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Lambda SC
Smart
Shutter
®
Control System
Operation Manual
Rev. 1.14c ( 20190606)
One Digital Drive
Novato, CA 94949
Voice: 415-883-0128 Web: www.sutter.com
Fax:
415-883-0572 Email: info@sutter.com

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  • Page 1 Lambda SC Smart Shutter ® Control System Operation Manual Rev. 1.14c ( 20190606) One Digital Drive Novato, CA 94949 Voice: 415-883-0128 Web: www.sutter.com Fax: 415-883-0572 Email: info@sutter.com...
  • Page 2 Copyright © 2019 Sutter Instrument Company. All Rights Reserved. Smart LAMBDA 10 ® Shutter ® are registered trademarks of Sutter Instrument Company. LAMBDA SC OPERATION MANUAL – REV. 1.14C (20190606)
  • Page 5: Table Of Contents

    TABLE OF CONTENTS 1. GENERAL INFORMATION ......................1 1.1 About This Manual ........................... 1 1.2 Technical Support ..........................1 2. SAFETY WARNING ........................3 2.1 Safety Considerations when Using High-Intensity Light Sources ..........3 Smart 2.2 The Shutter is Not a Safety Shutter ..................3 3.
  • Page 6 9. MANUAL CONTROL ........................23 10. REMOTE CONTROL ........................25 10.1 Input Command Structure ......................25 10.2 Input Command Structure ......................25 10.3 Shutter Commands ........................29 10.3.1 Open Shutter .......................... 29 10.3.2 Close Shutter .......................... 29 10.3.3 Fast-Mode Shutter ......................... 29 10.3.4 Soft-Mode Shutter ........................
  • Page 7 12.1.1 Installation Steps ........................45 12.1.2 Interactive USB Device Driver Installation (Windows Only) ........... 47 12.2 Installing the USB Interface for Non-Windows Systems ............49 12.3 Verifying USB Communication Between Remote Computer and Lambda SC ..... 49 12.4 Uninstalling the USB Driver for the Lambda SC ..............51 13.
  • Page 8 Figure 12-3 -- Host connector end of USB cable................... 46 Figure 12-4 -- USB host receptacle on remote computer..............46 Figure 12-5 -- New USB device detected message box................. 47 Figure 12-6 -- Digital Signature dialog box.................... 47 Figure 12-7 -- Specifying location of driver files.
  • Page 9: General Information

    Support staff with your suggestions (415-883-0128 or info@sutter.com). 1.2 Technical Support Unlimited technical support is provided by Sutter Instrument Company at no charge to our customers. Our technical support staff is available between the hours of 8:00 AM and 5:00 PM (Pacific Time) at (415) 883-0128.
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  • Page 11: Safety Warning

    Smart 2.2 The Shutter is Not a Safety Shutter Smart Sutter Instrument Co.’s Shutter is intended to be a ‘safety shutter.’ A safety shutter usually closes automatically in the event of a power failure and is designed with the primary goal of ensuring that it will not allow any unintended exposure. For laser safety...
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  • Page 13: Precautions

    3. PRECAUTIONS 3.1 On Operation Failure to comply with any of the following precautions may damage this device. • DO NOT CONNECT OR DISCONNECT THE CABLES BETWEEN THE CONTROLLER AND THE MECHANICAL UNITS WHILE POWER IS ON. Please allow at least 20 seconds after turning the unit off before disconnecting the mechanical units.
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  • Page 15: Accessories

    Instrument Co. This post, along with posts of other dimensions, as well as post holders and bases, are available from most laboratory equipment suppliers. A SmartShutter can also be mounted on a Sutter Instrument Co. Filter Wheel with a special enclosure, as well as with other Sutter Instrument Co. products, such as the Lambda LS, Lambda DG-4, Lambda DG-5, and various Lambda 10 series Filter Wheel controllers.
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  • Page 17: Unpacking

    5. UNPACKING The Lambda SC and associated hardware comes packed in a single carton. The following is a list of the components found there. If you believe that any of these components are missing or show obvious signs of damage from shipping, please contact the factory. ...
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  • Page 19: First Time Use

    6. FIRST TIME USE 6.1 Some Basic Information The Lambda SC is a microprocessor-controlled, high-speed shutter controller designed for microscopy and other applications that require rapid and accurate wavelength switching. The Lambda SC controller can control one SmartShutter and features a USB input for remote control.
  • Page 20: Line Power (Mains)

    6.2 Line Power (Mains) The power cord provided with the Lambda SC connects to the Power Entry Module located on the back of the unit (see diagram below). This Module also includes the Line Fuse and Power Switch. Figure 6-1. Lambda SC cabinet (rear view) Figure 6-2.
  • Page 21: Make It Go

    Utility software after having installed the USB device driver. Additionally, the open/closed state of the SmartShutter can be controlled by connecting a triggering signal to the TTL Input connector on the rear of the Lambda SC box. 6.5 Make It Go 1.
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  • Page 23: Smart Shutter

    SMART SHUTTER Smart Shutter is a lightweight motor-driven aluminum vane under microprocessor control. Because of the microprocessor control, the motion of the vane can be tailored for different roles. The vane starts and stops under motor control, eliminating the sharp jolt typical of other fast shutters.
  • Page 24: Modes

    In this mode the user selects the extent to which the shutter opens. When used with the Sutter Instrument light guide system (LLG), this allows the light output from the light guide to be attenuated without changing its wavelength or spatial distribution.
  • Page 25: Opening And Closing Times

    SmartShutter When a 35 mm is to be mounted to a 32 mm Lambda 10 filter wheel, a special SmartShutter adapter threads into the filter wheel T-mount and the mounts on this piece. SmartShutter The 35 mm has a receptacle for the flange on the end of this T-mount tube and SmartShutter this allows the to mount to the flange on the end of the tube in many different...
  • Page 26: Repetition Rates And Duty Cycle

    the number of steps selected. For a complete opening of 144 steps, the time to open and the time to close will each be about 38 msec. The time required will be approximately proportional to the number of steps, or about 2.6 msec per 10 steps. 7.3.3 Repetition Rates and Duty Cycle Operation does not require over-driving the motor windings, so the motor windings are not damaged by frequent opening and closing over long time periods.
  • Page 27: Controller

    8. CONTROLLER 8.1 Principles of Operation The Lambda SC controller is operated remotely from a computer through the USB port. Remote operation allows the user to select:  Shutter position  Shutter mode The remainder of this chapter provides a detailed description of the controller’s rear panel connectors and front panel controls.
  • Page 28: Ttl Input And Output

    NOTE: The RS-232 serial port is absent on early versions of the Lambda SC controller. If you have a version of the Lambda SC that does not have the serial port, and you would like to have it added, please contact Sutter Instrument Co. to arrange for an upgrade. 8.2.4 TTL Input and Output Two BNC receptacles are provided for TTL control of the connected SmartShutter.
  • Page 29: Power Light

    Lambda SC controller. If you have a version of the Lambda SC that does not have the switch, and you would like to have it added, please contact Sutter Instrument Co. to arrange for an upgrade.
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  • Page 31: Manual Control

    9. MANUAL CONTROL Manual control of the Lambda SC and the attached SmartShutter can be achieved by one of two means: Toggle switch on the front panel of the Lambda SC cabinet. A foot switch (or other switching device) attached to the TTL IN receptacle on the rear of the Lambda SC cabinet.
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  • Page 33: Remote Control

    10. REMOTE CONTROL The remote control of the Lambda SC can be achieved by issuing commands on a remote computer and transmitting them to the Lambda SC over a USB (Universal Serial Bus) or RS- 232 serial connection. This chapter provides a description of these commands and how they are used.
  • Page 34: Table 10-2. Remote Control Commands

    Table 10-2. Remote control commands Command Value Description (Decimal, hexadecimal, & binary) Open Shutter Sets the state of the shutter to open. 10101010 Close Shutter Sets the state of the shutter to closed. 10101100 Stop the Free Stops the Free Run if it is currently running. 10111111 Status Returns status of unit in two bytes...
  • Page 35 Command Value Description (Decimal, hexadecimal, & binary) byte, upper nibble: 1s digit (0-9) for milliseconds; lower nibble: 0.1s digit (0-9). Set Exposure 250 + (32 – 37) + 4 Sets the time to when the shutter opens (0 through 5 Timer bytes hours even (or 4 hours, 59 minutes, 59 seconds, 999.9...
  • Page 36 Command Value Description (Decimal, hexadecimal, & binary) Controller to the factory default. FA + C0 Factory-Default 11111010 + Configuration 11000000 Save the Current 250 + 193 Saves the current configuration to the controller. This Configuration to saved configuration will be used next time the FA + C1 the Controller controller is powered up or is reset.
  • Page 37: Shutter Commands

    The microprocessor in the controller is programmed to distinguish between these two types of Input Commands based on the bit pattern of the Command and will respond accordingly. These two types of Commands are discussed in more detail in the following sections. 10.3 Shutter Commands Shutter commands are described in the following table, along with the decimal, hexadecimal and binary values that encode them.
  • Page 38: Neutral Density Mode Shutter

    10.3.5 Neutral Density Mode Shutter SmartShutter Sets the mode of the specified shutter to NEUTRAL DENSITY ( only). The command ends with a second byte, which contains a value of 1 through 144 indicating the number of microsteps. 10.4 Special Commands Special commands are those that are not specifically related to the control of shutters.
  • Page 39 Command Value Description (Decimal, hexadecimal, & binary) Set Exposure 250 + (32 – 37) Sets the time to when the shutter opens (0 through 5 hours Timer + 4 bytes even (or 4 hours, 59 minutes, 59 seconds, 999.9 milliseconds + 0.1 millisecond).
  • Page 40 Command Value Description (Decimal, hexadecimal, & binary) FA + B2 11111010 + 10110010 Restore Controller 250 + 192 Changes the controller’s configuration to that of the factory to the Factory- default. FA + C0 Default 11111010 + Configuration 11000000 Save the Current Saves the current configuration to the controller.
  • Page 41: Status

    The following paragraphs describe the special commands in more detail. 10.4.1 Status The Status command is used to return information about the state and mode of the attached SmartShutter. Table 10-5. Status command return codes and data Order Category Byte Value Description Num.
  • Page 42 Order Category Byte Value Description Num. (Decimal, hexadecimal, & binary) Lead-in byte for 4/(5) Lead-in byte for all Lambda SC-specific Lambda SC special commands (TTL IN, TTL OUT, Special commands Timers, and Free Run). This lead-in byte is 11111010 (1 byte) expressed only once in the status return data structure, and this is where it occurs.
  • Page 43 Order Category Byte Value Description Num. (Decimal, hexadecimal, & binary) 8/(9) 0 – 59 Minutes: (0 – 59) 00 – 38 00000000 - 00111011 9/(10) 0 – 59 Seconds: (0 – 59) 00 – 38 00000000 - 00111011 10/(11) 0 – 9 Milliseconds 100s Digit (Upper Nibble): 0 –...
  • Page 44: All Motors Power On

    Order Category Byte Value Description Num. (Decimal, hexadecimal, & binary) 0 – 9 Milliseconds 10s Digit (Lower Nibble): 0 – 9. x0 – x9 xxxx0000 –xxxx1001 16/(17) 0 – 9 Milliseconds 1s Digit (Upper nibble): 0 – 9. 0x – 9x 0000xxxx –...
  • Page 45: Transfer To On Line

    10.4.4 Transfer to On Line This command is the equivalent to pressing the ON LINE key on the Lambda SC’s keypad. If the controller is in local mode (i.e., it is off line), this command will cause the controller to go on line (the opposite of local mode), enabling it to respond to other commands from the remote computer.
  • Page 46: Ttl In Pulse Trigger Disabled

    Byte Byte Value Upper & Description Num. Lower (Decimal, hexadecimal, & binary) Nibble Values (Decimal, hexadecimal, & binary) 0 – 9, 16 – 25, 32 – 41, 48 – 57, 64 – 73, 80 – 89, 0 – 9 96 – 105, 112 – 121, 128 – 137, 144 – 153. Milliseconds: 100s digit (0 0 –...
  • Page 47: Ttl In Falling Edge Triggers Smartshutter To Toggle

    10.4.12 TTL IN Falling Edge Triggers SmartShutter to Toggle On the falling edge of the signal coming in on TTL IN, the shutter opens if closed or closes if open (toggles its state). 10.4.13 TTL OUT Synch Signal Disabled Disables the synchronization signal on TTL OUT. 10.4.14 Opening Shutter Sets TTL OUT to High When the shutter goes to the open state, the synchronization signal on TTL OUT goes high.
  • Page 48: Get Controller Type And Configuration

    10.4.23 Get Controller Type and Configuration This command is used to obtain information about the controller as to its model and configuration. The following table shows the type of information returned when issuing this command. Table 10-7. "Get Controller Type and Configuration" command return codes and data Configuration Total Description...
  • Page 49: Smartshutter Movement Errors: Causes And Solutions

    SmartShutter 10.6 Movement Errors: Causes and Solutions The SmartShutter is optimized for the fast shutter action. One element of the SmartShutter’s overall design that contributes to its superior performance is the acceleration and deceleration profiles that are pre-programmed into the microprocessor commanding the motor.
  • Page 50: Preparing The Command Byte

    10.7.1 Preparing the Command Byte All remote control command codes for the Lambda SC require no more than one byte (8 bits) of storage for each command. If using a programming language that make a distinction between unsigned and signed bytes, always select unsigned only. “Unsigned” means that only positive numbers can be stored, whereas “signed”...
  • Page 51: Remote Control: Serial Port

    NOTE: The RS-232 serial port is absent on early versions of the Lambda SC controller. If you have a version of the Lambda SC that does not have the serial port, and you would like to have it added, please contact Sutter Instrument Co. to arrange for an upgrade. 11.1 Connecting to the Serial Port The serial interface connector on the back of the Lambda SC controller cabinet is a DB-9 female connector.
  • Page 52: Input Command Set And Protocol

    Communication for the serial port requires the following settings:  Baud rate 9600  Data bits  Parity none  Stop bits  Flow Control: none No hardware control lines are connected. You must either set the communication mode so that these lines are ignored or provide connections that will satisfy the mode of communication that you use.
  • Page 53: Remote Control: Usb Port

    12. REMOTE CONTROL: USB PORT The Lambda SC can communicate with the computer via the Universal Serial Bus (USB) port instead of the SERIAL (RS-232) port whenever it is connected to the remote computer with a USB cable and the appropriate USB device drivers are installed. The remote computer must be equipped with the necessary USB hardware and its operating system must be properly configured to recognize and work with the USB interface.
  • Page 54: Figure 12-1 -- The Usb Cable Device Connector

    shape is the one that connects the USB device. The device connector is shown in the following figure. Figure 12-1 -- The USB cable device connector. 3. And the receptacle in the rear of the Lambda SC into which the “device” connector of the USB cable connects is shown in the following figure.
  • Page 55: Interactive Usb Device Driver Installation (Windows Only)

    Windows may also automatically install the appropriate drivers if another Sutter Instrument Company instrument with a USB interface (such as a Lambda 10-3, a Lambda 10-B, an MPC-200, or even another Lambda SC) is already connected and configured with your computer.
  • Page 56: Figure 12-7 -- Specifying Location Of Driver Files

    Do not be concerned that Windows is unable to find a Microsoft digital signature for the Lambda SC as shown in the previous figure. Simply press the “Yes” button to continue to the next step. The next figure shows the dialog box that Windows displays when it is ready ask you for the location of the Lambda SC USB device drivers.
  • Page 57: Installing The Usb Interface For Non-Windows Systems

    Figure 12-8 -- Browsing for the driver file needed. Once the requested files are located, the Windows USB device installer will complete. Note that you may need to cycle through the two dialogs shown in the last two figures before the requested file is located and installed. This completes the description for installing the Lambda SC as a USB device connected to a Windows system.
  • Page 58: Figure 12-9 -- Usbtest Main Screen

    testing is to install and run on the remote computer the USB Test and Demo program for the Lambda 10-series (a Windows program). This program is called “USBTest”, and once installed, can be used to determine if the remote computer is able to communicate with the Lambda SC as a USB device.
  • Page 59: Uninstalling The Usb Driver For The Lambda Sc

    copied to the text field associated with the Search button. Finally, click the Open button to open the Lambda SC USB device for communication. The text field associated with the Open button will be updated with a message indicating that the USB device has been successfully opened.
  • Page 60 5. If the uninstall process completed, the FTD2XX entry in the Add/Remove list should now be gone. Note that although the above procedure will remove the Lambda SC USB device driver from active use, not all related files on your system are actually deleted. Should you decide to reinstall the USB driver for the Lambda SC after having gone through the uninstall process, Windows will most likely be able to locate the necessary USB driver file on your system during the installation process, without requiring you to supply the disk containing the...
  • Page 61: Remote Control: Logic Level (Ttl) Input For Shutter Control

    13. REMOTE CONTROL: LOGIC LEVEL (TTL) INPUT FOR SHUTTER CONTROL In addition to the control of the shutter via the USB port and the serial port, the direct TTL logic input can also control the shutter. However, input must be selected and configured for the mode desired.
  • Page 62: Table 13-1. Commands For Pc Parallel Port Control Of Smartshutter Via Ttl In

    Table 13-1. Commands for PC parallel port control of SmartShutter via TTL IN PC Parallel Port Pin 14 Byte value TTL level High LAMBDA SC OPERATION MANUAL – REV. 1.14C (20190606)
  • Page 63: Paired Shutters For Short Exposure Times

    14. PAIRED SHUTTERS FOR SHORT EXPOSURE TIMES The coordinated movement of two shutters in series in the optical path can be configured to produce shorter exposure times than is possible with a single shutter. A single shutter will require about 8 msec with the shutter completely open before the shutter blade can start covering the aperture.
  • Page 64 programmed to be normally open at power on and to trigger on the falling edge of the TTL signal. This can be done using the Lambda SC utility. LAMBDA SC OPERATION MANUAL – REV. 1.14C (20190606)
  • Page 65: Maintenance

    15. MAINTENANCE Routine cleaning of the Lambda SC system is required to prevent excessive dust accumulations – wipe all exterior surfaces with a dry, soft, cotton cloth. All retaining rings should be inspected occasionally to be certain that they are seated into the filter holders and cups.
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  • Page 67: Appendix A. Stepping Motor Operation

    APPENDIX A. STEPPING MOTOR OPERATION Stepping motors are not as familiar to most people as the common DC motor, but there are some similarities. The DC motor consists of an armature, an electromagnet mounted on a rotating shaft, which is located inside a permanent magnet. Current is supplied to the electromagnet through brushes that rub on contacts on the armature.
  • Page 68 control electronics, the resulting move may differ from that commanded by the control electronics. For instance, if enough external force is applied, the motor shaft may be rotated even though the command signal has not changed. For small rotations (less than 3.6 degrees), the motor shaft will return to the correct position if the force is removed.
  • Page 69: Appendix B. Fuse Replacement

    Replace the active fuse with the spare and re-install the fuse holder and power cord. If the controller fails to power up with the new fuse installed, call Sutter Instrument technical support personnel for assistance.
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  • Page 71: Appendix C. Mounting A Smart Shutter In A Lambda Ls

    SMART APPENDIX C. MOUNTING A SHUTTER IN A LAMBDA LS Smart The one-inch stand-alone version of the Shutter can be mounted inside current versions of the Lambda LS. A male-to-male c-mount adapter is used to couple the Smart Shutter to the c-mount block inside the Lambda LS. Stacking c-mount extension tubes Smart are threaded into the other side of the Shutter to provide an enclosed light path from...
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  • Page 73: Appendix D. Disclaimer

    Do not allow unauthorized and/or untrained operatives to use this device. Any misuse will be the sole responsibility of the user/owner and Sutter Instrument Company assumes no implied or inferred liability for direct or consequential damages from this instrument if it is operated or used in any way other than for which it is designed.
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  • Page 75: Appendix E. Limited Warranty

    APPENDIX E. LIMITED WARRANTY Sutter Instrument Company, a division of Sutter Instrument Corporation, limits the warranty on this instrument to repair and replacement of defective components for one year after the date of shipment, provided the instrument has been operated in accordance with the instructions outlined in this manual.
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  • Page 77: Appendix F. Technical Specifications

    APPENDIX F. TECHNICAL SPECIFICATIONS Dimensions (H x W x D): Controller 5.38” x 5.86” x 8.25” 13.67 cm x 14.88 cm x 20.96 cm SmartShutter 25 mm (1”) Height (from motor top to shutter bottom): 3.88” H 9.86 cm H Width and depth: Motor end (top): 1.06”...
  • Page 78: Table F-1. Lambda Sc Controller Cables

    SmartShutter 35 mm 0.75 lb (12 oz) 0.34 kg Electrical: Input voltage (Mains) 115 V , 60 Hz 230 V , 50 Hz Mains fuse (rear of cabinet) 5 x 20 mm glass tube, T1.0A, 250V , IEC 60127-2, Sheet III (such as a Bussmann GDC-1A or Littelfuse 218 001) Power cord 10A, 250V , with safety ground plug...
  • Page 79: Appendix G. Remote Control Command Reference

    APPENDIX G. REMOTE CONTROL COMMAND REFERENCE This appendix provides a complete list of remote control commands and return values. Table G-2. Complete Lambda SC remote-control command reference Dec. Hex. Bin. Description 00000000 10101001 10101010 Open Shutter 10101011 10101100 Close Shutter A 10101101 10111110 10111111...
  • Page 80 Timer, TTL control, configuration (2- or more-byte) commands: Followed by: Description: Num. Sub-Command (2 Byte) Dec. Hex. Bin. bytes 00000000 – – 00001111 Set Delay Timer for 0 – 5 hours (hours specified in lower nibble (4 bits)), followed by 4 bytes specifying (in order) minutes (0 –...
  • Page 81 Set repeat cycle numbers for Free Run. Followed by two bytes containing the number of repeat cycles. Both bytes are treated as a single 16-bit “word” type, thereby allowing from 0 to 65,535 11110000 possible values. Any value over 65,000 (65,001 – 65,535), however, sets the Free Run to continuous (cycles repeat forever until the Stop Free Run command is issued).
  • Page 82: Table G-3. Timer Command Time Encoding

    Table G-3. Timer command time encoding Byte Byte Value Upper & Description Num. Lower (Decimal, hexadecimal, & binary) Nibble Values (Decimal, hexadecimal, & binary) (Not Lambda SC Special relevant) Command. 1111 1010 1 - 2 1 = Set Delay Timer 1 - 2 2 = Set Exposure Timer 10 –...
  • Page 83: Table G-4. Status Command Return Codes And Data

    Table G-4. Status command return codes and data. Order Category Byte Value Description Num. (Decimal, hexadecimal, & binary) Command echo The Status command byte code echoed back. (1 byte) 11001100 Shutter Open: Shutter is in the opened state. Open/Closed State (1 byte) 10101010 Closed: Shutter is in the closed state.
  • Page 84 Order Category Byte Value Description Num. (Decimal, hexadecimal, & binary) TTL IN Setting 5/(6) Disabled: Trigger/toggle control of the (1 byte) shutter via TTL IN is turned off. 10100000 Trigger on High: Shutter is normally closed; opens while high signal is present on TTL 10100001 Trigger on Low: Shutter is normally open;...
  • Page 85 Order Category Byte Value Description Num. (Decimal, hexadecimal, & binary) 10/(11) 0 – 9 Milliseconds 100s Digit (Upper Nibble): 0 – 0x – 9x 0000xxxx – 1001xxxx 0 – 9 Milliseconds 10s Digit (Lower Nibble): 0 – 9. x0 – x9 xxxx0000 –xxxx1001 11/(12) 0 –...
  • Page 86 Order Category Byte Value Description Num. (Decimal, hexadecimal, & binary) 16/(17) 0 – 9 Milliseconds 1s Digit (Upper nibble): 0 – 9. 0x – 9x 0000xxxx – 1001xxxx 0 – 9 Milliseconds 0.1s Digit (Lower Nibble): 0 – x0 – x9 xxxx0000 –xxxx1001 Free Run 17/(18)
  • Page 87: Table G-5. "Get Controller Type And Config." Command Return Codes And Data

    Table G-5. "Get Controller Type and Config." command return codes and data Configuration Total Description num. Category Num. Possible values bytes Bytes ASCII Meaning string Command echo 253 decimal; FD ý back hexadecimal. * Lambda SC, with Controller Type firmware version V and firmware vV.SS and subversion SS...
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  • Page 89: Index

    INDEX adapters input commands specifications ............7 serial interface ........... 44 basic operation ............12 line power (mains) ..........12 initialization ............12 mains..............12 cleaning ..............57 fuses ............... 3, 70 commands power cord ............70 filter ..............28 voltage ..............
  • Page 90 Opening and closing times ......17 Repetition rates and duty cycle ....18 Step motor based shutter advantages .... 15 warranty ..............67 weight ..............69 use with other Sutter Instrument Co. products ................7 NOTES LAMBDA SC OPERATION MANUAL – REV. 1.14C (20190606)

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