Introducing Message-Based DAQ

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CJC Message Device response Description "?AI{ch}:CJC/format" "AI{ch}:CJC/format=value" Returns the CJC value in the specified format. format = DEGC, DEGF, KELVIN value = measured temperature Example: "?AI{0}:CJC/DEGC" STATUS Message Device response Description "?AI:STATUS" "AI:STATUS=value" Returns the current ADC status of the AI operation. value = BUSY, ERROR, or READY SLOPE Message Device response Description "?AI{ch}:SLOPE" "AI{ch}:SLOPE=value" Returns the calibration slope coefficient for the specified channel. ch = channel number value = calibration slope Example: "?AI{0}:SLOPE" OFFSET Message Device response Description "?AI{ch}:OFFSET" "AI{ch}:OFFSET=value" Returns the calibration offset coefficient for the specified channel. ch = channel number value = calibration offset Example: "?AI{0}:OFFSET" CAL 1 Message Device response Description "AI:CAL=value" "AI:CAL" Enables or disables calibration of all A/D channels. value = ENABLE or DISABLE Example: "AI:CAL=ENABLE" "?AI:CAL" "AI:CAL=value" Returns a value indicating whether the calibration coefficients will be applied to the raw A/D data. value = ENABLE or DISABLE Example: "?AI:CAL" 1 These messages are processed by the DAQFlex Software library, and are not sent to the device. Page 18 of 43
SCALE 1 Message Device response Description "AI:SCALE=value" "AI:SCALE" Enables or disables scaling of A/D channels. value = ENABLE or DISABLE Example: "AI:SCALE=ENABLE" "?AI:SCALE" "AI:SCALE=value" Returns a value indicating whether scaling will be applied to the A/D channels. value = ENABLE or DISABLE 1 These messages are processed by the DAQFlex Software library, and are not sent to the device. Working with the CAL and SCALE properties The ENABLE/DISABLE setting of the CAL and SCALE properties affect the kind of data that is returned: • CAL=DISABLE, SCALE=DISABLE If CAL and SCALE are both disabled, the data returned will be raw A/D integer values within the range of 0 to 2 res olution -1 of the device. If the calibration factors are stored on the device and applied to the data by the application software, the data range may be limited to well within these values. • CAL=ENABLE, SCALE=DISABLE When CAL is enabled and SCALE is disabled, the format of the analog data returned will depend on the type of calibration implemented. If the calibration factors are stored on the device and applied to the data by the application software, the data will be floating point values, not integer values, and may exceed the theoretical limits and include negative values and values above 2 res olution -1. • SCALE=ENABLE When SCALE is enabled, scaled floating point values are returned. The limits of the data will depend on the implementation of calibration, as described above. Data range limits may be a small percentage less than or greater than the full scale range selected for devices for which the calibration factors are stored on the device and applied to the data by the application software. Page 19 of 43
Page 11 and 12: Analog input scan operation C# Visu
Page 13 and 14: DEV Sets and gets device property v
Page 15: RESET Message Device response Descr
Page 21 and 22: SAMPLES Message Device response Des
Page 23: LOWCHAN Message Device response Des
Page 26 and 27: CAL 1 Message Device response Descr
Page 28 and 29: AO Sets and gets property values fo
Page 30 and 31: DIO Sets and gets property values f
Page 34 and 35: Note: Click Send Message after chan
Page 42 and 43: Programming and developing applicat

Introducing Message-Based DAQ

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