AIStreamStart/Read/Clear. Following is a brief description of each function. For more details
on each function see the LabJack U12 User’s Guide.
• EAnalogIn: Reads the voltage from one analog input.
• EAnalogOut: Sets the voltage on both analog outputs.
• ECount: Reads and resets the counter.
• EDigitalIn: Reads the state of one digital input.
• EDigitalOut: Sets the state of one digital output.
• AISample: Reads the voltages from 1,2, or 4 analog inputs. Also controls/reads the 4 IO ports.
• AIBurst: Reads a specified number of scans (up to 4096) at a specified scan rate (up to 8192
Hz) from 1,2, or 4 analog inputs. First, data is acquired and stored in the LabJack’s 4096 sample
RAM buffer. Then, the data is transferred to the PC.
• AIStreamStart: Starts a hardware timed continuous acquisition where data is sampled and
stored in the LabJack RAM buffer, and can be simultaneously transferred out of the RAM buffer
to the PC application. A call to this function should be followed by periodic calls to
AIStreamRead, and eventually a call to AIStreamClear.
• AIStreamRead: Waits for a specified number of scans to be available and reads them.
AIStreamStart should be called before this function and AIStreamClear should be called when
finished with the stream.
• AIStreamClear: This function stops the continuous acquisition. It should be called once when
finished with the stream.
• AOUpdate: Sets the voltages of the analog outputs. Also controls/reads all 20 digital I/O and the
counter.
• AsynchConfig: Configures the LabJack U12 D lines for asynchronous communication.
• Asynch: Writes then read half-duplex asynchronous data on 1 of two pairs of D lines. Basically
RS232 communication.
• BitsToVolts: Converts a 12-bit (0-4095) binary value into a LabJack voltage.
Volts=((2*Bits*Vmax/4096)-Vmax)/Gain where Vmax=10 for SE, 20 for Diff.
• VoltsToBits: Converts a voltage to it's 12-bit (0-4095) binary representation.
Bits=(4096*((Volts*Gain)+Vmax))/(2*Vmax)
• Counter: Controls and reads the counter. The counter is disabled if the watchdog timer is
enabled.
• DigitalIO: Reads and writes to all 20 digital I/O.
• GetDriverVersion: Returns the version number of ljackuw.dll.
• GetErrorString: Converts a LabJack errorcode, returned by another function, into a string
describing the error.
• GetFirmwareVersion: Retrieves the firmware version from the LabJack.
• GetWinVersion: Uses a Windows API function to get the OS version.
• ListAll: Searches the USB for all LabJacks, and returns the serial number and local ID for each.
• LocalID: Changes the local ID of a specified LabJack. Changes will not take effect until the
LabJack is re-enumerated or reset, either manually by disconnecting and reconnecting the USB
cable or by calling ReEnum or Reset.
• NoThread: Disables thread creation. Use with TestPoint on Windows 98/ME.
• PulseOut: Creates pulses on any/all of D0-D7.
• PulseOutStart: Starts a pulse output similar to PulseOut, but does not wait for it to finish.
• PulseOutFinish: Waits for the finish of a pulse output started with PulseOutStart.
• PulseOutCalc: Used to calculate cycle times for the pulse output functions.
• ReEnum: Causes the LabJack to electrically detach from and re-attach to the USB so it will re-
enumerate. The local ID and calibration constants are updated at this time.
• Reset or ResetLJ: Causes the LabJack to reset after about 2 seconds. After resetting the
LabJack will re-enumerate.
• SHT1X: Retrieves temperature and/or humidity readings from an SHT1X sensor.
• SHTComm: Generic low-level function to send and receive up to 4 bytes to/from an SHT1X
sensor.
• SHTCRC: Checks the CRC on an SHT1X communication.
• Synch: Performs SPI communication with a slave device.
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