FCU 01
Perun V2
Enable Start in Silent Mode. When a battery is connected, the Perun initialises the motor, which the XM203 can read as a shot. Update to the latest firmware and enable “Start in Silent Mode” so the unit is not live until you tap the up or down key.
FCU 02
Spartan
This set-up uses the Invert Trigger option, currently in beta. Email boss@rdxtech.net to request access to the firmware. Thanks to rusty_mtw for the set-up instructions.
Why Invert Trigger?
The XM203 normally activates on a positive voltage. Some FCUs trigger the motor or solenoid by switching to ground, which leaves a constant positive voltage between shots and continuously activates the XM203. With Invert Trigger enabled, the XM203 activates only when no positive voltage is present.
When Invert Trigger is used, Start in Silent Mode is enabled automatically so the unit cannot fire on start-up before a positive voltage is detected.
FCU 03
Polarstar
The header is not normally used, but pin #2 provides a signal in semi mode on Rev 3.0.0 FCU firmware. With FCU firmware 3.0.4, pin #2 also works in auto.
The matching wire harness is available from Polarstar. Thanks to Frederick and Real Team 6 (RT6).
