AioGetAiMaxChannels

Function

Retrieves the maximum number of channels for the analog input. This function supports multi-process.

Format

Ret = AioGetAiMaxChannels ( Id , AiMaxChannels )

Parameters

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

AiMaxChannels [ C, C++ : short * ] [ Python : ctypes.POINTER(ctypes.c_short) ]
Specifies the address of the variable that stores the maximum number of channels.

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.
11720	Pointer to AiMaxChannels is NULL Specify the address of variable to parameter.
20002	Can not use while by another device works To use this function, analog input operation must be stopped.

Remarks

The maximum number of channels differs by the device that you use.
And, it changes depending on the analog input method (Single-end input or Differential input) and whether or not the multiplexer is used.
If the device without the analog input functionality, AiMaxChannels = 0.
If the device is in operation, the function cannot be performed.

Specifications based on devices

AI-1204Z-PE	AiMaxChannels = 4 is fixed
AI-1664UG-PE	Initial value is AiMaxChannels = 64, it is automatically changed by the settings of analog input method.
AIO-163202G-PE AIO-163202UG-PE AIO-123202G-PE AIO-123202UG-PE AIO-163202F-PE ADA16-32/2(PCI)F	Initial value is AiMaxChannels = 32, it is automatically changed by the settings of analog input method.
AIO-160802L-LPE ADA16-8/2(LPCI)L ADAI16-8/2(LPCI)L AIO-160802LI-PE	AiMaxChannels = 8 is fixed
AD16-64(LPCI)LA AI-1664LA-LPE	Initial value is AiMaxChannels = 64, It is automatic changed by the settings of analog input method.
AI-1616L-LPE AD16-16(LPCI)L ADI16-16(LPCI)L AI-1616LI-PE	AiMaxChannels = 16 is fixed
AD12-16(PCI)EV AD12-16U(PCI)EV AD16-16(PCI)EV AD16-16U(PCI)EV AIO-121601E3-PE AIO-121601UE3-PE AIO-161601E3-PE AIO-161601UE3-PE AI-1216I2-PCI	It is automatic decided by the multiplexer or without multiplexer, and the JP settings of the analog input method.
AD12-64(PCI)	Initial value is AiMaxChannels = 64, It is automatic changed by the settings of analog input method
AD12-16(PCI)	Initial value is AiMaxChannels = 16, It is automatic changed by the settings of analog input method.
AI-1604CI2-PCI	AiMaxChannels = 4 is fixed
AI-1608AY-USB AIO-160802AY-USB AI-1608GY-USB AIO-160802GY-USB	AiMaxChannels = 8 is fixed
AIO-163202FX-USB	Initial value is AiMaxChannels = 32, it is automatically changed by the settings of analog input method.
AI-1664LAX-USB	Initial value is AiMaxChannels = 64, it is automatic changed by the settings of analog input method.
AIO-121602LN-USB	Initial value is AiMaxChannels = 16, it is automatic changed by the settings of analog input method.
AIO-120802LN-USB	Initial value is AiMaxChannels = 16, it is automatic changed by the settings of analog input method.
AI-1004LY-WQ AI-1004LY-WQ-EU AI-1004LY-WQ-US AI-1004LY-WQ-CN	AiMaxChannels = 4 is fixed
CPSN-AI-1208LI CPSN-AI-2408LI	Initial value is AiMaxChannels = 8, it is automatic changed by the settings of analog input method.
AI-1608VIN-USB AI-1608AIN-USB AI-1608VIN-ETH AI-1608AIN-ETH	AiMaxChannels = 8 is fixed
CPI-AI-1208LI	Initial value is AiMaxChannels = 8, it is automatic changed by the settings of analog input method.
AIO-16256256-DEMO	Initial value is AiMaxChannels = 256, it is automatic changed by the settings of analog input method.

Example

Retrieves the maximum number of channels for the analog input.

C, C++	long Ret; short AiMaxChannels; Ret = AioGetAiMaxChannels ( Id , &AiMaxChannels );
Python	Ret = ctypes.c_long() AiMaxChannels = ctypes.c_short() Ret.value = caio.AioGetAiMaxChannels ( Id , ctypes.byref(AiMaxChannels) )