User's Guide

DRAFT
Page 4-2
17 Mar 2016
23-15-87
© Honeywell International Inc. Do not copy without express permission of Honeywell.
SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
ARINC 781-500 SDU and SCM
C. SDU Maintenance Port Utility
This section describes the SDU MPU and provides the connection and cabling details required to
access and use the program.
(1) Connecting to the MPU
The MautoPU provides a system interface for fault isolation and diagnostic procedures.
To use the SDU MPU:
(a) Using a 3/32 Allen key, remove the maintenance port cover.
(b) Connect an RS-232 and VT-100 terminal (computer operating a terminal emulation
program) to the RS-232 maintenance port interface of the SDU.
The maintenance port on the front panel of the SDU provides a direct connection to the MPU
using a DB9 connector.
Figure 4-1 provides cabling details for the SDU maintenance port.
Figure 4-1. Maintenance Cable
Table 4-1 List of Required Test Equipment
Item Equipment Specification Quantity
Computer Standard PC running VT-100 terminal emulator,
such as Hyper Terminal and equipped
with an RS-232 port.
1
VT-100 terminal
emulation program
HyperTerminal©,
ProComm Plus©, or
equivalent
Serial communication program using an
RS-232 port
1
Cable RS-232 cable Maximum length 25 feet 1
Allen key Standard 3/32 inch Allen key to fit a hex screw with
a 4/40 inch head.
1
DRAFT as of
4 Mar 2016