GRT Avionics, Inc.
May 2019
Sport EX/Horizon EX Install. Manual
7
Rev. A
•
The baud rate set for the serial port in the display unit corresponds to
BOTH
the
serial input and output.
•
The type of function for a DU serial input does not have to match; the baud rate,
however,
MUST
match. For example, Serial Input 1 on the DU could be wired to
an EIS engine monitor. It is configured for 9600 baud. Serial Output 1 on the DU
could then be used to send altitude data to a transponder, if it accepted data at
9600 baud.
•
The hardware design of the serial inputs to the DU
can’t exceed RS-232 standard
loads; this ensures that any standard RS-232 output can provide data to multiple
EFIS display units with no loss of fidelity. For example, since serial output from an
external GPS can be wired to multiple GRT EFIS display units, its signal can be
corrupted if the loading from the EFIS exceeds the standard.
•
The Sport EX serial ports are all high-speed, meaning that any serial port can be
used with any device, regardless of the baud rate the connection may require.
2-2: Common Equipment Interfaces
This section is an overview of the typical interconnections that are made to other avionics.
It is intended to inform you of the benefits of connecting your GRT EFIS to other
equipment. Refer to the latest revisions of the
Equipment Supplements
for each third-
party component for the most detailed and up-to-date wiring and setup information
(
www.grtavionics.com/home/compatible-equipment/
).
2-2-1: Other GRT Avionics Display Units
—the Inter-Display Unit Link
This connection allows two or more display units to function as one integrated system, so
pilot inputs do not need to be duplicated on each display unit. The following pilot entries
are always shared over the inter-display unit link:
•
Baroset
•
Display Dimming Level
•
Flight Plan
•
Limits (compared between display units at power-up)
•
Autopilot/Flight Director Mode and Targets
•
EFIS Navigation Mode
The inter-display unit link can also share specified data that only a single display unit may
be receiving, including any analog inputs.
