For analog input, there are 2 type of input method : Single-end input, Differential input
In general, single-end input is used, but differential input is suitable in the environment where the potential difference between signal source and ground and noise components can not be ignored. When using differential input, the number of channels than can be used is half of that when single-end input is used.
How to set analog input method differs depending on devices.
1.Set by JUMPER on devices
2.Set by software
Please refer to [Specifications based on devices] in function AioSetAiInputMethod for setting the input method of your device.
Ret = AioSetAiInputMethod ( Id , AiInputMethod )
Set the input method in AiInputMethod. AiInputMethod = 0 means single-end input. AiInputMethod = 1 means differential input.