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Trans-Cal Industries, Inc.
Model SSD120-(XX)A-RS
&
Model SSD120-(XX)AE-RS
All Solid State
Altitude Encoder/Digitizer
Owner/Installation Manual
T.S.O. C88a Approved
Trans-Cal Industries, Inc.
Van Nuys Airport
16141 Cohasset Street
Van Nuys, CA 91406-2908
(818)787-1221 * (800)423-2913 * (818)787-8916FAX
www.trans-cal.com
30 August 2004
Document Number: 930006
Revision: C
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Table of Contents
Related Manuals for Trans-Cal SSD120-A-RS Series
Summary of Contents for Trans-Cal SSD120-A-RS Series
- Page 1 Trans-Cal Industries, Inc. Model SSD120-(XX)A-RS & Model SSD120-(XX)AE-RS All Solid State Altitude Encoder/Digitizer Owner/Installation Manual T.S.O. C88a Approved Trans-Cal Industries, Inc. Van Nuys Airport 16141 Cohasset Street Van Nuys, CA 91406-2908 (818)787-1221 * (800)423-2913 * (818)787-8916FAX www.trans-cal.com 30 August 2004...
- Page 2 This document may not be reproduced, transmitted, or copied in any form without the prior written consent of Trans-Cal Industries, Inc. The data contained herein is subject to change without notice. Please Note: It is the responsibility of the installer of this equipment, within a specific type or class of aircraft, to determine that the aircraft operating conditions are within TSO standards.
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Page 3: Table Of Contents
Table of Contents Section 1.0 Introduction.........................4 1.1 Scope............................4 1.2 Equipment Description ......................4 1.3 General Specifications ......................4 1.3.1 Operating Altitude: .......................5 1.3.2 Accuracy: ........................5 1.3.3 Serial Port Altitude Data Resolution: ................5 1.3.4 Mechanical Characteristics:..................5 1.3.5 Environmental:......................5 1.3.6 Over Range: ........................5 1.4 Parallel Altitude Data Port Specifications: ................6 1.5 Serial Port Specifications RS232 (TxD1 and TxD2):............6 1.6 Serial Port Specifications RS485..................7 1.7 Serial Communication Format:....................7... -
Page 4: Section 1.0 Introduction
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 series of altitude encoder / 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. -
Page 5: Operating Altitude
1.3 General Specifications(continued) 1.3.1 Operating Altitude: Model SSD120-30A( )-RS -1000 to +30,000 feet. Model SSD120-35A( )-RS -1000 to +35,000 feet. Model SSD120-42A( )-RS -1000 to +42,000 feet. 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 digital code and referenced to 29.92 In. -
Page 6: Parallel Altitude Data Port Specifications
1.4 Parallel 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 Auncommitted@ collectors of a transistor array and must be Apulled-up@ through a resistive load by the transponder. -
Page 7: Serial Port Specifications Rs485
1.6 Serial Port Specifications RS485 Electrical Format: conforming to the TIA/EIA RS485A standard. Logic Levels: Signal State Threshold Voltages (Signal A with respect to signal +1.5 to +6 VDC (Transmitter) -1.5 to -6 VDC (Transmitter) Note: Some RS485 equipment use A+@ and A-@ connection descriptors. The A-@ corresponds to AA@ and theA+@ corresponds to AB@. -
Page 8: Serial Communication Protocol
1.8 Serial Communication Protocol : Protocol is user selectable by grounding or leaving open pins 2 ,9 or 10 of the 15 pin D-Subminiature connector, or by selecting protocols via software see '4.6. Hardware jumpers override software settings! Leaving pin 9 and 10 of the DA-15S connector open results in the default protocol compatible with UPS Aviation Technologies= (IIMorrow) Navigation devices. -
Page 9: Section 2.0 Operation
Section 2.0 Operation 2.1 General: The SSD-120(XX)A( )-RS series of altitude digitizer=s are designed to be mounted within a pressurized or non-pressurized, but temperature controlled area within aircraft operating up to 42,000 feet MSL. Usually remotely located, the digitizer is fully automatic in operation. The parallel data output is controlled by the transponder while the serial altitude 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)A( )-RS series of digitizer may be mounted in any 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. -
Page 11: Serial Altitude Data Port Test Equipment
The output of the parallel altitude data may be monitored by any number of transponder ramp test sets which allow display of the altitude digitizer/encoder code. Alternatively, the Trans-Cal Industries= ATS-200 may be used to display the parallel data. -11-... -
Page 12: Section 4.0 Calibration And Configuration
NIST traceable pressure standard. The maximum allowed error between the primary flight altimeter and the altitude digitizer is "125 feet as required by TSO-C88a. All Trans-Cal digitizers are calibrated to NIST traceable pressure standards; however, the error allowed on altimeters at higher altitudes can lead to a combined error in excess of "125 feet. -
Page 13: Required Equipment Dynamic Calibration
4.3 Required Equipment Dynamic Calibration (See dynamic calibration block diagram.) 1. Primary flight altimeter or NIST traceable pressure standard. 2. +12 to 28VDC power supply. 3. IBM compatible computer with an available serial port. 4. Software requirement: Windows 987 using Hyper Terminal Ver. 5.0 by Hilgraeve. -
Page 14: Span Adjust Procedure
4.4 Span Adjust Procedure 1. Connect the pitot-static test equipment to the aircraft=s static line, and connect the transponder test set per the manufacturer=s recommendations. The digitizer=s two altitude adjustment potentiometers are identified as L and H, representing low and high altitude. The low adjustment is closest to the edge of the housing, and the high adjustment is closer to the center of the housing. -
Page 15: Hyper Terminal Set-Up On The Ibm Compatible Pc
4.5 Hyper Terminal 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 16: Serial Port Software Configuration
4.6 Serial Port Software Configuration This device incorporates two separate RS232E compatible outputs which may be configured via software to transmit 2 different altitude data protocols simultaneously. Thus eliminating the need for the hardware jumpers detailed in Tables V and VI. The RS485 output will repeat the TxD1 protocol and data settings. - Page 17 3. The third digit represents the protocol selection for TxD2. 0 = Use DA-15S connector protocol hardware jumpers. 1 = UPS Aviation Technologies. 1200bps. 2 = Trimble/Garmin. 9600bps. 3 = Northstar. 2400bps. 4 = Magellan, 1200bps. Example: Type P210<enter> Defined as 10 foot resolution on TxD1, TxD2 and RS485. UPS Aviation Technologies protocol transmitted on TxD1 and RS485.
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Page 18: Dynamic Calibration Adjustment Procedure
4.7 Dynamic Calibration Adjustment Procedure: 1. Construct a wiring harness per the wiring harness diagram. (This harness may beordered directly from Trans-Cal Industries. Please specify 9 pin or 25 pin connector. Request P/N: 881404.) 2. Connect the digitizer, computer and altimeter as shown in the test set-up diagram,and energize. - Page 19 8. Adjust the input pressure until the altimeter is exactly reading a 1000 foot mark.Note the difference between the digitizer and the altimeter and adjust as required. Example: The altimeter reads 10,000 and the digitizer reads 10,080. Type “S10 <enter>” (S10 represents Set 10,000feet) The digitizer will now output 10,000 feet based on the current input pressure.
- Page 20 4.7 Dynamic Calibration Adjustment Procedure(continued) You may quit the adjustment program at any time by typing “Q” twice, the digitizer output will then be displayed on the PC screen. 10. After completing the above procedure you may examine the corrections enteredinto the EEPROM.
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Page 21: Configuration And Calibration Command List
4.8 Configuration and Calibration Command List Following is a list of commands which will operate in the ADJ mode using Hyper Terminal. Top Level Menu Enter Adjustment mode. ADJ <enter> Quit and return to normal operating mode. Q <enter> Sub-Menu Clear all EEPROM data. -
Page 22: Error Correction Table
4.9 Error Correction Table Altitude Correction Altitude Correction -1000 24000 25000 1000 26000 2000 27000 3000 28000 4000 29000 5000 30000 6000 31000 7000 32000 8000 33000 9000 34000 10000 35000 11000 36000 12000 37000 13000 38000 14000 39000 15000 40000 16000 41000... -
Page 23: Digitizer / Transponder Interconnections
Digitizer / Transponder Interconnections The following 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 King KT76A/78A Pin SSD120... - Page 24 Table II SSD120 Function Cessna RT359A, Narco AT-150 AT-50, AT- Narco AT-6A AT-5, Garmin GTX 327 Pin 15 Pin RT459A, RT859A Pin 50A Pin Number AT-6 Pin Number Number Conn. Number Output 13 or 25 or Enable aircraft ground 8 or 14 to 14 to 28VDC 28VDC...
- Page 25 Table III SSD120 Edo-Air RT-777 Genave Beta 5000 Collins TDR 950 Radair 250 Pin 15 Pin Function Pin Number Pin Number Pin Number Number Conn. Output Connect to Enable aircraft ground. 8 or 14 to Connect to Connect to 28VDC aircraft’s avionics aircraft’s buss protected by a...
- Page 26 Table IV SSD120 Function Bendix Bendix Wilcox UPS AT 15 pin TPR-2060 TR641A/B 1014A Apollo SL70 Conn. Pin Number Pin Number Pin Number Pin Number Output Connect to aircraft Connect to Connect to aircraft Connect to aircraft Enable ground. aircraft ground. ground.
- Page 27 Table V Serial Port Connector, 15 Pin D-Subminiature DA-15S Function Ground 10 Ground for 10' resolution. TxD111 Ground10 RS485B(+) RS485A(-) Ground10 Protocol Select see Table VI Protocol Select see Table VI Spare TxD211 Program Enable Spare Spare Table VI Protocol Selection: DA-15S D-Subminiature Connector Function Table Protocol Selection Open Open...
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Page 28: 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 29 Trimble Trimble 2101 Approach Plus GPS Receiver Trimble 2101 Trimble 2101 IA-RS232C-R Trimble Signal Port 1 Port 2 Serial I/O Connector DA-15S 1 or 5 RxD+ 4 or 12 RxD- 3 or 20 3 or 20 1 or 5 Ground Protocol assignment, jumper pin 10 to ground on pins 1 or 5 or 8 Optional, jumper pin 2 to ground for 10'...
- Page 30 Garmin International Garmin 400 Series GPS Devices IA-RS232C-R Garmin Serial I/O Connector 78 Pin Conn. (P4001) Function DA-15S 4 or 12 Ground 1 or 5 77 or 78 Protocol, jumper pin 10 to ground. Optional, jumper pin 2 to ground for 10' resolution.4 Garmin 400 series GPS software configuration To allow the Garmin 400 series GPS to communicate with the SSD120-(XX)A-RS232 go to the Main RS232 Config page and set channel 1 input to Icarus-alt.
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Page 31: Narco At-50 And At-50A Installation
Narco AT-50 and AT-50A Installation Narco AT-50 and AT-50A Installations The Narco AT-50 or AT-50A transponder will not accept data from the Trans-Cal SSD120-(XX)A until the following modifications have been completed: 1. The strobe modification as outlined in Narco service bulletin no. AT-50A-5 dated 19 February 1975 has been performed on the transponder. -
Page 32: Wiring Harness Diagram Part Number 881404
Wiring Harness Diagram Part Number 881404 -32-... -
Page 33: Span Adjust Block Diagram
Span Adjust Block Diagram -33-... -
Page 34: Dynamic Calibration Block Diagram
Dynamic Calibration Block Diagram -34-... -
Page 35: Temperature Vs. Warm-Up Time
Temperature vs. Warm-up Time Figure 3 Temperature vs. Warm-up Time Seconds (±20%) -35-... -
Page 36: Outline Drawing
Outline Drawing Increase Altitude -36-... - Page 37 Trans-Cal Industries, Inc. Solid State Altitude Digitizer Part Number Ordering Information SSD120-XX X X-XXXX Max. Operating Altitude (Feet) 30,000 35,000 42,000 50,000 62,000 65,000 80,000 85,000 100,000 -100 Model Identifier Nomenclature Encoder / Digitizer Modular Encoder Servo Module Operating Temperature Range...
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Page 39: Warranty Registration
No other obligation or liability is expressed or implied. For the above warranty to become effective, the attached registration card must be completed and returned to Trans-Cal Industries, properly filled out and signed by the dealer selling or installing this equipment.