BFF Motion Driver V2.6
introduced direct support for Dyadic SCN5 linear actuators.
SCN5 actuators are attractive for lower load systems because
they have built-in servo controllers and can operate
directly from the motion position demand outputs from the BFF
Motion Driver without other servo controller hardware.
SCN5 Actuators have a relatively low load
capacity (~10 kgf) and are commonly used in 2 DOF racing sim
motion seats. They might struggle on a full 3 DOF motion platform with
an active heave axis and the main focus of this article is on
their use in a 2 DOF (pitch/roll) set up. This will be of
interest to builders with existing SCN5 powered seats who wish
to try a dedicated flight motion driver.
The actuators can be connected to the Motion
Driver PC using manufacturer supplied adaptors and cables or a
lower cost USB-RS485 adaptor and DIY cabling. On my tests I used
2 x 150mm stroke SCN5 actuators connected using a single
Devantech USB-RS485 adaptor to the driving PC. They are
powered separately from a 24V DC supply; I use a lead-acid
The basic system configuration is as shown above.
Each SCN5 is given a unique address on the data bus (Termi-BUS) and is instructed
by the motion driver software through the single RS485 adaptor.
Parameters such as active stroke length, motion speeds and
accelerations and servo loop gain are all adjustable through the
motion driver configuration settings to allow optimal tuning.
BFF Motion Driver - SCN5 Actuator Start Guide has more
details on the use of SCN5 actuators with the v2.6 motion
The V2.6 Beta software can be downloaded from the
downloads page here. Please
note it is Beta software and may contain bugs - take care in its
use and please report any issues you find.
The download package includes sample .bff
configuration files for use with 2 x SCN5 actuator rigs - more
details in the Start Guide. You will need to experiment with the
settings and read-up on the general motion driver cue settings
to get the best configuration for your system.
The V2.6 Beta software for MS FS9/X.
You will need Pete Dowson's FSUIPC installed in your FS software.
Many thanks to Toni o'Kelly for beta testing the
Falcon F4-AF Beta Driver Version
I've now upgraded my old Falcon F4 v1 motion
driver to V2.6beta. It has all the same data output options as
the MSFS V2.6 and it is available to download and try from the
Falcon F4 exports a rather limited data set
compared to MSFS and X-Plane and this has affected the motion
driver functionality a bit. Please read the
information document in the driver zip archive. The main
effect is that the Visual System Motion output can't be
supported with the limited flight dynamics data available so I
have disabled it on the Falcon F4-AF driver. I'll reinstate it
as soon as I can figure out how to get the data I need.
However the main motion drive output is mainly
unaffected - although the way the driver has to handle in-game
pauses is slightly altered.
For a great resource on the use of SCN5 actuators
in DIY racing sims see -
X-Simulator SCN5 Hardware Thread
To download the Dyadic PC Tools Software go to
this page - this set up software should also be available from
your SCN5 supplier.
Main SCN5 distributer -
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