Innovate Motorsports OT-2 - Manual (Page 21)

can be read more often. To understand how this works let’s take a look at how the OT-2normally
reads values:
As we can see from the diagram on the right, values are read from the
ECU one after another, in a loop. Since takes the ECU has certain
amount of time to respond to each query, the longer the list of channels,
the longer it takes to complete the loop. Obviously, the longer to takes
to complete the loop, the larger the time gap between each read of an
individual value.
Now let’s look at how Low Priority Values fit into this.
Instead of being read once each time through the loop, only one
Low Priority value is read each time through the loop. So, if you
have three low priority values, it will take three passes of the
loop to read them all once.
With our racetrack shaped diagram fresh in mind, let’s look at Low Priority inputs in practice. In
this example the vehicle can provide four OT-2 channels that update at full MTS rates. Even four
channels are still very usable. For example, here is RPM, SPARKADV (ignition timing),
FUEL1_OL (Open Loop Status) and VSS (Vehicle Speed Sensor):
Read 1st
Value
Read 2nd
Value
Read 3rd
Value
Read last
Value
Repeat
Read 1st
Value
Read 2nd
Value
Read last
Value
Repeat
Read one Low
Priority Value
Low Priority
Value List