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Section 3.0 Installation and Calibration
3.1 Mechanical Installation
The SSD120-(XX)M series altitude encoder/digitizer may be mounted in
any attitude within the body of the altimeter, but should be mounted to
insure no interference with the altimeter mechanism, and no obstruction of
the SSD120-(XX)M static pressure inlet. The mounting position should
insure that the 26 pin mating connector does not interfere with the
altimeter static port connection or other electrical or mechanical
connections required for the altimeter's operation.
Manufacture an opening in the altimeter case per the outline drawing for
the Connector Panel Cutout 881667. Be sure to provide a flat surface to
which the connector O-Ring can seal. Secure the encoder/digitizer to the
altimeter case using the 1
for mechanical dimensions and the sample installation diagram.
3.2 Electrical Installation
The encoder/digitizer is designed to operate with a +9 to +28VDC power
source. This voltage can be A+ switched power provided by the
transponder or can be provided by the avionics buss, protected with the
appropriate fuse or circuit breaker.
3.2.1 Parallel Altitude Data Connection
3.2.2 Serial Altitude Data Connection
c
-18 nut provided. Refer to the outline drawing
The outline drawing provides electrical connector pin/function
data. Use this information when connecting the encoder/digitizer to
the transponder. In some installations where older transponders are
in use, the transponder may not provide an "altitude disable"
function. In this case a panel mounted switch may be required.
Connect the TxD (transmit data) pin X (TxD1) or pin U (TxD2)
from the connector to the receive data RxD port on the GPS or
other navigation device. See connection Table V as well as the
GPS Connection Data. Be sure to connect a ground from the
encoder/digitizer to the receiving GPS unit to ensure good data
transmission. Shielded cable is recommended for both serial and
parallel data wiring assemblies.
10
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