LabJack U12 - 4.32 - SHTComm

Declaration:
long SHTComm ( long *idnum,
long softComm,
long waitMeas,
long serialReset,
long dataRate,
long numWrite,
long numRead,
unsigned char *datatx,
unsigned char *datarx)
Parameter Description:
Returns: LabJack errorcodes or 0 for no error.
Inputs:
*idnum – Local ID, serial number, or -1 for first found.
softComm – If >0, forces software based communication. Otherwise software communication is only used if the LabJack
U12 firmware version is less than V1.1.
waitMeas – If >0, this is a T or RH measurement request.
serialReset – If >0, a serial reset is issued before sending and receiving bytes.
dataRate – 0=no extra delay (default), 1=medium delay, 2=max delay.
numWrite – Number of bytes to write (0-4).
numRead – Number of bytes to read (0-4).
*datatx – Array of 0-4 bytes to send. Make sure you pass at least numWrite number of bytes.
Outputs:
*idnum – Returns the local ID or –1 if no LabJack is found.
*datarx – Returns 0-4 read bytes as determined by numRead.
ActiveX Function Differences:
Transmit and receive data arrays are replaced with 4 individual parameters which each pass 1 transmit byte and return 1 read
byte.
Declaration (ActiveX):
long SHTCommX ( long FAR* idnum,
long softComm,
long waitMeas,
long serialReset,
long dataRate,
long numWrite,
long numRead,
long FAR* data0,
long FAR* data1,
long FAR* data2,
long FAR* data3 )
4.33 - SHTCRC
Checks the CRC on an SHT1X communication. Last byte of datarx is the CRC. Returns 0 if CRC is good, or
SHT1X_CRC_ERROR_LJ if CRC is bad.
Declaration:
long SHTCRC ( long statusReg,
long numWrite,
long numRead,
unsigned char *datatx,
unsigned char *datarx)
Parameter Description:
Returns: LabJack errorcodes or 0 for no error.
Inputs:
statusReg – Current value of the SHT1X status register.
numWrite – Number of bytes that were written (0-4).
numRead – Number of bytes that were read (1-4).
*datatx – Array of 0-4 bytes that were sent.
*datarx – Array of 1-4 bytes that were read.
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