LLABS USB Class Member functions

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LLABS USB Class
Member Functions

MyLL_USB

USB interface class for
-- For Win98/ME/2k/XP --
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Special note: Function calls that are followed by "_SP" are designed for quick and simple (special) interface for a single device. Class member function calls of that type are designed to connect to the first device that is found and then apply all other functionality to that device. _SP style member functions provide a very simple way to develop when using a single device and none of our other USB type devices are connected.

Constructor / Destructor

MyLL_USB::MyLL_USB(); MyLL_USB();: Creates a MyLL_USB object. You must call one of the forms of the Init function below before doing anything else with the object.

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MyLL_USB::~MyLL_USB(); ~MyLL_USB();: Destroys the object, frees all memory, and does any cleanup required when the MyLL_USB object is destroyed.

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Initialization

init

MyLL_USB::Init_SP(); BOOLEAN Init_SP();

**Special Init - see notes below

This member function is designed for use as a quick way to get going if you have only one of our USB devices connected and able to use all of the default parameters:

: Device - First USB device that is found by function
Rate - 100Hz
Chan - 1

There are similar member functions that you can use once initialized that are just as simple to use and even make use of the default parameters that this function will initialize the device to. It is suggested that you use only function calls followed by "_SP" if you use this form of the initialization. Other non- "_SP" functions can be used if you first call member function GetDefDevID_SP() to get the device ID that was uncovered by this function, to use in the other functions.

Return value shown below indicates if the device initialized successfully.

Arguments
None
Return type:: 8-bit. 1 (TRUE) = success, 0 (FALSE) = failed
Use member function GetLastAnyError() (shown elsewhere int this documentation) to get error code if this functin returns FALSE.

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MyLL_USB::Init(); BOOLEAN Init(USHORT usDevID);

**Similar to previous version of this call except you enter device ID.

This form of the Init call will attept to initialize the device represented by by the usDevID argument.

Arguments
usDevID:: 16-bit USHORT data type representing the LL_USB device that you wish to intitialize.

Return value shown below indicates if the device initialized successfully.
Return type:: 8-bit. 1 (TRUE) = success, 0 (FALSE) = failed
Use member function GetLastAnyError() (shown elsewhere int this documentation) to get error code if this functin returns FALSE.

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MyLL_USB::Init(); BOOLEAN Init(USHORT usDevID, BYTE bChan, DOUBLE* pdblRate);

**Recommended if using only one device.

This member function will attempt to initialize the device represented by the usDevID variable. If the function succeeds, it will return TRUE. If it fails, it will return FALSE. If the call fails, you can call MyLL_USB::GetLastAnyError (documented below) to get the error code.

Arguments
usDevID:: 16-bit USHORT data type representing the LL_USB devices that you wish to intitialize.

Return value shown below indicates if the device initialized successfully.
bChan:: 8-bit BYTE data type representing the channel for the LL_USB device that you wish to initialize.
pdblRate:: Pointer to a 64-bit double data types representing the rate for the usDevID that you wish to intitialize. If the device is successfully initialized, the variable pointed to by pdblRate will contain the rate of the device. The requested rate is often slightly adjusted due to hardware restrictions, so be sure to check the adjusted rate if the call successfully intializes the device by returning TRUE.
pfInitSuccess: Points to an 8-bit variable which will be set to TRUE if the device passed to the constructor successfully initializes.
Return type:: 8-bit. 1 (TRUE) = success, 0 (FALSE) = failed
Use member function GetLastAnyError() (shown elsewhere int this documentation) to get error code if this functin returns FALSE.

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MyLL_USB::Init(); BOOLEAN Init(USHORT* pausDevID, BYTE* pabChan, DOUBLE* padblRate);

**Recommended (one of two) if using more than one device.

This form of the Init call will attept to initialize all of the devices pointed to by pausDevID. That pointer must point to an array of 32 16-bit variables. Set all members of that array to zero and then fill it with the IDs of the devices you want to initialize. Likewise, zero the array of 8-bit variable array pabChan and array of double type variables padblRate to zero and then place the appropriate channel and desired rate within those arrays.

The threaded version of this call is very similar. At the present time, since all features of the threaded version haven't yet been implemented, the two forms of this member function are almost identical.

Arguments
pausDevList:: Pointer to a 32-member array of 16-bit USHORT data types representing the LL_USB devices that you wish to intitialize. When the call returns, this array will contain only the devices that successfully initialized, and the pdblRate documented below will contain the corresponding adjusted rates.
pabChan:: Pointer to an 32-member array of 8-bit BYTE data types representing the channels for the LL_USB devices that you wish to initialize.
padblRate:: Pointer to a 32-member array of 64-bit double data types representing the rates for the LL_USB devices that you wish to intitialize. The offsets in the array of each rate should correspond with the offsets of the appropriate DeviceID in the pausDevList array described above. When the call returns the pausDevList array described above and this array will have only valid entries in them. The DLL will reorganize the arrays if any of the desired devices failed to initialize so that there are no "holes" in the arrays. The corresponding alignment of the two arrays will be maintained.
Return type:: 8-bit. 1 (TRUE) = success, 0 (FALSE) = failed
Use member function GetLastAnyError() (shown elsewhere int this documentation) to get error code if this functin returns FALSE.

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MyLL_USB::Init(); BOOLEAN Init(USHORT* pausDevID, BYTE* pabChan,

: DOUBLE* padblRate, BOOLEAN fThreaded);

**Recommended (one of two) if using more than one device.

This form of the Init function will attempt to initialize all of the devices pointed to by pausDevID. That pointer must point to an array of 32 16-bit variables. Set all members of that array to zero and then fill it with the IDs of the devices you want to initialize. Likewise, zero the array of 8-bit variable array pabChan and array of double type variables padblRate to zero and then place the appropriate channel and desired rate within those arrays.

This is a threaded version of the Init function. However since all features of this version of the Init member function haven't yet been implemented, the previous form and this one are almost identical.

Arguments
pausDevList:: Pointer to a 32-member array of 16-bit USHORT data types representing the LL_USB devices that you wish to intitialize. When the call returns, this array will contain only the devices that successfully initialized, and the pdblRate documented below will contain the corresponding adjusted rates.
pabChan:: Pointer to an 32-member array of 8-bit BYTE data types representing the channels for the LL_USB devices that you wish to initialize.
padblRate:: Same as MyLL_USB::Init function explanation above.
fThreaded:: 8-bit BOOLEAN type variable indicating if you'd like for the initialization process to by run within a thread. If set to true, the constructor will make use of a threaded version of the initialization process within the DLL.
Return type:: 8-bit. 1 (TRUE) = success, 0 (FALSE) = failed
Use member function GetLastAnyError() (shown elsewhere int this documentation) to get error code if this functin returns FALSE.

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get default ID found by Init_SP( )

MyLL_USB::GetDefDev_SP(); BOOLEAN GetDefDev_SP(USHORT* pusDevID);

This member function will return the device ID (if any) that it retrieved from the call it made to Init_SP( ) . Use this function only if you used the Init_SP() member function.

Arguments
pusDevID:: Pointer to a 16-bit USHORT data type representing the LL_USB device.
Return type:: 8-bit. 1 (TRUE) = success, 0 (FALSE) = failed
Use member function GetLastAnyError() (shown elsewhere int this documentation) to get error code if this functin returns FALSE.

Rate and calibration

rate change

MyLL_USB::ChangeCurDevRate(); BOOLEAN ChangeCurDevRate(USHORT usDevID, DOUBLE* padblRate);

This member function is used to change the rate of a device. If scanning, do not place the devices that are currently scanning in the list since an attempt will be made to close and reenumerate any device that is currently in the list including the ones that are scanning if they are in the list.

Arguments

pdblRate:: Pointer to a 64 bit data variable. This is the rate that the device will be set to. Due to certain limitations of the device, all rates aren't valid and may be adjusted slightly. For example, a requested rate of 1000Hz may be altered to 1000.7Hz. The value pointed to by pdblRate will be set to the actual rate that the device was set to.
Return type:: 8-bit. 1 (TRUE) = success, 0 (FALSE) = failed
Use member function GetLastAnyError() (shown elsewhere int this documentation) to get error code if this functin returns FALSE.

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MyLL_USB::ChangeCurDevRate_SP(); BOOLEAN ChangeCurDevRate_SP(DOUBLE* padblRate);

This member function is used to change the rate of a device. Since there is no Device ID passed with this function, it is intended for use when only one device has been initialized preferably by using the no-arg Init_SP( ) member function shown elsewhere within this documentation.

If scanning, you should first end the scan before calling this function.

Arguments

pdblRate:: Pointer to a 64 bit data variable. This is the rate that the device will be set to. Due to certain limitations of the device, all rates aren't valid and may be adjusted slightly. For example, a requested rate of 1000Hz may be altered to 1000.7Hz. The value pointed to by pdblRate will be set to the actual rate that the device was set to.
Return type:: 8-bit. 1 (TRUE) = success, 0 (FALSE) = failed
Use member function GetLastAnyError() (shown elsewhere int this documentation) to get error code if this functin returns FALSE.

calibrate

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MyLL_USB::Calibrate(); BOOLEAN Calibrate(USHORT usDevID);

This member function is used to calibrate a device. A full-scale and offset calibration is performed. If scanning, do not place the devices that are currently scanning in the list since the DLL will automatically attempt to close and reenumerate any device that is currently in the list including the ones that are scanning if they are in the list.

Arguments

usDevID:: 16-bit data variable representing the device that you wish to calibrate.
Return type:: 8-bit. 1 (TRUE) = success, 0 (FALSE) = failed
Use member function GetLastAnyError() (shown elsewhere int this documentation) to get error code if this functin returns FALSE.

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MyLL_USB::Calibrate_SP(); BOOLEAN Calibrate_SP();

This member function is used to calibrate a device. Since there is no Device ID passed with this function, it is intended for use when only one device has been initialized preferably by using the no-arg Init_SP( ) member function shown elsewhere within this documentation.

If scanning, scanning you should first end the scan before calling this function.

Arguments

Return type:: 8-bit. 1 (TRUE) = success, 0 (FALSE) = failed
Use member function GetLastAnyError() (shown elsewhere int this documentation) to get error code if this functin returns FALSE.

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Basic I/O

channel

MyLL_USB::SetCurChan(); BOOLEAN SetCurChan(USHORT usDevID, BYTE bChan);

This member function is used to change the active channel of a device. It can be used anytime once the device has been initialized.

Valid channels for a Model-301 are 0,1,6,7 and for a Model-302 are 0-7. During multi-channel scan mode (explained elsewhere in this document), the channel changes are ignored. Channel 7 is concidered the "offset" channel and channel 6 is concidered the "full-scale" channel.

Arguments

usDevID:: 16-bit data variable representing the device that you wish to send channel change to.
bChan:: 8-bit data type representing the current channel the device listed above is to be set to.
pbReserved:: Pointer to an 8-bit data variable. This is currently reserved for future use.
Return type:: 8-bit. 1 (TRUE) = success, 0 (FALSE) = failed
Use member function GetLastAnyError() (shown elsewhere int this documentation) to get error code if this functin returns FALSE.

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MyLL_USB::SetCurChan_SP(); BOOLEAN SetCurChan_SP(BYTE bChan);

This member function is used to change the active channel of the device that was initialized using the Init_SP( ) member function described elsewhere within this documentation.

Valid channels for a Model-301 are 0,1,6,7 and for a Model-302 are 0-7. During multi-channel scan mode (explained elsewhere in this document), the channel changes are ignored. Channel 7 is concidered the "offset" channel and channel 6 is concidered the "full-scale" channel.

bCurChan:: 8-bit data type representing the current channel to set the device to.
Return type:: 8-bit. 1 (TRUE) = success, 0 (FALSE) = failed
Use member function GetLastAnyError() (shown elsewhere int this documentation) to get error code if this function returns FALSE.

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MyLL_USB::GetCurChan(); BOOLEAN GetCurChan(USHORT usDevID, BYTE* pbChan);

This member function is used to get the active channel of a device. It can be used anytime once the device has been initialized.

Valid channels for a Model-301 are 0,1,6,7 and for a Model-302 are 0-7. During multi-channel scan mode (explained elsewhere in this document), the channel changes are ignored. Channel 7 is concidered the "offset" channel and channel 6 is concidered the "full-scale" channel.

Arguments

usDevID:: 16-bit data variable representing the device that you wish to send channel change to.
bCurChan:: Pointer to an 8-bit data type to receive the value of the current channel for the device listed above.
Return type:: 8-bit. 1 (TRUE) = success, 0 (FALSE) = failed
Use member function GetLastAnyError() (shown elsewhere int this documentation) to get error code if this functin returns FALSE.

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MyLL_USB::GetCurChan_SP(); BOOLEAN GetCurChan_SP(BYTE* pbChan);

This member function is used to get the active channel of the device that was initialized using the Init_SP( ) member function described elswhere within this documentation.

Valid channels for a Model-301 are 0,1,6,7 and for a Model-302 are 0-7. During multi-channel scan mode (explained elsewhere in this document), the channel changes are ignored. Channel 7 is concidered the "offset" channel and channel 6 is concidered the "full-scale" channel.

Arguments

usDevID:: 16-bit data variable representing the device that you wish to send channel change to.
bCurChan:: Pointer to an 8-bit data type to receive the value of the current channel for the device listed above.
Return type:: 8-bit. 1 (TRUE) = success, 0 (FALSE) = failed
Use member function GetLastAnyError() (shown elsewhere int this documentation) to get error code if this functin returns FALSE.

analog output (Model 302 only)

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MyLL_USB::SendAnalogOut(); BOOLEAN SendAnalogOut(USHORT usDevID, BYTE bDAC, DOUBLE dblVoltage);

This member function is used to send an analog voltage to a Model 302.

Arguments

usDevID:: 16-bit data variable representing the device that you wish to send analog data to.
dblVoltage:: Voltage to send to Model-302
bDAC:: 8-bit data variable that represents the channel to send the analog voltage to
Return type:: 8-bit. 1 (TRUE) = success, 0 (FALSE) = failed
Use member function GetLastAnyError() (shown elsewhere int this documentation) to get error code if this functin returns FALSE.

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MyLL_USB::SendAnalogOut_SP(); BOOLEAN SendAnalogOut_SP(BYTE bDAC, DOUBLE dblVoltage);

This member function is used to send an analog voltage to a Model 302 device initialized using the Init_SP( ) member function described elsewhere within this documentation.

dblVoltage:: Voltage to send to Model-302
bDAC:: 8-bit data variable that represents the channel to send the analog voltage to
Return type:: 8-bit. 1 (TRUE) = success, 0 (FALSE) = failed
Use member function GetLastAnyError() (shown elsewhere int this documentation) to get error code if this functin returns FALSE.

digital output

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MyLL_USB::SendDigitalOutput(); BOOLEAN SendDigitalOutput(USHORT usDevID, BYTE bDigOutVal);

This function is used to send a digital output value to the device. It can be used anytime once the device has been initialized. Valid digital output values are 0-255.

Arguments

usDevID:: 16-bit data variable representing the device that you wish to send the digital output to.
bDigOutVal:: 8-bit digital output value that you want to send to device
Return type:: 8-bit. 1 (TRUE) = success, 0 (FALSE) = failed
Use member function GetLastAnyError() (shown elsewhere int this documentation) to get error code if this functin returns FALSE.

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MyLL_USB::SendDigitalOutput_SP(); BOOLEAN SendDigitalOutput_SP(BYTE bDigOutVal);

This function is used to send a digital output value to the device initialized by member function Init_SP( ) described elsewhere within this documentation. It can be used anytime once the device has been initialized. Valid digital output values are 0-255.

Arguments
bDigOutVal:: 8-bit digital output value that you want to send to device
Return type:: 8-bit. 1 (TRUE) = success, 0 (FALSE) = failed
Use member function GetLastAnyError() (shown elsewhere int this documentation) to get error code if this functin returns FALSE.

digital input

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MyLL_USB::GetDigitalInput(); BOOLEAN GetDigitalInput(USHORT usDevID, BYTE* bDigInVal);

This function is used to read the 8-bit digital input value from the device. It can be used anytime once the device has been initialized.

Arguments

usDevID:: 16-bit data variable representing the device that you wish to read the digital input value from
bDigInVal:: Pointer to an 8-bit data variable. The variable will contain the current digital input if the member function succeeds.
Return type:: 8-bit. 1 (TRUE) = success, 0 (FALSE) = failed
Use member function GetLastAnyError() (shown elsewhere int this documentation) to get error code if this functin returns FALSE.

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MyLL_USB::GetDigitalInput_SP(); BOOLEAN GetDigitalInput_SP(BYTE* bDigInVal);

This function is used to read the 8-bit digital input value from the device that was using the member function Init_SP( ) described elsewhere within this documentation.

Arguments
bDigInVal:: Pointer to an 8-bit data variable. The variable will contain the current digital input if the member function succeeds.
Return type:: 8-bit. 1 (TRUE) = success, 0 (FALSE) = failed
Use member function GetLastAnyError() (shown elsewhere int this documentation) to get error code if this functin returns FALSE.

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Polled data mode

get one voltage

MyLL_USB::GetOneVoltage(); BOOLEAN GetOneVoltage(USHORT usDevID, DOUBLE* pdblVoltage);

This call is used to read a single voltage from the device.

Arguments

usDevID:: 16-bit data variable representing the device that you wish to read the voltage data from.
pdblVoltage:: Pointer to a 64-bit type variable. If the functions succeeds the variable pointed to will contain the voltage. Voltage is in range +-5Volts.
Return type:: 8-bit. 1 (TRUE) = success, 0 (FALSE) = failed
Use member function GetLastAnyError() (shown elsewhere int this documentation) to get error code if this functin returns FALSE.

Special note:: If this call returns zero that could indicate a variety of error conditions such as the power or USB cable being disconnected. To find out the cause of the problem, we recommend using member function MyLL_USB::GetDevStatus() to get the current status of the device. That function also has the ability to recover from some errors that it incounters. For example if the device has lost power, but the power has been restored, the member function GetDevStatus() will attempt to regain control of the device.

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MyLL_USB::GetOneVoltage_SP(); BOOLEAN GetOneVoltage_SP(DOUBLE* pdblVoltage);

This call is used to read a single voltage from the device that was initialized using the Init_SP( ) function described elsewhere within this documentation.

Arguments
pdblVoltage:: Pointer to a 64-bit type variable. If the functions succeeds the variable pointed to will contain the voltage. Voltage is in range +-5Volts.
Return type:: 8-bit. 1 (TRUE) = success, 0 (FALSE) = failed
Use member function GetLastAnyError() (shown elsewhere int this documentation) to get error code if this functin returns FALSE.

Special note:: See special note in previous function call documentation just above this one.

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MyLL_USB::GetOneVoltage(); BOOLEAN GetOneVoltage(USHORT usDevID, DOUBLE* pdblVoltage, DOUBLE dblRange);

**SPECIAL NOTE: This is for modified hardware with voltage range other than +-5 volts.

This call is used to read a single voltage from the device, allowing the user to select the voltage range for certain modified hardware..

Arguments

usDevID:

16-bit data variable representing the device that you wish to read the voltage data from.

pdblVoltage:

Pointer to a 64-bit type variable. If the functions succeeds the variable pointed to will contain the voltage. Voltage is calculated like this:

Values used:
rawcount = 24-bit count read from device
maxcount = 16777215 = Maximum 24 bit count
halfcount = 8388608 = Half of maximum count (gives +-)

: Calculation:
(rawcount - halfcount) * ((dblRange / (DOUBLE)maxcount) * 2);

This function is useful for those who may have modified hardware with a different "range" setting than the normal +-5Volts.

dblRange:

64-bit data representing voltage range of your device. For example, +-5Volts = 10Volt range.

Return type:

8-bit. 1 (TRUE) = success, 0 (FALSE) = failed
Use member function GetLastAnyError() (shown elsewhere int this documentation) to get error code if this functin returns FALSE.

Special note: See special note attached to first listing of GetOneVotage() above.

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get one count

MyLL_USB::GetOneCount(); BOOLEAN GetOneCount(USHORT usDevID, UINT* puiRawCount);

This call is used to read a 24-bit count from the device.

Arguments

usDevID:

16-bit data variable representing the device that you wish to read the voltage data from.

puiRawCount:

Pointer to a 32-bit variable to contain the 24-bit data returned by the device. In this function we return the actual 24-bit data rather than convert it to a voltage. This may be usefule for those who are either interested in knowing the actual "count" or those who have hardware that has been specially modified for an input range other than +-5 volts.

An example of converting the 24-bit data returned above to a range of +-5 volts is shown below:

: INT iCntTemp = uiConvRawCount;
DOUBLE Voltage = (iCntTemp - 8388608) * 0.00000059604645

Return type:

8-bit. 1 (TRUE) = success, 0 (FALSE) = failed
Use member function GetLastAnyError() (shown elsewhere int this documentation) to get error code if this functin returns FALSE.

Special note: See special note attached to first listing of GetOneVotage() above.

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Scanning data mode

start scan

There are two suggested methods for starting a scan. When using only a single device, the first of the two is recommended

note: When passing "number of channels" to any of the scan start member functions please understand the procedure for setting the value correctly when using the "calibration" type scans. When using a cal-scan, channel-7 is always returned and must be included in the "number of channels" that you request. When using a Model-301, even though there are only 4 available channels, the 4th channel is known as "channel-7" or most commonly known as the "offset" channel. Likewise the 3rd channel is referred to as "channel-6" or most commonly known as the "full scale" channel. To further explain... if you are performing a 2-channel scan using a Model-301 device, you must set the channels requested to 3 since channel 7 will be returned along with the two channels. It is up to you to subtract the value of channel 7 from each of the other channels. Keeping that in mind, a 4-channel calibration type scan using a Model-301 device returns the exact same amount of data as a 3-channel scan since the 4th channel (chan7) is included in both situations.

MyLL_USB::StartScan(); BOOLEAN StartScan(USHORT usDevID);

This member function is used to place a device into scan mode. If this function returns success then the device will be in scan mode and you can begin reading the data from the device using the MyLL_USB class member functions explained elsewhere within this document.

A scan started using this function will always scan using a CMND_SINGLE_CHAN_SCAN type of scan and will scan the current channel.

Arguments

usDevID:: 16-bit data variable representing the device that you wish to start scanning.
Return type:: 8-bit. 1 (TRUE) = success, 0 (FALSE) = failed
Use member function GetLastAnyError() (shown elsewhere int this documentation) to get error code if this functin returns FALSE.

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MyLL_USB::StartScan_SP(); BOOLEAN StartScan_SP();

This member function is used to place the device that was initialized using the class member function Init_SP( ) (described elsewhere in this documentation) into scan mode. If this function returns success then the device will be in scan mode and you can begin reading the data from the device using the MyLL_USB class member functions explained elsewhere within this document.

A scan started using this function will always scan using a CMND_SINGLE_CHAN_SCAN type of scan and will scan the current channel.

Arguments
Return type:: 8-bit. 1 (TRUE) = success, 0 (FALSE) = failed
Use member function GetLastAnyError() (shown elsewhere int this documentation) to get error code if this functin returns FALSE.

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MyLL_USB::StartScan(); BOOLEAN StartScan(BYTE bNumDevices, USHORT* pausDevID,

: BYTE* pabScanType, BYTE* pabNumChans, BYTE* pabScanStarted);

This function is used to place one or more devices into scan mode. If this function returns success, inspect the members of the array pointed to by pabScanStarted to see the scan startup status of the various devices. The indexes in the array pointed to by pabScanStarted correspond to the devices in the array pointed to by pausDevID. You can begin reading the data from the devices that successfully started scanning by using the function calls explained elsewhere within this document.

Arguments

bNumDevices:

An 8-bit variable that indicates the number of devices in the list to start scanning.

pausDevID:

Pointer to a 32 member array of 16-bit variables representing the devices that you want to start scanning. Please set all non-valid members of the array to zero.

pabScanType:

Pointer to a 32 member array of 8-bit data types that indicate the type of scan.

CMND_SINGLE_CHAN_SCAN	1
CMND_MULTI_CHAN_SCAN	2
CMND_MULTI_CHAN_CAL_SCAN	3
CMND_SINGLE_CHAN_DIGIN_SCAN	4
CMND_MULTI_CHAN_DIGIN_SCAN	5
CMND_MULTI_CHAN_DIGIN_CAL_SCAN	6

pabNumChans:

Pointer to a 32 member array of 8-bit data types that indicates the number of channels you want to scan for each device in the device ID array. This value is ignored when in any of the single-channel scan modes. Valid values for Model-301 type devices is 1-4 and for Model-302 type devices 1-8.

pabScanStarted:

Pointer to a 32 member array of 8-bit data types. When the function returns, the value of each member will indicate the status of the starting of the scan for the correspoinding device ID. The values are:
0 = failed to start
1 = start success
2 = already scanning.

Return type:

8-bit. 1 (TRUE) = success, 0 (FALSE) = failed
Use member function GetLastAnyError() (shown elsewhere int this documentation) to get error code if this functin returns FALSE.

read scan data

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There are several methods for reading scan data depending on the type of scan you are doing and the number of devices. The first method shown below is recommended if you are scanning only a single device using a single channel and a non-digital input type scan. Please remember that a digital input is returned with each packet even when using non-digital input type scans. The difference is that with a digital input type of scan, the digital input is included with each channel data with every read from each channel which is used mostly for triggering of a particular channel using the digital input bit(s).

MyLL_USB::GetScanVoltage_SP(); BOOLEAN GetScanVoltage_SP( PSCAN_INFO_USB_PNTS_SINGLE pScanInfoPntsSingle, DOUBLE* padblVoltages);

* This function is recommended to read scan data from a single device that was initialized using the class member function Init_SP( ) described elsewhere within this documention. This is one of the easies ways to read the scan data for a single device since there is a minimum number of arguments to the call and the 24-bit raw data is converted +-5 volts before being returned to the caller.

Arguments

pScanInfoPntsSingle:: pointer to an array of structured data defined below:
padblVoltages:: Pointer to an array of 64-bit floating point data types to contain the voltages. The array must be the size indicated by the usNumPntsToRead member of the array pointed to by the pScanInfoPntsSingle argument described above.
Return type:: 8-bit. 1 (TRUE) = success, 0 (FALSE) = failed
Use member function GetLastAnyError() (shown elsewhere int this documentation) to get error code if this functin returns FALSE.

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MyLL_USB::GetScanVoltage(); BOOLEAN GetScanVoltage( PSCAN_INFO_USB_PNTS_SINGLE pScanInfoPntsSingle, DOUBLE* padblVoltages);

* This function is recommended to read scan data from a single device that you pass as member of structured describe below.

Arguments

pScanInfoPntsSingle:: same as GetScanVoltage_SP() except you set device ID in struct.
padblVoltages:: same as GetScanVoltage_SP() above.
Return type:: 8-bit. 1 (TRUE) = success, 0 (FALSE) = failed
Use member function GetLastAnyError() (shown elsewhere int this documentation) to get error code if this functin returns FALSE.

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MyLL_USB::GetScanData(); BOOLEAN GetScanData(PSCAN_INFO_USB paScanInfo, PSCAN_PACKET_USB paScanPacket);

* This function is recommended to read scan data from a single device using a digital input type scan. As with the previous member function shown above, it can be used with any type of scan and any arguments or return values that don't apply to the type of scan will be ignored. This member function is not recommended for single channel type scans due to the amount memory that will be waisted as a result of using the structured data.

Arguments

paScanInfo:: pointer to an array of structured data defined below:
paScanPacket: Pointer to an array of structured data defined below:
Return type:: 8-bit. 1 (TRUE) = success, 0 (FALSE) = failed
Use member function GetLastAnyError() (shown elsewhere int this documentation) to get error code if this functin returns FALSE.

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MyLL_USB::GetScanData(); BOOLEAN GetScanData(

: USHORT usDevID, USHORT usNumPntsToRead, USHORT* pusNumPntsRead,
UINT* pauiDataBuff, UINT* puiStatusFlags, UINT* puiPntsInBuff, BYTE* pbLastDigin);

* This function is recommended to read scan data from a single device using a non-digital input type of scan.

Arguments

usDevID:

16-bit data variable representing the device that you wish to read scan data from

usNumPntsToRead:

16-bit data type that indicates the number of points that you want to read. Be certain that your data buffer is large enough to hold all data by sizing it using the value of this variable or larger.

pusNumPntsRead:

Pointer to a 16-bit data type that will be set upon return indicating the number of points that were actually read.

pauiDataBuff:

Pointer to an array of 32-bit data types. This is the raw 24-bit data that represents the voltage count read by the device. An example of converting the 24-bit data returned above to a range of +-5 volts is shown below:

INT iCntTemp = uiConvRawCount; DOUBLE Voltage = (iCntTemp - 8388608) * 0.00000059604645

note: The 0.00000059604645 used above is maximum voltage range (10 volts) divided by maximum 24-bit count value 16777215 (0xFFFFFF). The 8388608 (0x800000) value used above sets the result to +-5 volts using the 10-volt range

puiStatusFlags:

Pointer to a 32-member array of 32-bit data types. Upon return from the function call each member will be set with the current scan status of the corresponding device in the DevID array. It's important to watch for a status of SCAN_HALTED. The possible values are indicated below. Please notice that the values represent various bits of the 32-bit value so they are easily "ANDed" to check individual status values.

SCAN_DATA_REQUEST_SUCCEEDED	0x2
SCAN_ENDING	0x4
SCAN_HALTED	0x8
SCAN_CHECKSUM_ERROR	0x10