High resolution event timer channel
This channel provides a method of outputting an event time with micro-second resolution referenced to GPS time, or 10 micro-second resolution referenced to run file sample time, or alternatively to output a regular timestamp with 10 micro-second resolution.
Event details = Data1
If data1 bit 5 = 0
This is a timestamp for an event, this type of message is currently only generated from the SPEEDBOX range of products.
If data 1 bit 6 = 0 then event time is given by
GPS micro-second time of week = (Data2 x 2^32 + Data3 x 2^24 + Data4 x 2^16 + Data5 x 2^8 + Data6)
So in this case the time stamp is relative to the GPS time. This information is generally only used within Race Technology for validation and error checking.
If data 1 bit 6 = 1 then event time is given by
Run time in microseconds = 10 x (Data2 x 2^32 + Data3 x 2^24 + Data4 x 2^16 + Data5 x 2^8 + Data6)
(Run time is on a common standard with both standard and high-resolution timestamps)
This message is used by Race Technology software to accurately time events in relation to speed and distance etc.
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.
If data1 bit 5 = 1
This is a run file high frequency time stamp