RS-232 Experts in Germany
for dependable device connections, matched fast with vetted freelancersHire experts who connect industrial equipment, laboratory instruments and legacy systems through RS-232, while handling serial protocols, cabling, diagnostics and embedded interfaces. FRATCH matches you quickly with precise, vetted and available freelance specialists.
Meet FRATCH Experts in Germany, who have recently used RS-232
Nazif K.
Last position:
Self Employed at Self Employed
Providing services to cover the complete electronic product design process.
- Requirement validation
- Creating / re-writing / breaking down requirements
- Requirement analysis and functional partitioning
- Component selection and risk assessment
- Component library management
- Schematics design
- Safety and reliability assessment
- HDI PCB design
- Design review against requirements
- Readiness for manufacturing review
- Readiness for testing review
- Readiness for verification review
High Power Density BLDC Driver Module with MCU as controller:
- PCB module with heatsink
- L47mm x W36mm x H19mm compact sizes
- Nominal input voltage: 48V
- Sinusoidal continuous RMS current: 50A
- STO, Digital input and outputs
- Analog signal inputs
- CANBUS interface
- RS232/RS485 interface
- Multilayer FR4 design (No aluminum PCB)
Integrated Mission Computer & Smart 5kW PDU
- Featuring 3 different current limits, in total 63 power outputs
- Featuring programmable current amplitude and on-time, in total 84 CC power outputs.
- Ethernet, CANBUS, MIL-BUS, RS485 communication interfaces
- In total 120 Open-Short, Open-GND, 28V-GND types discrete I/O interfaces
- BIT and CIT solutions to monitor output voltage, current and board temperature
Giuseppe A.
Last position:
Embedded Software Developer at Inheco
- AI Integration (LLM & RAG): Design and build of an internal intelligent RAG system (Retrieval-Augmented Generation) based on LLMs, n8n, and vector data for the automated analysis of technical documents and error logs.
- Design & Implementation: Design of a robust RS-232/UART communication interface for an SBC-based embedded device to control medical shaker systems.
- Architecture & Protocol Design: Implementation of a highly maintainable software structure (OOP, SOLID) and definition of hardware-close, resilient communication protocols including multithreading and advanced error handling.
- Quality Assurance & DevOps: Test automation using xUnit, integration tests directly on the hardware target, and maintenance of technical documentation according to strict medical technology standards via Azure DevOps.
Label: C#, .NET, LLMs, RAG, n8n, RS-232, UART, Multithreading, async/await, xUnit, gRPC/protobuf, Blazor, MudBlazor, EF Core, Visual Studio 2026, Azure DevOps
André H.
Last position:
Linux IT Admin at ReiserST
- Development and maintenance of IT architectures with embedded Linux systems.
- Designing, implementing, and optimizing backend applications and script-based solutions.
- Analyzing and resolving issues, including troubleshooting and user support.
- Developing and implementing security concepts for cloud solutions.
- Administering networks (DHCP, DNS, NTP, VPN).
- Technologies: Linux, PowerShell, Bash, Python, Ansible, Kubernetes, GitLab CI.
- Methods: Kanban.
Paul P.
Last position:
Independent Consultant – Industry/ Embedded/ IoT at Self-employed
Consulting and support in the areas of sales/business/technology/development/marketing:
- Sales, Key Account Management
- Business Development, business/corporate development
- Partner management
- Program/project management
- Product management & marketing
- Technical marketing, content marketing
- New business, innovation and technologies
Until July 2021 active as advisor and consultant for Mixed Mode in the areas of Key Account Management, Project Management and Business Development.
From Q3/2021 successful delivery of various customer projects in the area of Business Development, corporate development, consulting, coaching, technical content management, sales and marketing:
- EMS service provider and PCB test house, inspection systems: revision of company portfolio and presentation. Integration of specialized distribution for optical inspection systems from Japan: content management, marketing, communication, web, sales automation, lead generation
- Full service marketing agency – technology marketing for industry: expansion of the existing B2B and B2C marketing portfolio with industrial and technology topics: content management, presentation and focus on "technical marketing", web, target market and customer analysis, lead automation, consulting
- Software product manufacturer & software development in the field of security for Embedded & IoT: company alignment and portfolio definition for an IoT and Embedded Security company with a SaaS solution for IoT device management: building a partner network to offer complete Embedded/IoT security solutions, technical content, company alignment and portfolio definition, strategy & planning, target market and customer analysis, product marketing/USPs for the security device management tool "IoT-Suite", standards and regulations for cyber resilience (e.g. CRA, NIS2, RED), web content, SEO, management of marketing and sales agencies, CRM, sales, presentations, trade fairs, congresses, building company webinars & events
- Software engineering service provider/system house for IoT, Embedded, web, mobile and desktop applications: business development, content creation, customer acquisition and sales
- Manufacturer of memory products with security features as an add-on: memory products in standard form factors (SD, CF, SSD...) are extended with security modules such as HSM, TPM or secure elements and thus offer users secure data storage, transfer and access. Also interesting as an upgrade or retrofit solution to meet the coming new regulations and requirements regarding cybersecurity such as CRA, RED and NIS2. Business & New Business Development for the area "Embedded IoT Solutions & Security", sales & marketing. Expansion of the pure semiconductor business to include security solutions and services. Interface between management, marketing, sales and product management. Building business partners, technology partners, system integrators and resellers from the Embedded, IoT, OT and IT environment. Creating reference designs/demos/lighthouse cases and proof of concepts for cross- and reference selling. Co-marketing with security partners. Technical content creation for web, sales and marketing, webinars, social media etc. Networking, participation in trade fairs, congresses and events. Lead generation, qualification, follow-up and conversion to customer. Product definition, USPs, features. Analysis of competitors, market positioning, target markets - strategy, concept and measures - go to market.
- Marketing agency group with sales and management consulting: consulting for companies on restructuring, market analysis and market entry, go-to-market concepts, customer acquisition and expansion, new customer generation, lead generation and management, concepts and execution of campaigns (web, mail, social media, phone outreach in person or with AI voice assistant, webinars...). Processing and managing customer product data for PIM product information and DAM data asset management systems. Focus on customers in the industrial and technology environment with products and services that need explanation.
Andreas W.
Last position:
Self-employed Software Developer at amw-software.net
Daniel P.
Last position:
Freelance specialist in industrial automation technology at dPSolutions
- Self-employed PLC and software specialist focusing on automation and special-purpose machinery
- Programming, modernization, expansion and optimization of production systems, focusing on increased efficiency, data transparency and system integration
- PLC programming and safety with Siemens S7 Classic/TIA Portal, Beckhoff TwinCAT 2/3 and CoDeSys
- Development of high-level language software and database applications (.NET / C#, C++, Visual Basic .NET, Borland/Embarcadero C++)
- Development of custom software solutions for industrial automation, including embedded systems (Raspberry Pi, Arduino, NodeMCU, ESP8266)
- Integration of external systems such as reading devices, printers, scales, scanners and cameras, as well as various bus systems (Ethernet, Profinet, Profibus, EtherCAT, CAN bus, RS232, TCP/IP)
- Creation of visualizations and HMI applications with Siemens WinCC flexible, Beckhoff HMI and .NET frontends
- Planning, development and integration of machine vision solutions (Keyence, Cognex, AVS Alfavision, camera systems) in PLC and PC environments
- Design and implementation of process data collection systems and traceability solutions (100% traceability) based on Microsoft SQL Server (Compact, Express, Server), including stored procedures and direct PLC-SQL communication
- Creation of software and PLC concepts, standard function blocks and project libraries for PLC and high-level language projects
- Planning and programming of conveyor, inspection, assembly, packaging and grinding systems in industries such as automotive, chemical, food, electronics, machinery and systems engineering
- Conducting workshops and training on Siemens TIA Portal, STEP7 Classic, Beckhoff TwinCAT (including TwinSAFE), as well as topics such as architectures, safety, database integration and documentation
- Creation of technical documentation, manuals, training materials and class documentation with Microsoft Office and Doxygen
- Project management tasks from requirements analysis through planning, concept development and supplier coordination to commissioning, production support and customer support
Luca P.
Last position:
ERP Program Manager at Fiserv
The customer is undergoing a comprehensive transformation. All SAP ECC landscapes worldwide are being migrated to SAP S/4HANA, with the goal of introducing a standard template worldwide.
The program also includes the “RISE with SAP” migration and modernization program, which may involve migrating the landscapes of selected country installations to the SAP Private Cloud.
On the stakeholder side, the program reporting line extends to the company’s executive board and that of the implementation partner.
Fiserv Germany’s ERP landscape currently includes several non-standard SAP tools and applications that extend the functionality of the ECC environment and can often be integrated into downstream systems. As part of the transition to SAP S/4HANA, it is essential to assess the core functionality, integration points and future viability of these applications in order to determine their alignment with the target architecture.
The focus of the work is on providing expert advice and assessment to define the scope, strategy and roadmap for transitioning Fiserv Germany’s SAP ECC system to SAP S/4HANA.
The recommended best practices from SAP are followed and a structured approach is used to ensure a smooth transition with minimal disruption while maximizing business value.
This assessment forms the basis for a successful SAP S/4HANA transformation and ensures alignment with industry best practices, regulatory compliance and future scalability.
Migration Strategy Definition – assessment of available transition approaches based on business objectives, technical feasibility and SAP Best Practices.
Technical Readiness Assessment – conducting a system analysis to assess compatibility, custom code impact, data volume management, integration points and infrastructure readiness for SAP S/4HANA.
Business Process Impact Analysis – reviewing the latest business process documentation to define the scope and effort required to implement the necessary functions in SAP S/4HANA and to identify opportunities for process optimization.
Roadmap for Non-SAP Systems and Applications – assessment of third-party and legacy applications regarding their integration with SAP S/4HANA and recommendation of consolidation, migration or replacement strategies.
Deployment & Implementation Planning – defining a phased approach for implementation, including project schedules, risk mitigation strategies and key milestones aligned with business priorities.
This transformation takes place in phases: the Discovery phase leads to the Explore phase, which is followed by the Design phase and finally implementation.
Program management
Change management
Requirements management
Transition management
Stakeholder management
Risk management
Comprehensive coordination
Hendrik W.
Last position:
Software Test and Maintenance Support at Anton Paar ProveTec GmbH
- Add/create test specifications
- Conduct regression tests
- Conduct release tests
- Analyze Jira tickets
- Identify software defects and fix them with C#
Roland R.
Last position:
Support in Ongoing Project at Automotive Supplier
- closing the safety case
- creation of meaningful traceability matrices and targeted test expansion
- transferring requirements into other database systems
- structuring the requirements, assessing their completeness, and setting up new test cases based on use-case–based test strategies and the results of internal traceability matrices
- partial automation of tasks within a requirement assessment tool
- tools and languages: MS Teams, reqIF, Enterprise Architect, Codebeamer, proprietary tools for creating and evaluating traceability matrices (approx. 1000 x 1000)
Jiri S.
Last position:
Quality Manager/Test Management at Noriba GmbH
- Test concept creation
- Creation of test processes
- Coordination of TC development: stress tests, functional tests, performance tests, high data rate tests, integration tests, etc.
- HW testing: FPGA, RF
- Test automation and regression tests
- Ensuring 24/7 operation of the test system
- Analysis & reporting
- Regular coordination of the test team, meetings with other stakeholders
- Communication and coordination with stakeholders and the project manager
André G.
Last position:
IT Consulting Project Management / Engineering Subproject Management at T-Systems (on assignment for government agencies)
- Projects for federal networks (NdB).
- CR management, EoL change requests, design and documentation according to ITSCM.
- Data center planning.
- Project management and engineering subproject management.
- Software development for virtual server environments according to BSI.
Michael E.
Last position:
Software Developer at Continental
- Supported a telematics component in the automotive sector with SELinux and open-source license management.
- Products: SELinux, iMX8, ScanCode.
- Skills: Linux, firmware development, Python.
Sergej V.
Last position:
Software Developer Motor Control (Project "Multi DMR – Motor-Control") at Lorch Schweißtechnik GmbH
- Modification and redesign of the software for a series component
- Review of the software concept and extension of functionality
- Modification of software functions for DC motor control
- Hardware: ARM STM32G474, CAN bus, Lauterbach T32
- Software: Microsoft Visual Studio Code
Srecko S.
Last position:
Test Consultant at PROSEQUM GmbH
- Taking over operational acceptance tests for internal and external applications in a preproduction environment
- End-to-end tests across multiple systems
- Planning and implementation of acceptances based on expected loads and service levels
- Creation of test plans and automated tests
- Monitoring of systems, log analysis and creation of test reports, monitoring charts and acceptance documentation
- Support during rollouts of security and OS patches in preproduction
- Load and performance tests as well as failover/rollback tests
- Testing SOAP/REST APIs with JMeter, Grafana and Kibana
- Batch tests with Bash and log analysis
- Load and performance tests of own applications
- Test automation with JMeter and PyTest
- Maintenance and creation of Bash scripting tests
- Manual system integration tests
Tamás N.
Last position:
JAVA development for thermal printer test program at GeBE Elektronik und Feinwerktechnik GmbH
JAVA development for thermal printer test program
Further development of the free thermal printer test program in Java 1.8 AWT and Swing
Creating new plugins for sensor feedback using a real-time bar chart
Using multiple printer languages for USB, UDP, TCP and RS232 communication
Improving usability and responsiveness with threads and string buffering
Querying and displaying network configuration
Converting and processing hex data from printer responses
Advanced study of servomotors and USB bus
Enumerating available USB ports from the Windows Registry, retrieving additional information via PowerShell, parsing and listing all in a Java list box
Fixing reported database errors
Detecting if the printer driver is installed and recognizing physically connected devices
Migration to Windows 11
Handling customer tickets as part of support in C++ and Qt6
Writing CMake scripts
Compiling STM32 printer firmware with CMake and managing the process in FileMaker Pro
Technologies: Eclipse, Java 1.8, AWT, Swing, RS232, USB, TCP, UDP, PowerShell, servomotor technology, Windows 10 and Windows 11, WSL 2.4, Ubuntu Linux, CMake, Qt6, FileMaker Pro
Discover over 15,000 top freelancers
Statistics of experts using RS-232
Aggregated from the professional profiles of matched freelancers.
Experience
27 years
Position duration
3.9 years
Positions per freelancer
20
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Manufacturing, Automotive
Certification focus areas
Information Technology, Product Development, Quality Assurance
Bachelor's degree or higher
81%
Master's degree or higher
50%
Doctorate
13%
Certifications per freelancer
2
Most common languages
German, English, French
Speak two or more languages
100%
Based on our profile pool as of 19 Sep 2026.
Daily rate distribution
The chart shows how the daily rates of freelancers in this technology in Germany are distributed, based on recent contracts on our platform. Each bar covers a rate range — its height shows how many freelancers charge within that range.
Average rates of experts in Germany using RS-232
Rates are based on recent contracts and do not include FRATCH margin.
The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.
The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.
Calculated based on our freelancers’ daily rates as of 19 Sep 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
RS-232 experts industry focus
See which industries our matched freelancers work in most often — every figure is calculated live from the freelancers on FRATCH.
- Information Technology (85%)
- Manufacturing (85%)
- Automotive (69%)
- Healthcare (51%)
- Telecommunication (49%)
- Energy (46%)
- Education (38%)
- Professional Services (33%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
What RS-232 does
RS-232 is a point-to-point serial communication standard for exchanging data between electronic devices. It defines electrical signaling, connector conventions and control signals rather than a complete application protocol. Many machines still rely on it because the interface is simple, predictable and supported by long-lived equipment.
Typical systems
RS-232 appears wherever a computer or controller must communicate directly with one instrument or machine.
- Industrial controllers, PLC accessories and machine interfaces
- Laboratory, medical and measurement instruments
- Barcode readers, printers, scales and payment equipment
- Modems, console ports and legacy business systems
Ecosystem and tooling
Practical RS-232 work involves serial ports, DB-9 or DB-25 connectors, USB-to-serial adapters and terminal software. Experts also work with UART interfaces, baud rate, parity, stop bits, flow control and application protocols such as Modbus RTU when the connected equipment requires them. Oscilloscopes, logic analyzers and protocol monitors help isolate electrical, timing and message errors.
When companies need help
Companies often bring in freelance expertise when a new application must connect to older equipment or when an unreliable serial link interrupts operations. In Germany, this can include factory automation, laboratory technology and service projects involving equipment installed on site. Remote analysis is often possible, while cabling, commissioning and fault isolation may require access to the physical system.
- Replace a failing serial interface or adapter
- Integrate equipment with custom software
- Diagnose corrupted, delayed or missing messages
- Document a legacy connection for maintenance
RS-232 compared
RS-232 suits short, direct connections between two devices. RS-485 is usually preferred for longer cable runs, multi-drop networks or harsher industrial environments, while USB offers a more modern host-peripheral connection but can add driver and compatibility concerns. Ethernet-based interfaces provide broader networking options, yet may require more configuration and security planning.
What strong specialists bring
Strong professionals begin with the equipment manuals, pinout and protocol specification instead of guessing from connector shape. They verify signal levels, cable wiring, serial settings and message framing, then test with realistic operating conditions. Clear documentation should cover interface parameters, error handling, recovery behavior and any USB-to-RS-232 dependencies so the connection remains maintainable.
Frequently asked questions
Need clarity? These are the questions we hear most often about RS-232.
RS-232 is used for direct serial communication between a computer, controller or terminal and one external device. Common examples include laboratory instruments, industrial equipment, printers, scales, modems and console interfaces. The application protocol carried over the connection depends on the equipment.
RS-232 is designed for point-to-point communication, while RS-485 supports bus-style connections and is better suited to longer cable runs or multiple devices. RS-485 can also tolerate industrial conditions more effectively when the network is designed correctly. The right choice depends on distance, topology, electrical environment and the equipment already installed.
A capable RS-232 specialist should understand UART behavior, serial port configuration, connector pinouts and USB-to-serial adapters. Experience with embedded systems, PLC communication, Modbus RTU, device drivers and test equipment is useful when the interface sits inside a larger control or data-collection system.
A straightforward RS-232 connection may only require careful configuration and testing, but legacy integrations can involve undocumented wiring, custom message formats or unstable hardware. Choose a professional who has handled comparable equipment and can show a method for validating electrical signals, framing, error handling and recovery.
Much of an RS-232 project can be handled remotely when documentation, logs and secure access to the host system are available. On-site work is more suitable for checking cabling, connectors, signal levels and machine behavior. German-language communication may help when the project involves local operators, maintenance teams or equipment documentation.
Before working with RS-232, a freelancer should confirm the device manuals, connector type, pinout, cable length, baud rate, parity, stop bits and flow-control settings. They should also identify the application protocol, expected message format and safe test procedure. These details prevent configuration errors from being mistaken for software defects.
Quality RS-232 work is reproducible, documented and tested under normal and fault conditions. The deliverable should explain wiring, settings, message interpretation, timeout behavior and recovery steps. A strong professional also distinguishes electrical problems from protocol or application problems instead of treating every failure as a coding issue.
RS-232 may be a poor choice when many devices must share one network, when cable distances are substantial, or when the environment creates significant electrical interference. It is also less suitable when the system needs modern network access, strong remote management or high throughput. In those cases, RS-485, Ethernet or another interface may be more appropriate.
The average hourly rate of freelancers in Germany who have used RS-232 in their recent projects is 93 €, which corresponds to a daily rate of about 742 € based on an 8-hour working day.
Of the freelancers in Germany who have used RS-232 in their recent projects, 81% hold at least a Bachelor's degree, 50% hold at least a Master's degree, and 13% hold a doctorate.
On average, freelancers in Germany who have used RS-232 in their recent projects have 27 years of professional experience, with a single engagement typically lasting around 3.9 years.
The most common languages among freelancers in Germany who have used RS-232 in their recent projects are German (100%), English (100%), and French (21%).
The most common industries among freelancers in Germany who have used RS-232 in their recent projects are Information Technology (85%), Manufacturing (85%), and Automotive (69%).
The most common business areas among freelancers in Germany who have used RS-232 in their recent projects are Information Technology (100%), Product Development (100%), and Quality Assurance (90%).
Main locations of FRATCH Experts, who have recently used RS-232
Our freelancers and interim experts are at home across the DACH region — available on-site in the major business hubs or fully remote. Choose a location to discover matched specialists, local market insights and up-to-date availability.
Berlin Hamburg Munich Cologne Frankfurt Stuttgart Dusseldorf Leipzig Dortmund Essen Bremen Dresden Hanover Nuremberg 
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