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Section 3.0 Installation and Calibration:
3.1 Mechanical Installation
attitude within the internal structure of the aircraft. DO NOT mount the digitizer
in the direct airstream of either hot or cold air ducts. The mounting position
should allow for a short pressure line from the digitizer to the altimeter, access to
the digitizer=s adjustments, and ample room for a service loop for the
interconnecting cabling to the transponder, GPS or other navigation device.
digitizer or the mounting tray to the airframe. Secure mating connectors to the
digitizer housing using the #4-40 screws provided. Refer to the outline drawing
for mechanical dimensions and the installation block diagram.
3.2 Electrical Installation:
source. These voltages can be A+ switched power provided by the transponder or
can be provided by the avionics buss. If using the avionics buss, protect the circuit
with a one amp fuse or circuit breaker.
Parallel Data Connection
information. Use this data when connecting the digitizer to the transponder. In
some installations where older transponders are used, the transponder may not
provide an Aaltitude disable@ function. In this case, an instrument panel mounted
switch for this function may be required.
Serial Data Connection
(Table V lists the pin assignments for the serial port connector.)
the DA-15S D-Subminiature connector to the RxD (receive data) port on the GPS
or other navigation devices. All grounds on the DA-15S D-subminiature
connector are internally connected to ground and may be used to ground protocol
pins, as well as provide data ground to the receiving GPS or other device. Pin 3
(RxD) of the DA-15S connector is used for calibration only. See Table V for
connector pin assignments and '4.6 for software assigned protocols, and '4.7 for
calibration data. Shielded cable is recommended for both serial and parallel data
wiring harnesses.
The SSD120(XX)A( )-RS series of digitizer may be mounted in any
Use #4-40 machine screws, sheet metal screws, or pop rivets to attach the
The digitizer is designed to operate with either a 14 or 28 VDC power
The outline drawing provides electrical connector pin/function
Connect the TxD1 or TxD2 and/or the RS485 port (transmit data) from
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