BendixKing KLN 900 - Pilots Guide - Manual (Page 156)

5-49
External Configuration Module
The external configuration module, KCM 100, is installed
with every KLN 900 and is used to make sure proper
operation occurs. For purposes such as bench operation,
the KLN 900 will operate without an external configuration
module.
When the KLN 900 is powered up under normal operating
conditions and the external configuration module is pre-
sent, the data in the external configuration module is used
as the system configuration.
If the data in the external configuration module differs
from the unit’s internal configuration data, the external
configuration module is used and copied to the internal
configuration data.
Differences between the internal and external configura-
tion data could occur if one KLN 900 unit is configured
and then removed and later a second KLN 900 unit is
installed in the aircraft. For example, if the KLN 900 unit
is initially configured correctly in the aircraft and a
replacement KLN 900 unit is later installed in the aircraft,
the external configuration module would ensure that
proper configuration was preserved.
If the KLN 900 is powered up under normal operating
conditions and no memory errors have occurred and an
external configuration module is not present, then the
internal configuration data is used.
If a memory error is detected in the external configura-
tion module during the normal start-up sequence, the
following full screen message (Figure 5-139) is dis-
played after the initialization page and the internal con-
figuration data is used. The internal configuration data
is not copied to the external configuration module
.
If a memory error is detected in the external configuration
module and a memory error is also detected in the inter-
nal configuration data, then the “Configuration Memory
Error” (figure 5-139) message is displayed and the default
values are copied to the internal configuration data. The
external configuration module shall not be changed. The
internal configuration data is used. After displaying the
above message, the KLN 900 uses the new configuration
values by resetting itself. Figure 5-140 is displayed to
inform the user that the KLN 900 will re-powerup. This
page is also displayed if an internal configuration error
occurs and no external configuration module is present.
Rev 2
Figure 5-139
ACKNOWLEDGE?
CONFIGURATION MEMORY
ERROR
Figure 5-140
ACKNOWLEDGE?
KLN 900 WILL RESET
ITSELF TO USE DEFAULT
CONFIGURATION VALUES.