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12.0
PERFORMANCE
12.1 SAMPLING RATES
The Observer-i samples the input signal from Microphone in 10 millisecond intervals.
12.2 POWER-UP
On power up, the Observer-i executes a self-test procedure, which requires approximately 30 seconds.
During this time, the Analog Output is set to1.25 mA or 3.5 mA depending on the setting. After the self-
test is satisfactorily completed, the unit sets the Primary Variable to a value representing the mode of
the instrument.
12.3 DEVICE RESET
The Observer-i cannot be reset by any command. The unit only resets when power is cycled.
12.4 SELF-TEST
The Observer-i goes through a self-test upon power cycle. Should any of the tests fail, the unit
immediately reports a fault condition.
12.5 COMMAND RESPONSE DELAY
The Observer-i responds as follows:
12.6 BUSY AND DELAYED-RESPONSE
The Observer-i does not use delayed-response times.
12.7 LONG MESSAGES
The largest data field used by the Observer-i is in response to Command 20 & 22 (Read/Write Long
Tag): 34 bytes including the two status bytes.
12.8 NON-VOLATILE MEMORY (NVM)
The Observer-i uses NVM to hold the device's configuration parameters. New data is written to this
memory immediately on execution of a write command.
Response Type
Minimum
Typical
Maximum
Table 11: Command Response Times
32
OBSERVER-i HART
Response Time
20ms
50ms
100ms
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