AioSetCntFilter

Function

Sets the filter for the counter input signal.

Format

Ret = AioSetCntFilter ( Id , CntChannel , Signal , Value )

Parameters

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

CntChannel [ VB.NET : Short ] [ C, C++ : short ] [ C# : short ] [ Python : ctypes.c_short ]
Sets the channel of counter.
Only -1 can be set now, this setting is for all channels.

Signal [ VB.NET : Short ] [ C, C++ : short ] [ C# : short ] [ Python : ctypes.c_short ]
Specifies the input signal for setting filter.
Only -1 can be set now.

Input signal	Value
External UP clock (Reserved)	0
All signals above	-1

Value [ VB.NET : Single ] [ C, C++ : float ] [ C# : float ] [ Python : ctypes.c_float ]
Sets the filter time. The unit is usec.
0 means no filter.

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.
15120	The value of CntChannel is outside the designated range of the function
15121	The value of Signal is outside the designated range of the function
15122	The value of Value 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, counter 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.
25120	The value of CntChannel is outside the designated range of the device being used
25121	The value of Value is outside the designated range of the device being used
25123	The value of Signal is outside the designated range of the device being used

Initial value

For all signal lines, filter is disabled

Remarks

If the filter is set, the high frequency component (noise, chattering and so on) can be removed.

The larger the value of filter time setting is, the better the noise and chattering can be avoided. But the delay time of switching between ON and OFF will become longer.

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

Specifications based on devices

AIO-163202F-PE ADA16-32/2(PCI)F	The individual filter cannot be set for each channel. CntChannel = -1 is fixed. Setting is for all channels regardless of the channel setting. Usable Value is 0, 1, 128, 16000.
AI-1664UG-PE AIO-163202G-PE AIO-163202UG-PE AIO-123202G-PE AIO-123202UG-PE	The individual filter cannot be set for each channel. CntChannel = -1 is fixed. Setting is for all channels regardless of the channel setting. Usable Value is 0, 0.125, 0.25, 0.5, 1.0, 2.0, 4.0, 8.0, 16.0, 32.0, 64.0, 128.0, 256.0, 512.0, 1024.0, 2048.0, 4096.0, 8192.0, 16000.0. The digital input signal is sampled at each filter time, and when 4 consecutive High (or Low) are detected, it is notified to the input circuit. Therefore, the signal is delayed by 4 times the set filter time.
AIO-160802L-LPE ADA16-8/2(LPCI)L ADAI16-8/2(LPCI)L AIO-160802LI-PE	CntChannel = -1 is fixed. Usable Value is 0 or 1.
AI-1616L-LPE AD16-64(LPCI)LA AD16-16(LPCI)L ADI16-16(LPCI)L AI-1616LI-PE AI-1664LA-LPE	CntChannel = -1 is fixed. Usable Value is 0 or 1.
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	CntChannel = -1 is fixed. Usable Value is 0 or 1.
AIO-163202FX-USB	The individual filter cannot be set for each channel. CntChannel = -1 is fixed. Setting is for all channels regardless of the channel setting. Usable Value is 0, 1, 128, 16000.
AIO-121602LN-USB AIO-120802LN-USB	CntChannel = -1 is fixed. Usable Value is 0, 1, 128, 16000.
AI-1664LAX-USB	CntChannel = -1 is fixed. Usable Value is 0 or 1.
AO-1604LX-USB	CntChannel = -1 is fixed. Usable Value is 0 or 1.

Example

Sets 1usec to the filter for all signals.

VB.NET	Dim Ret As Integer Ret = AioSetCntFilter ( Id , -1 , -1 , 1.0 )
C, C++	long Ret; Ret = AioSetCntFilter ( Id , -1 , -1 , 1.0 );
C#	int Ret; Ret = aio.SetCntFilter ( Id , -1 , -1 , 1.0F );
Python	Ret = ctypes.c_long() Ret.value = caio.AioSetCntFilter ( Id , -1 , -1 , 1.0 )