User`s guide

Operation Theorem • 35
4.1 AD Conversion and Preloaded Trigger
4.1.1 ADC
The PCI-8136M provides 6 Differential ADC channels. Each channel
consists of two inputs. One is for (+) signal and the other is for (-) signal. The
input signal may be voltage ranged from –10 ~ +10V or current ranged
from –20mA ~ 20mA. The ADC resolution is 12-bit. The following figure
shows the A (voltage or current) to D (value read) converting table. The zero
voltage or current is at value 2000.
Related functions:
_8136_A_Initial(): please refer to section 5.2
_8136_A_Read_Value(), _8136_A_Read_Volt(): please refer to
section 5.7
4.1.2 Voltage Compare
The voltage compare function of PCI-8136 is very useful. It allows us er to set
a compare value by software function. When one ADC signal reaches the
pre-set value, an interrupt will be generated for corresponding channel.