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Matlab DLL access examples |
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Matlab entries Here's the starting point for Matlab developers for interfacing Lawson Labs, Inc. data acquisition systems Model 201 M201_SP_64bit.dll and M201_SP_64bit.h Must be in path. The easiest may be to have in your user/Documents/MATLAB folder and then use addpath to add it to your path. ============================== Load the DLL and set the port: ============================== 1.) >>loadlibrary('M201_SP_64bit', 'M201_SP_64bit') note: the following is 0 based. If your windows COM port is 5, make this 4 2.) >>result=calllib('M201_SP_64bit', 'EX_SetCOMport', 4) =========================== To get a single conversion: =========================== note: set main chan 6 (zero based) and sub-chan (only valid if multiplexer used) to 0 1.) >>result=calllib('M201_SP_64bit', 'EX_SetPolledModeChan', 6, 0) note: create a variable of type double 3.) >>volts = 0 note: make it a pointer that can be passed in function call 4.) >>volts_pntr=libpointer('doublePtr', volts) 5.) >>result=calllib('M201_SP_64bit', 'EX_GetOneConversion', volts_pntr) note: read the data from the variable pointer 6.) >>get(volts_pntr) ===================================== To get scan data for a single channel: ===================================== 1.) >>result=calllib('M201_SP_64bit', 'EX_SetScanType', 0) note: the following code is hex 60 (see it as main chan 6, sub chan 0) 2.) >>result=calllib('M201_SP_64bit', 'EX_SetSingleChanScanChanCode', 96) 3.) >>result=calllib('M201_SP_64bit', 'EX_Run') wait for a while as data is written to log file (ScanLog_xxx.txt) in same folder as DLL 4.) >>result=calllib('M201_SP_64bit', 'EX_Stop') results of scan will be in ScanLog_xxx.txt in same folder as DLL. The "xxx" will be a numeric value of the instance of the scan - for example the name for the first scan would be ScanLog_0.txt, the second would be ScanLog_1.txt when finished, call 5.) >>unloadlibrary('M201_SP_64bit') Get the 64-bit DLL and header file. click any image to see larger view
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