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There are two time stamps in the device that can be read out via telegrams (see operating instruction chapter telegram listing on sick.com):
Time since startup
This timer starts running at the power up of the device, starting with 0; The actual value is put into the data telegram stream always when the mirror is at the zero index ( -90° TiMxxx) Time is in µs and can be used as a relative time to the scan before. It is a temporary operation time counter. The time stamp is taken depending on the zero-index of the code plate, that means it depends on the scan frequency of the scanner, so there is no possiblity to have an influence to the tolerance (±300µs)
Time of transmission
This timer starts running at the power up of the device, starting with 0; The actual value is put into the data telegram when the complete scan data is transmitted to the buffer for data output. After that the data transmission to the host is started. Time is in µs and can be used as a relative time to the scan before. It is a timer that shows, that the actual scan is finished (LMS5xx: -5..185°; LMS1xx: -45..225°), the scan telegram is completed and the data is ready to be picked up from the internal data buffer (ready to be sent by the interface).
Index signal
The index signal is active from 90° to 97°, that means with a frequency of 15Hz (= Scan frequency), the device ready output (output 4) will be set to 0V for 1,5ms (duration of the 8° from 90°-97°).
It is made to have the possibility to synchronize scans by time. The index signal can be switched off via SopasET:
Keywords: timestamp, time, clock, TiM, 2D LiDAR, time,