User's Guide

DRAFT
Page 4-17
17 Mar 2016
23-15-87
SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
ARINC 781-500 SDU and SCM
© Honeywell International Inc. Do not copy without express permission of Honeywell.
H. ORT
The A781-500 system may not function properly if the ORT parameters do not match the installed
system.
(1) ORT Use and Storage
The ARINC 781 system includes a secure and user ORT. Secure ORT files must be certified
for the aircraft type on which the equipment is installed. Items in user ORT files can be
modified by individual customers and may be customized to an individual aircraft.
You can change secure ORT parameters only by uploading an ORT file. To obtain an ORT
file, contact RC Product Support.
The load procedure loads an ORT file to the SCM using an ARINC 615A data loader. You can
only load ORT data when the aircraft is on the ground and the data load discrete is asserted.
When the SDU boots, it compares the ORT file in its memory to that in the SCM. If the ORT
files do not match, the SDU loads the file from the SCM into its memory.
Some user ORT parameters can be modified in the SDU ORT. You can reset the SDU ORT
to the default values stored in the SCM in the maintenance menus.
(2) Checking the ORT
You can check the content of the ORT file through the maintenance port menus. "SDU
Maintenance Port Utility" on page 4-2 provides information about accessing the maintenance
port menus.
NOTE: The ORT includes many parameters that affect internal operations. These
parameters are not meaningful for technicians troubleshooting the satellite
communication system.
To check the ORT:
(a) In the maintenance port menus, navigate to menu 3.
(b) To list the ORT, press H.
The list of ORT parameters appears. The list is about eight pages long.
Some ORT parameters displayed are system defaults that cannot be modified through
the Secure and User ORT files.
(c) Compare the ORT parameters to the system installed in the aircraft.
I. Contact Product Support
When the troubleshooting procedures do not find a fault and the A781-500 system does not function
properly, contact RC Product Support.
RC Product Support may ask you to capture and send them system specific logs and reports.
To access logs:
(1) In the maintenance port menus, navigate to Menu 3.
(2) Turn on the text capture feature of the terminal emulator on your computer.
In HyperTerminal, click Transfer, and then click Capture Text.
DRAFT as of
4 Mar 2016