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DataAndConfigurationMessages / 97HighResolutionEventTimerChannel

High resolution event timer channel

Channel Number97
Total Length8bytes
ChannelData1Data2Data3Data4Data5Data6Checksum

Event details = Data1
GPS micro-second time of week = (Data2 x 2^32 + Data3 x 2^24 + Data4 x 2^16 + Data5 x 2^8 + Data6)

For Data1, bits 0 - 2 (the 3 least significant bits) are used to determine which trigger on a logger the signal has originated from. Trigger numbers are 1-based on the logger fascias, but zero-based in this message, so:
Trigger number = (Data1 & 0x07) + 1
Bit 7, the msb, is used to indicate the polarity of the originating event.
if bit7 = 0 (i.e. Data1 & 0x80 == 0) then the event was triggered by a falling edge.
if bit7 = 1 (i.e. Data1 & 0x80 == 1) then the event was triggered by a rising edge.

This channel provides a method of outputting an event time with micro-second resolution referenced to GPS time.

Page last modified on January 27, 2009, at 09:19 AM