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SRS Labs SIM922A Operation And Service Manual

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Operation and Service Manual
Diode Temperature Monitor
SIM922A
Stanford Research Systems
Revision 1.3
August 24, 2006

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  • Page 1 Operation and Service Manual Diode Temperature Monitor SIM922A Stanford Research Systems Revision 1.3 August 24, 2006...
  • Page 2 Copyright c Stanford Research Systems, Inc., 2004, 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 9-01579-903 SIM922A Diode Temperature Monitor...

  • Page 3: Table Of Contents

    Contents General Information Service ......Symbols ......Notation .
  • Page 4 Contents SIM922A Diode Temperature Monitor...

  • Page 5: General Information

    Do not install substitute parts or perform any unauthorized modifi- cations to this instrument. The SIM922A 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) SIM922A 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. SIM922A Diode Temperature Monitor...

  • Page 8: Specifications

    50 ( 15 V), 250 ( 5 V) General Characteristics Interface Serial (RS-232) through SIM interface Connectors DB–9 (female) 4–wire measurement ground DB–15 (male) SIM interface Weight 1.4 lbs Dimensions 1 5 W 3 6 H 7 0 D SIM922A Diode Temperature Monitor...

  • Page 9: Getting Started

    1 Getting Started This chapter gives you the necessary information to get started quickly with the SIM922A Diode Temperature Monitor. In This Chapter 1.1 Introduction to the Instrument ... . 1 – 2 1.1.1...

  • Page 10: Introduction To The Instrument

    New sensor measurements are available at a rate of 5 conversions per second. 1.2 Front-Panel Operation The front panel of the SIM922A(see Figure 1.1) provides a simple operator interface. Figure 1.1: The SIM922A front and rear panels. SIM922A Diode Temperature Monitor...

  • Page 11: Excitation

    EXON remote interface command. 1.2.2 Units The SIM922A displays the results either as raw sensor units (in volts) or temperature (in kelvin). Pressing [Units] toggles between these two modes; the active units are indicated by the illuminated K, or V (or mV ).

  • Page 12: Sensor Interface

    T set ). Relative mode can also be controlled with the AMOD remote interface command. 1.3 Sensor Interface The sensor interface on the SIM922A consists of a rear-panel DB–9 F connector (see Figure 1.1). The connector pinout is given in Table 1.1 Signal ground 6–9...

  • Page 13: Two-Wire Measurement

    1.3.2 Two-wire measurement If application-specific constraints limit the number of leads to the sensor, the SIM922A can be wired to measure the sensor resistance with a simple two-wire circuit, shown in Figure 1.3. Note that the lead resistance (past the junction points of the current and voltage leads) will add as a direct resistance error when measuring the sensor.

  • Page 14: Sim Interface

    Mainframe slots, or the remote cable interface. It is also possible to operate the SIM922A directly, without using the SIM900 Mainframe. This section provides details on the interface. The SIM922A has no internal protection against reverse polarity, missing CAUTION supply, or overvoltage on the power supply pins.
  • Page 15 RS-232 serial port of a personal computer. Connect RXD from the SIM922A 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 16 BAUD, FLOW, or PARI commands. The maximum standard baud rate that the SIM922A supports is 38400. The minimum baud rate is 110. Above 38400, the SIM922A can be set to the following (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 SIM922A and the SIM900 Mainframe.

  • Page 17: Remote Operation

    2 Remote Operation This chapter describes operating the SIM922A over the serial inter- face. 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 Initialize Sensor Calibration CAPT f,g 2 – 12 Add User Curve Point CAPT? j 2 – 13 Query User Curve Point CURV(?) z 2 – 13 Select Sensor Curve Serial Communications BAUD(?) i 2 – 13 Baud Rate SIM922A Diode Temperature Monitor...
  • Page 19 2 – 16 Operation Complete LEXE? 2 – 16 Execution Error LCME? 2 – 17 Device Error LBTN? 2 – 17 Button TOKN(?) z 2 – 17 Token Mode TERM(?) z 2 – 18 Response Termination SIM922A Diode Temperature Monitor...

  • Page 20: Alphabetic List Of Commands

    2 – 11 Display Enable Disable EXON(?) z 2 – 11 Excitation On O FLOW(?) z 2 – 13 Flow Control FPLC(?) i 2 – 11 Frequency of Power Line Cycle LBTN? 2 – 17 Button SIM922A Diode Temperature Monitor...
  • Page 21 2 – 17 Token Mode TSET(?) f 2 – 10 Temperature Setpoint TVAL? [n] 2 – 9 Temperature Value VKEL(?) f 2 – 10 Temperature Scale Factor VOLT? [n] 2 – 9 Voltage Value VSCA? 2 – 10 Internal Scale SIM922A Diode Temperature Monitor...

  • Page 22: Introduction

    SIM922A is left unchanged; to reset the instrument, see *RST. The Device Clear signal will also terminate any streaming outputs from the SIM922A due to a TVAL?, TDEV?, or VOLT? query of mul- tiple conversions. SIM922A 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. SIM922A 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 SIM922A Diode Temperature Monitor...

  • Page 25: Readout Commands

    If n 0, the conversion results con- tinue indefinitely. To terminate the stream before n results (or when n 0), issue the SOUT command. Note that omitting n is equivalent to n 1. SOUT Stop Streaming Turn o streaming output. SIM922A Diode Temperature Monitor...

  • Page 26: Setpoint And Analog Output Commands

    The resulting sensor measurements are then available at a rate of 5 per second. When CHOP OFF, the SIM922A uses the most recently determined scale and o set without further internal calibration, and all ADC conversions are of the sensor.

  • Page 27: Excitation Commands

    Display Enable Disable Set (query) the front panel display to z (OFF 0, ON 1) . The DISX setting is not stored in non-volatile memory. At power-on, the SIM922A returns to DISX ON. DISP(?) z Display Mode Set (query) the display mode to z (VOLT 0, TEMP 1, or TSET 2) .

  • Page 28: Sensor Calibration Commands

    2 – 12 Remote Operation 2.4.7 Sensor calibration commands In addition to the built-in curve, the SIM922A has a dedicated 1024- point non-volatile memory for storing user calibration data. Once loaded, this curve is retained by the SIM922A though power cycles.

  • Page 29: Serial Communication Commands

    At power-on, the baud rate defaults to 9600. Actual baud rate settings depend on implementation details of the SIM922A, 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 30: Status Commands

    At power-on, the SIM922A defaults to PARI NONE. 2.4.9 Status commands The Status commands query and configure registers associated with status reporting of the SIM922A. See Section 2.5 for more details. *CLS Clear Status *CLS immediately clears the ESR, CESR, and the OVSR.

  • Page 31: Interface Commands

    STATUS low until a *STB? query is received. At power-on, PSTA is set to OFF. 2.4.10 Interface commands *RST Reset Reset the SIM922A to default configuration. The following commands are internally executed upon *RST: DISX ON EXON ON CURV STAN...
  • Page 32 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 Illegal temperature value No Excitation SIM922A Diode Temperature Monitor...
  • Page 33 Token Mode Set (query) the Token Query mode to z (OFF 0, ON 1) . If TOKN ON is set, then queries to the SIM922A that return tokens will return the text keyword; otherwise they return the decimal integer value.
  • Page 34 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. SIM922A Diode Temperature Monitor...

  • Page 35: Status Model

    The SIM922A 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 three categories of registers in the SIM922A status model: Condition Registers : These read-only registers correspond to the real-time condi- tion of some underlying physical property being monitored.

  • Page 36: Status Byte (Sb)

    Remote Operation 2.5.1 Status Byte (SB) The Status Byte is the top-level summary of the SIM922A 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 37: Service Request Enable (Sre)

    Input Bu er. QYE : Query Error. Indicates data in the Output Queue has been lost. DDE : Device Dependent Error. Not used in the SIM922A. EXE : Execution Error. Indicates an error in a command that was successfully parsed. Out-of-range parameters are an example.

  • Page 38: Communication Error Status (Cesr)

    Indicates a parser-detected error. CTSH : Undefined for the SIM922A. DCAS : Device Clear. Indicates the SIM922A received the Device Clear signal (an RS-232 break ). Clears the Input Bu er and Output Queue, and resets the command parser. 2.5.6 Communication Error Status Enable (CESE) The CESE acts as a bitwise AND with the CESR register to produce the single bit CESB message in the Status Byte Register (SB).

  • Page 39: Overload Status (Ovcr)

    2.5.7 Overload Status (OVCR) The Overload Condition Register consists of 7 single-bit monitors of condition events within the SIM922A. Bits in the OVCR reflect the real-time values of their corresponding signals. Reading the entire register, or individual bits within it, does not a ect the OVCR.

  • Page 40: Overload Status Enable (Ovse)

    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. SIM922A Diode Temperature Monitor...

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