Advantech POC127, User Manual

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53 POC-127 User Manual
Chapter 7
O
ptional
Devices

I
2
C
I
2
C is a bi-directional two wire bus that was developed by Phillips for use in their tele-
visions in the 1980s. Today, I2C is used in all types of embedded systems.
The I
2
C API allows a developer to interface a Windows XP or CE PC to a down-
stream embedded system environment and transfer serial messages using the I
2
C
protocols, allowing multiple simultaneous device control.
Monitor

Watchdog
A watchdog timer (WDT) is a device or electronic card that performs a specific opera-
tion after a certain period of time if something goes wrong with an electronic system
and the system does not recover on its own.
A watchdog timer can be programmed to perform a warm boot (restarting the sys-
tem) after a certain number of seconds during which a program or computer fails to
respond following the most recent mouse click or keyboard action.

Hardware Monitor
The Hardware Monitor (HWM) API is a system health supervision API that inspects
certain condition indexes, such as fan speed, temperature and voltage.