Honeywell BENDIX/KING KAP 140 Maintenance Manual page 82

4.3.8 KCM 100 CONFIGURATION MODULE INTERFACE TO THE KC 140
PIN
P1401 -- 4
P1401 -- 8
P1401 -- 13
P1401 -- 30
The KCM 100 Configuration Module Interface consists of a clock, enable, data, and 5V power. All
of these signals are logic level signals (0--5V). This 3--wire serial interface is used to store
information for the KAP 140 autopilot system. The clock signal frequency will vary when it is
transmitting or receiving data but it should always be <1 MHz and > 1KHz while transmitting or
receiving data. The enable line is high during the entire time the data is being transmitted or
received. The data line is a bidirectional signal and each bit of the data is clocked in on the rising
edge of the clock. The KC 140 supplies +5V, current limited to 80mA, to the power line of the KCM
100. The ground of the KCM 100 is tied to airframe ground. The connection to the configuration
module can be tested by performing the NVM Test on the ANALOG TESTS diagnostic page.
If the ground wire becomes disconnected, the KCM 100
Configuration Module interface may appear to work, but it will work
intermittently. Under this scenario, one may experience loss of the
certification gain file information and error code logs upon power up
of the unit. It is inadvisable to disconnect the KCM 100 configuration
module from its connector with the KC 140 powered up; this can
cause loss of certification gain file information and error code logs.
Revision 2, Dec/2002
CS:15574F02.IDU
BENDIX/KING
KAP 140
DESCRIPTION
CFG_+5V
CFG_DATA
CFG_ENABLE
CFG_CLK
NOTE
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