Innovate Motorsports OT-1 - Manual (Page 15)

- 15 -
Like the Saturn, it is connected using 500K bit CAN, but we can begin to see some ‘steppiness’ in
the RPM channel with only 8 channels being collected. In addition, some values, like the
Calculated Load are courser still. Presumably because the ECU itself is only calculating them a
few times per second.
With this in mind, it is probably best to assign channels only a few at a time and then select
“Program”. The ECU will disconnect, reconnect with the new choices, and then the overall
sample rate of the current settings can be observed using the blinking vehicle light on the OT-1.
It is then up to you, the user, to decide what is an acceptable balance. You can have a ‘video’ of
a small number of channels, or a picture scrapbook – snapshots of engine values spaced out in
time, with a larger number of channels.
3.6 Set the Priority of OBD-II Inputs (Optional)
Next to each Input Selection on the Inputs page there is a small checkbox. These checkboxes
are labeled “Low Priority”:
Since it is often a battle getting an ECU to deliver data fast enough, it is reasonable to ask why
one would lower the priority of a channel? The simple answer is, some ECU values just do not
change very fast. So, reading those values less often means that values that do change quickly
can be read more often. To understand how this works let’s take a look at how the OT-1
normally reads values: