Sensoray 417 Manual de usuario Pagina 1

Sensoray Model 417ISAbus Thermocouple InterfaceJuly 13, 2000

9 Sensoray Model 417Chapter 4 ProgrammingSample DriversWe recommend that you incorporate procedures in your application software that will conceal the

Instruction Manual 10‘*******************************************************************‘ Read a signed, 16-bit integer value from the 417, MSB first

11 Sensoray Model 417Chapter 4 ProgrammingC Language Drivers//======================================================// Write a command byte to the 417

Instruction Manual 1280x86 Assembly Language Drivers;***********************************************************; Handshake a command byte into the 41

13 Sensoray Model 417Chapter 4 ProgrammingCommandsThe 417 is accessed through a simple yet powerful built-in command set. Commands vary in length depe

Instruction Manual 14Set Sensor TypeThis command declares the type of sensor connected to a channel. Typically, this command is exe-cuted once for eac

15 Sensoray Model 417Chapter 4 ProgrammingSet FilterThis command establishes a software single-pole low-pass filter for the specified channel. The sec

Instruction Manual 16Read ReferenceThis command returns the reference temperature from optional Sensoray termination boards (TBs), such as Models 7409

17 Sensoray Model 417Chapter 4 ProgrammingRead ChannelThis command returns the most recently acquired sensor data from one channel. The returned value

Instruction Manual 18Read Channel GroupThis command returns the most recent sensor data from a group of eight channels. Sensor data is scaled as a fun

ChapterTable of ContentsChapter 1: Basics . . 1Limited Warranty . . 1Special Handling Instructions . . 1Chapter 2: Introduction . . 2Functional Descri

19 Sensoray Model 417Chapter 4 ProgrammingSet LimitsThis command declares signed, 16-bit integer, upper and lower alarm threshold limits for a chan-ne

Instruction Manual 20Set Fail ModeThis command establishes open sensor data values for a group of eight channels. The first com-mand byte contains the

21 Sensoray Model 417Chapter 4 ProgrammingRead AlarmsThis command (1) returns alarm status from a group of eight channels, and (2) clears the alarm st

Instruction Manual 2250Hz Reject ModeThis command changes the digitizer’s integration period from 16.7ms to 20.0ms, enabling the coprocessor to reject

23 Sensoray Model 417Chapter 4 ProgrammingHigh Speed ModeThis command increases the the channel scan rate to allow higher throughput. Channel processi

Instruction Manual 24Read VersionThis command returns the coprocessor firmware version number, times 100. The version number is printed on the EPROM d

25 Sensoray Model 417Chapter 4 ProgrammingRead IdentifierThis command returns a product identifier specific to the Model 417 board. The command respon

Instruction Manual 26CalibrateThis command calibrates one of the coprocessor’s internal standards. You must supply two stable references, 5V and 500mV

27 Sensoray Model 417Chapter 4 ProgrammingSensor TableNotes:Scale Factors: The Scale Factor for each sensor type is shown above in the Resolution colu

Instruction Manual 28

Chapter1Basics1Limited WarrantySensoray Company, Incorporated (Sensoray) warrants the Model 417 hardware to be free from defects in material and workm

Chapter5Sensor Connections5ConnectorsAnalog input signals connect to the 417 board by means of header connectors P1 and P2. Header P1 provides connect

Instruction Manual 30Termination BoardsTo simplify field wiring, sensors may be connected to optional Sensoray screw termination boards, such as Model

31 Sensoray Model 417Chapter 5 Sensor Connections4-to-20 mA Current LoopsA 250Ω, 0.01% resistor must be installed as shown below. These resistors are

Chapter6Thermocouples6OverviewA thermocouple (TC) consists of a conductor pair constructed from dissimilar metals. At one end of the pair, the two con

Chapter7Theory of Operation7SoftwareExecution of the embedded coprocessor firmware is managed by a multitasking kernel. The kernel is responsible for

Instruction Manual 36HardwareAlthough the coprocessor’s analog circuitry is proprietary to Sensoray, an overview of the cir-cuitry is provided here to

37 Sensoray Model 417Chapter 7 Theory of OperationChannel selection, amplifier gain, and A/D functions are all under direct control of the copro-cesso

Instruction Manual 38Communication LatencyCommunication latency is a measure of communication delays between host and 417. Perhaps the most important

Chapter2Introduction2Functional DescriptionThe Model 417 circuit board interfaces 32 process sensors directly to the ISAbus. Each of its 32 sensor cha

3 Sensoray Model 417Chapter 2 IntroductionSpecificationsTable 1: General SpecificationsParameterConditionSpecificationMin Typ Max UnitsDC Input power

Chapter3Hardware Configuration3Base AddressBefore you install the coprocessor board in your system, its base I/O address must be set. The base address

Instruction Manual 6ExampleSet the base address to 0390:Nibble3 = 0, so install A15-A12.Nibble2 = 3, so install A11-A10 and remove A9-A8.Nibble1 = 9,

Chapter4Programming4The Model 417 is programmed by means of commands. Commands are sent from the ISAbus mas-ter—the “host” processor—to the 417. Some

Instruction Manual 8Status register bits have the following functions:Control RegisterThe control register provides a means for forcing a coprocessor