AioGetAiSamplingDataEx

Function

Reads the sampling data of specified times from the device memory (software memory). The converted data are stored in Voltage or Current.
This function can only be used when the transfer mode of the conversion data that is set by AioSetAiTransferMode is Device buffer mode.
It cannot be used when the transfer mode of the conversion data is User buffer mode.

Format

Ret = AioGetAiSamplingDataEx ( Id , AiSamplingTimes , AiData )

Parameters

Id [ C, C++ : short ] [ Python : ctypes.c_short ]
Specifies the Device ID retrieved from AioInit function.

AiSamplingTimes [ C, C++ : long * ] [ Python : ctypes.POINTER(ctypes.c_long) ]
Specifies the address of variable which has stored the sampling times of acquiring data.
After this function is executed, return the actual number of samplings which has been read.

AiData [ C, C++ : float * ] [ Python : ctypes.POINTER(ctypes.c_float) ]
Specifies the address of array which stores the converted data. The converted data are stored in Voltage or Current.

Return value

Ret [ C, C++ : long ] [ Python : ctypes.c_long ]

Return values	Content
0	Normality completion
7	Execute AioResetDevice function because the device has recovered from standby mode
10001	Invalid Id was specified Use the Id retrieved from AioInit to specify the Id in this function.
10002	AIO driver can't be called At first, perform AioInit function.
11880	Pointer to AiSamplingTimes is NULL Specify the address of variable to parameter.
11881	Pointer to AiData is NULL Specify the address of variable to parameter.
11882	The value of AiSamplingTimes is outside the designated range of the function
20001	This function can't be used by this device
20003	Can not use because another process is using the device When another process is using the device, all functions except for those that support multi-process can not be performed.
21880	The value of AiChannels is outside the designated range of the device being used
21881	It tried to acquire data beyond the converted number AiSamplingTimes is changed to the maximum value
21885	FIFO is empty
21886	It tried to acquire data beyond the memory size. AiSamplingTimes is changed to the maximum value

Remarks

In AioStartAi, the used data are stored by each channel.

The usage differs by the memory type.

In FIFO memory:
Usually the old data is read in.
The data that has ever been read cannot be reread.
It can be used if the device is in operation.

In RING memory:
Retrieves the data of the specified sampling number from the latest data.
The same data can be repeated retrieved.
It can't be used if the device is in operation.

When you use this function and "simple functions", please refer "How to use simple functions and continuous functions at the same time" topics.

This function cannot be used on devices without the analog input function.

Example

Reads the sampling data of 1000 times.

C, C++	long Ret; long AiSamplingTimes; float AiData[1000]; AiSamplingTimes = 1000; Ret = AioGetAiSamplingDataEx ( Id , &AiSamplingTimes , &AiData[0] );
Python	Ret = ctypes.c_long() AiSamplingTimes = ctypes.c_long() AiDataType = ctypes.c_float * 1000 AiData = AiDataType() AiSamplingTimes.value = 1000 Ret.value = caio.AioGetAiSamplingDataEx ( Id , ctypes.byref(AiSamplingTimes) , AiData )