AioSetAiStartLevel

Function

Sets the level when the conversion start condition is level comparison.
This settings is necessary when the conversion start condition that is set by AioSetAiStartTrigger function is the level comparison.
This function doesn't need to be executed when the conversion start condition is not level comparison.

It can be set only 1ch for each device. The latest setting is available when you set it several times.

Format

Ret = AioSetAiStartLevel ( Id , AiChannel , AiStartLevel , AiDirection )

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 that performs the level comparison.

AiStartLevel [ C, C++ : long ] [ Python : ctypes.c_long ]
Sets the data that performs the level comparison from the following range.
The available value differs by the device.

Resolution of device is 12 bit	0 to 4095
Resolution of device is 16 bit	0 to 65535

AiDirection [ C, C++ : short ] [ Python : ctypes.c_short ]
Sets the direction of the level comparison from the following range.

0	Both edges
1	Rising edge
2	Falling edge

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.
11180	The value of AiChannel is outside the designated range of the function Specify the channel setting in range: 0 <= AiChannel <= Max channel.
11181	The value of AiDirection is outside the designated range of the function Set 0(both sides), 1(rising) or 2(falling) to AiDirection.
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.
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.
21180	The value of AiChannel is outside the designated range of the device being used
21181	Data to establish in the 12 bits device are within the range of 0 to 4095
21182	Data to establish in the 16 bits device are within the range of 0 to 65535
21184	The value of AiDirection is outside the designated range of the device being used

Initial value

In all devices, AiChannel = 0, AiDirection = 0

Resolution of device is 12 bit	AiStartLevel = 800H
Resolution of device is 16 bit	AiStartLevel = 8000H

Remarks

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

Example

Sets level comparison start for channel 0.
Level data is 800H, Level direction is Both edges.

C, C++	long Ret; Ret = AioSetAiStartLevel ( Id , 0 , 0x800 , 0 );
Python	Ret = ctypes.c_long() Ret.value = caio.AioSetAiStartLevel ( Id , 0 , 0x800 , 0 )