AioSingleAiEx

Function

Converts the specified channel one time, the conversion data are returned in voltage/current. This function supports multi-process.

Format

Ret = AioSingleAiEx ( Id , AiChannel , AiData )

Parameters

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

AiChannel [ C, C++ : short ] [ Python : ctypes.c_short ]
Specifies the channel to be converted.

AiData [ C, C++ : float * ] [ Python : ctypes.POINTER(ctypes.c_float) ]
Specifies the address of the variable that stores the converted data. The converted data are stored in voltage or current value.

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.
11840	The value of AiChannel is outside the designated range of the function Specify the channel setting in range: 0 <= AiChannel <= Max channel.
11841	Pointer to AiData is NULL Specify the address of variable to parameter.
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.
21840	The value of AiChannel is outside the designated range of the device being used
21843	The channel which isn't being used for the conversion is specified

Remarks

Before this function is executed, you must set the input range by using AioSetAiRange or AioSetAiRangeAll function.
This function cannot be used on devices without the analog input function.
If the device is in operation, the function cannot be performed.

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

Example

Converts Channel 0 one time.

C, C++	long Ret; float AiData; Ret = AioSingleAiEx ( Id , 0 , &AiData );
Python	Ret = ctypes.c_long() AiData = ctypes.c_float() Ret.value = caio.AioSingleAiEx ( Id , 0 , ctypes.byref(AiData) )