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Trans-Cal SSD120 M Series Installation And Calibration Manual

Modular altitude encoder / digitizer
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Trans-Cal Industries, Inc.
Installation and Calibration Manual
(Patent Pending)
Model SSD120-(XX)M
Modular Altitude Encoder / Digitizer Series
TSO-C88a Approved
Trans-Cal Industries, Inc.
Van Nuys Airport
16141 Cohasset Street
Van Nuys, CA 91406-2908
(818) 787-1221 FAX (818) 787-8916
http://www.trans-cal.com
21 June 2005
Document 881600
Revision C

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Summary of Contents for Trans-Cal SSD120 M Series

  • Page 1 Trans-Cal Industries, Inc. Installation and Calibration Manual (Patent Pending) Model SSD120-(XX)M Modular Altitude Encoder / Digitizer Series TSO-C88a Approved Trans-Cal Industries, Inc. Van Nuys Airport 16141 Cohasset Street Van Nuys, CA 91406-2908 (818) 787-1221 FAX (818) 787-8916 http://www.trans-cal.com 21 June 2005...
  • Page 2 This document may not be reproduced, transmitted, or copied in any form without prior written consent of Trans-Cal Industries. The data contained herein is subject to change without notice. Please Note: It is the responsibility of the installer of this equipment, and those performing this procedure, within a specific type or class of aircraft, to determine that the aircraft operating conditions are within TSO standards.

  • Page 3: Table Of Contents

    Table of Contents Section 1.0 Introduction...................... 4 1.1 Equipment Description ..................... 4 1.2 General Specifications ....................4 1.2.1 Operating Altitude ..................... 5 1.2.2 Accuracy ......................5 1.2.3 Serial Port Data Resolution................5 1.2.4 Mechanical Characteristics ................5 1.2.5 Environmental....................5 1.2.6 Over Range ......................

  • Page 4: Section 1.0 Introduction

    Section 1.0 Introduction This manual provides detailed installation, calibration and operating instructions for Trans-Cal Industries’ Modular Altitude Encoder/Digitizer Model SSD120-(XX)M. 1.1 Equipment Description Approved under F.A.A. TSO-C88a, the Model SSD120-(XX)M is an all solid state electronic device which, when installed within a flight altimeter and connected to the aircraft’s electrical system, converts pressure altitude...

  • Page 5: Operating Altitude

    1.2.1 Operating Altitude Model SSD120-50M -1000 to +50,000 feet. Model SSD120-62M -1000 to +62,000 feet. Model SSD120-65M -1000 to +65,000 feet. Model SSD120-80M -1000 to +80,000 feet. 1.2.2 Accuracy Accuracy throughout operating temperature range -30° to +70°C. -1000 to +42,000 feet ±50 feet. +42,100 to maximum altitude ±75 feet.

  • Page 6: Parallel Altitude Data Port Specifications

    1.3 Parallel Altitude Data Port Specifications Code Format: In accordance with the U.S. National Standard for Common System Component Characteristics for the I.F.F. 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”...

  • Page 7: Serial Communication Format

    1.5 Serial Communication Format Model SSD120-(XX)M and carries out serial communication asynchronously with the “Start/Stop” system. This system puts a start bit at the head of a character, and then in turn adds data bits, a parity bit, and a stop bit.
  • Page 8 1.6 Serial Communication Protocol (continued) Protocol 3 is compatible with some navigation devices manufactured by Northstar and Garmin. At a baud rate of 2400 bps the encoder sends a 10 byte message. The message begins with ALT followed by a space and five altitude bytes;...

  • Page 9: Section 2.0 Operation

    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.

  • Page 10: Section 3.0 Installation And Calibration

    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.

  • Page 11: Serial Data Port Test Equipment

    The output of the parallel port may be displayed on any number of ramp test sets capable of interrogating the transponder and displaying the altitude code from the encoder/digitizer. Or the Trans-Cal ATS-200 test set may be used to display the encoder/digitizer output.

  • Page 12: Section 4.0 Configuration And Calibration

    Section 4.0 Configuration and Calibration 4.1 Configuration and Calibration Procedure Overview: This procedure will allow configuration of the serial ports on the SSD120-(XX)M to transmit the desired protocol, format and altitude data resolution. This procedure will also allow adjustment to the calibration curve of the SSD120-(XX)M to match the encoder/digitizer output to a flight altimeter or NIST traceable pressure standard.

  • Page 13: Required Equipment For Calibration

    4. Digitizer/PC interface cable. (See wiring harness diagram or order 881668 from Trans-Cal Industries.) 5. Vacuum/pressure source and control capable of exercising the digitizer/altimeter, pressure standard over the digitizer’s operating range. (Optional: ATS-200 or equal device which will allow the...

  • Page 14: Hyper Terminal Software Set-Up On The Ibm Compatible Pc

    4.3 Hyper Terminal Software Set-Up on the IBM Compatible PC Boot up the computer and start the Hyper Terminal program. Hyper Terminal may be located in the Programs Section or in the Accessories Section under Communications . Under the New Connection window. (Identifies the new connection.) - Choose an icon then select an identifying title such as “Test.”...

  • Page 15: Ssd120-(Xx)M Serial Port Software Configuration

    2 different altitude data protocols simultaneously. 1. Construct a wiring harness per the Wiring Harness Diagram 881668. (This harness may be ordered directly from Trans-Cal Industries. Please specify 9 pin or 25 pin connector.) 2. Connect the digitizer to an IBM compatible computer running Hyperterminal as described in §...
  • Page 16 Apply power to the digitizer and after the data appears on the PC screen type the following: Type <enter> The Digitizer will return “?> current altitude” Type ADJ <enter> Access the digitizer adjustment program. The Digitizer will return A= Type <enter>...

  • Page 17: Ssd120-(Xx)M Calibration Adjustment Procedure

    1. Construct a wiring harness per the Wiring Harness Diagram 881668 . (This harness may be ordered directly from Trans-Cal Industries. Part Number 881668 please specify 9 pin or 25 pin PC connector.) 2. Connect the digitizer, computer and altimeter as shown in the Calibration Block Diagram 881669 , and energize.
  • Page 18 CAUTION: Always refer to the altimeter manufacturer’s data for maximum rate of climb or descent and any special test conditions which must be complied with. Adjust the input pressure until the altimeter is exactly reading a 1000 footmark. Note the difference between the digitizer and the altimeter.
  • Page 19 After completing the above procedure you may look at the corrections entered into the error table. Type “ D<enter> ” to dump the error data and read the current error curve on the PC screen. The following error table should appear: 00= 000 01= 000 02= 000...

  • Page 20: Configuration And Calibration Command List

    4.6 Configuration and Calibration Command List Following is a list of commands which will operate in this Calibration mode. Top Level Menu ADJ <enter> Enter adjustment mode. Quit command. Returns to normal operation. Sub-Menu CLR <enter> Clear command clears error table data. D <enter>...

  • Page 21: Error Correction Table

    4.7 Error Correction Table Altitude Correction Altitude Correction Altitude Correction -1000 24000 51000 25000 52000 1000 26000 53000 2000 27000 54000 3000 28000 55000 4000 29000 56000 5000 30000 57000 6000 31000 58000 7000 32000 59000 8000 33000 60000 9000 34000 61000 10000...

  • Page 22: Encoder/Digitizer / Transponder Interconnections

    Encoder/Digitizer / Transponder Interconnections The following encoder/digitizer/transponder interconnections are provided as a quick reference only, and though they are correct to the best of our knowledge, always consult the latest installation, operation, and service bulletins from the transponder manufacturer. Table I Function King KT76/78 Pin SSD120 King KT-76A/78A Pin...
  • Page 23 Table II Function Cessna RT359A, Narco AT-150, Narco AT-6A Garmin GTX SSD120 26 Pin RT459A,RT859A AT-50, AT-50A AT-5, AT-6 Conn. Pin Number Pin Number Pin Number Pin Number 13 or 25 or Strobe aircraft (Signal Common) ground. 14 to 14 to 28VDC 28VDC Input Input...
  • Page 24 Table III SSD120 Function Edo-Air RT-777 Genave Beta Collins Radair 250 26 Pin Pin Number 5000 Pin TDR950 Pin Pin Number Conn. Number Number Connect to Strobe aircraft (Signal Common) ground. 14 to Connect to Connect to 28VDC aircraft’s aircraft’s Input avionics buss avionics buss...
  • Page 25 Table IV SSD120 Function Bendix TPR- Bendix TR641 Wilcox 1014A UPS AT 26 Pin 2060 Pin A/B Pin pin Number Apollo SL70 Conn. Number Number Pin Number Connect to aircraft Connect to aircraft Connect to aircraft Connect to aircraft Strobe ground.

  • Page 26: Pin Connector Assignments

    26 Pin Connector Assignments Table V...

  • Page 27: Gps Connection Data

    GPS Connection Data Given the speed with which new GPS units are entering the market, it is impossible to provide data on every device. The following digitizer/GPS interconnections are provided as a quick reference only, and though they are correct to the best of our knowledge, always consult the latest installation, operation, and service bulletins from the GPS manufacturer.
  • Page 28 Trimble 2101 Approach Plus GPS Receiver Trimble Trimble 2101 Trimble 2101 SSD120-(XX)M 26 Pin Connector Signal Port 1 Port 2 RxD+ R or W U or X Ground 3 or 20 3 or 20 R or W Configure the SSD120-(XX)M for Trimble/Garmin protocol.
  • Page 29 2101 I/O Approach Plus GPS Receiver Software Configuration - Installation Setup Access the 2101 installation setup submenu and go to the SERIAL I/O SETUP. Select the GPS serial port which is to receive the pressure altitude data, SERIAL-1 IN or SERIAL-2 IN. Set data format to ENCODER .

  • Page 30: Pin Connector Cutout 881667

    26 Pin Connector Cutout 881667...

  • Page 31: Wiring Harness Diagram 881668

    Wiring Harness Diagram 881668...

  • Page 32: Calibration Block Diagram 881669

    Calibration Block Diagram 881669...

  • Page 33: Outline Drawing Modular Altitude Digitizer Ssd120-(Xx)M

    Outline Drawing Modular Altitude Digitizer SSD120-(XX)M...

  • Page 34: Wiring Diagram 101802

    Wiring Diagram 101802...

  • Page 36: Warranty Registration

    Trans-Cal’s obligation under this warranty is limited to repairing or replacing any unit returned to Trans-Cal during the life of this warranty provided: (1) The defective unit is returned to us, transportation pre-paid. (2) Prior approval is obtained from Trans-Cal.

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