Operation Manual

LX90xx system Version 4.0 February 2014
Page 142 of 151
11.2 Rear Seat Device
In two-seat gliders it is possible to install the rear seat device. The rear seat device looks
almost identical to the main display unit. However inside the device there is no GPS or
Flarm module. The rear seat device must be connected only to the main display unit via the
RS485 bus system. The basic idea of two-seat configuration is that both devices work
independently from each other with the possibility to exchange various data on user request
or automatically.
11.2.1 Data Exchange
Because the GPS and Flarm modules are not integrated in the rear seat device this data is
received from the main display unit through RS485 bus.
After power on, the main display unit also sends polar data and pilot information to have
them synchronised in both devices.
The user can define which data will be automatically synchronised between the devices.
Waypoint and task databases are not synchronised between the devices. In order
to have databases synchronised, you have to use the SD card and copy files from
the rear to front device or vice versa. See Chapter 6.1.5.4 for how to copy
waypoint files.
To set up data which is going to be received from the rear seat device, enter the “Rear seat
device” menu on Main display unit (see Chapter 6.1.12.8).
To define which data is going to be received from the main display unit go to “Front seat
device” menu (see Chapter 6.1.12.8).