Filter Wheel
Contents
1. If invalid no movement occurs and status byte signals problem aa 3 2 6 Query Position Osc nat y To controller lt 29 gt E si re 1D From controller lt Position Byte gt lt Status Byte gt lt 24 gt Action None la QUERY POSITION will return the present filter position in Position Byte Eg 1 2 3 decimal not ASCII character 1 2 3 32 7 Reset 255 JF m To controller lt 255 gt lt 255 gt Action Filter wheel re homes and goes to filter position 1 From controller Nothing This command effectively does a power on reset resetting the controller board and re homing the wheel It is used when there is suspicion the wheel has lost track of where it physically is in the event ofj jamming for example In normal use this command should not be needed It may however be used periodically for just in case reassurance that the wheel position is correct CVI Laser Corporation Instruments Group AB300 Series User Manual Page 7 Since this command does not return a value knowing when it completes requires an alternate strategy One method is to monitor the CTS line from the filter wheel controller It will be deasserted while the RESET is in progress and asserted when done and ready for another command as is standard for RS232 devices utilizing hardware flow control Another way is to send the ECHO command and wait for the echo byte back If it doesn t come repeat the process This method is prefer2. Page 2 LEA SASE Whee eiyan O O NANO l4 5 3 Cables 5 3 1 Computer to filter whee s 5 3 2 Filter wheel assembly to filter wheel controller 1 DESCRIPTION 1 1 General Description The AB300 Series Automated Filter Wheels consist of a motor driven wheel a computer based controller a power supply and one cable Filter wheel control is provided via RS232 from a host computer to the AB300 Series controller 1 2 Detailed Operation Description The filter wheel assembly has a stepper motor and a position sensing device The motor drives the filter wheel via a belt The position sensing device allows the filter wheel to determine a home position during a reset This home position is some number of steps the offset away from the filter 1 position After home is found the wheel automatically moves to the filter one position The relative position of filter 1 is determined by the Filter 1 Offset stored in non volatile memory From the filter 1 position all other positions are reached by a fixed number of steps and are not individually programmable If fine tuning of each position is desired the Step Up and Step Down commands may be used This fine adjusting will not be saved however and subsequent moves to each position will require re adjusting The filter wheel controller responds to RS232 commands and requires software to control its operation No manual mode of operation is provided 2 OPER
3. 00 Series From DB25 F 8 3 To DB9 M pin 1 2 2 3 20 4 6 6 4 7 5 8 22 9 5 3 2 Filter wheel assembly to filter wheel controller From DB9 F pin To DB9 M pin It is recommended this cable use 26 AWG or larger wire be shielded and not exceed 12 feet in length CVI Laser Corporation Instruments Group AB300 Series User Manual Page 15
4. AB300 Series Automated Filter Wheels User Manual CVI Document 8 2016 A Copyright 1995 CVI Laser Corporation CVI Laser Corporation __ Instruments Group 200 Dorado Place SE P O Box 11308 Albuquerque NM 87192 505 296 9541 Fax 505 298 9908 NOTICES Warranty Hardware i CVI Laser Corporation warrants this product to be free from defects in material and workmanship for a period of one year from the date of purchase Warranty Software Any software associated with this product is provided as is with no warranty expressed or implied While it is CVI Laser Corporation s intent to provide error free useful development tools no guarantee is made regarding the accuracy or ultimate usefulness of this material Included Software Any software distributed with this product is provided free of charge as a service to the customer The software is intended to be used as a tool for development and as an example of one possible method of code implementation It is not intended to be a user application Software Copyright CVI maintains the copyright on this lar but grants the customer rights to use or modify the software described herein without obtaining CVI s permission and without the requirement to reference CVI as the source of material Changes CVI reserves the right without prior or further notice to make changes to any of its products described or referred to herein to improve reliability f
5. ATION 2 1 Mounting Mounting of the wheel itself is via 1 4 20 threaded holes if provided located on the sides of the filter wheel housing or via a mounting flange or flanges on the front and or back of the housing Due to the vast possibilities of mounting arrangements custom modification of the filter wheel housing may be necessary Modified hardware will not be accepted by CVI for full refund If replacement is deemed necessary CVI will try to re use modified parts but is under no obligation to duplicate customer custom modifications Mounting hole patterns and flange dimensions are provided in Specifications Mechanical CVI Laser Corporation Instruments Group AB300 Series User Manual Page3 2 2 Filter Installation Access to the filters is provided by removing four screws to remove the cover of the filter wheel housing Filters may be held in place by whatever means suit the customer s application A popular method is to use small dabs of silicone RTV on the edge of a filter to tack the filter in place 2 3 Connections The filter wheel housing to filter wheel controller connection is made via a DB9 F to DB9 M cable CVI pn DK12AT provided The connection is from the controller port To Filter Wheel to the filter wheel housing The host computer to filter wheel controller connection is made via a standard RS232 cable not a Null Modem type to the RS232 Jn port on the filter wheel controller Th
6. able only if hardware flow control isn t available 3 2 8 Step Down To controller lt I gt 3 Action Wheel moves one motor step toward next lower position From controller lt Status Byte gt lt 24 gt Used to fine adjust the current position For filter one it may be used preceding a ZERO command to set the default filter one position 3 2 9 Step Up To controller lt 7 gt 2 Action Wheel moves one motor step toward next higher position From controller Status Byte gt lt 24 gt 3 2 10 4 OPERATION HINTS Used to fine adjust the current position For filter one it may be used preceding a ZERO command to set the default filter one position Zero Px hap To controller lt 52 gt Do 5 Y Action Current position is saved as filter one default location From controller lt Status Byte gt lt 24 gt Sets the default filter one position All other filter positions are derived from this location The wheel must be set to filter one position prior to issuing this command CAUTION Failure to select filter one position prior to using this command may cause erratic or unpredictable results including failure to operate Care and discretion is advised Using RESET to close the loop on position As part of the power on reset the filter wheel finds home by sensing a switch closure This switch sensing is the only feedback the wheel gets regarding actual physical position From that point on the wheel is contr
7. e power supply connects to the filter wheel controller at the Power jack 3 PROGRAMMING 3 1 Overview The AB300 Series controller responds to software commands via the RS232 line This communication may come from any device capable of RS232 utilizing any language and operating system The AB300 Series controller is a DCE device and uses the following protocol 8 Data bits 1 Stop bit No Parity Baud is user programmable factory shipped configured at 9600 Flow control is via hardware handshaking utilizing CTS and RTS Hardware handshaking for the AB300 Series controller is employed as follows _ CTS from controller to host signals if the controller is ready to receive a byte over the RS232 line If the CTS line is asserted ie a positive voltage the controller is ready to receive If a byte s is sent while CTS is deasserted ie a negative voltage the character may be lost As the AB300 Series controller has a one character input buffer multiple characters or commands cannot be received and stored Since CTS held deasserted while the filter wheel is executing a command the reassertion of CTS signals that the command has completed RTS from host to controller signals if the host is ready to receive a byte s from the controller The AB300 Series controller does check this handshaking line and will wait CVI Laser Corporation Instruments Group AB300 Series User Manual _ Page 4 indefinitely for RTS to be asserted bef
8. ge used Refer to the sample programs for examples For commands that return a Status Byte that byte is interpreted as follows 7 MSB 0 if command accepted 1 if value specified current value IS 0 value too high 1 value too low ignore if bit 7 0 5 4 0 moving to lower filter 1 moving to higher filter Not used The commands and their protocol are described as follows in alphabetical order Pee boo 3 2 1 Baud AM 3 To controller lt 58 gt lt Baud Rate Byte 55 7 A From controller lt Status gt lt 24 gt Action Communication baud rate switched to new rate after lt 24 gt sent CVI Laser Corporation Instruments Group AB300 Series User Manual Page 5 Baud rate bytes are as follows Byte Baud Byte Baud o 9600 4 600 1 4800 S 300 2400 6 150 3 100 EE Note The controller saves the last selected baud rate and will use that rate at the next power on or RESET Therefore the user must also remember the last baud rate Powering the AB300 Series controller off then on will not reset the baud rate 3 2 2 Echo bs To controller lt 27 gt R D y From controller lt 27 gt P Action None The ECHO command is used to verify communication ho 3 23 EEPROM Read 66 BF To controller lt 56 gt lt Address Byte From controller Data High Byte gt lt Data Low Byte gt lt Status Byte gt lt 24 gt Action None Reads the word two bytes value curren
9. n AB300 Series User Manual Page 11 Instruments Group 5 1 3 AB302 Threaded Flange CVI pn 0 2009 0 594 za Threaded flange is Thorlabs 2 tube compatible AR CVI Laser Corporation AB300 Series User Manual Page 12 3 750 fk 2 85 3 23 Instruments Group b 5 2 Electrical 5 2 1 RS232 In ppm RD From controller to computer From computer to controller 3 From computer to controller 8 CTS From controller to computer The AB300 Series controller RS232 port a DCE device should be connected to a computer DTE device via a standard straight through cable not a null modem type Connector is numbered 5 2 2 Power 5 2 2 1 AB301 Tip 5 VDC Shaft Return 5 2 2 2 AB302 Center 12 VDC Outside Return CVI Laser Corporation Instruments Group AB300 Series User Manual _ Page 13 dB 5 2 3 Filter Wheel Pin out applies at wheel assembly and controller Connectors are numbered 1 Motor Coil Blue Motor Coil Red Motor Coil Yellow Motor Coil White Motor Coil Green Home Contact E HomeConact 35 Ne 5 3 Cables 5 3 1 Computer to filter wheel RS232 RS232 DB9 F to DB9 M CVI pn DK12AT for 9 pin serial DTE to AB300 Series From DB9 F pin To DB9 M pin CVI Laser Corporation AB300 Series User Manual Instruments Group Page 14 RS232 DB25 F to DB9 M for 25 pin serial DTE to AB3
10. olled open loop If CVI Laser Corporation Instruments Group AB300 Series User Manual Page 8 for any reason e g the wheel jams or becomes disconnected the wheel looses its position it will not be able to tell a problem exists It may be desirable or at least reassuring to close the loop by having the wheel re find its home position This is done by issuing the RESET command Using QUERY position After power on or the RESET command a filter wheel goes to the filter one position All subsequent movements from there are done by issuing FILTER commands So theoretically at least the controlling software should always know the current filter position of any filter wheel Still it may be reassuring to query the filter wheel controller to verify what it thinks is the current position matches what the controlling software thinks This is done with the QUERY command Note the filter wheel is positioned open loop and cannot tell if a malfunction has prevented the wheel from reaching its desired target For example if a wheel became unplugged from the controller no error would occur using FILTER commands and a QUERY would return the intended position not the actual filter position which is long lost Only the RESET command will detect the problem by failing to home Fine tuning each position Only the filter one position has a programmable fine tuning adjustment that is saved For filter one position only this i
11. ore sending a character For this reason the host system must ensure RTS is asserted for the filter wheel to work properly Proper handling of hardware handshaking is vital to smooth operation Each programming language has different methods and defaults for this protocol which must be understood by the programmer The filter wheel controller is designed to be the sole device on an RS232 line If multiple devices are desired and com ports are not available a serial port switch box may be used contact CVI for details and suggestions on multi filter wheel systems 3 2 Commands The communication to and from the controller utilizes bytes 8 bits sent as characters the reason for 8 data bits per character Each command consists of one or more bytes characters to the controller Depending on the command one or more bytes may be returned by the controller to return data or signify the end of a command Commands should be sent as indicated without sending terminating characters for example do not send carriage return at the end of each command Undesired characters may have an adverse affect on controller operation For the following a value surrounded by angle brackets lt gt is the decimal base 10 value of byte transmitted Typical programming practice would be to send and receive these bytes as ASCII characters converting them to a decimal value as needed by other programming tasks How this is done is dependent on the langua
12. s done by using STEP UP and STEP DOWN then issuing a ZERO command to store the setting All other filter positions are a fixed number of steps from the filter one position Fine tuning of each filter position may be accomplished using software techniques The process is to go to a filter position then issue STEP UP DOWN commands to fine tune the position The number of STEP UP DOWN commands needed must be handled saved by the controlling software Each time that position is to be recalled a FILTER and the appropriate number of STEPs would be issued Note Adjusting a position using STEPs does not affect the base position of subsequent positions E g Using 3 step up commands for filter 2 does not make the subsequent filter 3 position off by 3 steps CVI Laser Corporation Instruments Group AB300 Series User Manual Page 9 5 SPECIFICATIONS 5 1 Mechanical 5 1 1 AB301 Slit Aperture 2 04 0 97 4 375 Male Flange CVI pn 4 0367 46 32 4 ples 2 187 Female Flange CVI pn 4 0352 A o Not to Scale CVI Laser Corporation Instruments Group AB300 Series User Manual Page 10 5 1 2 AB301 Clear Aperture 5 500 6 32 2 ples HU Threaded Flange 9 CVI pn 0 2010 Thin cover Thick cover qus See below for hole pattern TN F 4343 El 0 491 6 32 2 ples S Not to Scale m Threaded flange is Thorlabs 1 tube compatible CVI Laser Corporatio
13. tly stored iri EEPROM non volatile memory at the specified address 0 15 The two returned data bytes form a word as follows lt Data High Byte gt x 256 lt Data Low Byte gt Word 3 2 4 EEPROM Write CAUTION Improper or indiscriminate use of this command may impair the functionality of the instrument Caution and discretion is advised oi ee To controller lt 59 gt lt Address Byte gt lt Data High Byte gt lt Data Low Byte gt lt Checksum Byte gt Action Data written to EEPROM address From controller lt Status Byte gt lt 24 gt Writes a word two bytes to the EEPROM non volatile memory at the specified address 0 15 The value of the word is given by CVI Laser Corporation Instruments Group AB300 Series User Manual Page 6 lt Data High Byte gt x 256 lt Data Low Byte gt Word y The Checksum Byte must be correct for the write to be allowed and is determined by Address Data High Byte Data Low Byte Checksum where Checksum is a byte long truncated if necessary and any carry is ignored If the checksum byte is not correct the command will be IGNORED no status or lt 24 gt will be sent This command is normally not used except at the factory 3 2 5 Filter To controller lt 15 gt lt Position Byte gt Action Filter wheel moves to specified position From controller lt Status Byte gt lt 24 gt Valid positions are 1 through 5 If position is valid the wheel turns to the new position
14. unction or design Liability CVI accepts no liability for incidental or consequential damages arising from the use of this product CVI Laser Corporation does not recommend the use of its components or software products in life support applications wherein a malfunction or failure of the product may directly threaten life or result in injury ANT CVI Laser Corporation Instruments Group AB300 Series User Manual Page le TABLE OF CONTENTS DESCRIPTION er 3 1 1 General Description amonia iye e aaia E e A DS 3 1 2 Detailed Operation Description csssssseserssssesssssssssesessscenecsscssssuenessssssesssssssrsssnesessenseesssssesresasseaceeseeseetseseseeeen 3 2 OPERATION ERE 3 AAA EEN 3 2 2 Filter Installation AT a o i eee RENI 4 o y 3 PROGRAMMING 3 1 Overview 4 3 2 Commands 3 2 1 Baud 3 2 2 Echo 3 2 3 EEPROM Read 3 2 4 EEPROM Write 32 5 Filter sees 3 2 6 Query Position 3 2 7 Reset eJ 3 2 8 Step Down 3 2 9 Step Up 3 2 10 Zero 4 OPERATION HINTS ccccccccccctscecceseeascesenssenscessereseccecesnseecesususeesenesenescuscaresseenenensssenees 8 5 SPECIFICATIONS iosa 10 5 1 Mechanical 5 1 1 AB301 Slit Aperture 5 1 2 AB301 Clear Aperture 5 1 3 AB302 5 2 Electrical 5 2 1 RS232 In 5 2 2 Power 5 2 2 1 AB301 5 2 2 2 AB302 CVI Laser Corporation Instruments Group AB300 Series User Manual
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