1: 2-wire control 2; separate enabling function with direction.
In this mode, the defined FWD is enabling terminal, and the
direction is determined by the state of REV.
2: 3-wire control 1; This mode defines Sin as enabling
terminal, and the running command is generated by FWD,
the direction is controlled by REV. During running, the Sin
terminal should be closed, and terminal FWD generates a
rising edge signal, then the VFD starts to run in the direction
set by the state of terminal REV; the VFD should be stopped
by disconnecting terminal Sin.
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