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CAN Bus To Fiber Optics Converter For Electrical Isolation And EMI/RFI Immunity

Posted by Industry News on

S.I. Tech Model 2149 Fiber-optic converter for CAN Bus

S.I. Tech (USA) introduced its Model 2149R CAN Bus to Fiber Repeater, a component that converts electrical CAN Bus signals to optical signals. The maximum data transfer speed on the electrical side is 1 Mbit/s.

The use of fiber-optic converters allows for effective electrical isolation between the attached devices, protecting them from electrical surges, and providing EMI/RFI (electromagnetic interference/radio frequency interference) immunity. Fiber-optic lines also support longer distances between network nodes. The units enable a distance capability of up to 2 km / 1.25 miles (multi‑mode) and up to 10 km / 7.5 miles (single-mode). The 2149R Model supports standard CAN Bus bit‑rates from 125 kbit/sec to 1 Mbit/sec. The CAN Bus ports use 120‑Ohm termination resistors.

The metal-enclosure device measures 10 cm x 9 cm x 2.5 cm (4" x 3.5" x 1") and it comes with DIN-rail mounting. Status indicators are available for the Tx, the Rx, and the power signals. There are options to extend the standard operating temperature range from 0 °C to +70 °C. The options for an external power supply include 24 VDC, 110 VAC, or 230 VAC.

S.I. Tech develops and markets fiber optics systems. The company founder formerly managed Belden Corporation's venture development in fiber optic systems, including fiber optic cables, transmitters, receivers, modems, multiplexers, and link developments. S.I. Tech acquired the fiber optic systems division of Belden Corporation in 1984.


  • Asynchronous, CAN Bus protocol
  • 6600 ft. (2Km) maximum distance capability
  • 0°C to 70°C operating range
  • ST connector receptacle
  • Data Speed: 1 Kbps to 125 Kbps
  • ISO 11898 Specifications
  • Use 120 Ohm termination at both ends of network
  • Din Rail Mounting
  • Status Indicators - Tx, Rx, and Power

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Isolated CAN FD Breakout Board

Isolated CAN FD Breakout Board

The breakout board represents an isolated CAN Bus module with Flexible Data Rate using the Analog Devices ADM3055E IC with a data rate of up to 12 Mbps. 

Protecting a network against this destructive energy requires the galvanic isolation of the CAN bus system from other local node circuitry.

The output pins are on both screw terminals and a DB9 connector. The DB9 connector can be configured for use with an OBDII cable, SAE J1939 cable, or CAN Analyser pin-out via solder bridges.

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