AioSetAoChannels

Function

Sets the number of channels for the analog output conversion.

Format

Ret = AioSetAoChannels ( Id , AoChannels )

Parameters

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

AoChannels [ 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.
13060	The value of AoChannels is outside the designated range of the function Specify the number of analog output channels in range: 1 <= AoChannels <= 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 output 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.
23060	It is converted on the maximum channel because it exceeds the number of maximum channels of the device

Initial value

One channel is used for all devices

Remarks

If a device has the synchronous output function, it outputs the set channels at the same time. If the device have no the synchronous output function, it transparently (one after another output) outputs to the channel in the order of channel 0, 1, 2 and so on.

This function cannot be used on devices without the analog output function.
If the device is in operation, the function cannot be performed.

Example

2 channels are used for the analog output.

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