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Lambda SR474 Operation Manual

Four channel shutter driver
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Operation Manual
Four Channel Shutter Driver
Stanford Research Systems
Distribution in the UK & Ireland
Lambda Photometrics Limited
Lambda House Batford Mill
Harpenden Herts AL5 5BZ
United Kingdom
E:
info@lambdaphoto.co.uk
W: www.lambdaphoto.co.uk
T:
+44 (0)1582 764334
F:
+44 (0)1582 712084
SR474
Revision 1.0 • February 9, 2009

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Summary of Contents for Lambda SR474

  • Page 1 Distribution in the UK & Ireland Lambda Photometrics Limited Operation Manual Lambda House Batford Mill Harpenden Herts AL5 5BZ United Kingdom info@lambdaphoto.co.uk W: www.lambdaphoto.co.uk +44 (0)1582 764334 +44 (0)1582 712084 Four Channel Shutter Driver SR474 Stanford Research Systems Revision 1.0 • February 9, 2009...
  • Page 2 Copyright c Stanford Research Systems, Inc., 2009. All rights reserved. Stanford Research Systems, Inc. 1290–D Reamwood Avenue Sunnyvale, CA 94089 USA Phone: (408) 744-9040 • Fax: (408) 744-9049 www.thinkSRS.com • e-mail: info@thinkSRS.com Printed in U.S.A. Document number 9-01635-903 SR474 Four Channel Shutter Driver...

  • Page 3: Table Of Contents

    Front-Panel Operation ....1 – 2 The SR474 Rear Panel ....1 – 7 2 Remote Operation 2 –...
  • Page 4 Contents SR474 Four Channel Shutter Driver...

  • Page 5: General Information

    General Information The SR474 Four Channel Shutter Driver is a flexible instrument ca- pable of driving and providing I/O interfaces for up to four external SR470 Series Laser Shutter heads. The shutter heads can be controlled through rear-panel TTL level inputs that accept external timing signals.

  • Page 6: Safety And Preparation For Use

    Earth through the power-line-outlet ground. Line Fuse There are two line fuses internal to the SR474 that may not be serviced by the user. If no front panel LEDs are lit when line power is applied and the power switch is in the “on”...

  • Page 7: Environment

    Visible and invisible beams of light have the potential to cause serious bodily injury including blindness or death and to cause sig- nificant damage to property. While the SR474 is designed for use with laser systems, it is fully the users responsibility to ensure...

  • Page 8: Symbols

    Symbols you may Find on SRS Products Symbol Description Alternating current Caution - risk of electric shock Frame or chassis terminal Caution - refer to accompanying documents Earth (ground) terminal Battery Fuse On (supply) Off (supply) SR474 Four Channel Shutter Driver...

  • Page 9: Notation

    • Literal text other than command names is set as OFF. Remote command examples will all be set in monospaced font. In these examples, data sent by the host computer to the SR474 are set as straight teletype font, while responses received by the host computer from the SR474 are set as slanted teletype font.

  • Page 10: Specifications

    Front panel LEDs can be disabled by holding the front-panel Local button for 2 s. Remote Operation Shutter polarity and some communications parameters are controlled by rear-panel DIP switches. All other instrument functions are controllable over GPIB, RS-232, and Ethernet interfaces. SR474 Four Channel Shutter Driver...
  • Page 11 ◦ Operating Temperature C to 40 C, non-condensing Power 90 VAC to 260 VAC, 47 Hz to 63 Hz 85 W max Physical Weight 7 lbs 8.25 W × 4 H × 11 D Dimensions SR474 Four Channel Shutter Driver...
  • Page 12 General Information SR474 Four Channel Shutter Driver...
  • Page 13 1.2.4 Restoring factory default configuration ..1 – 7 The SR474 Rear Panel ....1 – 7 1.3.1 Power entry ....1 – 8 1.3.2...

  • Page 14: Getting Started

    1.1.1 Overview The basic function of the SR474 Four Channel Shutter Driver is to provide power, manual control, and I/O interfaces to between one and four SR470 Series Laser Shutters. The shutters connect to outputs...
  • Page 15 If a given channel is initially in the OFF state, then pressing Enable will cause the SR474 to attempt to enable the shutter head connected to that channel. If the head powers on successfully, the channel will display its state with either the OPEN or CLOSED indicator.
  • Page 16 +12 VDC line that provides power to the motor (coil) in an attached shutter head. When a channel of the SR474 is in the OFF state, a shutter head con- nected to that channel is said to be in Standby mode. In this mode,...

  • Page 17: Global Controls

    The rear-panel Alarm output (§1.3.6) is asserted (pulled low) when- ever at least one of the four shutter channel FAULT indicators is lit. In the event that an alarm is asserted, the SR474 will continuously emit a loud siren-like noise to attract attention if the Audible mode is selected.

  • Page 18: Remote Lockout And Front-Panel Operation

    The expected configuration of the SR474 is also saved, such that if a shutter head is accidentally discon- nected during a power outage, a fault will be declared in that channel when power is restored, and cannot be cleared by merely cycling the power.

  • Page 19: The Sr474 Rear Panel

    1 – 7 1.2.4 Restoring factory default configuration The SR474 can be reset to its factory-default settings by power cycling the unit with the Reset key depressed. This is equivalent to sending the *RST command over one of the remote interfaces. It performs the following actions: 1.

  • Page 20: Power Entry

    Always use an outlet which has a properly connected protective ground. 1.3.2 Chassis ground This binding post is connected to the SR474 chassis and to earth ground. 1.3.3 TTL Inputs The primary control inputs for the SR474 Four Channel Shutter Driver are the four rear-panel BNC inputs corresponding to the four shutter channels.

  • Page 21: Aux I/O Port

    1.3 The SR474 Rear Panel 1 – 9 Figure 1.3: Shutter connector pinout, as seen looking into one of the connectors on the rear panel. Connector Pin Description +12 V to shutter head (Coil power supply) Ground TX (Serial to shutter head) RX (Serial from shutter head) +4.5 V to shutter head (Logic power supply)

  • Page 22: Alarm Output

    The Alarm output port is always active. The polarity of the signal is such that the SR474 will no longer hold the Alarm signal at +5 VDC in the event that it loses line power. 1.3.7 Shutter polarity switches The polarity of each shutter channel is either normally open or nor- mally closed as determined by the configuration of the rear-panel...
  • Page 23 1 – 11 address 5. As a special case, address 31 (all five bus address switches down) is reserved as a setting to disable the SR474 GPIB interface. Any changes made will not take effect until the instrument is power cycled.

  • Page 24: Shutter Grounding Considerations

    SR474. The procedure for removing shield-ground connection for a channel inside the SR474 is as follows. First, turn off and unplug the unit. Wait one minute after removing power to reduce the risk due to residual voltages inside the instrument.
  • Page 25 Table 1.3: Grounding jumper locations Figure 1.5: Shutter cable ground selection header. Part (a) shows the cable shield grounded at the SR474 with the jumper over the two pins marked “GROUND” and part (b) shows the cable ground floating, where the jumper sits over the two pins marked “FLOAT.”...
  • Page 26 1 – 14 Getting Started SR474 Four Channel Shutter Driver...
  • Page 27 2 Remote Operation This chapter describes operating the SR474 over the serial interface. In This Chapter Index of Common Commands ... . . 2 – 2 Alphabetic List of Commands ... . . 2 – 4 Introduction .

  • Page 28: Remote Operation

    MODE(?) c{,i} 2 – 15 Shutter Mode MODL? c 2 – 15 Shutter Model MUTE(?) {i} 2 – 15 Mute Alarm POLR? c 2 – 15 Shutter Polarity RATE? c 2 – 16 Maximum Rate SR474 Four Channel Shutter Driver...
  • Page 29 LCAL 2 – 20 Go to Local LOCK? 2 – 20 Request Lock UNLK? 2 – 20 Release Lock REMT 2 – 20 Go to Remote XTRM i{,j}{,k } 2 – 21 Set Interface Terminator SR474 Four Channel Shutter Driver...

  • Page 30: Alphabetic List Of Commands

    FSET i 2 – 15 Force Global Set/Reset of All Shutters GSET i 2 – 15 Global Set/Reset of All Shutters IFCF(?) i{,j} 2 – 19 Interface Configuration IFRS i 2 – 20 Interface Reset SR474 Four Channel Shutter Driver...
  • Page 31 2 – 16 Shutter Status Byte STAT(?) [c{,}]{i} 2 – 17 Open/Closed State TEMP? c 2 – 17 Shutter Temperature UNLK? 2 – 20 Release Lock XTRM i{,j}{,k } 2 – 21 Set Interface Terminator SR474 Four Channel Shutter Driver...

  • Page 32: Introduction

    2 – 6 Remote Operation 2.3 Introduction The SR474 may be remotely programmed via the GPIB interface, the RS-232 serial interface, or the LAN ethernet interface using a simple command language documented in this chapter. Any host computer interfaced to the SR474 can easily control and monitor the operation of the SR474.
  • Page 33 In these examples, all data sent by the host computer to the SR474 are set as straight teletype font, while responses received the host computer from the SR474 are set as slanted teletype font. The usage examples vary with respect to set/query, optional parame- ters.

  • Page 34: Command List

    QYE query error DDE device dependent error EXE execution error CME command error Reserved PON power-on *ESR? CR Example: The returned value of 176 (= 2 ) indicates that PON, CME, and EXE are set. SR474 Four Channel Shutter Driver...
  • Page 35 Power-on Status Clear Set (query) the Power-on Status Clear flag {to i}. The Power-on Status Clear flag is stored in nonvolatile memory in the SR474, and thus, maintains its value through power-cycle events. If the value of the flag is 0, then the Service Request Enable and Standard Event Status Enable Registers (*SRE, *ESE) are stored in non-volatile memory, and retain their values through power-cycle events.
  • Page 36 Service Request Enable Set (query) the Service Request Enable register {to i}. Bits set in this register cause the SR474 to generate a service request when the corresponding bit is set in the STB register. SR474 Four Channel Shutter Driver...
  • Page 37 *WAI Wait for Command Execution The instrument will not process further commands until all prior commands including this one have completed. *WAI CR Example: Wait for all prior commands to execute before continuing. SR474 Four Channel Shutter Driver...

  • Page 38: Status Reporting Commands

    ) gives bits (b,a)= (1, 0) for channel 2 and (b,a)= (0, 1) for channel 1. These results indicate that the shutter head on channel 2 reports a fault condition and that there is no shutter head connected to channel 1. SR474 Four Channel Shutter Driver...

  • Page 39: Instrument Control Commands

    As a special case, a value of c equal to 0 refers to all channels. Sync output with c equal to 0 is asserted according to the logical OR of the assertion state of channels 1-4. AUXC 1,0 CR Example: SR474 Four Channel Shutter Driver...
  • Page 40 The fault is cleared when the shutter is turned off. Changing the state of a shutter from disabled to enabled takes 500 ms to complete. See §1.2.1.2 for more about shutter head operation and standby modes. SR474 Four Channel Shutter Driver...
  • Page 41 12 and 13 of the shutter status byte (see SSTB). Since the mode setting is stored in the volatile memory of the shutter head, not in the SR474 , the mode setting is lost whenever the SR474 or the individual shutter head is reset or re-enabled.
  • Page 42 SRCE 3,1 CR Example: Place shutter 3 under TTL control. SSTB? c Shutter Status Byte Query the shutter status byte for shutter c. This command sends ‘Z’ to the shutter and returns the response. SR474 Four Channel Shutter Driver...

  • Page 43: Interface Configuration Commands

    2.6.4 Interface Configuration Commands COMP i Compatibility Mode Enter the SR474’s compatibility mode. If the parameter i is set to 1, the instrument enters compatibility mode. In compatibility mode the single ASCII bytes ‘@’ through ‘I’ control the open and close states of all shutters. The ASCII byte ‘Z’ is used to return the instrument to normal mode.
  • Page 44 Control bytes in compatibility mode are acted upon immediately. (Command terminators such as CR are ignored.) Compatibility mode, as set by COMP 1, will be cancelled by power cycling the SR474. If compatibility mode is desired at turn-on, it can be enabled with the IFCF command. EMAC? Ethernet MAC Address Query the SR474’s ethernet MAC address.
  • Page 45 IFCF 7,0 CR Example: Disable Telnet Access IFCF 9,192.168.10.5 CR Example: Set IP address to 192.168.10.5 IFCF 10,255.255.255.0 CR Example: Set network mask to 255.255.255.0 IFCF?4 CR Example: 192.168.10.1 The returned value indicates the active default gateway. SR474 Four Channel Shutter Driver...
  • Page 46 LOCK? Request Lock Request the instrument lock. The SR474 returns 1 if the lock is granted and 0 otherwise. When the lock is granted, no other instrument interface may alter instrument settings until the lock is released via the UNLK command or the power is cycled.
  • Page 47 XTRM with parameters that consist of the decimal equivalent of the ASCII characters desired, separated by commas. XTRM 65,66,13 Example: Set the interface terminator to ‘AB CR ’ SR474 Four Channel Shutter Driver...

  • Page 48: Error Codes

    2 – 22 Remote Operation 2.7 Error Codes The SR474 contains an error buffer that stores up to 20 error codes associated with errors encountered during power-on self tests, com- mand parsing, or command execution. The ERR LED will be high- lighted when a remote command fails for any reason.

  • Page 49: Query Errors

    No Listener This is a communications error that occurs if the SR474 is addressed to talk on the GPIB bus, but there are no listeners. The SR474 discards any pending output. 2.7.3 Device Dependent Errors...
  • Page 50 Integer Overflow A parsed integer was too large to store correctly. Invalid Hexadecimal The parser expected hexadecimal characters but was unable to parse them. Syntax Error The parser detected a syntax error in the com- mand. SR474 Four Channel Shutter Driver...

  • Page 51: Communication Errors

    The error buffer is full. Subsequent errors have been dropped. Distribution in the UK & Ireland Lambda Photometrics Limited Lambda House Batford Mill Harpenden Herts AL5 5BZ United Kingdom Characterisation, info@lambdaphoto.co.uk Measurement & W: www.lambdaphoto.co.uk +44 (0)1582 764334 Analysis +44 (0)1582 712084 SR474 Four Channel Shutter Driver...

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