1775 IMU Technical Manual
18
Time of Validity (TOV) Output
Time of Validity (TOV) Output
The 1775 IMU provides an optional RS-422 differential output on the
external connector (named TOV-OUT+/TOV-OUT-) to indicate the
time at which the data being output on the serial port can be
considered to be valid. TOV should not be used or considered valid
when operating the IMU in modes other than Normal Mode(e.g., in
Configuration mode). TOV signaling is based on the IMU's internal
clock and shown in Figure 16.
MSYNC is an optional 1775 IMU timing synchronization method used
for external control systems. An external (master synchronization)
differential signal input will trigger the IMU output at its rising edge.
The MSYNC digital signal supports asynchronous requests for data.
Use of the external MSYNC option can affect, or be affected by other
configuration settings. For more information, refer to “Appendix C:
Electrical Signaling ICD” on page 31.
Figure 17: TOV Output Timing Relative to Serial Port Activity
T2
T3
T4
TOV+ Output
Serial Port
Active
T1
T5
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