Trans-Cal SSD120 M Series, Инструкция по установке и калибровке

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Section 2.0 Operation
2.1 General
The SSD120-(XX)M series of altitude encoder/digitizer’s are designed to
be mounted within the body of a flight altimeter operated up to 80,000
MSL. The encoder/digitizer is fully automatic in operation. The parallel
data output is controlled by the transponder while the serial data is
transmitted asynchronously.
2.2 Operating Instructions
2.2.1 Parallel Altitude Data
Place the transponder in Mode ‘C’, altitude reporting mode, and
apply power to the transponder and the encoder/digitizer. In some
installations, the encoder/digitizer will be automatically supplied
power when the transponder is energized; in others, power to the
encoder/digitizer is provided directly from the avionics buss,
follow the power-up procedures recommended by the transponder
manufacturer.
In some installations the transponder controls the encoder/digitizer
by enabling and disabling its outputs. In other installations, the
encoder/digitizer’s output is not controlled by the transponder and
is continuously enabled, (encoder/digitizer pin A is grounded.)
2.2.2 Serial Altitude Data
The serial data communication is fully automatic and transmission
begins immediately upon power up to the encoder/digitizer. The
serial communication is not affected by the strobe function on the
parallel data.