Section 1.0 Introduction; Scope; Equipment Description; General Specifications - Trans-Cal SSD120-A-RS Series Owners & Installation Manual

Section 1.0 Introduction

1.1 Scope

This manual provides detailed installation, calibration and operating instructions for Trans-Cal
Industries= Model SSD120-(XX)A-RS and SSD120-(XX)AE-RS
digitizer.

1.2 Equipment Description

Approved under F.A.A. TSO-C88a, the Model SSD120-(XX)A-RS and SSD120-
(XX)AE-RS is an all solid state electronic device which when connected to an
aircraft static and electrical system, converts pressure altitude information into
parallel and serial digital data.
The parallel altitude data protocol is set forth in the (ICAO) International
Standard for SSR Pressure Altitude Transmission. In accordance with U.S.
National Standards for Common System Component Characteristics for the I.F.F.
Mark X (SIF)/Air Traffic Control Radar Beacon System SIF/ATCRBS.
The serial altitude data protocol has selectable resolution (refer to Tables V & VI
and '4.6 ) and is provided on two (2) RS232 outputs (TxD1 and TxD2) and one
(1) RS485 output which may be used to provide pressure altitude data to GPS or
other on board navigation devices. The RS485 data will utilize the same data
protocol and format as assigned to TxD1.

1.3 General Specifications

Operating Voltage:
Operating Current all models:
Operating Temperature:
Storage Temperature (non-operating) all models: -65EC to +85EC.
Warm-up time: 30 second self-test, see Figure 2.
Weight: 10 oz.
1
SSD120-(XX)AE-RS Extended operating temperature range: -55EC to +70EC.
2
Longer warm-up times will be experienced when operated at +12 VDC.
Model SSD120-(XX)A-RS
Model SSD120-(XX)AE-RS
Model SSD120-(XX)A-RS
Model SSD120-(XX)AE-RS -55E to +70EC.
-4-
1
series of altitude encoder /
+12 to 30 VDC.
2
+12 to 30 VDC.
0.55 Amps. (550MA)
-20E to +70EC.