Business Details
30 Years
experience
Automotive Diagnostic Interface Hardware
Multiplex Engineering is a technology company specializing in serial databus standards for the automotive industry. Since 1996, we have designed and manufactured diagnostic interface hardware essential for building OBDII scan tools. Our interfaces support protocols including SAE-J1850 VPW, ISO-9141-2, and CAN, with over 200,000 units shipped globally. We focus exclusively on hardware solutions, requiring customers to develop or provide their own software. Our engineering team, led by President Paul Bowena 30+ year veteran in digital electronics and former Delco Systems engineeroffers expertise in microprocessors, programmable logic, and digital communications.We provide technical support for custom design projects and maintain rigorous quality standards in all products. Our facility in Goleta, California, serves as the hub for innovation and customer collaboration. We prioritize transparency, ensuring clients understand the technical requirements and limitations of our hardware. With decades of combined experience, our team remains committed to advancing automotive diagnostic technology. Our reputation for precision and reliability has made us a trusted partner in the industry.
Services
Diagnostic Interfaces
OBDII Connectors
DB9 Cables
Interface Testers
Custom Hardware Design
Details
- Year established: 1996
Highlights and features
- We have shipped over 200,000 diagnostic interfaces since 1996.
- Our President has 30+ years of digital electronics engineering experience.
- We offer transparent technical specifications with no hidden software dependencies.
- Our hardware supports all major automotive communication protocols.
- We provide direct engineering support for custom design projects.
Services
Diagnostic Interfaces
Our diagnostic interfaces support automotive protocols like CAN, ISO, and SAE-J1850. These hardware solutions enable engineers to develop custom scan tools without proprietary software dependencies. Each unit ships with technical documentation for integration.
Interface Testers
Interface testers validate communication protocols in automotive systems. Designed for comprehensive diagnostics, these tools include test software to verify signal integrity and protocol compliance during development and quality assurance.
DB9 Cables
Custom-length DB9 cables connect diagnostic hardware to vehicle systems. Available in multiple configurations, these cables ensure reliable data transmission between interfaces and OBDII ports in various automotive applications.
OBDII Connectors
Durable OBDII connectors provide secure links between diagnostic tools and vehicle ECUs. Available in male and female configurations, these components meet industry standards for pin alignment and electrical conductivity.
Custom Design
We offer tailored hardware solutions for specialized automotive diagnostic needs. Our engineering team collaborates directly with clients to develop interfaces meeting unique protocol requirements or form factor constraints.
People
Paul Bowen
President and Chief Engineer
Paul Bowen has designed digital electronics since 1983. He earned an M.S. in Electrical Engineering from UC Santa Barbara and worked at Delco Systems for 13 years. His expertise includes microprocessors and automotive communication protocols.
Questions
Do your interfaces work with commercial diagnostic software?
No, our interfaces require custom-developed software and do not integrate with commercial diagnostic programs.
What protocols do your interfaces support?
Our hardware supports CAN, ISO-9141-2, SAE-J1850 VPW/PWM, and KWP2000 protocols for automotive diagnostics.
Can I purchase software from Multiplex Engineering?
We only sell hardware. Customers must develop or source their own software for our diagnostic interfaces.
Are your products compatible with standard OBDII scan tools?
Our interfaces require custom integration and are not designed for direct compatibility with existing scan tools.
Do you offer technical support for product integration?
Yes, our engineering team provides technical assistance for hardware-software integration and troubleshooting.
What is the warranty period for your interfaces?
We offer a 1-year limited warranty covering manufacturing defects in our diagnostic hardware products.
