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Issue
99, October 1998
Networking
with DeviceNet—Part
2: A Weather Station Application
by
Jim Brady
Start
• Can
Chips
• Chip
Setup •
Real Time
• Message
Flow
• Connections
• Timers
• Analog
Input Point
• Identity
Object
• Fragmented
Messages
• Getting
Physical
• Applying
DeviceNET
• Software,Sources
IDENTITY
OBJECT
Every
device must be able to give its name, rank, and serial
number. The Identity object holds this information. It
also keeps track of device state and does device resets.
There
are two types of resets. Type zero simulates an off/on
power cycle. To do this, I send a response back to the
master and suspend writes to my watchdog timer.
A
type-one reset changes settable configuration parameters
back to their factory default values and does a type-zero
reset. The weather station has no configurable settings,
so both resets are identical.
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