One Box. Four Links — CAN FD, LIN, Fiber & Ethernet.
OpticBridge 4-in-1 (model OB4-100) is a single DIN-rail transceiver that converts CAN FD to Fiber Optic, CAN FD to Ethernet, LIN to Fiber Optic, and LIN to Ethernet — transparently, with galvanic isolation, and without changing your protocol stack. Engineered by Embed Square for EMC labs, EV test benches, and long-distance industrial fieldbus links.
4
Link Types
In one DIN-rail housing
8 Mbit/s
CAN FD Data-Phase
Software-selectable bit rate
2 km
Multimode Fiber Reach
Up to 20 km on single-mode variant
14–38V
DC Power Input
Reverse-polarity protected
The Protocol Matrix
Four Conversions, One Spare Part
Whatever mix of copper and optical media your CAN FD and LIN networks need, this unit carries the frames through — bidirectionally, in real time, and all four paths at once.
Path 01
CAN FD → Fiber Optic
Full-speed media conversion between a copper CAN FD bus and a duplex multimode fiber link. Transparent forwarding of classic and FD frames, extended IDs, and remote frames.
Path 02
CAN FD → Ethernet
CAN FD and classic CAN frames wrapped into TCP or UDP datagrams for PC tools and host applications — a diagnostic-grade link over any IP network.
Path 03
LIN → Fiber Optic
Single-wire LIN buses carried over optical fiber to escape ground loops and reach far test stations. Master or slave role, LIN 1.3 / 2.x aware.
Path 04
LIN → Ethernet
LIN frames streamed over TCP/UDP so bench hardware, gateways, and test supervisors can watch LIN schedules from anywhere on the network.
All four paths run concurrently on one unit. Frame routing is transparent — no changes to CANopen, J1939, UDS, or plain custom protocols.
Inside the Box
Engineered for the Test Bench and the Plant Floor
Every decision — optics, isolation, power, housing — is aimed at one job: carrying CAN FD and LIN traffic reliably where copper cannot go.
Routing
Transparent Frame Routing
CANopen, J1939, UDS, or your own protocol — frames pass through in both directions at full line rate, with no firmware changes in your stack.
Isolation
Galvanic Isolation
A hard barrier between the field and media side kills ground loops and protects test gear — the fiber path is isolated by its very nature.
Setup
Web Configuration, No Software
Set bit rates, termination, LIN master/slave role, and IP addressing from any browser. One config file per unit, easily cloned.
Power
14–38V DC Wide-Range Input
A single supply handles automotive-style 12V rails, 24V industrial rails, and 36V battery strings — reverse-polarity protected.
Build
Metal Housing, DIN-Rail Ready
Shielded metal enclosure for panel or DIN-rail mounting — one 24V feed instead of four separate converters and supplies.
Diagnostics
Lab-Friendly Bring-Up
SWD debug port and a debug UART log, plus live LEDs for PWR, CAN, LIN, FO, and link — fault-finding in seconds, not hours.
Product Overview
Copper In. Fiber and IP Out.
One STM32H (ARM Cortex-M7) core routes frames between a copper field side and an isolated media side — with a galvanic barrier that kills ground loops. One CAN FD bus (ISO 11898-2) with switchable 120Ω termination and one LIN bus (master or slave) connect on plug-in terminals, powered by a 14–38V DC input from any lab or industrial rail.
On the media side, a duplex multimode fiber port (SC, 850nm) and a 10/100BASE-T Ethernet port (RJ45) carry the frames onward. The fiber link is inherently galvanically isolated; the Ethernet path is transformer-isolated — so equipment on either side never shares an electrical ground.
Frames pass through at line rate in both directions with zero protocol changes to CANopen, J1939, UDS, or your own stack — the unit is a drop-in media converter, not a translator your existing tools need to learn about.
Field Side → Media Side
Signal path at a glance
Technical Specifications
Full Datasheet, Condensed
Model OB4-100 · Version P2.0. Six functional blocks — system core, CAN FD, LIN, Ethernet, fiber optic, and power/environment.
System Core
STM32H · ARM Cortex-M7
32-bit processor handles transparent CAN 2.0A/B + CAN FD (ISO 11898-1) and LIN 1.3/2.x frame routing, with SWD debug and a debug UART for bring-up.
CAN FD
ISO 11898-2 Interface
10 kbit/s – 1 Mbit/s arbitration, up to 8 Mbit/s data-phase, switchable 120Ω termination, classic + FD frame support with extended ID.
LIN
LIN 1.3 / 2.0 / 2.1 / 2.2
Single-wire 12V bus, 1–20 kbit/s configurable, switchable master (schedule table) or slave role.
Ethernet
10/100BASE-T(X) · RJ45
Auto-negotiation, auto-MDI/X, raw CAN/LIN frame streaming over TCP client/server and UDP, transformer-isolated.
Fiber Optic
Duplex Multimode / Single-Mode
850nm VCSEL, SC duplex connector (ST on request), 50/125µm or 62.5/125µm multimode fiber, inherently galvanically isolated.
Power & Env.
24V DC · 500V Isolation
14–38V DC wide-range input, <5W consumption, 500V DC galvanic isolation field/media, 0–50°C operating, metal DIN-rail housing.
Applications
Where Copper Runs Out, This Box Takes Over
EMC / EMI Laboratories
Run CAN FD and LIN buses through immunity and emission tests with optical separation — no ground loops, no conducted noise into the DUT.
EV & Battery Test Benches
High-voltage inverter and battery rigs keep the bus far from the operator desk — fiber crosses the cell, Ethernet reaches the PC.
Long-Distance Fieldbus
Well past the ~40m copper limit, fiber carries CAN FD and LIN over extended distances without repeaters and with zero noise pickup.
Industrial Automation
Machine controllers, solar and wind plants, process lines — anywhere potential differences and EMI threaten copper buses.
Vehicle & Lab Integration
Plug bench LIN slaves or CAN FD prototypes into an Ethernet-based data-acquisition backbone and monitor with standard tools.
Test-Equipment OEMs
Embed one gateway inside testers and fixtures to offer fiber and Ethernet bus access as a standard feature — no separate converter boards.
Ordering Information
Part Numbers & Accessories
Model OB4-100 · Version P2.0, available in three fiber configurations plus DIN-rail power and patch cord accessories.
OB4-100-01Multimode fiber · SC duplex · 24V DCOB4-100-02Multimode fiber · ST duplex · 24V DCOB4-100-03Single-mode fiber · up to 20 km · SC duplexOB4-ACC-PS24Accessory — 24V DC DIN-rail power supplyOB4-ACC-PCAccessory — multimode duplex patch cord, 2 mFAQ
Common Questions
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Order a sample unit, or ask for the validated datasheet, outline drawing, and pricing. Our engineers will respond within 24 hours.