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WATT PILOT

1. Stop bits 1 Flow conto ES v Restore Defaults Figure 11 COM port properties window In COM port dialog window please choose Bits per second 9600 and flow control None and click Ok Window shown in figure 12 appears Press connect button red circle if needed Type commands to hyper terminal window Commands are listed in chapter IV IV Command set E AE ALTECHNA amp not important HyperTerminal File Edit View Call Transfer Help p OK a 13 d 19 s 6400 wm 4 ws 5 Connected 00 00 13 Auto detect 9600 8 N 1 Figure 12 HyperTerminal control window 4 6 Command set Notation lt n gt integer number 0 255 lt a gt axis name X Y or Z Text in Bold font means the string sent to or received from controller Communication protocol is text based and is case sensitive Command is delimited by new line symbol n r One command line is follower by one response line No data should be sent until response to the command is received Response line starts with OK if command was executed successfully otherwise ERR followed by an error message is sent Commands are described in table Table 1 Command list OK a lt n gt d lt n gt Show current parameter values a S lt n gt wn lt n gt acceleration d deceleration s Speed wm ws lt n gt motion mode power ws standby mode power r aa value in permanent
2. memory me TEY value in permanent memory n oermanent memor wm lt n gt Set motor power Value lt n gt 1 255 for motion mode and store new a in permanent memory ws lt n gt Set motor power value lt n gt 1 255 for standby mode and store new value in permanent memory AE ALTECHNA sk hi Z lt n gt i position m lt a gt lt n gt OK X lt n gt Y lt n gt Move lt a gt axis lt n gt steps relatively to the Z lt n gt current position Response includes coordinates after motion was finished Z lt n gt Response includes coordinates after motion was finished 5 Watt Pilot controller features TTL controller Figure 8 Watt Pilot controller TTL controller version Features e Half stepping e Galvanic isolated inputs e 3 3 V and 5 V tolerant inputs e Input clock step frequency up to 2000 Hz N AE ALTECHNA 5 1 Input signal requirements for TTL version controller Controller inputs are optocoupled it means there are no galvanic connection between power supply and signal source This eliminates any motor generated electrical noise and allows simple controller installation However this requires slightly more current from source but majority of microcontrollers foga are able to drive LED of optocouple directly Input circuit is shown in the figure below To reduce 5 V logic current resistors of 180 Ohm can be added in series with STEP and DIR lines 4 and 5 pins
3. posts and clamps or to the custom system while using M6 screw on the bottom 3 Assembling Figure 3 Assembling the Watt Pilot Watt Pilot assembling steps Step 1 Place polarizers into mechanical adapter Polarizers must face each other with surfaces coated with polarizing coating Polarizing coating is marked with an arrow so you have to put the polarizers with the arrows on the sides facing each other Then fix polarizers with the plastic bolts use all 4 plastic bolts to fix one polarizer NOTICE do not tighten up the bolts too much since it can bend the www altechna com 5 A ALTECHNA polarizer and thus distort the laser beam Step 2 Put wave plate into attenuator between two mounting rings as shown Be sure the wave plate is immobilized tightly Step 3 Attenuator consists of two mechanical parts You should assemble both mechanical parts together Step 4 Use fixing screw for tightening both parts together PEASE NOTICE Powder free gloves must be worn while mounting optical components Avoid touching and scratching optical surfaces 4 Watt Pilot control software USB version controller of Watt Pilot can be controlled via computer using ALT Step software Watt Pilot control software is the automated laser power attenuator solution Main features Simple stand alone controller LASER RELATED COMPONENTS AND TECHNOLOGIES l User friendly software interface Ill High precision IV Simple
4. 2 Motor connector and pin out 6 Watt Pilot electrical mechanical characteristics Watt Pilot electrical and mechanical characteristics are shown in table 3 Table 4 Electrical mechanical characteristics PARAMETER VALUE UNITS 2 Waveplates Holder Angular Resolution 0 01125 deg step Steps Per full Turn 32000 Controller Step Response time response a a S Maximum Frequency of STEP Signal 2000 HE Maximum Controller Power supply Voltage Delay between STEP signal rising edge and current applied to motor windings see table 3 Step frequency can be increased by using more powerful power supply Considering our motor performance noise and heat dissipation 5 V 1 2 power supply is optimal Parameters may vary depending on which controller is used N AE Figure 13 Mechanical dimensions of Watt Pilot 7 Mechanical dimensions ALTECHNA O z Ta O D
5. Configuration 4 3 Configuration Configuration dialog figure 7 allows calibrating attenuator and changing some basic program parameters aJ Configuration D bg Calibration parameters 0 Minimal energy Maximal energy Steps per deg Energy unit 2 fo Stepper parameters Serial port Speed Acceleration Deceleration Standby power 80 300 300 s steps deg 10 0 255 Motion power 0 255 Set current position as home Save ne Figure 7 Configuration dialog Minimal energy Emin and maximal energy Emax values should be measured directly Coefficient k is number of stepper motor steps degree and is provided together with attenuator specification Position in steps should be zero when E Emax Use Set current position as home to reset current position value www altechna com 8 R ALTECHNA Calibration and stepper parameters Energy unit short name of the energy units used Serial port serial port of the PC that is connected to the controller of Watt Pilot Acceleration acceleration of stepper motor when motion is started Deceleration deceleration of stepper motor when motion is finishing Standby power Power applied to the motor when it is not moving It is necessary to decrease the applied power level in order to avoid stepper motor overheating Motion power power applied to the motor while moving 4 4 Keyb
6. are connected to mechanical zero position switch directly Some debouncing circuit may be considered if zero switch is used for example a capacitor in parallel with switch Switch is closed if in zero positions Zero position Switch closed if zero position mn 5 4 OCI 3 RI 560 Ohm 2 R2 560 Ohm Common Cathode DIR STEP CLK ZeroSwitch 1 ZeroSwitch 2 3130 ONUOS OF Mm BR WN Figure 9 Circuit diagram of input section Table 2 Input signal electrical characteristics Input voltage high level 2 8 5 9 V Input voltage low level Input current 2 8 V 3 3 V 5V 5 2 Input signal timing for TTL version controller Motor turns one step after rising edge of STEP signal Proper DIR voltage must be applied before rising edge time t r Rise Fall times of signals do not matter if there are used timings shown in the diagram below Grayed parts in www altechna com A ALTECHNA DIR timeline show moments then DIR level do not matter can be changed and white slots show when DIR level must be kept stabilized It is necessary to mention that motor shaft is inert Frequency of STEP signal must 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 Ang
7. intensity of either exit beam or their intensity ratio can be controlled over a wide dynamic range P polarization could be selected for maximum transmission or high purity s polarization could 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 Watt Pilot output polarization contrast depends on incident laser beam polarization contrast Higher incident laser beam polarization contrast leads to higher Watt Pilot output polarization contrast 2 1 Watt Pilot main components Optical components are placed into mechanical holders Main mechanical components of motorized Watt Pilot are shown in figure 2 Waveplate mount is designed to 1 inch diameter waveplate A 2 Waveplate mount Adapter for polarizers Figure 2 Main components of Watt Pilot www altechna com 4 iy ALTECHNA Wave plate mount is attached to micro step motor Waveplate inside the waveplate holder is rotating around the optical axis of incident laser beam Micro step motor and waveplate mount are shipped together in one piece if there is no other request Brewster type thin film polarizers are placed into adapter for polarizers Polarizers to the mount are fixed using 4 plastic bolts Adapter for polarizers and waveplate mount are fixed while using M4 screw with vinyl cap Watt Pilot might be fixed to an optical table using
8. j ALTECHNA WATT PILOT Motorized Attenuator USER MANUAL www altechna com 1 iy ALTECHNA Table of Contents EON 3 1 1 Walt Pilot Shor descrip ptiO Nissisen 3 1 2 General safety requirements rrrrrrrrrnnnnrrrrrrrrrrnnnnnnrrrrnrrrnnrnnnnnrrnrsnsnnnnnnnrsnnnssnnn 3 1 3 Operating and storage conditions rrrrrrnnnnnvvrrrrrrnrrrrrrrrrnernnnnnnnrrrnrrrrnnnsnssrsennn 3 PET PN seen E E R 4 2 1 Watt Pilot main components ccrdacinsecnwedstecentesanescovsquneucetiusavstoenteacaandenieoemmeancitas 4 a 212 2 9 0 EEE E EEE TENE EE EEEE 5 4 WV All PIG CONTFOL SOMW ANG nie 6 4 1 Software installation ooonnorrrrorrorrornnnnrnnnrerrennnnnrnnnnrseenennnnrnnnnsserennnnnnnnnssennnnnn 6 Be PG GUO E taeda ttn E ATNA E TE 7 BA WO OSI OMIC UES vsceactoc celia cau taeaneaseaninntuast concet EE EN 9 AO NIE Len 12 5 Watt Pilot controller features TTL controller rrrrrrrnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnr 13 5 1 Input signal requirements for TTL version controller rrrrrrrrrrrrrrrrnrrrnnnnnnn 14 5 2 Input signal timing for TTL version controller rrrrrnnnrrrrrrrrrrrnrrrrrnrnonnnnnnnr 14 6 Watt Pilot electrical mechanical characteristics rrrrnnrnrrrrrrrrrrrrrrrrrrononnnnnnnr 16 7 Mechanical GIMENSIONS cece ccccccccceeccceececececeeeeeeeeseeeeeeeeeeseeeseeeeeeeeeeeeeeeeens 17 www altechna com lt R ALTECHNA 1 Introduction This manual is de
9. le deg 0 045 E 0 0225 y K response 0 01125 E 0 i Vor V at wan TAI Vi Vsrep V 128155 stepHIGH Time Figure 10 Input signal timing It is considered that DIR signal is always kept high in this example and angle is increasing on every STEP rising edge Table 3 Input signal timing parameters may vary depending on Watt Pilot version SYMBOL DESCRIPTION MAX UNITS STEP low level duration 0 V 30 4 IN 30 us STEP high level duration lstepHIGH 2 8 V 5 V 00 hen STEP gjer by Time to prepare DIR level before STEP rising edge ey KG DIR pulse width Ss Delay between STEP rising response edge and current applied to motor windings US ns m us US US 5 3 Watt Pilot electrical connections for TTL controller version Figure 11 and figure 12 shows locations of electrical connection Watt Pilot is controlled by a 9 pin D SUB female connector N AE ALTECHNA Input connector pins 1 Common Cathode 2 DIR Input connector Power supply 3 TEMP Pee connector 4 Zero position switch 5 Zero position switch Power supply connector pins 1 Internal pin 2 External pin Figure 11 Input and power supply connectors Not connected 6 1 Motor winding A Not connected 7 KO 2 Motor winding B Not connected 8 oa 3 Motor winding A Not connected 9 0 3 4 Motor winding B 5 Motor winding common Figure 1
10. oard shortcuts For quick manual position tuning several keyboard keys were mapped to the following characters Increase position single step u Decrease position single step j Increase position 10 steps i Decrease position 10 steps k Increase position 100 steps o Decrease position 100 steps I 4 5 Controlling Watt Pilot using HyperTerminal For Windows Vista and Windows 7 HyperTerminal emulator could be used For example Indigo Terminal Emulator First of all COM port used by Watt Pilot soft must be known Procedure described below and shown in picture 8 Right click My Computer 1 Properties 2 Device Manager 3 Ports COM amp LPT 4 Find a port called USB Serial Port in the list Watt Pilot controller box must be connected to PC Remember the number of this port e g COM9 Number of this port is needed also while working with WattPilot www altechna com 9 R ALTECHNA pr an Kr TE O Device Manager File Action View Help i Remote settings Ga gt m ba BE System protection 4h PC Advanced system settings gt gt Batteries b G Bluetooth gt qi Computer gt oa Disk drives b My Display adapters gt i DVD CD ROM drives p 053 Human Interface Devices 1 p G IDE ATA ATAPI controllers gt 4 Imaging devices I gt lt gt Keyboards dg Manage gt Mice and other pointing devices i gt i Monitors fl Scan wi
11. ossible The risk of hazardous 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 Operating and storage conditions Environmental conditions that must be hold while storing servicing and operating are Storage temperature should be between 35 and 60 Operating temperature is 25 10 Waitt Pilot must be pr otected from humidity dust and corrosive vapors to avoid damaging optical components and electronics Avoid strong static electricity and electromagnetic fields www altechna com 3 R ALTECHNA 2 Operation principle Brewster type Reflected s polarization laser beam Rotating M2 waveplate thin film polarizers Incident laser beam Transmitted p polarization laser beam Figure 1 Watt Pilot principle of operation Color differences shows intensity of laser beam Brighter red means more intensive laser beam The Motorized Watt Pilot incorporates 2 high performance brewster type thin film polarizers which reflect s polarized light while transmitting p polarized light Rotating phase retardation of A 2 waveplate 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
12. signed to help to install and operate Watt Pilot This manual is a part of the product Please read instructions of installation and operation carefully before installing and operating Watt Pilot Safety instruction must be read especially careful If there is any questions about contents of this manual please contact Altechna Altechna reserves the right to update contents of the manual without notification 1 1 Watt Pilot short description Motorized Waitt 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 essential in systems where stable laser power adjusting is necessary User friendly software ALT Step or SCA are recommended to control Watt Pilot via PC 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 or integrated into system The customer must use suitable protective measures While assembling or operating Watt Pilot cannot be stared into direct or scattered laser beam All parts of the body must be kept away from the laser radiation While adjusting laser beam path through Watt Pilot laser power must be low as p
13. text based communication protocol V Easy to integrate Attenuatoreontroller ee Se Version 1 0 4 1 Software installation Launch WattPilotSetup exe from USB stick program to install control program Please notice that if you don t have Windows Framework installed you will be prompted to do that Windows Framework can be downloaded from Microsoft web page automatically or alternatively it can be found a copy in USB stick file dotnetfix exe www altechna com 6 R ALTECHNA 4 2 First steps Main window of Waitt Pilot software is called Attenuator and shown in figure 5 In this window there are controls to set energy open Configuration and Direct Control dialogs Using Direct Control dialog user can directly enter position in steps for the stepper motor as shown in figure 6 Attenuator File Tools Help Energy Select m Current m 10 300 Figure 5 Main window of WattPilot Direct Control Position Select 0 step Set position Current Lf step 0 3600 f 7 Figure 6 Direct control dialog Energy that can be changed in main window figure 5 can be determined using equation 1 E Emin Emax Emin cos k j x 1 www altechna com 7 ALTECHNA Eminis the minimal energy Emax is the maximal energy k is the steps per degree ratio and x is current position in steps Calibration procedure is described in chapter IV I
14. th AVG gt Network adapters gt F Ports COM amp LPT Map network drive P gt a Processors Disconnect network drive gt ql System devices D a Sound video and game controllers Create shortcut ter gt amp F Storage controllers gt Universal Serial Bus controllers Rename nce Information and Properties Figure 8 Finding out which USB port is used by Watt Pilot If Windows XP is used HyperTerminal can be found Start gt All Programs gt Accessories gt Communications gt HyperTerminal If HyperTerminal emulator is used please launch from location where it is installed When clicked on HyperTerminal window shown in figure 9 appears Connection Description Enter name and choose an icon for the connection Name not important Figure 9 HyperTerminal connection window In window shown in figure 9 please write in random name and click OK ey AE ALTECHNA Connect Io DB not important Enter details for the phone number that you want to dial Country region Russia 7 Area code 7 Phone number L Connect using COM1 v COM1 COM TCP IP Winsock Figure 10 Choose COM port used by Watt Pilot In window shown in figure 10 please choose COM port used by Watt Pilot COM2 Properties Port Settings Bits per second 9600 Data bits 8 Parity None

WATT PILOT

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