Operation Manual

LX90xx system Version 4.0 February 2014
Page 66 of 151
This input wire is set open (not grounded) as a factory default on delivery.
6.1.12.1.4 Airspeed Offset
Some gliders are having quite big difference between calibrated airspeed and indicated
because of imperfect static ports (e.g.: Cirrus Standard). As airspeed effects wind
calculation. It is possible to define an airspeed offset to improve wind calculation.
Vario indicator will ignore this setting and shows not corrected airspeed.
6.1.12.1.5 Digital inputs
V9 or V5 variometers are having four programmable digital inputs. They are labelled with
IN1, IN2, IN3 and IN4 on V5/V9 cable-set. See chapter 4.5.3 for more details on vario unit
wiring diagram. In current version digital input can represent the state of following actions:
 Gear down and lock
 Airbrakes open
 Water ballast open
Digital input shall be wired via switch to ground and it shall open or close, when selected
action is performed. A green light will light.
If necessary, check Invert check box, to reverse the operation of digital input.
Once digital inputs are connected the system will warn pilot, if airbrakes are open on take-
off and when gear is not locked prior to landing.
6.1.12.2 Vario Indicator Setup*
The vario indicator is always part of the vario unit. However an unlimited number of
secondary vario indicators can be connected to the system using the RS485 system bus.
There are three different types of vario indicators; V5 vario indicator, which is standard
part of V5/V9 variometer, V80 vario indicator and old LCD or USB-D vario indicator.
LCD vario indicator and USB-D type of indicator are setup through menu LCD Indicator,
whereas others, more modern vario indicators, are having its own menu item identified with
serial number.
LXNAV is highly recommending upgrading old LCD or USB-D type of vario unit to
latest technology vario unit. Please contact local dealer or LXNAV for more
details.