LabJack U12 User Manual
Also see for U12: User guideQuick guideQuick start guide
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• *scanRate – Returns the actual scan rate, which due to clock resolution is notalways exactly the same as the desired scan rate.• *voltages – Pointer to a 4096 by 4 array where voltage readings are returned.Unused locations are filled with 9999.0.• *stateIOout – Pointer to a 4096 element array where IO states are returned.Unused locations are filled with 9999.0.• *overVoltage – If >0, an overvoltage has been detected on at least one sampleof one of the selected analog inputs.ActiveX Function Differences:The “channels” and “gains” arrays are replaced with “channelsPacked” and “gainsPacked”. TheOCX has a function “FourPack” (4.23) which will convert 4 elements to a packed value. Thepacked value is determined as: element[0] + (element[1] * 2^8) + (element[2] * 2^16) +(element[3] * 2^24).The parameters “demo”, “ledOn”, “disableCal”, “transferMode”, “updateIO”, and “stateIOin”, arereplaced by an “optionBits” parameter. Call the OCX function “BuildOptionBits” (4.22) todetermine this parameter.The “voltages” and “stateIOout” arrays are represented as strings. Floating point data isreturned as 13 characters per number (XXXX.XXXXXXXX) and integers are returned as 10characters per number (XXXXXXXXXX). Zeros are used for padding where necessary.Declaration (ActiveX):long AIBurstX ( long FAR* idnum,long numChannels,long channelsPacked,long gainsPacked,float FAR* scanRate,long triggerIO,long triggerState,long numScans,long timeout,BSTR FAR* voltages,BSTR FAR* stateIOout,long FAR* overVoltage,long optionBits)4.3 AIStreamStartStarts a hardware timed continuous acquisition where data is sampled and stored in theLabJack RAM buffer, and can be simultaneously transferred out of the RAM buffer to the PCapplication. A call to this function should be followed by periodic calls to AIStreamRead, andeventually a call to AIStreamClear.If the LED is enabled (ledOn>0), it will toggle every 40 samples during acquisition and turn onwhen the stream operation stops.Declaration:long __cdecl AIStreamStart ( long *idnum,long demo,long stateIOin,long updateIO,long ledOn, |
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