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SRS Labs SIM964 Operation And Service Manual

Analog limiter
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Operation and Service Manual
Analog Limiter
SIM964
Stanford Research Systems
Revision 1.4
August 28, 2006

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  • Page 1 Operation and Service Manual Analog Limiter SIM964 Stanford Research Systems Revision 1.4 August 28, 2006...
  • Page 2 Information in this document is subject to change without notice. Copyright c Stanford Research Systems, Inc., 2006. 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 9-01599-903 SIM964 Analog Limiter...

  • Page 3: Table Of Contents

    Contents General Information Safety and Preparation for Use ....Symbols ......Notation .
  • Page 4 Contents SIM964 Analog Limiter...

  • Page 5: General Information

    Do not install substitute parts or perform any unauthorized modifications to this instrument. The SIM964 is a single-wide module designed to be used inside the SIM900 Mainframe. Do not turn on the power until the module is completely inserted into the mainframe and locked in place.

  • Page 6: Symbols

    General Information 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) SIM964 Analog Limiter...

  • Page 7: 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 SIM964 are set as straight teletype font, while responses received by the host computer from the SIM964 are set as slanted teletype font.

  • Page 8: Specifications

    15 V (50 mA typ., 300 mA max.) General Characteristics Interface Serial (RS-232) through SIM interface Connectors BNC (2 front, 2 rear) DB–15 (male) SIM interface Weight 1.5 lbs Dimensions 1 5 W 3 6 H 7 0 D SIM964 Analog Limiter...

  • Page 9: Getting Started

    1 Getting Started This chapter gives you the necessary information to get started quickly with the SIM964 Analog Limiter. In This Chapter 1.1 Overview ......1 – 2 Front-panel Operation .

  • Page 10: Overview

    If the input signal exceeds one of the limits, the output of the SIM964 will be clamped to that limit for as long as the signal is in excess of the limit. When the input signal returns to the range between the limits, the output immediately recovers and follows the input signal again.

  • Page 11: Front-Panel Operation

    1.2 Front-panel Operation 1 – 3 1.2 Front-panel Operation The front panel of the SIM964 (see Figure 1.1) provides a simple operator interface. Figure 1.1: The SIM964 front and rear panels. 1.2.1 Upper limit The [ ] and [ ] buttons on the left side of the front panel are associated with the upper numeric display to form the Upper Limit block.

  • Page 12: Shortcuts

    1.2.6 Rear panel outputs The two BNC connectors on the rear panel provide TTL monitor signals for the state of the SIM964 Analog Limiter. When the upper or lower limit is exceeded, the corresponding rear panel output is (0 V); otherwise it idles ( 5 V).

  • Page 13: Clock Stopping

    1.3 Clock Stopping 1 – 5 1.3 Clock Stopping The microprocessor clock of the SIM964 stops if the module is idle, “freezing” the digital circuitry. The following actions “wake up” the clock: 1. A power-on. 2. A press of a front-panel button.

  • Page 14: Sim Interface

    SIM900 Mainframe via this connection, either through one of the internal Mainframe slots, or the remote cable interface. It is also possible to operate the SIM964 directly, without using the SIM900 Mainframe. This section provides details on the interface.
  • Page 15 RS-232 serial port of a personal computer. Connect RXD from the SIM964 directly to RD on the PC, TXD directly to TD. In other words, a null-modem style cable is not needed. To interface directly to the DB–9 male (DTE) RS-232 port typically found on contemporary personal computers, a cable must be made with a female DB–15 socket to mate with the SIM964, and a female...
  • Page 16 1.4.2.2 Serial settings The initial serial port settings at power-on are: 9600 Baud, 8–bits, no parity, 1 stop bit, and no flow control. The serial baud rate is fixed, but the parity may be changed with the PARI commands. SIM964 Analog Limiter...

  • Page 17: Remote Operation

    2 Remote Operation This chapter describes operating the SIM964 over the serial interface. In This Chapter 2.1 Index of Common Commands ... . 2 – 2 Alphabetic List of Commands ... . 2 – 4 Introduction .

  • Page 18: Index Of Common Commands

    CONS(?) z 2 – 12 Console Mode LEXE? 2 – 12 Execution Error LCME? 2 – 13 Command Error LBTN? 2 – 13 Button TOKN(?) z 2 – 14 Token Mode TERM(?) z 2 – 14 Response Termination SIM964 Analog Limiter...
  • Page 19 2.1 Index of Common Commands 2 – 3 SIM964 Analog Limiter...

  • Page 20: Alphabetic List Of Commands

    2 – 9 Parity PSTA(?) z 2 – 11 Pulse STATUS Mode TERM(?) z 2 – 14 Response Termination TOKN(?) z 2 – 14 Token Mode ULCR? 2 – 9 Upper Limit Condition ULIM(?) f 2 – 8 Upper Limit SIM964 Analog Limiter...

  • Page 21: Introduction

    2.3 Introduction 2 – 5 2.3 Introduction Remote operation of the SIM964 is through a simple command lan- guage documented in this chapter. Both set and query forms of most commands are supported, allowing the user complete control of the analog limiter from a remote computer, either through the SIM900 Mainframe or directly via RS-232 (see Section 1.4.2.1).

  • Page 22: Command Syntax

    CR LF , the following two commands are equivalent: TERM CRLF —or— TERM 3 For queries that return token values, the return format (keyword or integer) is specified with the TOKN command. SIM964 Analog Limiter...

  • Page 23: Notation

    In these examples, all data sent by the host computer to the SIM964 are set as straight teletype font, while responses received the host computer from the SIM964 are set as slanted teletype font. The usage examples vary with respect to set query, optional param- eters, and token formats.

  • Page 24: Configuration Commands

    Set (query) the SIM964 keep-awake mode to z (OFF 0, ON 1) . Ordinarily, the clock oscillator for the SIM964 microcontroller is held in a stopped state, and only enabled during processing of events (Section 1.3). Setting AWAK ON forces the clock to stay running, and is useful only for diagnostic purposes.

  • Page 25: Monitor Commands

    0 otherwise. Example: OVLD? 2.4.6 Serial Communication Commands PARI(?) z Parity Set (query) parity to z (NONE 0, ODD 1, EVEN 2, MARK 3, SPACE 4) . After power-on, modules default to PARI NONE. Example: PARI EVEN SIM964 Analog Limiter...

  • Page 26: Status Commands

    2 – 10 Remote Operation 2.4.7 Status Commands The Status commands query and configure registers associated with status reporting of the SIM964. *STB? [i] Status Byte Reads the Status Byte register [bit i]. Execution of the *STB? query (without the optinal bit i) always causes the STATUS signal to be deasserted.

  • Page 27: Interface Commands

    At power-on, PSTA is set to OFF. Example: PSTA? 2.4.8 Interface Commands Interface commands provide generic control over the interface be- tween the SIM964 and the host computer. *RST Reset Reset the SIM964 to default configuration. The following commands are internally executed upon *RST: ULIM +10.00...
  • Page 28 2 – 12 Remote Operation *IDN? Identify Read the device identification string. The identification string is formatted as: Stanford Research Systems,SIM964,s/n******,ver#.# where ****** is the 6-digit serial number, and #.# is the firmware revision level. Example: *IDN? Stanford Research Systems,SIM964,s/n003075,ver1.0...
  • Page 29 Query the last button-press code. A query of LBTN? always clears the button code, so a subsequent LBTN? will return 0. Valid codes are: Value Definition no button pressed since last LBTN? [UL ] [UL ] [LL ] [LL ] [UL ] [LL ] Example: LBTN? SIM964 Analog Limiter...
  • Page 30 LFCR 4) . The term sequence is appended to all query responses sent by the module, and is constructed of ASCII character(s) 13 (car- riage return) and 10 (line feed). The token mnemonic gives the sequence of characters. At power-on, TERM is set to CRLF. Example: TERM? SIM964 Analog Limiter...

  • Page 31: Status Model

    OPC: Operation Complete OVLD Figure 2.1: Status Register Model for the SIM964. There are three categories of registers in the SIM964 status model: Condition Registers : These read-only registers correspond to the real-time condi- tion of some underlying physical property being monitored.

  • Page 32: Status Byte (Sb)

    Remote Operation 2.5.1 Status Byte (SB) The Status Byte is the top-level summary of the SIM964 status model. When masked by the Service Request Enable register, a bit set in the Status Byte causes the STATUS signal to be asserted on the rear- panel SIM interface connector.

  • Page 33: Service Request Enable (Sre)

    Input Bu er. QYE : Query Error. Indicates data in the Output Queue has been lost. DDE : Device Dependent Error. Indicates a SIM964 had a delayed execution error, due to an illegal mode state. The error code can be queried with LDDE?.

  • Page 34: Standard Event Status Enable (Ese)

    OVR : Input Bu er Overrun. Set when the Input Bu er is overrun by incoming data. Causes the Input Bu er to be flushed, and resets the command parser. RTSH : RTS Holdo Event. Not implemented in the SIM964. SIM964 Analog Limiter...

  • Page 35: Communication Error Status Enable (Cese)

    2 – 19 CTSH : CTS Holdo Event. Not implemented in the SIM964. DCAS : Device Clear. Indicates the SIM964 received the Device Clear signal (an RS-232 break ). Clears the Input Bu er and Output Queue, and resets the command parser.
  • Page 36 2 – 20 Remote Operation SIM964 Analog Limiter...
  • Page 37 3 Parts Lists and Schematics This chapter presents a brief description of the SIM964 circuit design. A complete parts list and circuit schematics are included. In This Chapter 3.1 Circuit Descriptions ....3 – 2 3.1.1...

  • Page 38: Circuitry

    3 – 2 Circuitry 3.1 Circuit Descriptions Ths SIM964 consists of two separate printed circuit boards: the main board, and the front-panel board. 3.1.1 Microcontroller The SIM964 is controlled by microcontroller U103. The controller is cloced at 5 MHz. A critical aspect of the design is the clock-stop circuitry implemented by U111 and U102.

  • Page 39: Input Overload Detection

    R302 R304 no longer has a sink at U303s output. When this happens, the feedback path from U303s output, through U305, and back to U303s noninverting input, stably holds U303s output about one diode drop above the upper limit. SIM964 Analog Limiter...

  • Page 40: Output Cicuit

    BUF634 without su ering its large input o set volt- age, since the output of U602 is servoed to the noninverting input of U601 via the feedback resistor R605. A 49.9 resistor (R604) is in series with the output. SIM964 Analog Limiter...

  • Page 41: Parts Lists

    R104,R112,R113,R122 4-01527 100K U310,U308 3-01327 THS4082 R105 4-01511 22K U401,U402,U403,U404,U405, 3-00672 74HC595ADT R107 4-01431 10 U406,U407 R114,R118,R123,R124,R125, 4-01503 10K U501,U505 3-01424 HDSP-A107 R126 U502,U503,U504,U506,U507, 3-00290 HDSP-A101 R115,R117,R119 4-01465 270 U508 R116,R120,R121,R127,R128, 4-01455 100 U602 3-01221 BUF634 R129,R130 SIM964 Analog Limiter...

  • Page 42: Schematic Diagrams

    3 – 6 Circuitry 3.3 Schematic Diagrams Schematic diagrams follow this page. SIM964 Analog Limiter...

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