Omega Vehicle Security OM-550 manual Programmed Features, Data Cache

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2.4 PROGRAMMED FEATURES

There are special programmed features that support the operation of the OM-550. These features are described in the following sections.

2.4.1 DATA CACHE

The OM-550 contains a 28 Kbyte data cache that retains its data even when the unit is “OFF”. Each data point occupies four bytes of cache memory; thus the capacity of the cache depends upon the quantity of active (unskipped) channels.

ACTIVE CHANNELS	CACHE CAPACITY
1	7000 scans
2	3500 scans
3	2333 scans
4	1750 scans
5	1400 scans

When the RUN or PROG keys are pressed, the cache is automatically erased. Do not press RUN or PROG until the data has been transferred to a PC, otherwise it will be lost.

During a Manual Reset, 100 "phony" data readings will automatically be logged to the cache, as CH 1 & CH 2 data. The statistics for this artificial data can be viewed by pressing the STOP key after executing a Manual Reset, explained in APPENDIX A:

CALIBRATION.

The artificial data is a functional test of the unit and can also be used to ensure that the RS-232 port connection to a PC is functioning properly. When the data is transferred to a PC, it will graph as a straight line with constant, increasing slope.

The Math channel data is not saved to cache. It is calculated and "transferred" to the PC durring upload (refer to section 4.5 MATH PSEUDO-CHANNELfor more information).

OM-550

u15u

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Contents Table of Contents Date Time Introduction ∙ The OM-550 Datalogger may be referred to as LoggerOperator Safety Information Product Usage WarningsFor protection of the OM-550 itself, observe the following Unpacking OM-550 features FeaturesOM-550 Features Activity LED & Horn Keypad ∙ ON-OFF ∙ RUN ∙ OK ∙ Stop∙ PROG/EXIT Application Channel Connectors∙ Optional Connectors Printer Window To remove the Viewing WindowBattery Cover Thermal PaperDC Jack Serial Data PortGain Adjust Tilt StandPower Supplies Inputs Voltage Transducer InputsProbes Probe SETThermocouple Inputs TypeProgrammed Features Data CacheStatistics Battery Check POWER-SAVE ModeLOW Battery Operation Power Connection Battery InstallationConnecting the AC Power Adapter Connecting the DC Power CablePaper Installation Data Port Connection PIN AdapterProgramming ∙ Programming outline 1. Select ChannelProgramming Keys Print Formatting PositionTemperature Channels Voltage ChannelsMath PSEUDO-CHANNEL Not Printing LOG IntervalThis Interval Overrun can be avoided in two ways Operation AT Full Cache Recording Time Temperature Units Rejection FrequencyCalibration Mode To return to Normal modeTadjust Voltage Input Scaling Matching Transducers to the OM-550Matching a Voltage Transducer R1 = 2 R2 = V-2R1 = 2 Matching a Current Transducer= 2.0000 VDC = R1 Data Scaling mX + b calculation Matching and Scaling a Voltage Transducer VDC Matching and Scaling a Current Transducer ExampleU38u Unit Labels Operation Programmed InformationLog Interval Time Temperature Units Enter a Tadjust value, or press OK to finish programming U44u ∙ Performing a Manual Reset Appendix a Calibration ∙ Manual ResetManual Reset programs the OM-550 as follows ∙ Calibration Procedure Setup∙ Voltage Adjustment Procedure ∙ Thermocouple Adjustment Procedure∙ Exiting CAL Mode To return to normal operationAccuracy Appendix B SpecificationsVoltage Measurement Inputs Printer Paper LifeDigital Interface RS-232 ConversionPOWER/CURRENT Requirements Battery LifePhysical Dimensions ConnectorsOM-550 DOS Software Table of Contents How to Use This Manual IntroductionFonts Used in this Manual CPU, RAM, Hardware PrinterSoftware Installation ∙ Hard Drive InstallationStarting the Program To start the programMaster Menu Reading Data from the OM-550 Load Existing LOG Files To load a LOG fileModify Software Configuration U6u List Data on Monitor To list dataPrint Data on Printer Save Text FileTo print data To save data as textEdit Plot Labels To edit a plot labelHOT Plot Status BAR Magnify Tool To Magnify a portion of the Data GraphMagnify MAP Magnified Area Axis Labels Channel Data To select a channel to graphTo link plot lines Channels 4 & 5 After Linking Data Graph ∙ X-Cursor Data Table ∙ Data Plots∙ X-Data Cursors Help Menu To activate the Help menuTo quit List Existing LOG Files on PrinterTo list log files Appendix a KEY Functions