Haltech F9A - Manual (Page 34)

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Aux. In/Out Function: The Auxiliary Input/Output on the F9 can be configured for one of
several functions. Most of these functions relate to the configuration of the system.
The available functions are:
Disabled No effect on ECU operation.
Staging Signal Output - Logic output that indicates Staging
conditions. If Staging is selected, and the
Staged injector are firing, this signal will be
high (5 volts), otherwise it will be low (~ 0
volts).
TCC Input Input - This input is used in conjunction with the
TCC Optional Output. [16.4]
Turbo Timer Input - This input is used in conjunction with the
Turbo Timer Optional Output. [16.12]
Since the Auxiliary Input/Output line can only perform one duty, all of the above
functions are mutually exclusive. i.e. although two programmable outputs exist on the
F9, only one of the TCC and Turbo Timer functions may be chosen. Keep this
function in mind when deciding on the F9 configuration you wish to run.