Accuracy; Mechanical Characteristics; Environmental; Over Range - Trans-Cal SSD120-N-RS5 Owners & Installation Manual

1.3.2 Accuracy

Digitizer accuracy is ±50 feet from -1000 to +30,000 feet, and ±75 feet from
30,100 to +42,000 feet, when measured from the altitude transition points of the
ICAO code and referenced to 29.92 In. Hg. (1013 MB.) See Figure 1 and §4.0.

1.3.3 Mechanical Characteristics

1.3.4 Environmental

All model SSD120-(XX)N( )-RS5 digitizers have been designed and tested to meet
the requirements of TSO-C88a and ETSO-C88a, This device is tested in
accordance with RTCA Document DO160E, dated December 2004 Environmental
Category: D1BAB[(SM)(UF)]XXXXXXZBBB(BC)TTBXXXAX. See Environmental
Qualification form for specific test information.

1.3.5 Over Range

The SSD120-(XX)N( )-RS5 series of altitude digitizers will not be damaged when
operated beyond their specified maximum altitude up to 100,000 feet MSL,
(0.1581psi) or over pressured to –5721 feet (18psi) maximum.

1.4 Parallel ICAO Altitude Data Port Specifications

Code Format: In accordance with U.S. National Standard for Common System Component
Characteristics for the IFF Mark X (SIF) Air Traffic Control Radar Beacon System,
SIF/ATCRBS.
Driver Description: The parallel altitude data output is provided by the "uncommitted"
collectors of a transistor array and must be "pulled-up" through a resistive load by
the transponder.
Pull-Up Voltage: +3 to 40Vdc.
Maximum Sink Current: 50 mA.
Maximum Cable Length: 4000 ft. (1219 meters)
Input Signal Requirement: Pin 6 (strobe or signal common) must be either grounded or
connected to the transponder.

1.5 Serial Altitude Data Port Specifications

Electrical Format: Conforming to the TIA/EIA RS-232C standard.
Logic Levels: "0", +9 Vdc. Logic "1", -9 Vdc.
Driver Output Maximum Voltage: ±25 Vdc.
Driver Load Impedance: 3KΩ typ.
The RS232E standard recommends one receiver per serial port.
Maximum Cable Length: 50 Feet. (15.24 meters)
Code Format: ASCII
Communication System: Simplex
Transmission Method: Asynchronous. (Talk only.)
Baud Rate: Selectable, 1200 bps to 9600 bps.
Transmission Rate: 2/sec.
Model Number
Model SSD120-30N( )-RS5
Model SSD120-35N( )-RS5
Model SSD120-42N( )-RS5
Mounting tray adds 1 oz. To the weights listed above
Page 7 of 57
Dimensions
See Outline Drawing
See Outline Drawing
See Outline Drawing
Weight
5.1 oz.
5.1 oz.
5.1 oz.