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SRS Labs SIM922 Operation And Service Manual

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Operation and Service Manual
Diode Temperature Monitor
SIM922
Stanford Research Systems
Revision 1.5
September 17, 2010

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Summary of Contents for SRS Labs SIM922

  • Page 1 Operation and Service Manual Diode Temperature Monitor SIM922 Stanford Research Systems Revision 1.5 September 17, 2010...
  • Page 2 Copyright c Stanford Research Systems, Inc., 2003, 2010. 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 9-01556-903 SIM922 Diode Temperature Monitor...

  • Page 3: Table Of Contents

    Contents General Information Service ......Symbols ......Notation .
  • Page 4 Contents SIM922 Diode Temperature Monitor...

  • Page 5: General Information

    Do not install substitute parts or perform any unauthorized modifi- cations to this instrument. The SIM922 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

    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) SIM922 Diode Temperature Monitor...

  • Page 7: Notation

    Front-panel buttons are set as [Button]; [Adjust ] is shorthand for “[Adjust ] & [Adjust ]”. Front-panel indicators are set as Overload. Remote command names are set as *IDN?. Literal text other than command names is set as OFF. SIM922 Diode Temperature Monitor...

  • Page 8: Specifications

    Serial (RS-232) through SIM interface Connectors 2 DB–9 (female) 4–wire measurement ground (Ch 1 & 2) 4–wire measurement ground (Ch 3 & 4) DB–15 (male) SIM interface Weight 1.4 lbs Dimensions 1 5 W 3 6 H 7 0 D SIM922 Diode Temperature Monitor...

  • Page 9: Getting Started

    1 Getting Started This chapter gives you the necessary information to get started quickly with the SIM922 Diode Temperature Monitor. In This Chapter 1.1 Introduction to the Instrument ... . . 1 – 2 1.1.1...

  • Page 10: Introduction To The Instrument

    1.1.1 Overview Each channel has an independent, precision 10 A current source, so the excitation to the user’s sensor remains steady as the SIM922 cycles between measurements. Disabling a channel switches that channel’s current source o . A precision 24–bit analog-to-digital converter is cycled between the channels with a rate of 4 conversions per second.

  • Page 11: Sensor Interface

    The actual curve to use is selected with the remote interface CURV command. 1.3 Sensor Interface The sensor interface on the SIM922 consists of two rear-panel DB–9 F connectors, labeled “CHANNELS 1 & 2” and “CHANNELS 3 & 4” (see Figure 1.1). Both connectors follow the same pinout, given in Table 1.1...

  • Page 12: Four-Wire Measurement

    1 – 4 Getting Started 1.3.1 Four-wire measurement To avoid sensitivity to wiring lead resistance, the SIM922 is config- ured for four-wire measurements. The basic circuit for this wiring scheme is shown in Figure 1.2. Figure 1.2: Wiring diagram for four-wire readout.

  • Page 13: 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 SIM922 directly, without using the SIM900 Mainframe. This section provides details on the interface.
  • Page 14 RS-232 serial port of a personal computer. Connect RXD from the SIM922 directly to RD on the PC, TXD directly to TD, and similarly RTS RTS and CTS CTS. In other words, a null-modem style cable is not needed.
  • Page 15 (non-RS-232-standard) baud rates: 62500, 78125, 104167, 156250. Note that these rates are typically not accessible on a standard PC RS-232 port, but can be used between the SIM922 and the SIM900 Mainframe. SIM922 Diode Temperature Monitor...
  • Page 16 1 – 8 Getting Started SIM922 Diode Temperature Monitor...

  • Page 17: Remote Operation

    2 Remote Operation This chapter describes operating the SIM922 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

    2 – 12 Clear Status *STB? [i] 2 – 12 Status Byte *SRE(?) [i,] j 2 – 12 Service Request Enable *ESR? [i] 2 – 12 Standard Event Status *ESE(?) [i,] j 2 – 12 Standard Event Status Enable SIM922 Diode Temperature Monitor...
  • Page 19 2 – 14 Execution Error LCME? 2 – 15 Device Error LDDE? 2 – 15 Device Error 2 – 15 Button LBTN? TOKN(?) z 2 – 15 Token Mode TERM(?) z 2 – 16 Response Termination SIM922 Diode Temperature Monitor...

  • Page 20: Alphabetic List Of Commands

    2 – 10 Frequency of Power Line Cycle LBTN? 2 – 15 Button LCME? 2 – 15 Device Error LDDE? 2 – 15 Device Error LEXE? 2 – 14 Execution Error OVSE(?) [i,] j 2 – 13 Overload Status Enable SIM922 Diode Temperature Monitor...
  • Page 21 SOUT 2 – 9 Stop Streaming TERM(?) z 2 – 16 Response Termination TOKN(?) z 2 – 15 Token Mode TVAL? c [,n] 2 – 9 Temperature Value VOLT? c [,n] 2 – 9 Voltage Value SIM922 Diode Temperature Monitor...

  • Page 22: Introduction

    SIM922 is left unchanged; to reset the instrument, see *RST. The Device Clear signal will also terminate any streaming outputs from the SIM922 due to a TVAL? or RVAL? query of multiple conver- sions. SIM922 Diode Temperature Monitor...

  • Page 23: Commands

    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. SIM922 Diode Temperature Monitor...

  • Page 24: Notation

    Literal token Arbitrary character sequence (no “,” or “;”) Required for queries; illegal for set commands Parameter always required Required parameter for set commands; illegal for queries [var] Optional parameter for both set and query forms SIM922 Diode Temperature Monitor...

  • Page 25: Readout Commands

    Turn o streaming output. 2.4.4 Excitation commands EXON(?) c ,z Excitation On O Set (query) the Channel c excitation current to z (OFF 0, ON 1) . If c 0, then all four channel excitation states are set (queried). SIM922 Diode Temperature Monitor...

  • Page 26: Display & Configuration Commands

    2.4.6 Sensor calibration commands In addition to the built-in curve, each channel has a dedicated 256- point non-volatile memory for storing user calibration curves. Once loaded, these curves are retained by the SIM922 though power cycles. CINI(?) c ,z,s Initialize Sensor Calibration Initialize sensor calibration curve for channel c.

  • Page 27: Serial Communication Commands

    At power-on, the baud rate defaults to 9600. Actual baud rate settings depend on implementation details of the SIM922, based on modulo prescalars of the 10 MHz system clock. As a result, queries of BAUD? will in general be slightly di erent from the set values.

  • Page 28: Status Commands

    At power-on, the SIM922 defaults to PARI NONE. 2.4.8 Status commands The Status commands query and configure registers associated with status reporting of the SIM922. See Section 2.5 for more details. *CLS Clear Status *CLS immediately clears the ESR, CESR, and the OVSR.

  • Page 29: Interface Commands

    STATUS low until a *STB? query is received. At power-on, PSTA is set to OFF. 2.4.9 Interface commands *RST Reset Reset the SIM922 to default configuration. The following commands are internally executed upon *RST: EXON 0,ON CURV 0,STAN DTEM ON...
  • Page 30 Execution Error Query the last execution error code. Valid codes are: Value Definition No execution error since last LEXE? Illegal value Wrong token Invalid bit Uninitialized curve Curve full Curve point out-of-order Curve point past end SIM922 Diode Temperature Monitor...
  • Page 31 Token Mode Set (query) the Token Query mode to z (OFF 0, ON 1) . If TOKN ON is set, then queries to the SIM922 that return tokens will return the text keyword; otherwise they return the decimal integer value.
  • Page 32 LFCR 4) . The term sequence is appended to all query responses sent by the module, and is constructed of ASCII character(s) 13 (carriage return) and or 10 (line feed). At power-on, TERM CRLF is set. SIM922 Diode Temperature Monitor...

  • Page 33: Status Model

    The SIM922 status registers follow the hierarchical IEEE–488.2 for- mat. A block diagram of the status register array is given in Figure 2.1. There are two categories of registers in the SIM922 status model: Event Registers : These read-only registers record the occurrence of defined events.

  • Page 34: Status Byte (Sb)

    Remote Operation 2.5.1 Status Byte (SB) The Status Byte is the top-level summary of the SIM922 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 35: 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 SIM922 had a delayed execution error, due to an illegal mode state. The error code can be queried with LDDE?.

  • Page 36: 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 : Undefined for the SIM922. Command Error. Indicates a parser- detected error. CTSH : Undefined for the SIM922.

  • Page 37: Communication Error Status Enable (Cese)

    The OVSE acts as a bitwise AND with the OVSR register to produce the single bit OVSB message in the Status Byte Register (SB). It can be set and queried with the OVSE(?) command. This register is cleared at power-on. SIM922 Diode Temperature Monitor...

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