Sets the transfer mode of the analog input
conversion data.
Format
Ret = AioSetAiTransferMode
( Id , AiTransferMode )
Parameters
Id
[ C, C++ : short ] [ Python : ctypes.c_short ]
Specifies the Device ID retrieved from AioInit function.
AiTransferMode
[ C, C++ : short ] [ Python : ctypes.c_short ]
Specifies the transfer mode from the following range.
0
Device buffer mode
1
User buffer mode
For the same device, if you want to use the
high-functional analog input and high-functional analog output at the
same time, it's necessary to unify the transfer mode.
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.
11960
The
value of AiTransferMode is outside the designated range of the
function
20001
This
function can't be used by this device
20002
Can
not use while by another device works
To use this function, analog input operation must be stopped.
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.
21960
The
value of AiTransferMode is outside the designated range of the
device being used
Initial value
In all devices, AiTransferMode = 0
Remarks
There are two types of transfer mode for
analog input conversion. The one is Device buffer mode, the other is User
buffer mode.
Device
buffer mode
After the conversion is started, the conversion data are stored
in device buffer (memory carried with the device or memory in
the driver).
Device buffer can be used as FIFO memory or RING memory. (AioSetAiMemoryType)
The Application can acquire the conversion data from the device
buffer by executing the function as needed. (AioGetAiSamplingData)
Device buffer mode can be used easier than User buffer mode,
because the conversion data are processed in the number of samplings
and the function that directly acquires the conversion data in
Voltage is supplied.
And, we usually recommend you use Device buffer mode, because
we has supplied the functionality for the most use.
User
buffer mode
Before the conversion is started, you need ensure and register
the application memory that stores the conversion data. (AioSetAiTransferData)
After the conversion is started, the conversion data are directly
stored to the application memory via the driver.
You can select the user buffer whether the user buffer is "Overwrite
the memory" or the user buffer is "Not overwrite the
memory". (AioSetAiMemoryType)
This function cannot be used on devices without
the analog input function.
If the device is in operation, the function cannot be performed.
