html{display:none} SEL-2894 Interface Converter | Schweitzer Engineering Laboratories


Interface Converter

Transfer SEL Mirrored Bits communications via an IEEE C37.94 fiber-optic link through a communications multiplexer. Or, convert other EIA-232 serial links to IEEE C37.94 optical fiber links for improved safety, signal integrity, and longer distances.

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EIA-232 to Fiber-Optic Interface—Interface asynchronous EIA-232 devices with synchronous networks through IEEE C37.94 compliant multiplexers or transfer switches. The IEEE C37.94 standard provides plug-and-play transparent communications between different manufacturers' teleprotection and multiplexer devices. The SEL-2894 uses 850 nm wavelength optics.

SEL Mirrored Bits Communications—Connect the SEL-2894 to any relay with Mirrored Bits communications, and transport at data rates from 300 to 19200 bps with less than 375 µs delay, back-to-back.

Safety and Security—Install fiber-optic connections to isolate communications from ground potential rise and electrical interference.


    1. 1

      EIA-232 Connection

    2. 2

      LED Indicators

    3. 3

      IEEE C37.94 Fiber-Optic Connection



High-Speed Communications
The SEL-2894 has very low latency adding only 375 µs of through delay back-to-back. It works with EIA-232 signals from 300 bps to 19,200 bps.

Three LED Indicators
TX and RX green LEDs show incoming and outgoing fiber-optic states. A standard yellow alarm LED indicates a transmission problem.

Selectable Time Reference
A side-selector switch on the SEL-2894 configures the internal clock for either external or internal time reference.

Flexible Power Supply
The converter connects directly to a standard 9-pin serial port and receives power directly on Pin 1 so no external power is required when used with SEL relays. The converter can also receive power from an external supply when connected to other devices.

Mounting Kits

Use an SEL Transceiver Mounting Kit and adapter cable when connecting the transceiver to IEDs with an RJ-45 male serial connector or when the mounting depth is an issue (e.g., in switchgear applications). The following kits provide a simple and secure way to remote-mount the transceiver away from the host connector:

The Firmware IDs for older versions of the firmware can typically be found in Appendix A of the instruction manual.

Instruction Manuals

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