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SRS Labs SIM923 Operation And Service Manual

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Operation and Service Manual
Pt RTD Monitor
SIM923
Stanford Research Systems
Revision 1.7
May 8, 2007

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Summary of Contents for SRS Labs SIM923

  • Page 1 Operation and Service Manual Pt RTD Monitor SIM923 Stanford Research Systems Revision 1.7 May 8, 2007...
  • Page 2 Copyright c Stanford Research Systems, Inc., 2003, 2007. 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 9-01557-903 SIM923 Pt RTD Monitor...

  • Page 3: Table Of Contents

    Contents General Information Service ......Symbols ......Notation .
  • Page 4 Contents SIM923 Pt RTD Monitor...

  • Page 5: General Information

    Do not install substitute parts or perform any unauthorized modifi- cations to this instrument. The SIM923 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) SIM923 Pt RTD 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. SIM923 Pt RTD 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 SIM923 Pt RTD Monitor...

  • Page 9: Getting Started

    1 Getting Started This chapter gives you the necessary information to get started quickly with the SIM923 Pt RTD Monitor. In This Chapter 1.1 Introduction to the Instrument ... . . 1 – 2 1.1.1...

  • Page 10: Introduction To The Instrument

    1 – 2 Getting Started 1.1 Introduction to the Instrument The SIM923 Pt RTD Monitor monitors up to four (4) resistive tem- perature detectors (RTDs) using a stable 1 mA DC current excitation. 1.1.1 Overview The SIM923 uses a ratiometric design, where the excitation current is passed through both an internal, stable reference resistor and the user’s resistive thermometer.

  • Page 11: Current Reversal

    1.2.3 Current reversal To test for any voltage o sets in the measurement, the user may command the SIM923 to reverse the excitation current. Any ther- moelectric or amplifier o sets will remain unchanged under current reversal, while the true resistive signal will be inverted.

  • Page 12: Sensor Interface

    1 – 4 Getting Started 1.3 Sensor Interface The sensor interface on the SIM923 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 13: Two-Wire Measurement

    1.3.2 Two-wire measurement If application-specific constraints limit the number of leads to the sensor, the SIM923 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

    1 – 6 Getting Started 1.4 SIM Interface The primary connection to the SIM923 Pt RTD Monitor is the rear- panel DB–15 SIM interface connector. Typically, the SIM923 is mated to a SIM900 Mainframe via this connection, either through one of the internal mainframe slots, or the remote cable interface.
  • Page 15 RS-232 serial port of a personal computer. Connect RXD from the SIM923 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 (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 SIM923 and the SIM900 Mainframe. SIM923 Pt RTD Monitor...

  • Page 17: Remote Operation

    2 Remote Operation This chapter describes operating the SIM923 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

    PARI(?) z 2 – 12 Parity Status *CLS 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 SIM923 Pt RTD Monitor...
  • Page 19 2 – 14 Execution Error LCME? 2 – 15 Device Error 2 – 15 Device Error LDDE? LBTN? 2 – 15 Button TOKN(?) z 2 – 15 Token Mode TERM(?) z 2 – 16 Response Termination SIM923 Pt RTD Monitor...

  • Page 20: Alphabetic List Of Commands

    2 – 10 Frequency of Power Line Cycle IPOL(?) z 2 – 9 Current Polarity LBTN? 2 – 15 Button LCME? 2 – 15 Device Error LDDE? 2 – 15 Device Error LEXE? 2 – 14 Execution Error SIM923 Pt RTD Monitor...
  • Page 21 RVAL? c [,n] 2 – 9 Resistance Value SOUT 2 – 9 Stop Streaming TERM(?) z 2 – 16 Response Termination TOKN(?) z 2 – 15 Token Mode 2 – 9 Temperature Value TVAL? c [,n] SIM923 Pt RTD Monitor...

  • Page 22: Introduction

    SIM923 is left unchanged; to reset the instrument, see *RST. The Device Clear signal will also terminate any streaming outputs from the SIM923 due to a TVAL? or RVAL? query of multiple conver- sions. SIM923 Pt RTD 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. SIM923 Pt RTD 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 SIM923 Pt RTD Monitor...

  • Page 25: Readout Commands

    If c 0, then all four channel excitation states are set (queried). IPOL(?) z Current Polarity Set (query) the excitation polarity to z (POSITIVE 0, NEGATIVE 1 ) . All four channels are switched together by IPOL. SIM923 Pt RTD Monitor...

  • Page 26: Display & Configuration Commands

    2.4.6 Sensor calibration commands In addition to the built-in DIN-43760 Pt–100 curve, each channel has a dedicated 256-point non-volatile memory for storing user calibration curves. Once loaded, these curves are retained by the SIM923 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 SIM923, 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 SIM923 defaults to PARI NONE. 2.4.8 Status commands The Status commands query and configure registers associated with status reporting of the SIM923. 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 SIM923 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 SIM923 Pt RTD 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 SIM923 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. SIM923 Pt RTD Monitor...

  • Page 33: Status Model

    The SIM923 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 SIM923 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 SIM923 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 SIM923 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 SIM923. Command Error. Indicates a parser- detected error. CTSH : Undefined for the SIM923.

  • 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. SIM923 Pt RTD Monitor...

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