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Lakeshore 647 User Manual

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USER'S MANUAL
Model 647
Magnet Power Supply
Lake Shore Cryotronics, Inc. • 575 McCorkle Blvd. • Westerville, OH 43082-8888
PH: 614-891-2243 • FAX: 614-891-1392
Internet Addresses: sales@lakeshore.com, service@lakeshore.com
Methods and apparatus disclosed and described herein have been developed solely on company funds of Lake Shore Cryotronics, Inc. No government or other contractual support or
relationship whatsoever has existed which in any way affects or mitigates proprietary rights of Lake Shore Cryotronics, Inc. in these developments. Methods and apparatus disclosed
herein may be subject to U.S. Patents existing or applied for. Lake Shore Cryotronics, Inc. reserves the right to add, improve, modify, or withdraw functions, design modifications, or
products at any time without notice. Lake Shore shall not be liable for errors contained herein or for incidental or consequential damages in connection with furnishing, performance, or
use of this material.
Rev. 1.0
19 January 1998

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  • Page 1 Lake Shore Cryotronics, Inc. • 575 McCorkle Blvd. • Westerville, OH 43082-8888 PH: 614-891-2243 • FAX: 614-891-1392 Internet Addresses: sales@lakeshore.com, service@lakeshore.com Methods and apparatus disclosed and described herein have been developed solely on company funds of Lake Shore Cryotronics, Inc. No government or other contractual support or relationship whatsoever has existed which in any way affects or mitigates proprietary rights of Lake Shore Cryotronics, Inc.
  • Page 2 Lake Shore Model 647 Magnet Power Supply User’s Manual MAGNET POWER SUPPLY CONFIGURATION Sales Order Number: _______________________________ MPS Model Number:_____________________________ Shipping Date: ____________________________________ MPS Serial Number: _____________________________ Power Settings: ___________________________________________________________________________________ Below is a checklist of major options installed in your Model 622/633 Magnet Power Supply. Read the manual before 6224 IEEE-488/Serial Interface attempting to operate the equipment.

  • Page 3: Table Of Contents

    Lake Shore Model 647 Magnet Power Supply User’s Manual TABLE OF CONTENTS Chapter/Paragraph Title Page List of Illustrations..........................List of Tables ........................... Foreword ............................Purpose and Scope ........................Hardware Covered........................How To Use This Manual......................Warnings, Cautions, and Notes ....................

  • Page 4: Chapter/Paragraph Title Page

    Lake Shore Model 647 Magnet Power Supply User’s Manual Chapter/Paragraph Title Page OPERATION........................... General ........................... The MPS Front Panel ..................... Power UP........................General Display Description ................... Numeric Entry ......................... Function Menu 1 ......................3.5.1 Setup Screen ........................3.5.2 Output Only Screen ......................
  • Page 5 Lake Shore Model 647 Magnet Power Supply User’s Manual Chapter/Paragraph Title Page OPTIONS AND ACCESSORIES ....................General..........................Model 6224 IEEE-488/Serial Interface................Model 6476 Gaussmeter Input Card................6.2.1 Hall Sensor Mounting Considerations ................6.2.2 Connections ........................6.2.3 Installation ........................6.2.4 Operation.........................
  • Page 6 Lake Shore Model 647 Magnet Power Supply User’s Manual LIST OF ILLUSTRATIONS Figure No. Title Page 1-1 Four-Quadrant Power ........................1-2 Comparison of Old and New MPS Designs..................2-2 RI, FLT, ON, and OVP Connections ....................2-3 Analog Monitoring, Programming, & Remote Sense Connections..........

  • Page 7: Foreword

    FOREWORD PURPOSE AND SCOPE This manual contains user instructions for the Model 647 Superconducting Magnet Power Supply. Lake Shore Cryotronics, Inc. designed, manufactures, and assembles the MPS in the United States of America. We welcome your comments concerning this manual. Although every effort has been made to keep it free of errors, some may occur.

  • Page 8: Electrostatic Discharge

    Lake Shore Model 647 Magnet Power Supply User’s Manual ELECTROSTATIC DISCHARGE Electrostatic Discharge (ESD) may damage electronic parts, assemblies, and equipment. ESD is a transfer of electrostatic charge between bodies at different electrostatic potentials caused by direct contact or induced by an electrostatic field.

  • Page 9: Magnet Quenches

    Lake Shore Model 647 Magnet Power Supply User’s Manual MAGNET QUENCHES For protection during a magnet quench, fit the dewar with pressure relief valves of sufficient size and pressure rating to allow the helium gas to escape and to prevent excessive pressure in the dewar. Operating a magnet in a dewar without proper pressure relief is dangerous and possibly life-threatening.

  • Page 10: Safety Summary

    Lake Shore Model 647 Magnet Power Supply User’s Manual SAFETY SUMMARY Observe the following general safety precautions during all phases of operation, service, and repair of this instrument. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design, manufacture, and intended use of the instrument.

  • Page 11: Introduction

    Lake Shore Model 647 Magnet Power Supply User’s Manual CHAPTER 1 INTRODUCTION GENERAL This chapter covers Features (Paragraph 1.1), Specifications (Paragraph 1.2), and Operating Characteristics (Paragraph 1.3). 647 MAGNET POWER SUPPLY FEATURES • True, Four-Quadrant Bidirectional Power Flow Operate current or voltage as a source or a sink in either positive or negative polarities. Sink power returns to the AC line instead of dissipating through an energy absorber.

  • Page 12: Specifications

    Lake Shore Model 647 Magnet Power Supply User’s Manual SPECIFICATIONS Below are performance specifications for current with a 1 Henry load and voltage with a resistive load. DC Output: True, Four-Quadrant, Bidirectional Power Flow output. Autoranging current and voltage operate as a source or a sink in either polarity in current or voltage mode.
  • Page 13 Lake Shore Model 647 Magnet Power Supply User’s Manual Agency Approvals: The Model 647 complies with the following requirements: UL 1244 - Electrical and Electronic Measuring and Testing Equipment VDE 0411 - Electronic Measuring Instruments and Automatic Controls FCC 15J - Level A RFI Suppression VDE 0871 - Level A RFI Suppression Operating Ambient Temperature: 15 to 35 °C (59 to 95 °F)

  • Page 14: Operating Characteristics

    Lake Shore Model 647 Magnet Power Supply User’s Manual OPERATING CHARACTERISTICS Many Model 647 MPS operating characteristics ideally suit it for charge and discharge cycling of superconducting magnet loads. These characteristics significantly differentiate the Model 647 from conventional MPS's. Consider them when choosing the best MPS for a particular application.

  • Page 15: Low Noise, High Stability Current Regulated Output

    1.3.3 Highly Efficient, Air Cooled, Compact Unit Model 647 MPS: Quiet switched-mode design. The output uses a proprietary pulse width modulated technique that incorporates power hybrid circuitry. Extremely low conduction loss components minimize internal power dissipation. The MPS is not a direct off-line switching supply. The output is fully floating and isolated from ground.
  • Page 16 Lake Shore Model 647 Magnet Power Supply User’s Manual This Page Intentionally Left Blank Introduction...

  • Page 17: Initial Setup And Connections

    Lake Shore Model 647 Magnet Power Supply User’s Manual CHAPTER 2 INITIAL SETUP AND CONNECTIONS INSPECTING AND UNPACKING The MPS ships in a special cardboard box with integrated forklift skid openings. Do not stack anything on top of the MPS box. Upon receipt, set the box on a level surface with the pallet side down. Inspect the shipping container for external damage.

  • Page 18: Connecting The Mps To Power

    Lake Shore Model 647 Magnet Power Supply User’s Manual CONNECTING THE MPS TO POWER Read and thoroughly understand sections 2.4.1 through 2.4.3 and the safety recommendations in the Forward before connecting the MPS to power. Failure to do so may expose operating personnel to lethal voltages or damage the magnet and/or MPS.

  • Page 19: Power Up

    Lake Shore Model 647 Magnet Power Supply User’s Manual Use this procedure to connect input power to the MPS: 1. Loosen the two connector cover screws and open the cover. 2. Slip the strain relief over the power cable with the flanged end at the end to be terminated.

  • Page 20: Shielding, Grounding, And Noise

    Lake Shore Model 647 Magnet Power Supply User’s Manual 2.5.2 Shielding, Grounding, and Noise For noise reduction, tightly twist and shield the leads from the MPS to the magnet. Connect the shield to the MPS chassis as shown in figure 2-4.

  • Page 21: Mps Analog Current And Voltage Monitoring Connections

    Lake Shore Model 647 Magnet Power Supply User’s Manual 2.5.6 MPS Analog Current And Voltage Monitoring Connections The MPS provides amplified and buffered current and voltage monitor output signals at the terminal block on the back panel. Connect these signals to external meters to indicate output current and voltage. Obtain the Current Monitor signal through connections to terminals 9 (Im) and 11 (m) with positive output currents producing a positive monitor voltage of 10 mV/A from Im to m.

  • Page 22: Remote Sense Connections

    Lake Shore Model 647 Magnet Power Supply User’s Manual 2.5.8 Remote Sense Connections The factory configures the MPS to sense, but not control remote voltage. Call Lake Shore to reconfigure the MPS to control voltage at the load. When using remote sense, the MPS measures voltage at the magnet instead of at the MPS output terminals allowing a more accurate reading of magnet voltage by eliminating voltage drops in the leads connecting the MPS to the magnet.
  • Page 23 Lake Shore Model 647 Magnet Power Supply User’s Manual Use the procedure below and see Figure 2-5 to connect multiple MPS units in auto-parallel configuration: 1. Turn off all units and completely disconnect power at the source before changing MPS configuration.

  • Page 24: Typical Multiple Mps Connections For Two Mps Units

    Lake Shore Model 647 Magnet Power Supply User’s Manual 8. Verify all connections as summarized in Table 2-5. MPS 1 MPS 2 9. To add a third MPS or a fourth MPS in parallel, make the RI/FLT, Control Bus Control Bus...

  • Page 25: Post-Installation Instructions

    Lake Shore Model 647 Magnet Power Supply User’s Manual POST-INSTALLATION INSTRUCTIONS The MPS is electrically and mechanically inspected and operationally tested prior to shipment. It should be damage-free and in perfect working order upon receipt. To confirm this, visually inspect the instrument for damage and test it electrically to detect any concealed damage upon receipt.
  • Page 26 Lake Shore Model 647 Magnet Power Supply User’s Manual This Page Intentionally Left Blank 2-10 Setup & Connections...

  • Page 27: Operation

    Lake Shore Model 647 Magnet Power Supply User’s Manual CHAPTER 3 OPERATION GENERAL This chapter covers seven areas: MPS Front Panel (Paragraph 3.1), Power Up (Paragraph 3.2), Setting Current on an MPS with Manual PSH Control (Paragraph 3.3), Setting Current with Automatic PSH Control (Paragraph 3.4), Instrument Setup Screens (Paragraph 3.5), Function Menus (Paragraph 3.6), and an...

  • Page 28: General Display Description

    Lake Shore Model 647 Magnet Power Supply User’s Manual GENERAL DISPLAY DESCRIPTION In general, screen displays are split into two sections. The left section is the Entry Window where users enter new parameters. The right section is the Menu Window where Menus display when Output values do not. The arrow (¤) symbol is the line indicator.

  • Page 29: Output Only Screen

    V M A X S E T :+ 3 2 .0 0 V EXIT MENU Returns to the display screen the Function Menu 2 was entered from. LHe LEVEL Liquid Helium Level is not used with the Model 647 and shows <NP>. FIELD Enters the Field screen. See Paragraph 6.2. SWITCH HTR Persistent Switch Heater is not used with the Model 647 and shows <NP>.

  • Page 30: Current Zero Screen

    Lake Shore Model 647 Magnet Power Supply User’s Manual FUNCTION MENU 3 SCREEN Press Function Menu to display Function Menu 1. 3/ 3 S E T T IN G S : EX IT M E NU Press Next Menu twice to display Function Menu 3.

  • Page 31: Remote Operation

    REMOTE OPERATION 4.0. GENERAL Either of two computer interfaces available for the Model 647 permit remote MPS operation: the IEEE-488 Interface (Paragraph 4.1) and the Serial Interface (Paragraph 4.2). Use only one of the interfaces at a time. The two interfaces share a common set of commands described in Paragraph 4.3. For further information on RS-485 Mainframe Control Bus Operation, see Appendix C.

  • Page 32: Ieee-488 Command Structure

    Lake Shore Model 647 Magnet Power Supply User’s Manual 4.1.2 IEEE-488 Command Structure The Model 647 supports several command types. There are three groups of commands: 1. Bus Control – see Paragraph 4.1.2.1. a. Universal (1) Uniline (2) Multiline b. Addressed Bus Control 2.
  • Page 33 Lake Shore Model 647 Magnet Power Supply User’s Manual The Status Byte Register consists of a single data byte containing seven bits of MPS status information. STATUS BYTE REGISTER FORMAT Weighting Bit Name If the Service Request is enabled, any bits that are set cause the MPS to pull the SRQ management low to signal the BUS CONTROLLER.

  • Page 34: Example Ieee Setup And Program

    Lake Shore Model 647 Magnet Power Supply User’s Manual 4.1.3.2 Standard Event Status and Standard Event Status Enable Registers The Standard Event Status Register supplies various conditions of the instrument. STANDARD EVENT STATUS REGISTER FORMAT Weighting not used not used Bit Name Bits 2 and 6 are not used.

  • Page 35: 4.1.4.2 Run The Example Quickbasic Program

    Lake Shore Model 647 Magnet Power Supply User’s Manual 4.1.4.2 Run The Example QuickBasic Program Use the following procedure to run the QuickBasic Program. 1. Copy c:\gpib-pc\Qbasic\qbib.obj to the QuickBasic directory (QB4). 2. Change to the QuickBasic directory and type: link /q qbib.obj,,,bqlb4x.lib where x = 0 for QB4.0 and 5 for QB4.5 This one-time only command produces the library file qbib.qlb.

  • Page 36: Sample Basic Ieee-488 Interface Program

    Lake Shore Model 647 Magnet Power Supply User’s Manual Table 4-1 Sample BASIC IEEE-488 Interface Program IEEEEXAM.BAS EXAMPLE PROGRAM FOR IEEE-488 INTERFACE This program works with QuickBasic 4.0/4.5 on an IBM PC or compatible. The example requires a properly configured National Instruments GPIB-PC2 card. The REM $INCLUDE statement is necessary along with a correct path to the file QBDECL.BAS.

  • Page 37: Typical National Instruments Gpib Configuration From Ibconf.exe

    Lake Shore Model 647 Magnet Power Supply User’s Manual National Instruments GPIB0 configuration GPIB-PC2/2A Ver 2.1 Primary GPIB Address.... Select the primary GPIB address by Secondary GPIB Address..NONE using the left and right arrow keys. Timeout setting ....... 10sec This address is used to compute the Terminate Read on EOS ..

  • Page 38: Serial I/O Interface

    Lake Shore Model 647 Magnet Power Supply User’s Manual 4.2. SERIAL I/O INTERFACE RS-232C is a standard of the Electronics Industries Association (EIA) and one of the most common interfaces between a computer and electronic equipment. The Customer supplied computer must have a Serial Interface port.

  • Page 39: Serial Interface Hardware Configuration

    Lake Shore Model 647 Magnet Power Supply User’s Manual 4.2.1 Serial Interface Hardware Configuration Below is a technical description of the 6224 option card for the Serial Interface configuration. (Note: See Appendix C for Serial Interface on CMP.) Table 4.2 defines communication parameters. Terminators are fixed to Carriage Return (CR) and Line Feed (LF).

  • Page 40: Sample Basic Serial Interface Program

    Lake Shore Model 647 Magnet Power Supply User’s Manual Table 4-3 Sample BASIC Serial Interface Program SEREXAM.BAS EXAMPLE PROGRAM FOR SERIAL INTERFACE This program works with QuickBasic 4.0/4.5 or Qbasic on an IBM PC or compatible with a serial interface. It uses the COM1 communication port at 9600 BAUD. Enter an instrument command or query at the prompt.

  • Page 41: Summary Of Ieee-488/Serial Interface Commands

    Lake Shore Model 647 Magnet Power Supply User’s Manual SUMMARY OF IEEE-488/SERIAL INTERFACE COMMANDS Below is an alphabetical list of IEEE-488/Serial Interface commands consisting of Operational Commands (Paragraph 4.3.1.1), Interface Commands (Paragraph 4.3.1.2), Ramping Commands (Paragraph 4.3.1.3),. Current Zero Commands (Paragraph 4.3.1.4), Current Step Limit Commands (Paragraph 4.3.1.5), and Common Commands (Paragraph 4.3.1.6).

  • Page 42: Operational Commands Description

    Lake Shore Model 647 Magnet Power Supply User’s Manual 4.3.1.1 Operational Commands Description Below is a list of MPS Operational Commands which configure the various functions. ERR?: Error Status Query Input: ERR? Returned: [OVP] [RI] [STEP] Remarks: Returns 0 if the error is inactive or 1 if it is active. Returns three characters plus up to two terminators.
  • Page 43 Lake Shore Model 647 Magnet Power Supply User’s Manual RI?: Remote Inhibit Status Query Input: Returned: 0 if the remote inhibit is inactive, or 1 if it is active. Remarks: One character plus up to two terminators are returned. VOUT? (V?):...

  • Page 44: Interface Commands Description

    Lake Shore Model 647 Magnet Power Supply User’s Manual 4.3.1.2 Interface Commands Description The MPS Interface Commands below help configure IEEE-488 interface compatibility for a variety of computer equipment. END: Programs MPS Interface EOI (End Or Identify) Status Input: END [status] where [status] = 0 to enable the EOI, or 1 to disable it.

  • Page 45: Ramping Commands Description

    Lake Shore Model 647 Magnet Power Supply User’s Manual 4.3.1.3 Ramping Commands Description The following MPS Ramping Commands configure the various functions of the ramping features. RAMP: Programs Ramp Segment Parameters Input: RAMP[segment],[initial ramp current],[final ramp current],[ramp rate],[00],[--:--:--:--] where: [segment] = 1. (Future updates will allow up to nine segments.) [initial ramp current] = 0 to ±72 A.

  • Page 46: Current Zero Commands Description

    Lake Shore Model 647 Magnet Power Supply User’s Manual 4.3.1.4 Current Zero Commands Description The following MPS commands configure the various functions of the current zero features. IMODE?: Current Programming Mode Query Input: IMODE? Returned: 0 if I MODE switch is set to EXT, or 1 if set to INT.

  • Page 47: Current Step Limit Commands Description

    Lake Shore Model 647 Magnet Power Supply User’s Manual 4.3.1.5 Current Step Limit Commands Description The following MPS commands configure the various functions of the current step limit features. ISTP: Programs Output Current Step Limit Input: ISTP [step limit] where [step limit] = a value between 0 and +999.9900.

  • Page 48: Common Commands Description

    Lake Shore Model 647 Magnet Power Supply User’s Manual 4.3.1.6 Common Commands Description The MPS Common Commands below are input/output commands defined by the IEEE-488 standard and shared with other instruments complying with the standard. Common commands begin with “*”.
  • Page 49 Lake Shore Model 647 Magnet Power Supply User’s Manual *IDN?: Identification Query Input: *IDN? Returned: Manufacturer, Model Number, Model Serial Number, Firmware Date. Remarks: Returns seventeen characters plus up to two terminators. Example: LSCI,622,0,120193[term] *OPC: Operation Complete Status Input: *OPC Returned: Nothing.
  • Page 50 Lake Shore Model 647 Magnet Power Supply User’s Manual SRE: Enables Status Reports In The Service Request Enable Register Input: *SRE [bit weighting] where [bit weighting] = the sum (000 to 255) of bit weighting of each bit to be set. See the discussion on registers and below.

  • Page 51: Error Messages And Troubleshooting

    Lake Shore Model 647 Magnet Power Supply User’s Manual CHAPTER 5 ERROR MESSAGES AND TROUBLESHOOTING The MPS sounds the alarm and halts operation until the user presses a Data Entry up (s) or down (t) key GENERAL to clear the fault. When the fault clears, the MPS...
  • Page 52 Lake Shore Model 647 Magnet Power Supply User’s Manual No delay is allowed (CAL AND ID switch 7 OFF, a fault and sounds the alarm about once per second. down) and multiple MPS operation (CAL AND ID The MPS sets output voltage compliance to the level switch 4 ON, up) must be selected.

  • Page 53: Factory Default Settings

    Lake Shore Model 647 Magnet Power Supply User’s Manual Rail Fault Detected Excessive DC rail voltage (unable to return power to the O U T P U T : IN T E R N A L utility or some other internal fault), causes the MPS to 0 .0 0 A...

  • Page 54: Calibration

    Lake Shore Model 647 Magnet Power Supply User’s Manual 8. Connect the DVM reading voltage across the CALIBRATION +OUT and –OUT terminals. NOTE: Calibration is only as accurate as the current monitor shunt. The factory uses a current monitor 9. Send the command ‘VZER’ to inform the MPS of shunt rated at 0.02% accuracy.

  • Page 55: Performance Test

    Lake Shore Model 647 Magnet Power Supply User’s Manual 20. Convert DVM voltage reading to current. A ‘CALMN-48.7655’. The MPS determines the reading of +0.512345V equals +51.2345A. Send negative current calibration constant. actual current with ‘CALPL+xxx.xxxx’. If actual 23. The MPS stores the zero, positive, and negative current is +51.2345A, send ‘CALPL+51.2345’.

  • Page 56: Rear Panel Connector Details

    Lake Shore Model 647 Magnet Power Supply User’s Manual 17. Set output current to 0 A. 14. Set output current to +100 Amps. The DVM should read about +66 mV. After about 1 Fault/RI Operation Verification minute, the DVM should read +66.666 mV 18.

  • Page 57: Serial Interface Cable And Adapters

    Lake Shore Model 647 Magnet Power Supply User’s Manual IEEE-488 INTERFACE CONNECTOR SYMBOL DESCRIPTION (When Model 6224 Option Is Present) DIO1 Data Input/Output Line 1 Connect to the rear MPS IEEE-488 Interface DIO2 Data Input/Output Line 2 connector with cables specified in the IEEE-488-...
  • Page 58 Lake Shore Model 647 Magnet Power Supply User’s Manual This Page Intentionally Left Blank Options & Accessories...

  • Page 59: Options And Accessories

    OPTIONS AND ACCESSORIES GENERAL This chapter covers Model 647 MPS options and accessories: Model 6224 IEEE-488/Serial Interface (Paragraph 6.1), Model 6476 Gaussmeter Input Card (Paragraph 6.2), Model 6477 High Resolution Display and Programming Option (Paragraph 6.3), and Accessories (Paragraph 6.4).

  • Page 60: Connections

    Lake Shore Model 647 Magnet Power Supply User’s Manual in the mechanical orientation or in the direction of either the magnetic field or the control current will result in a polarity change of the output voltage. The active area of the Model HGCA-3020 Axial Hall Sensor is approximately 0.03 inch in diameter in the center of the face opposite the leads.

  • Page 61: Remote Operation Commands

    Lake Shore Model 647 Magnet Power Supply User’s Manual 6.2.4 Operation To access field monitoring, press Function Menu, F IE L D M E A S U R E M E N T : O U T P U T : then Next Menu.

  • Page 62: Model 6477 High Resolution Display And Programming Option

    Lake Shore Model 647 Magnet Power Supply User’s Manual BUNI? Magnetic Field Units Query Input: BUNI? Returned: Either kG for kilogauss or T for tesla (10 kilogauss). Remarks: Returns two characters plus up to two terminators. IBS? Magnetic Field Summary Query...

  • Page 63: Accessories

    RJ-11 to DB-25 Adapter . Adapts RJ-11 receptacle to female DB-25 connector. Used to 2002 connect Model 647 to Serial Port on rear of Customer’s computer. See Figure 7-2. RJ-11 to DE-9 Adapter . Adapts RJ-11 receptacle to female DE-9 connector. Used to 2003 connect Model 647 to Serial Port on rear of Customer’s computer.
  • Page 64 Lake Shore Model 647 Magnet Power Supply User’s Manual This Page Intentionally Left Blank Options & Accessories...
  • Page 65 Lake Shore Model 647 Magnet Power Supply User’s Manual APPENDIX A UNITS FOR MAGNETIC PROPERTIES Conversion from CGS to SI Units Gaussian Conversion SI & Quantity Symbol & CGS emu Factor, C Rationalized mks Magnetic flux density, tesla (T), Wb/m...
  • Page 66 Lake Shore Model 647 Magnet Power Supply User’s Manual This Page Intentionally Left Blank Magnetic Units...

  • Page 67: B1.0 General

    MAINFRAME CONTROL BUS OPERATION B1.0 GENERAL There are seven elements to the Model 647 Mainframe Control Bus operating instructions: Control Bus Serial Interface Specifications (Paragraph B2.0), Control Bus Serial Interface Connector (Paragraph B3.0), Control Bus Serial Interface Configuration (Paragraph B4.0), Selecting the Control Bus Serial Interface Address (Paragraph B5.0), Control Bus Serial Interface Operation (Paragraph B6.0), and a sample control bus serial...

  • Page 68: B4.0 Control Bus Serial Interface Configuration

    Lake Shore Model 647 Magnet Power Supply User’s Manual B4.0 CONTROL BUS SERIAL INTERFACE CONFIGURATION Configure the control bus serial interface for either RS-232C or RS-485 communications with DIP switches on the Communications Processor Board (CMP). The CMP plugs into the Mainframe rear panel. The standard control bus serial interface configuration is RS-485.

  • Page 69: B6.0 Control Bus Serial Interface Operation

    Lake Shore Model 647 Magnet Power Supply User’s Manual B6.0 CONTROL BUS SERIAL INTERFACE OPERATION The host computer initiates the serial interface link and transmits either a command or a query to the Mainframe. The Mainframe stores the characters in a buffer until the carriage return (CR), line feed (LF) terminator sequence.

  • Page 70: B7.0 Control Bus Serial Interface Sample Program

    Lake Shore Model 647 Magnet Power Supply User’s Manual B7.0 CONTROL BUS SERIAL INTERFACE SAMPLE PROGRAM The following PC program is an interactive program that prompts the user for a Mainframe command and displays the Mainframe response. The command must include a query for the Mainframe to respond.

  • Page 71: B-1 Mps Mainframe Control Bus Remote Command Summary

    Lake Shore Model 647 Magnet Power Supply User’s Manual Table B-1 MPS Mainframe Control Bus Remote Command Summary Input Query Function Command *CLS – Clear all pending status. *ESE *ESE? Event status register enable. – *ESR? Event status register contents.

  • Page 72: B-2 Additional Mps Mainframe Control Bus Remote Commands

    Lake Shore Model 647 Magnet Power Supply User’s Manual Table B-2 Additional MPS Mainframe Control Bus Remote Commands Input Query Function Command – Mainframe address. Multidrop address 0-32 available. Commands sent must have the address as the first character. Query response will be “00”...

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