Measurement Computing CB-7000 Utilities - Manual (Page 28)

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3.3 Module Watchdog
3.3.1 Introduction
The 7000 series modules are designed for industrial applications. They can b e used in an
electrically harsh environment. However, the module can go down if EMI or power supply noise
is too high.
The “$AA5” command is designed to detect the module hardware watchdog timeout. If a module
goes down, the module hardware watchdog circuit resets the module. The reset puts the output
state of module to its power-on value. The Power-On value may be different from the output-
value before module was reset. Therefore the user must send an output command again to return
to the original output state (or value) before module watchdog reset.
Figure 3-5. Module Watchdog Resets the Module
When the Module is Halted.