BENDIX/KING
KAP 140
Page 3--4
Revision 2, Dec/2002
CS:15574F02
3.3.3 DISCRETE INPUT STRAPS/VALIDS SCREEN
Pressing ‘V’ when the Diagnostics Menu screen is displayed will cause the Discrete Inputs
Straps/Valids screen, shown in Figure 3--4, to be displayed. Pressing the ‘ENTER’ key at this point
will return the user to the Diagnostics Menu screen.
System mode: Diagnostic
DISCRETE INPUT STRAPS/VALIDS
Description Value
-------------- -------
Internal Software Strap 1
Aircraft Strap 06
Roll Servo Valid YES
Roll Steering Valid YES
Analog Valid YES
Rate Gyro Valid YES
GPS Select YES
Middle Marker YES
Pitch Servo Valid YES
GS Valid YES
NAV Valid YES
DG Valid YES
PFT Control Enable NO
HW Strap NO
Press CR to exit:
FIGURE 3--4 DISCRETE INPUT STRAPS/VALIDS SCREEN
The Discrete Input Straps/Valids screen contains the current status of internal and external
configuration straps and validity discretes and Middle Marker.
ITEM DESCRIPTION
Internal Software Strap Internal strap code derived from internal circuit
jumpers CJ1 and CJ2 located in the unit bezel
assembly. These internal straps are used by
software to identify the version of unit hardware: 0 =
Dual Axis with Altitude Preselect (--7xxx), 1 = Dual
Axis (--5xxx), 2 = Single Axis (--2xxx).
Aircraft Strap Strap code derived from open/ground discrete inputs
which represent the harness strap value for a
particular aircraft installation. Identified as
STRAP_6 through STRAP_1 in the harness,
STRAP_6 represents the most significant bit and
STRAP_1 the least significant bit. A ground on the
input represents logic “one” and an open represents
a logic “zero”. During preflight test, these inputs are
compared against the strap code defined in the
certification data stored in the configuration module.
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