit switch to controller The type of connector is 9 pin D SUB female MOTOR Figure 23 Controller MOTOR connector gt Read further 24 Table 4 MOTOR connector pin out Pin No Controller serial number begins with AATT see Figure 22 on page 23 SATT see Figure 22 on page 23 6ATT see Figure 21 on page 23 1 Motor winding B output usually red wire 2 Motor winding B output usually blue wire 3 Motor winding A output usually green wire 4 Motor winding A output usually black wire 9 No connection No connection No connection 6 Zero position switch return Zero position switch return Zero position CMOS input wi
26. e contents of this manual without any notification 1 1 Watt Pilot short description Motorized Watt Pilot is a computer controlled laser beam attenuation device It attenuates free space laser beam pulse continuously without introducing additional energy fluctuations Watt Pilot is controlled by computer via USB Also it has STEP DIR INTERFACE connector for controlling via other devices 1 2 General safety requirements Motorized Watt Pilot is designed to operate in conjunction with laser system All applicable rules and regulations for safe operation of lasers must be known and applied while installing and operating Watt Pilot The customer is solely responsible for laser safety while using Watt Pilot as standalone device or integrated into system The customer must consider protective measures While assembling or operating Watt Pilot do not stare at the direct or scattered laser light even with safety goggles All parts of the body must be kept away from the laser radiation While adjusting laser beam through Watt Pilot laser power must be kept as low as possible Ha zardous laser radiation can increase while optical components or instruments are used In combination with Watt Pilot Appropriate eye protection must be worn at all times Electrical safety requirements must be complied while assembling and operating Watt Pilot 1 3 Symbols Warning Sections marked with this symbol explain dangerous situations that can
27. e process must berestarted Firmware upgrade button is marked by yellow arrow in the picture below It can be accessed with teeth stick for example 0099090 oj 6 rj ba Figure 37 Firmware upgrade button location inside Watt Pilot controller 4 Hold Firmware upgrade button pressed until confirmation about release will be displayed in Firmware Upgrade window as shown below Usually button must be held pressed up to 15 seconds Process status is displayed above progress bar Pe Firmware Upgrade i E x Hescen se al ports Please release Firmware upgrade button on controller box Writing Finmware SATT vi3 hex Manually choose hexfie for advanced users only Firmware fte hex Waiting for button press Wnting HERE EEE Dont disconnect USE cable 5 Now wait till Firmware upgrade was successful message appears I t will take up to 1 minute to complete Firmware upgrade complete MK J Firmware upgrade was successfull 6 Click OK in Firmware upgrade complete messagebox Firmware Upgrade window will close and Watt Pilot control window will start 8 3 Firmware upgrade was unsuccessful or interrupted In case firmware upgrade ended unsuccessfully due to some reasons cable disconnection program crash usually such error will be thrown then trying to use Watt Pilot x The operation has timed out
28. echanical holders Main mechanical components of motorized Watt Pilot are shown in Figure 2 Waveplate mount is designed to fit 1 inch diameter waveplate mount Polarizer holder Depends from optics Step motor Waveplate mount Figure 2 Watt Pilot main components Waveplate mount is attached to micro step motor Waveplate is fixed using two mounting rings see Figure 3 Waveplate inside the waveplate holder is rotating around the optical axis of incident laser beam Step motor and waveplate mount are shipped together in one piece Polarizer s are placed into adapter for polarizer s Polarizer s to the mount are fixed using 6 plastic bolts 3 for each polarizer Adapter for polarizer s and waveplate mount are fixed while using M4 screw Note Adapter for polarizer s can vary from showed in picture depending from polarizers type Brewster or Broadband thin film polarizer and operational mode reflection or transmission mode Also big aperture attenuator option is available Watt Pilot can be fixed to an optical table using posts and clamps or to the custom system while using M6 or M4 screw on the bottom and M4 screw on the side See chapter Watt Pilot Attenuator Dimensions on page 36 3 2 Optics assembling Note Powder free gloves must be worn while mounting optical components Avoid touching or scratching optical surfaces STEP 1 Place polarizers into
29. ector 5 ModeSel In Pulled up to 5 V 6 UartOn In Pulled up to 5 V UartRx In 8 Not Connected 9 Step K In Optocoupler cathode 10 Dir K In Optocoupler cathode 11 Enable K In Optocoupler cathode 12 ZeroPost Open Emitter 13 GND Controller ground 14 UartTx Out 15 5 V Power output 4 6 MA 2 8V 5 2 MA 3 3 V 6 8 M 5 V ModeSel These logic pins are 5V compatible with UartOn reference to GND pin Maximum input voltage is 5 5 V Below is the description of STEP DIR INTERFACE pins e Step A Step K 3 3 V 5 V compatible input to optocouplers anode Step A and cathode Step K Rising edge on Step A pin with reference to Step K advances motor by 1 step in Step Dir mode Motion direction depends on Dir signal level All stepper motors suffer from resonance Watt Pilot rotator tends to resonate at frequencies from 100 to 300 Hz so such low STEP frequencies should be avoided in Step Dir mode Vibration can be eliminated by setting higher micro stepping in settings It is necessary to mention that motor shaft is inert Frequency of STEP signal should be controlled linearly especially at high motor speeds Motor should accelerate and decelerate smoothly For instance control logic must sweep down STEP frequency before changing DIR level Similarly frequency must be swept up then reaching high motor speed Read further 21 Step Dir mode signal timing
30. ent units if correctly set in program preferences Upper indicator represents actual power of 500 JJ P ist Watt Pilot 6ATT101D jo x 5 05 mw level 3 Move lower slider to change required 10 This will drive waveplate to Home position set by calibration process and preferences power level Click GO button to apply it om am ss 752 _s000 m sll olse Enter required value 5 St mW 5 050 2 Power meter panel Shows output power value at which attenuatoris currently set to 6 Preset buttons instantly change required power 4 Enter required power level here in percent Click GO to set 5 Absolute required power field is used to set power level using known units if correctly set in program preferences 8 Immediately stops Watt Pilot rotation 9 Hold this button to constantly decrease power 9 Hold this button to constantly increase power 7 Click GO to apply power level which is shown in text boxes Figure 8 Watt Pilot Control window Currently laser power is set to 5 05 mW or 50 of full calibrated range Measurement units are available because absolute minimal and maximal power values are set in program preferences during calibration process Read further e Lower slider changes power from 0 to 100 90 in 0 25 90 steps
31. er Program preferences description on page 15 for details e Watt Pilot Name This will open Rename Device window Use up to 20 characters for name Enter new name and click OK to accept px Enter new Watt Pilot name list Watt Pilot Cancel i Figure 11 Rename Device window Motor Settings submenudescription Set Safe Settings This option will set waveplate rotator angular velocity to 8 73 deg s with acceleration and deceleration on Such motor settings should be used if Optimized settings causes motor to stall or miss steps Such problems may arise with old worn out attenuators Attenuation from 0 to 100 is changed in 7 seconds These timings apply to Standard small aperture waveplate rotator Set Optimized Settings This will set waveplate rotator angular velocity to 14 076 deg s no acceleration and no deceleration This is more faster motion than Safe settings Attenuation from 0 to 100 is changed in 3 19 seconds Waveplate turns 360 degrees in 25 6 seconds These timings apply to Standard small aperture waveplate rotator All new attenuators will perfectly work with such option selected Advanced This will open Motor settings window where motor speed can be tweaked It can be used for trouble shooting or to find optimal working point between optimal and safe Help menu description e User Manual Show this help file
32. erial commands and protocol Watt Pilot is a slave device according to computer and computer is a master device That means that PC sends data requests to attenuator and attenuator must respond Watt Pilot itself will never send data to computer without request except of two cases if Report zero position command zr setting is set also string USB Mode r n is sent upon controller start if controller starts in Command mode Watt Pilot controller writes all received bytes to internal buffer If it receives carriage return symbol or r in C denotation 13 th symbol in ASCII table or 0x0D in hex device will try to parse received bytes as a command string and will execute it Attenuator echoes back every byte it receives back to computer except for r Symbol echoing is essential for users who literally type commands in terminal window This enables user to see what data is sent to device because not all terminal programs has a text field where sent symbols are shown n 0x0A symbol is treated like all other symbols gt Read turther 21 Watt Pilot will respond to byte r by sending Table 7 Serial commands list additional data if command requires it Additional data is terminated with r n symbols Termination entx This command is effective only in Step Dir symbols r n are essential for users who literally type mode commands in terminal window These symbols are not C
33. ero position switch Parameter x 1 Position counter will become 0 on each zero position switch press 0 Position counter increases position continuously 23 Reserved 24 Reserved en Xx Response example default controller settings 1 0 232 232 55000 114 36 114 2 1 1 0 0 0 1 0 1 1 Motor enable in Command mode Parameter x 1 Motor is enabled 0 Motor is disconnected 1 0 0 0 0 1 gt Read further 32 Reset controller Controller resets in 4 s after issuing this command It is equivalent to power switch press This command can also enter into firmware upgrade mode if firmware upgrade button is pressed All changed settings and position are restored in previous State if ss and or so commands was not issued before reset Then controller starts it sends string STEP DIR mode or USB mode according to state of pin ModeSel a0 Turn off acceleration do Turn off deceleration SS Save settings of controller Save configuration mentioned in pc command description to controller memory Configuration saved by ss command will be restored on controller power on sn X Write 20 character long name to controller Parameter x 20 characters If x is not 20 symbols then returned name can consist of unreadable characters Please space pad trailing name Show name Returns 20 character string saved by sn command Retu
34. h Set motor 7 Command power Motor parser driver m dal5 ju E E EF E ES E E E E E E SS SS SSS E E 7 E EN l l l Figure 18 Block diagram of Watt Pilot controller 5 4 Operation modes Command mode This is thefirstof two possible controller operation modes Command mode is selected if pin5 ModeSel is left unconnected in front STEP DIR INTERFACE connector Motor position is set by sending ASCII commands to controller Controller has USB and UART interfaces for communication STEP DIR ENABLE inputs are disconnected in this mode Watt Pilot appears as virtual serial port in computer device list when connected Watt Pilot software uses this port to change attenuation It is easy to write own program to integrate with controller Device can be accessed by any serial port program USB drivers are available for Windows Windows CE Mac or Linux see List of supported operating systems for USB drivers on on page 26 Serial commands are listed in Serial commands and protocol on page 27 Apart from USB UART connection is available in STEP DIR INTERFACE connector It can be used to communicate with microcontroller or prolong cable length with RS232 level shifter See STEP DIR INTERFACE connector pin out and specifications on page 21 Attention Watt Pilot software only supports Command
35. her bipolar stepper motor can be driven Bipolar stepper 12V 2A power motor driver supply Home position switch signal Figure 15 Illustration of Watt Pilotcontroller advanced features 5 2 Controller connections Watt Pilot front and rear connectors are shown in the pictures below LCE Figure 16 Controller front view e USB connector is used to control Watt Pilot with computer Firmware upgrade button is hidden under small hole highlighted by arrow Used to recover if firmware upgrade process crashed See TROUBLESHOOTING on page 38 if necessary STEP DIR INTERFACE connector can be used to control Watt Pilot with microcontroller via UART or Sep Dir pulses See section Operation modes Step Dir mode on page 20 Read further 18 MOTOR Figure 17 Controller rear view Controller power supply socket Plug dimensions outer diameter 5 5 mm GND central pin diameter 2 1 mm 12 V Watt Pilot requires 12 VDC 2 A power supply ON OFF switch Green led indicatesthat controller ISON MOTOR connector 9 pin D SUB female Connect it to Watt Pilot attenuator See MOTOR connector pin out on page 24 for more information Note Controller can be used to drive variety of bipolar stepper motors not onlyWatt Pilot attenuator For example most linear stages are driven by stepper motors so these controllers can be used to con
36. home position determined by zero position wt x switch Then motor stops controller stores 0 in coordinate counter and saves this value Set motor current then controller operate in STEP DIR mode There is no automatic current control like stand by current in USB mode Current can be cut only by logic high on Enable input This applies only for 4ATT or SATT controllers with firmware version v7 or lower This command is absent for 5ATT and GATT controllers with firmware v8 and higher Parameter x Integer number in range of from Oto 255 Motor current can be calculated using such equation 0 00835x A Read further 29 ax Set acceleration Parameter x Integer number in range of from 0 to 255 1 is the lowest acceleration and 255 is the highest 0 turns off acceleration Turning on acceleration helps to increase position repeatability Set deceleration Parameter x Integer number in range of from 0 to 255 1 is the lowest deceleration and 255 is the highest 0 turns off deceleration Turning on deceleration helps to increase position repeatability SX Set maximal motor speed Parameter x Integer number in range of from 1 to 65000 Watt Pilot waveplate rotation angular speed can be calculated using such formula 14400000 Ww y 78r 65535 x Here w angular waveplate rotation speed degrees per second r micro stepping resolution 1 2 4 8 o
37. iew There is a Serial port control in LabView Add it to your LabView project and set its properties to parameters listed in Table 6 on page 26 Then use commands described in Serial commands and protocol on page 27 to control motor use g xx m xx commands for moving and o command for checking if motor has stopped To calculate motor step position for required laser power use formulas shown in chapter Relation between motor position and laser power on page 35 34 6 7 Relation between motor position and laser power Transmitted laser power ratio can be in range of 0 0 max attenuation to 1 0 min attenuation According to Malus law waveplate angle can be calculated from ratio p cos Vratio degrees In order toget motor step position steps from waveplate rotator angle userelation steps o k r where coefficient kK is steps per unit depending on waveplate rotator k 43 333 steps deg for standard attenuator and k 100 0 for big aperture attenuator coefficient r is controller s resolution parameter it must be read from controller cc using p Options gt Motor Settings gt Advanced r can be 1 command or got in Watt Pilot software 2 default 4 8 16 microsteps per step So motor step position steps using standard attenuator with default unchanged from purchase settings can be calculated
38. ing both min and max positions in Step 5 makes no sense gt Read further 12 6 Non ideality of polarizers and waveplate will cause losses so 100 percent transmission will pass less energy than available and 0 transmission actually does not block all radiation Real maximal and minimal transmitted power can be measured while calibrating Watt Pilot in Step 5 These extreme values should be entered in relevant fields of Step 6 For example one uses 1 W laser and 20 mW is measured as minimal power and 0 99 W as maximal power So it is handy to check Use absolute power measurement units put value 0 02 into field Minimum measured value 0 99 into Maximum measured value and write W into Enter measurement units to use textbox because measurement units are Watts 7 Click OK button to accept calibration or Cancel to discard If dialog asking to home will appear answer Yes for correct device operation 4 6 Watt Pilot Control window This window is used to change laser power after Watt Pilotattenuator Calibration procedure must be finished before correct attenuator operation Main components of this window are described below Watt Pilot name and serial number is shown on each attenuator control window caption Watt Pilot can be renamed by Options gt Watt Pilot Name menu option Name is convenient if more than one device is
39. mechanical adapter Polarizers must face each other with surfaces coated with dielectric coating Dielectric coating is marked with an arrow so you have to put the polarizer s with the arrows on the sides facing each other Then fix polarizer s with the plastic bolts use all 3 plastic bolts to fix one polarizer Note Do not tighten up the bolts too much since it can bend the polarizer and thus distort the laser beam STEP 2 Put the wave plate into attenuator between two mounting rings as shown Be sure that wave plate is immobilized tightly STEP 3 Attenuator consists of two mechanical parts User should assemble both mechanical parts together STEP 4 Use fixing screw to tighten both parts together Figure 3 Assembling the Watt Pilot 4 Watt Pilot Software Description 4 1 Computer requirements e Free USB port Watt Pilot is compatible with USB 1 1 USB 2 0 and USB 3 0 e Computer administrator rights only for installation e Windows XP sp3 32 bit e Windows Server 2003 sp2 32 bit e Windows Vista sp1 32 64 bit e Windows Server 2008 32 64 bit e Windows 7 32 64 bit e Windows 8 32 64 bit e Microsoft Net framework 4 0 redistributable installs automatically 4 2 Software installation 1 Check for and download latest Watt Pilot software installer package from www altechna com product_ details php id 824 2 Run downloaded Watt Pilot Setup exe installation file In case you are i
40. ned by Windows COM port name is necessary to know for advanced users who want to use serial commands in their applications See chapter Serial commands and protocol on page 27 for more details about this e Status This column shows Connected if attenuator control window is active otherwise it is blank File menu description e Connect This opens control window for selected Watt Pilot it does the same as double clicking in device list If only one device is connected during program startup control window will be opened automatically See chapter Watt Pilot Control window on page 13 for information Search For Devices This will force searching for Watt Pilot devices attached to computer It can help if not all devices are detected and listed automatically Close This will close Watt Pilot Selector window but leaves control windows opened if any Exit This will close Watt Pilot Selector window and all control windows too Help menu description e User Manual This will open this help file About This will show software version and contact information Please include software version and controller serial number when contacting manufacturer 11 4 5 Calibration In order to correctly change output power software needs to know at what angle A 2 waveplate is It can be fixed in any angle with respect to rotator It is known that waveplate is positioned at 45
41. ns to appear These buttons are not available for controllers with serial numbers beginning with 4ATT If Rotate continuous option in program preferences is set waveplate can be rotated to any angle otherwise waveplate motion is restricted to 0 45 degrees Home button will drive waveplate rotator to home limit switch and back to Home position set n Options gt Preferences Usually this should be executed every time when device Is turned on File menu description e Save Calibration Current program settings can be saved to file Configuration file includes all options in Options gt Preferences preset values and calibration offset Run time program configuration files are saved in folder Application data for all users A techna Watt Pilot Settings Load Calibration Program settings can be restored from file Configuration file includes all options in Options gt Preferences preset values and calibration offset Current configuration will be overwritten Show Device Selector This will open Watt Pilot Selector window Close This Window This will disconnect from Watt Pilot and close active Control window Read further 14 Options menu description e Calibration This will open Watt Pilot calibration window See chapter Calibration on page 12 for details e Preferences This will open program configuration window See chapt
42. nstalling on operating system that does not meet requirements only USB drivers will be installed Click Yes to continue Watt Plot 20 0 Setup Windows XP Service Pack 3 or above is required to run Watt Pilot software Only serial port drivers wall ty be installed so you wil be able bo control Watt Pilot by sending commands via serial port continue setup CE Read further 8 3 Installation window will appear click Next to continue 6 Watt Pilot software requires Microsoft NET Framework 4 Client Profile or higher version to be Ps Wall Pika 9 0 1 0 Selop OJ X installed Setup will offer to download it choose Welcome to the Watt Pilot 7 0 1 PN Setup Wizard Yes if you have active internet connection Choose This wizard v l guide you trough the instalation of Watt No to download it from www microsoft com Tt is recommended thet you dose all other applications en us download details aspx id 17113 and install before starting Setup This wil make IF possible to update eee it manually You should choose No if you wish to Gick Next to continue install any newer version of framework or do not have a working internet connection This dialog will not appear if framework is already installed Download size is 42 Mbytes F Next gt Cancel pe Watt Pilot 0 1 0 Setup Watt Plot requires Microsoft Met framework 1 Chernt profile or higher to be instalied
43. nt tree 3 and look for Ports COM and LPT 4 Each connected and powered on attenuator appears as Silicon Labs CP210x USB to UART Bridge Serial port name Serial port name is shown in parentheses as seen in the picture below fel Computer Management l S Be acon Yew Window ueb la 08 6 Pn A Computer Management L See Disk drives Display adapters m DVOPOD ALON dives da Human interface Devices IDE ATAJATAPI controles F zj magng devon Figure 27 Finding Watt Pilot serial port name using Windows Computer Manager Third way to identify Watt Pilot is to open each serial port and send p command If attenuator is present on that port it will send back string starting with USB as listed in Serial commands and protocol on page 27 If device is not present no bytes will be received or received string will not begin with USB Serial port read timeout can be set to 50ms to speed up scanning process This method is universal and can be used with any operating system Read next chapters about serial port parameters and command list Linux users can find Watt Pilot port by executing command root dmesg grep cp210x root Aivaras home Aivaras installpkg Downloads cutecon 0 22 6 1486 las txz Verifying package cutecom G 22 0 1486 las txz Installing package culecom 0 22 0 1486 las liz PACKAGE DESCRIPTION CuteCom
44. o proper ENABLE handling must be implemented by wiring or by using commands Attention In case controller with serial number 4ATT or controller SATT but with outdated firmware is used STEP DIR current value is used if motor enabled If ENABLE pin is high motor is completely disconnected This caused lack of holding torque on idle state and step position could be lost This was fixed for SATT controllers in firmware version v8 released on August 22 2012 and newer controllers STEP DIR current setting is abandoned in latest controllers 20 5 6 STEP DIR INTERFACE connector pin out and specifications STEP DIR INTERFACE connector is used to operate controller in Step Dir mode or use UART interface instead USB The type of connector is 15 pin D SUB female Table 2 STEP DIR INTERFACE connector pin out Table 3 STEP DIR INTERFACE connector electrical specifications Input pins Description UartRx UART baud rate 38 400 8 data bits 1 UartIx stop bit no parity RXD and TXD pins are 5 V compatible with reference to GND pin Maximum input voltage is 5 5 V Step Dir En These pins are optically isolated 3 3 V 5 V compatible Input current requirement per pin Pin No Name Type 1 Step A In Optocoupler anode 2 Dir A In Optocoupler anode 3 Enable A In Optocoupler anode 4 ZeroPosC Open Coll
45. ode Enable A and cathode Enable K This input reduces motor current in in Step Dir mode 5 V on Enable A pin with reference to Enable K reduce motor current to Standby current value set in controller settings Otherwise Motion current flows to motor and STEP pulses rotate the motor This input can be overridden by command parser see Serial commands and protocol on page 27 and Figure 18 SW F on page 19 for details User 5V User zero position signal Pin 4 Voltage Attention Motor current is set by ENABLE signal so leaving it high can overheat the motor so proper ENABLE handling must be implemented by wiring or by using commands User 5V User zero position signal Switch released Switch pressed STEP DIR INTERFACE connector D SUB15 Female STEP DIR INTERFACE connector D 5UB15 Female Attention In case controller with serial number 4ATT or controller SATT but with outdated firmware is used STEP DIR current value is used if motor enabled If ENABLE pin is high motor is completely disconnected This caused lack of holding torque on idle state and step position could be lost This was fixed for SATT controllers in firmware version v8 released on August 22 2012 and newer controllers STEP DIR current setting is abandoned in latest controllers ZeroPosC ZeroPosE These pins are used to sense
46. ollers with serial number 5ATT or 6ATT so third slider is hidden Third slider should be used only by advanced users and does not relate to watt pilot attenuator directly Default motion current is 0 95 A for standard and big aperture attenuators standby current is 0 3 A by default Write settings button Click this button to save configuration into controller memory Currently displayed settings will be reloaded after controller power cycle If this button is not used previously saved changes will be loaded after controller restart e Read settings button This will load configuration from controller 4 9 Firmware update Once connected Watt Pilot software checks firmware version on device and updates it if necessary Progress bar will popup informing user that firmware update is in progress and one must wait until flashing process is finished P Firmware Upgrade HERE EAe Dont disconnect USE cable Figure 14 Normal firmware update process finish is indicated by Firmware upgrade complete message Itwill take up to one minute and requires that user do not disturb update process This process is not cancellable Do not disconnect USB or power supply cables do not shutdown the computer This window can appear after Watt Pilot software is updated because latest firmware comes with Watt Pilot installer file Confirmation message will appear after update is completed click OK and program
47. ontrols software disconnecting of Enable visible but they format received data window text so it input pin switch SW E see Figure 18 looks organized Parameter x 1 Enable pin is disconnected motor is From computers perspective each command is ended bled enabled by byte Yr Enter key press usually sends this symbol m 0 Enable pin is disconnected motor is disabled off motor power is controlled by signals on Enable input pin in STEP DIR INTERFACE connector Example in most of terminal programs Command and command parameter is separated by space symbol 0x20 For example typing such string g 3000 in terminal application and pressing enter key on the keyboard will drive waveplate rotator to absolute position of 3000 steps Here g 0x67 is a command space 0x20 is a separator and 3000 0x33 0x30 0x30 0x30 is a command parameter which corresponds to 3000 steps All sent bytes in hexadecimal will be 0x67 0x20 0x33 0x30 0x30 0x30 0x0D including command end symbol ent off motor power is controlled by input pin Now send ss to save this setting to controller em dirx This command is effective only in Step Dir W or Enter key press New command can be sent mode after 50 ms O Controls software disconnecting of Dir input There is no command acknowledge in protocol so pin switch SW F see Figure 18 50 ms
48. operating systems than Watt Pilot software Virtual USB Com port drivers can be installed on e Windows 2000 32 bit e Windows XP 32 bit Windows Server 2003 32 bit e Windows Vista 32 64 bit e Windows Server 2008 32 64 bit Windows 7 32 64 bit Windows 8 32 64 bit There is no need to install any drivers on modern Unix like Linux MAC operating systems Watt Pilot is automatically recognized and installed as ttyUSB device after connecting it to computer You can check which serial port is assigned in your UNIX machine with command root dmesg grep cp210x 6 2 Serial port parameters Serial port parameters to be used are shown in a table below Table 6 Serial port parameters Baud rate 38400 Parity None Handshaking None Stop bits 1 26 6 3 Identifying serial port name First step to control Watt Pilot using serial port and commands would be to find out which serial port is assigned for device This can be seen in Watt Pilot Selector window list see section Watt Pilot Selector window on page 11 In case only drivers were installed no Watt Pilot software itself see Computer requirements on page 8 serial port name could be checked in Windows Computer manager Right click on My Computer 1 select Manage 2 Computer manager window will appear Click on Device Manager under Computer Manageme
49. polarized light Rotating phase retardation of M2 wave plate is placed in the incident polarized laser beam The intensity ratio of those two beams may be continuously varied without alteration of other beam parameters by rotating the waveplate The intensity of either exit beam or their intensity ratio can be controlled over wide dynamic range P polarization should be selected for maximum transmission or high purity s polarization should be reflected when maximum attenuation of the transmitted beam takes place Proper functioning of Watt Pilot requires optimal configuration of optical elements regarding to incident laser beam polarization contrast Higher incident laser beam polarization contrast leads to higher Watt Pilot output polarization contrast Brewster type thin film Rotating M2 polarizers waveplate a Incident laser Transmitted p polarized beam laser beam Reflected s polarized laser beam Figure 1 Watt Pilot operating principle Color differences shows intensity of laser beam Brighter red means more intensive laser beam 3 Packaging contents Motorized attenuator e Controller USB cable 2m length recomended but no longer than 3m e 12V power supply cable optional Software installation instructions in USB flash e Two waveplate retaining rings with tightening key Brewster polarizator holder optional 3 1 Watt Pilot Main Components Optical components are placed into m
50. power after Home button clicked Automatically execute GO after required power change This allows waveplate to rotate automatically if required power was changed by editing values in numeric fields Read further 15 Automatically execute GO after slider change This allows waveplate to rotate automatically if required power was changed by moving the slider Automatically execute GO after required power change must be checked for this options to be enabled Use absolute power measurement units Setting this will enable power to be measured with absolute measurement units Minimum and maximum power values must be known for this option to work This setting can also be changed in Calibration window Measurement units to use Alphanumerical string can be entered here to represent measurement units Default is mW but can be changed to uw if working with micro watts Minimal and Maximal power meter reading These fields must be filled with minimal and maximal measured power values Decimal separator symbol is dot These values will appear as available power range in main window Use absolute measurement units for preset buttons If this is set preset button values are shown as absolute power values otherwise preset button values mean of transmitted power Option Use absolute power measurement units must be set for this option to be enabled Preset bu
51. r 16 Controller advances motor per one step in time intervals equal to T 65535 x 8 us Show controller settings related to Command mode Type this command only when using terminal and manual command entering This is the way to see fundamental settings in eye friendly fashion To get controller settings for software programming use pc command instead This command can be used to ping controller to check if controller is attached to particular COM port If device response to p r string begins with PUSB it means that Watt Pilot is attached and is turned on Return string finished with 0x0A and 0x0D symbols USB 1 a 2 d 3 s 4 wm 5 ws 6 wt 7 r 8 en 9 zr 10 zs 11 1 Boolean 1 or 0 Current operating mode Command mode if 1 and Step Dir mode if 0 2 Integer 0 255 Acceleration value 3 Integer 0 255 Deceleration value 4 Integer 1 65500 Speed value 5 Integer 0 255 Motor motion current value 6 Integer 0 255 Motor idle current value 7 Integer 0 255 Motor current value in Step Dir mode 8 Integer 1 2 4 8 or 6 Micro stepping resolution value full hal guarter eight or sixteen 9 Boolean 1 or 0 Motor enable motor is enabled if 1 and motor is disconnected if O 10 Boolean 1 or 0 Whether to report coordinate then hitting zero position switch if 1 or do not report if 0 If this option is on 1 con
52. regrams Altechn Created uninstaller C Program Files altechna Watt Pilotiuninst exe Completed Nullsoft instal system web 10 Click Finish to end installation Program cannot be opened if only drivers were installed see step 2 for details Bs Wall Pika 7010 Sebup Siml JFG Completing the Watt Pilot 2 0 1 0 Setup Wizard Watt Pilot 2 0 1 0 has been installed on your computer Click Finch to dose the wizard Bun Watt Pilot 2 0 1 0 ER KS MPL ES 11 Watt Pilot software icon will appear on All Users desktop and All Users start menu 12 Connect waveplate rotator to Watt Pilot controller 13 Connect Watt Pilot and PC via USB cable 14 Plug in Watt Pilot power supply jack and AC adaptor to wall outlet 15 Windows will detect new hardware Wait until windows configures new device iJ Foul New Hardware x Your new hardware is installed and ready to use X8HRRQhb GH Tj LE OP2102 USD to UART Dridge Controler 16 Device installation is now complete launch Watt Pilot program using Watt Pilot icon on desktop 4 3 Program first run Launch Watt Pilot program using Watt Pilot icon on desktop or from Start Menu gt All Programs gt Altechna gt Watt Pilot gt Watt Pilot Watt Pilot Selector window will appear At least one device must be displayed in the list If the list is empty please check USB cable power connection and ON
53. requirements are shown in Figure 20 ModeSel Motor current Motor disabled High O gt En Stand by current Step Motor direction clockwise High Dir STEP DIR mode selected Low Motor enabled Low USB mode selected Highh 6 Motion current ap Counter clockwise Low Symbol Description Min Typ Max Unit tA ModeSel wait time Controller switches to Step Dir mode after 1 S ModeSel pin goes low tB Wait time for first valid STEP pulse after En pin goes low 20 ms tC Time constant then motor current reaches motion current value 15 18 20 ms after En pin goes low tD Time constant then motor current reaches stand by current value 15 18 20 ms after En pin goes high tE STEP pulse period 35 US tF STEP high level time 5 US tG STEP low level time 10 US tH DIR setup time E US tl DIR hold time if US Figure 20 Step Dir mode input signal timing requirements Read further 22 e Dir A Dir K 3 3 V 5V compatible input to optocoupler anode Dir A and cathode Dir K This input controls motor direction in Step Dir mode 5 Von Dir A pin with reference to Dir K sets motor direction clockwise This input can be overridden by command parser see Serial commands and protocol on page 27 and Figure 18 SW F on page 19 for details Enable A Enable K 3 3 V 5 V compatible input to optocoupler an
54. result as personal injury or death Always read the associated information carefully before performing indicated procedure Attention Paragraphs preceded by this symbol explain hazards that could damage the instrument and connected equipment or may cause loss of data Note This manual also contains NOTES and HINTS written in this form 1 4 Regulation Attention The following statement applies to the products covered in this manual unless otherwise specified herein The statement for other products will appear in the accompanying documentation These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment gene rates uses and can create radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference with radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures e Reorient or relocate the receiving antenna e Increase the separation between the equipment and receiver Connect the equipment into an outlet on a circuit different from that to which the receiver is connected e Cons
55. rn 20 character string 6 5 Software recommendations There are plenty of applications built for serial port communication Windows XP and full installations of Windows 7 or Windows 8 has native hypertrm exe terminal application which can be launched by typing hepertrm in Run dialog Winkey R Linux and OS X users can use free CuteCom http cutecom sourceforge net utility see Figure 28 on page 27 For Windows OS it is recommended to use free tool terminal exe from https sites google com site terminalbpp Figure 29 on page 34 Configure terminal exe as follows 1 Select correct com port number see Identifying serial port name on page 27 2 Select correct serial port configuration values see Table 6 on page 26 3 Set Hex checkbox if received characters should also be shown as hexadecimal values 4 Click Connect button 5 Type in command and press Enter key on keyboard Command string p r is sent to device as shown in example picture Look at Serial commands and protocol on page 27 for available commands 6 Watt Pilot response is shown in middle pane Hex representation of all received bytes is shown on the right Controller speed setting is set to 55000 as seen in example screenshot Read further 33 Terminal 1 9b 20108 160 by Briy Auto Dis Connect Time Det bon AutoStart Script I CR LF C
56. rostepping 2 half microstepping 4 8 or 16 microsteps That means that standard waveplate rotator can have resolution of 15600 31200 62400 124800 or 2496000 steps per full turn Big aperture waveplate holder can have 36000 72000 144000 288000 576000 steps per full turn resolution No microstepping can cause motor resonance problems The higher the resolution the smoother and quieter motor is but motor torque and speed will decrease Half stepping resolution is used as default Read further 16 Step frequency Motor step frequency so waveplate angular velocity can be changed Step frequency f Hz can have discrete vales such as 8000000 65535 n where n is integer in range of 1 64000 Waveplate angular velocity w degrees second is equal to w 360 k r f Parameter k is 15600 for standard attenuator and 36000 for big aperture attenuator Resolution divider r can be 1 2 4 8 or 16 as mentioned earlier in Resolution description Safe step frequency is 759 4 Hz optimized step frequency is 1224 2 Hz but can be tweaked for best performance Accelerate and Decelerate If this option is set motor gradually accelerates till maximum frequency is reached or decelerates till stop This can help to solve stall problems on worn out mechanics but causes motion to last longer These options should be unchecked for normal usage Default is unchecked Overwrite Enable Input option is use
57. s or agents be liable for any indirect special incidental or coseguential damages including damages for loss of profits loss of business loss of use or data interuption of busines and the like even if Altechna has been advised of the possibility of such damages arising from any defect or error in this manual or product Specifications and information contained in this manual are furnished for informational use only and are subject to change at any time without notice and should not be construed as a commitment by altechna Altechna assumes no responsibility or liability for any errors or inaccuracies that may appear in this manual including the products and software described in it This manual is directly connected to firmware version Latest firmware software and manual versions can be downloaded from www altechna com Products and corporate names appearing in this manual may or may not be registered trademarks or copyrights of their respective companies and are used only for identification or explanation and to the owner s benefit without intent to infringe 1 Introduction This user manual is designed to help to install and operate Watt Pilot Before installing and operating Watt Pilot please read installation and operation instructions carefully Safety instructions must be read carefully If there are any questions about contents of this manual please contact info altechna com Altechna reserves the right to updat
58. state of the motor and current position Return string finished with Ox0A and 0x0D symbols 1 2 1 Integer 0 1 2 or 3 Current motor run state 0 motor is stopped 1 accelerating 2 decelerating 3 running at constant speed 2 Integer in range of 2147483646 2147483646 Current motor position Response example 334437 Use this command to determine if motor has done its movement After issuing any move command poll o command in time intervals about 250 ms and decode response If 1 parameter become 0 it means that motor has stopped and is ready for next move command 20 Boolean 1 or 0 Status of switch SW F see Figure 14 1 means that Dir pin is zr x disconnected and motor turns clockwise if 17 parameter is 1 or counterclockwise if 17 is equal to 0 If 20 is 0 then motor direction is dependent on logic level on Dir input Report zero position when hitting zero position switch Parameter x 1 Controller sends string zp integer_value on each zero position button press 0 Turn off zero position reporting 21 Boolean 1 or 0 Status of switch SW E see Figure 14 1 means that Enable pin is ZS X disconnected and motor is enabled if 18 parameter is 1 or disabled if 18 is equal to 0 If 21 is 0 then controller output state is dependent on logic level on Enable input 22 Reserved Reset coordinate counter then hitting hardware z
59. tage spike detected for accurate zero position detection e ModeSel Then this pin is connected to GND pin 13 controller switches into Step Dir mode If this pin is left unconnected or applied 5 V with reference to controllers ground pin 13 Step Dir Enable inputs become disconnected and controller works in Command mode ModeSel pin controls internal switches SW B SW C SW D Controller internal block diagram on page 19 ModeSel pin is not optically isolated and is pulled up to internal 5 V See Watt Pilot controller connection examples and input circuit diagram on page 26 UartOn This pin controls internal switch SW A which sets command path to the command parser Controller internal block diagram on page 19 Then this pin is connected to GND pin 13 controller isaccessed by 5V UART interface UartRx and UartTx pins instead of USB port Useful if controller is operated by user s microcontroller FPGA All Command mode commands are valid If this pin is left unconnected or applied 5 V with reference to GND command parser gets commands via USB port UartOn pin is not optically isolated and is pulled up to internal See Watt Pilot controller connection examples and input circuit diagram on page 26 Attention Watt Pilot software only supports Command mode and only via USB connection It will not work if RS232 level shifter is used Attention UART pins ar
60. th pullup kose k T No connection GND 5V power supply for optical sensor up to 70 MA 8 No connection No connection Pull up to 5 V not used 9 Zero position switch Zero position switch GND Connector pin out changes were made in controller hardware revisions Only mechanical limit switch can be used with controller serial numbers 4ATT and SATT connected to pins 6 and 9 Latest Watt Pilots with 6ATT serial number come with optical home position sensor on rotator so limit switch input circuit is essentially different from previous hardware versions See Figure 21 on page 23 and Figure 22 on page 23 for differences 6ATT rotators are not compatible with AATT or SATT versions of controllers All versions of rotators can be used with 6ATT controllers 5 8 Supported Stepper Motors There are two types of stepper motors unipolar and bipolar Controller supports bipolar stepper motors ln order touse unipolar motor as bipolar center wires from both windings must be left unconnected Motor winding resistance multiplied by motor current must be less than 11 5 V Controller can drive up to 2A maximum current and 1 6 A continuous ST2818S1006 stepper motor can be chosen as reference for motor requirements because it is used as waveplate rotator Unipolar stepper motor Bipolar stepper motor EE ee eee ee n a KL KL o oO Motor wire Controller pin number
61. tions 33 6 6 Serial command usage with National Instruments LabView 34 6 7 Relation between motor position and laser power 35 7 Watt Pilot Attenuator Dimensions 36 7 1 Standard attenuator dimensions 36 7 2 Big aperture attenuator dimensions 37 7 3 Watt Pilot controller dimensions 38 8 Troubleshooting 38 8 1 Real laser power does not match shown in software 38 8 2 Upgrade controller firmware now message appears 38 8 3 Firmware upgrade was unsuccessful or interrupted 39 9 List of Tables 41 Watt Pilot February 2015 Copyright UAB Altechna All Rights Reserved No part of this manual including the products and software described in it may be reproduced transmitted transcribed stored in a retrieval system or translated into any language in any form or by any means except documentation kept by the purchaser for backup purpose without the express written permission of UAB Altechna hereinafter Altechna Product warranty or service will not be extended if 1 The product is repaired modified or altered Unless such repair modification of alteration is authorized in writing by Altechna OR 2 The serial number of the product is defaced or missing Altechna provides this manual as is without warranty of any kind either express or implied including but not limited to the implied warranties or conditions of merchantability for a particular purpose In no event shall altechna its directors employee
62. trol them See Supported Stepper Motors on page 25 about such capability Zero position switch or optical sensor Ti Hm T i 1f Step A H3600 BH 9 Steplk Made el 8 NC Internal t y Internal GND Step Dir connector ere Pe ee USB SWA connector 20 zo wpe 20 F ajaj e ao Ts o m E G E a AS eee 30 z ae a a x a Vv lr a Internal Step Dir n HESE s 5 Ela signal generation E Z s s m a 5 E Z 5 3 Controller internal block diagram Watt Pilot controller consists of three blocks Each is shown in Figure 18 Motor driver This block drives motor by controlling currents in motor windings according to Step Dir Enable and motor power signals Command parser This block parses commands acquired from USB or UART depending on switch A state SWA The state of switch A can be changed by logic level on input UartOn in STEP DIR INTERFACE connector Also this block can select which Enable and Dir signals to use in Step Dir mode internally generated or picked up from STEP DIR INTERFACE connector pins Switch E and F are used for this purpose Internal Step Dir signal generator This block generates acceleration continuous speed and deceleration step pulses Also DIR and enable signals when controller is working in Command mode L m JA ic Motor Motor connector Feedback from zero position switc
63. troller sends string zp integer_position on each zero position button press 11 Boolean 1 or 0 Whether to reset position counter on each zero position switch press or no If this option is disabled 0 zero position button press does nothing to step counter If waveplate holder turned twice command o will show us that position is more than 15600 15600 is full waveplate turn in full stepping mode If this position is enabled 1 position counter will become 0 on each zero position switch press Response example default controller settings USB 1 a 232 d 232 s 55000 wm 114 ws 36 Wt 114 r 2 en 1 zr 0 zs 0 Read further 30 pt Show controller settings related to Step Dir pc mode Type this command only when using terminal and manual command entering This is the way to see settings in eye friendly fashion To get controller settings for software programming use pc command instead Return string finished with Ox0A and 0x0D symbols swEn 1 en 2 swDir 3 dir 4 zr 5 zs 6 cs 7 All returned parameters are boolean 0 or 1 1 Boolean 1 or 0 Status of switch SW E see Figure 18 1 means that Enable pin is disconnected and motor is enabled if 2 parameter is 1 or disabled if 2 is equal to 0 If 1 is 0 then controller output state is dependent on logic level on Enable input 2 Boolean 1 or 0 Motor enable motor is enabled if 1 and motor
64. tt Pilot Attenuator Dimensions 7 1 Standard attenuator dimensions m uw O Yo ood 2 o m O a D JE Z a m ob v lt 5 B L O O B D C SS a o lt i r v P S S B c O p 9 iE YN we PA 7 2 Big aperture attenuator dimensions Figure 33 Whole view of big aperture attenuator 22 0 EE AN 50 0 21 0 Figure 34 Mechanical drawings of Watt Pilot big aperture attenuator All dimensions shown in millimeters Sf 7 3 Watt Pilot controller dimensions Figure 35 Watt Pilot controller dimensions 8 Troubleshooting 8 1 Real laser power does not match shown in software Click Home button inWatt Pilot Control window This eliminates angular error which can occur if power is lost during waveplate motion 8 2 Upgrade controller firmware now message appears Sometimes Watt Pilot software will show dialog asking whether to update firmware Upurade wouter firmware mow 7 Controlers you are trying to connect 5ATT2320 firmware is not up to date v3 Do you want to upload latest firmware v 120 now Figure 36 Dialog asking whether to update firmware This will appear if controller firmware cannot be updated without user interaction and depends only on controller firmware version not related to hardware revision It will pop up if
65. tton values are recalculated automatically with respect to min and max measured power 4 8 Motor settings description Motor settings can be accessed from Watt Pilot Control window by Options gt Motor Settings gt Advanced These settings are for advanced users only Security passphrase for motor current controls is I understand F Motor settings for 6ATT101D mc xi 1 2 Hall Steps 0 0115 deg Step Step Frequency 122421 1221 52117H2 General Settings SA jj a so Mor urent A er I Motor Enabled Enter security passphrase found in user manual Reach section Motor settings Motion Current 0 95 A Step Frequency gt SALIHA E r FF Accelerste 5 Decelerale Standby Current 0 30 A T Overwnite Enable Input Enabled ae i r alee STEP DIR Curent 0 55 A Parente OTT Cea b Figure 13 Motor settings window a Controller with latest firmware and serial number beginning with 5ATT or 6ATT Optimized settings are applied b Controller with outdated firmware or serial number beginning 4ATT applied Safe settings Passphrase understand is entered in security field so motor current can be adjusted Motor Enabled checkbox If unchecked no current flows through the motor windings Default is checked Resolution Stepper motor can be driven in microstepping mode so one motor step can be physically divided into 1 no mic
66. ult the dealer or an experienced radio TV technician for help Read further 5 Altechna is not responsible for any radio television interference caused by modifications of this equipment or the substitution or attachment of connecting cables and equipment other than those specified by Altechna The correction of interference caused by unauthorized modification substitution or attachment will be treated as responsibility of the user Attention Cellular phones or other radio transmitters are not recommended to be used within the range of three meters of this unit since the electromagnetic field intensity may then exceed the maximum allowed disturbance values according to IEC 61326 1 1 5 Operating and storage conditions For proper Watt Pilot functioning please use assigned controller found in the same package Using unassigned controller might be harmful to the device Environmental conditions that must be hold while storing servicing and operating are Storage temperature should be between 25 C and 60 C Operating temperature is 25 C 10 C e Watt Pilot must be protected from humidity dust and corrosive vapors to avoid damaging optical components and electronics e Avoid strong static electricity and electromagnetic fields 2 Operation Principle The motorized Watt Pilot incorporates 2 high performanceBrewster type thin film polarizer s which reflect s polarized light while transmitting p
67. will continue as usual If firmware upgrade window is different than shown here see Troubleshooting chapter on page 38 1 5 Watt Pilot Controller Hardware 5 1 Controller specifications Watt pilot controller isbipolar stepper motor driver with specifications listed in Table 1 below Table 1 Controller specifications Characteristic Rating Max output voltage 12V Max output current 2A Current regulation type Pulse Width Modulation Microstepping capability Full Half Quarter Eight Sixteen steps Step frequency Up to 4 kHz Position feedback Open loop operation no external position feedback encoder Controller protection Driver have overheating and over current 2A protection Device can be operated by e Step Dir pulses e Computer software via USB port e Microcontroller via UART connection Limit switch One limit switch can be connected and used only for homing Advanced feature is STEP DIR INTERFACE connector which enable controller to be used with custom electronics not only computer based applications Microcontroller with UART port or Step Dir signal generator can be connected to D SUB15 connector in order to control motor Computer with USB port Watt Pilot software or self written software can control attenuator or motor Interface logic signal generation Waveplate rotator or ot

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