HG4930 Installation and Interface Manual
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aerospace.honeywell.com/HG4930
10
Normal Operation Mode Description
The serial data interface is operational within 300 milliseconds after the last applied power form is
within the specified tolerances and the reset line is inactive.
The IMU transmits a fixed pattern 0x5555 (Hex) in place of Control sensor data and 0x55555555
(Hex) in place of Inertial sensor data until the completion of Power Up BIT.
The IMU completes Power Up BIT and report the results within 400 milliseconds after power is
within specified tolerances and IMU Reset is inactive.
Figure 3. Power Up Sequence
Supervisor Reset or
External (IMU) Reset
Released
Power
Applied
<= 40ms
Serial Data
No Data
Fixed Data Pattern
Normal
Serial Data
< 260 ms
<= 260 ms
<= 400 ms
<= 440 ms
Time
