930510 – Shadin Avionics RS-232/RS-422/RS-232 Converter
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Overview Section
The Shadin Avionics 930510 is a highly specialized, solid-state, bi-directional Serial Data Converter designed to resolve critical interface incompatibilities within an aircraft's avionic data network. This unit functions as an electrical bridge, converting data signals between the common RS-232 protocol, which typically handles low-speed, single-ended data communication (e.g., GPS navigators, fuel management systems), and the more robust, differential, high-speed RS-422 protocol, often used for longer cable runs or interfaces requiring higher noise immunity (e.g., certain display units or Flight Management System (FMS) components). Specifically, the 930510 model is configured to convert data from an RS-232 source to an RS-422 output, and simultaneously, or independently, convert a separate RS-422 signal back to an RS-232 output.
As a non-computed interface component, the converter only modifies the electrical characteristics of the data signal (voltage levels and transmission mode), preserving the original data content (baud rate, parity, data bits). This ensures seamless, reliable data flow between different generations or types of avionics equipment that were not originally designed to communicate directly, thereby simplifying integration and maintaining data integrity across the aircraft bus architecture.
Key Features Section
Bidirectional Conversion: Capable of converting RS-232 signals to RS-422 signals, and RS-422 signals back to RS-232 signals, often within the same compact housing.
Differential Signaling (RS-422): Provides the necessary differential voltage output for the RS-422 standard, offering superior noise rejection and enabling reliable data transmission over longer cable lengths compared to single-ended RS-232.
Voltage Level Shifting: Translates the bipolar voltage levels of RS-232 (typically +/- 5 V to +/- 15 V) to the differential low-voltage signal of RS-422 (typically +/- 2 V to +/- 6 V), and vice versa.
High Baud Rate Support: Designed to handle the higher data rates often associated with RS-422 devices without data loss or corruption.
EMI/RFI Hardened: Enclosed in a shielded, conductive metal case to minimize electromagnetic interference (EMI) generated by the unit and to ensure immunity to external radio frequency interference (RFI) as required by DO-160.
Solid-State Reliability: Uses certified avionics-grade electronic components (drivers and receivers) for high reliability and longevity in the aircraft environment.
Technical Specifications Section
Part Number: 930510
Component Type: Serial Data Converter / Interface Buffer
OEM Manufacturer: Shadin Avionics
Function: RS-232 to RS-422 and RS-422 to RS-232 Electrical Conversion
Input/Output Protocols: RS-232 (Single-Ended) and RS-422 (Differential)
Electrical Standard: Complies with EIA/TIA-232 and EIA/TIA-422 standards.
Baud Rate Support: Designed for common avionics baud rates (e.g., 9600, 19200, up to 115200 bps).
Power Input: 14 VDC or 28 VDC Nominal (Aircraft Bus Power)
Housing: Sealed, metal enclosure (Form factor must be confirmed with OEM drawing).
Governing Specifications: Qualified for airborne use under applicable sections of RTCA DO-160 for temperature, vibration, and EMI/RFI.
Certification Status: TSO/STC Approved (Installation must be under an approved STC or engineering order).
Aircraft Compatibility Section
General Aviation: Aircraft undergoing avionics upgrades where new equipment (e.g., modern EFIS) uses RS-422 but legacy equipment (e.g., older GPS or fuel flow) uses RS-232.
Turboprops/Business Jets: Platforms requiring extended cable runs between the cockpit and remote equipment bays where RS-422's noise immunity is essential.
Special Mission Aircraft: Systems utilizing proprietary sensors that output RS-232 but must interface with a rugged RS-422-based mission computer.
Note: The 930510's application is entirely dependent on the specific interface requirements defined in the Wiring Diagram Manual (WDM) or the Supplemental Type Certificate (STC) for the connected avionics systems.
Applications Section
Data Bus Bridging: Facilitating reliable communication between dissimilar components (e.g., a GPS navigator's RS-232 output driving a rugged cockpit display's RS-422 input).
Noise Immunity: Converting a low-power RS-232 signal to a robust RS-422 signal to prevent data corruption over long airframe cable runs that are susceptible to electrical noise.
Avionics Upgrades: Acting as a certified interface component to avoid costly replacement of functional legacy equipment that uses non-standard communication protocols.
Why Choose the 930510?
The Shadin 930510 ensures electrical compatibility and data link reliability, two cornerstones of safe avionics integration. Using non-certified or non-aviation data converters risks catastrophic data link failure due to non-compliant voltage levels, poor noise filtering, or insufficient EMI/RFI shielding. The Shadin OEM unit is specifically designed and DO-160 qualified to operate without generating or being susceptible to electromagnetic interference, which is a life-critical concern in the cockpit. This component provides a certified, plug-and-play solution that protects sensitive receiving equipment from electrical overstress while maintaining the high integrity of the transmitted digital information.
The technical superiority of the RS-422 protocol—which this converter facilitates—lies in its use of differential signaling. Unlike RS-232, which references data voltage to a single common ground, RS-422 transmits data using two separate lines (A and B). The logic state (0 or 1) is determined by the voltage difference between the A and B lines. When electrical noise or EMI couples into the cable, it affects both lines equally (Common Mode Noise). Because the receiver measures only the difference between the lines, the common mode noise is effectively canceled out, giving the RS-422 output from the 930510 its exceptional noise immunity and its ability to maintain data integrity over distances up to 4,000 feet. The internal drivers and receivers are high-speed solid-state components, ensuring rapid translation without introducing latency or timing errors into the data stream.
Note: The 930510 is a flight-critical component ensuring data transfer integrity for avionics systems. It is not a life-limited part. The unit's specific pin-out, configuration, and data line termination requirements must be performed by a certified avionics technician in strict accordance with the Shadin Installation Manual and the associated STC/Wiring Diagram Manual.
Documentation
Shadin Avionics 930510 Installation Manual: Essential for detailed wiring schematics, power requirements, and pin-out assignments for the RS-232 and RS-422 interfaces.
RTCA DO-160: Referenced Standard for Environmental Testing.
EIA/TIA Standards 232 and 422: Industry standards defining the electrical characteristics of the serial data protocols.