AioSetAiChannels

Function

Sets the number of channels for the analog input conversion.

Format

Ret = AioSetAiChannels ( Id , AiChannels )

Parameters

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

AiChannels [ C, C++ : short ] [ Python : ctypes.c_short ]
Specifies the number of channels for the conversion.

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.
11020	The value of AiChannels is outside the designated range of the function Specify the number of analog input channels in range: 1 <= AiChannels <= Max number of channels.
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.
21020	It was set up by the number of maximum channels because it exceeded the number of maximum channels of the device The setting is automatically changed to the maximum number of channels.

Initial value

1 channel is used for all devices.

Remarks

Only converts the number of channels which are set in this function.
The channel conversion sequence is 0, 1, 2, ...;
This function cannot be used on devices without the analog input function.
If the device is in operation, the function cannot be performed.

In the case of Z-Series device such as AI-1204Z-PE,
it is not affected by the settings of function AioSetAiChannel,
the specified number of consecutive channels from 0ch are target conversion channels.

According to the application, you can use function AioSetAiChannels or AioSetAiChannel.

Example

2 channels are used for the analog input.

C, C++	long Ret; Ret = AioSetAiChannels ( Id , 2 );
Python	Ret = ctypes.c_long() Ret.value = caio.AioSetAiChannels ( Id , 2 )