AioGetCntMaxChannels

Function

Retrieves the maximum number of the counter channels. This function supports multi-process.

Format

Ret = AioGetCntMaxChannels ( Id , CntMaxChannels )

Parameters

Id [ VB.NET : Short ] [ C, C++ : short ] [ C# : short ] [ Python : ctypes.c_short ]
Specifies the device ID retrieved from AioInit.

CntMaxChannels [ VB.NET : Short ] [ C, C++ : short * ] [ C# : out short ] [ Python : ctypes.POINTER(ctypes.c_short) ]
Specifies the address of the variable that stores the maximum number of channels.

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.
15260	Pointer to CntMaxChannels is NULL Specify the address of variable to parameter.

Remarks

The maximum number of channels is different according to device used.
CntMaxChannels becomes 0 for the device without counter functionality.
If the device is in operation, the function cannot be performed.

Specifications based on devices

AIO-163202G-PE AIO-163202UG-PE AIO-123202G-PE AIO-123202UG-PE AIO-163202F-PE ADA16-32/2(PCI)F	CntMaxChannels = 2, channel is shared with timer functionality.
AI-1664UG-PE	CntMaxChannels = 1, channel is shared with timer functionality.
AIO-160802L-LPE ADA16-8/2(LPCI)L ADAI16-8/2(LPCI)L AIO-160802LI-PE	CntMaxChannels = 1, channel is shared with timer functionality.
AI-1616L-LPE AD16-64(LPCI)LA AD16-16(LPCI)L ADI16-16(LPCI)L AI-1616LI-PE AI-1664LA-LPE	CntMaxChannels = 1, channel is shared with timer functionality.
AO-1604L-LPE DA16-16(LPCI)L DA16-8(LPCI)L DA16-4(LPCI)L DAI16-4(LPCI)L AO-1604LI-PE AO-1608L-LPE AO-1616L-LPE AO-1604LX-USB	CntMaxChannels = 1, channel is shared with timer functionality.
AIO-163202FX-USB	CntMaxChannels = 2
AI-1664LAX-USB	CntMaxChannels = 1, channel is shared with timer functionality.
AIO-121602LN-USB AIO-120802LN-USB	CntMaxChannels = 1

Example

Retrieves the maximum number of counter channels.

VB.NET	Dim Ret As Integer Dim CntMaxChannels As Short Ret = AioGetCntMaxChannels ( Id , CntMaxChannels )
C, C++	long Ret; short CntMaxChannels; Ret = AioGetCntMaxChannels ( Id , &CntMaxChannels );
C#	int Ret; short CntMaxChannels; Ret = aio.GetCntMaxChannels ( Id , out CntMaxChannels );
Python	Ret = ctypes.c_long() CntMaxChannels = ctypes.c_short() Ret.value = caio.AioGetCntMaxChannels ( Id , ctypes.byref(CntMaxChannels) )