EMS Technologies Canada Ltd. HSD-400 Manuale Utente

This section provides the information required to determine the operational readiness of the 
HSD-400 terminals and to aid service personnel in diagnosing system faults, including the 
following sections:

•

•

•

•

The operational and diagnostic tests described in this section require using the HSD-400 
terminals built-in diagnostic tool referred to as the HSD-400 terminal Maintenance Port Utility 
(MPU). This section provides detailed descriptions of the HSD-400 terminal MPU menus, 
reports, and basic user instructions. See page 4–2 for maintenance port cabling notes.

Note: Depending on the version of software installed, the MPU report and menu screens 

displayed may differ from those shown as examples in this manual.

Usually, terminals require testing for one of the following reasons:

•

To verify the operational readiness of the terminal during and after installation on an 

aircraft.

•

To verify that a fault exists and produce system reports for troubleshooting purposes.

•

To verify the operational readiness of repaired LRUs during re-installation on an 

aircraft.

This section presents software loading and test and fault isolation procedures for the 
HSD-400 terminals. All test and load procedures require the HSD-400 terminal MPU, 
which is accessed by connecting to the maintenance port of the terminal. 

Table 4-1 lists the equipment required to access the HSD-400 terminal MPU and perform 
operational and diagnostic testing and software loads on the HSD-400 terminal. 

Table 4-2 lists the optional equipment or information that, although not required, may 
increase test efficiency or allow for optional diagnostic procedures. Equivalent 
substitutions may be used.

Computer Standard VT-100 386 CPU, 20-MHz or 

higher

1

VT-100 terminal 

emulation program

HyperTerminal©, 

ProComm Plus©, or 

equivalent

Serial communication 

program using an RS-232 port 1