Sets the transfer mode of the analog input
conversion data.
Format
Ret = AioSetAiTransferMode
( Id , AiTransferMode )
Parameters
Id
[ VB.NET : Short ] [ C, C++ : short ] [ C# : short ] [ Python : ctypes.c_short
]
Specifies the ID retrieved from AioInit function.
AiTransferMode
[ VB.NET : Short ] [ C, C++ : short ] [ 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
[ VB.NET : Integer ] [ C, C++ : long ] [ C# : int ] [ 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 allocate 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)
Notes :
An exception error may occur if you release the registered user
buffer at any timing.
This is because the driver uses the registered user buffer.
Execute one of the following function processing before releasing
the registered user buffer.
- Execute AioExit(). Stop the device and release all the
memory and threads used by the driver.
- Execute AioResetDevice(). Initialize. The operation of
the device has stopped.
- Re-specify the user buffer mode with AioSetAiTransferMode(),
and specify the newly allocated application memory as a user buffer
with AioSetAiTransferData().
This function cannot be used on devices without
the analog input function.
If the device is in operation, the function cannot be performed.
