DAQ SCXI-1102 User Manual
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Contents
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Chapter 4 Theory of OperationSCXI-1102/B/C User Manual4-2 ©National Instruments CorporationThe major components of the SCXI-1102/B/C modules are as follows:• Rear signal connector• SCXIbus connector• SCXIbus interface• Digital control circuitry• Analog circuitryThe SCXI-1102/B/C modules consist of 32 multiplexed input channels,each with a software-programmable gain of 1 or 100. Each inputchannel has its own lowpass filter. The SCXI-1102/B/C modules alsohave a digital section for automatic control of channel scanning,temperature sensor selection, and gain selection.Rear Signal Connector, SCXIbus Connector, and SCXIbus InterfaceThe SCXIbus controls the SCXI-1102/B/C module. The SCXIbusinterface connects the rear signal connector to the SCXIbus, allowing aDAQ device to control the SCXI-1102/B/C module and the rest of thechassis.Digital Control CircuitryThe digital control circuitry consists of the Address Handler and thefollowing registers: Module ID, Configuration, Status, EEPROM, Gain,and Channel. The Address Handler controls which register is beingaddressed. The Module ID Register contains a code unique to each typeof SCXI-1102 module:♦ SCXI-1102—The Module ID is 30 decimal.♦ SCXI-1102B—The Module ID is 31 decimal.♦ SCXI-1102C—The Module ID is 62 decimal.The Configuration Register configures the SCXI-1102/B/C modules forthe desired scanning mode and connection to the rear signal connector.The Status Register indicates whether the input channels have settledafter a change in the gains. The EEPROM Register is the address forinterfacing with the module EEPROM, which contains calibrationinformation. The Gain Register selects between gains of 1 or 100 foreach of the 32 channels. The Channel Register selects a channel for asingle measurement or a start channel for a scan. Refer to |
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