1775 IMU Technical Manual
20
Master Sync (External Data Request)
Master Sync (External Data Request)
The 1775 IMU can accept an optional user-supplied RS-422 differential
master sync input signal on pin 7 (MSync (-)) and pin 11 (MSync (+)).
The IMU’s output will be triggered on the rising edge of this master
sync signal. The 1775 IMU master sync signal input supports both
isosynchronous and non-isosynchronous signaling methods of transmission
synchronization. For more information, refer to “Appendix C: Electrical
Signaling ICD” on page 31.
Figure 19: Master Sync
Figure 20: MSync Timing Parameters
To synchronize the IMU’s output with an external signal on pin 7 and
pin 11, enter the “=MSYNC,ext” command in Configuration mode.
Upon initiating the “=MSYNC,ext” command, the IMU automatically
clears any user-selected output filter and switches to the Uniform
Averager setting. This allows you to use the MSync signal as an
external data request for data, rather than using internally timed data
output. However, you may override this behavior by choosing any
output filter using the appropriate Output Filter commands provided
in Figure 14 on page 14. Be sure to enter the Output Filter commands
AFTER you have entered the “=MSYNC,ext” command.
NOTE: Consecutive rising edges of the MSync signal must be between
0.2-2000 ms apart. Pulsing MSync faster than 0.2 ms may result in
inaccurate or corrupt data output. If the IMU does not detect a rising edge
within 2000 ms, it will output data upon reaching 2000 ms.
Parameter Description Value
T1 MSync high 30 s
T2 MSync low 30 s
T3 Period between rising edges 0.2-2000 ms
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