Technical data

Product Specification
HIF-2121/R5 CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO: 965-1176-601 REV: D SHEET 127
Input Signal Monitoring: All input signals will be monitored and any failed signals, busses, or LRU’s will by identified.
Watchdog Monitor: The Watchdog Timer resets the processor when the software fails to complete its execution cycles in the
specified amount of time.
Aircraft configuration database Monitor: The configuration database is monitored for database integrity.
Image DSP Tests: The Image DSP tests check the basic image Digital Signal Processor (DSP) functionality, the ability of the
host processor to boot up and communicate with the image DSP.
Flight History Write Test: The flight history portion of the EGPWS memory will be tested for write integrity.
6.10.9 RS-232 Test Interface
There is an RS-232 input/output port on the front of each EGPWC for test control and data readout. This port serves as
access to signal monitoring, flight history, initiating BITE tests, updating databases and other functions. The interface is
intended for human interaction, but can also be used for custom interface programs such as the Honeywell VIEWS utility.
The RS-232 interface is used for test control and data readout functions and is available both in the air and on the ground.
At power up, the EGPWS will begin polling the port for the RS-232 start up command. When the start up command, “^Z”,is
detected the port will become active. The port will remain active until the RS-232 end session command, “^Y”,isgivenor
until power is cycled.
The RS-232 interface supports the commands described in table 6.10.10-1.
The PC interface is described from the PC point of view. In the following descriptions, items in quotes are command line
messages in ASCII/binary. The “<“ and “>“ symbols enclose parameters chosen by the user and are not literal values (e.g.
<CR> indicates the Carriage Return key). Characters preceded with the carat (^) are an ASCII Control Character (i.e. “^A” is
0x01 hex NOT 0x41).
All commands must be terminated by a <CR>, except “^Z” and “^Y”, and are NOT case sensitive.
Typing mistakes may be corrected using the <BACKSPACE> key.
The response to any invalid command is “INVALID COMMAND”.