html{display:none} SEL-2820 Multimode Fiber-Optic EIA-485 Transceivers | Schweitzer Engineering Laboratories


Multimode Fiber-Optic EIA-485 Transceivers

Safely add isolated segments to multidrop and point-to-point EIA-485 networks, separated by up to 500 meters. Improve safety, signal integrity, and reliability by using two optical fibers instead of wire to transfer bidirectional serial data.

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Fiber-Optic Link to EIA-485—Connect to two- or four-wire EIA-485 network segments with SEL-2820 Fiber-Optic V-Pin Transceivers and an SEL-C805 Multimode Fiber-Optic Cable. The SEL-2820 uses a V-pin connector, is compatible with SEL-2800 Fiber-Optic Transceivers, and supports a link distance of 1 to 500 m (3.3 to 1640 ft).

Fast Data Rates—Transfer data at rates up to 40 kbps with the SEL-2820.

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


Increases Safety
Isolates devices from ground potential rise and fault current in the communications connections by using optical fiber instead of wire.

Improves Signal Integrity
Prevents electromagnetic interference and signal ground loops by using optical connections instead of copper wires.

Withstands Harsh Conditions
Operates over –40° to +85°C temperature range and meets or surpasses electric utility and industrial type-test standards for instrumentation, control, and communications equipment.

Easily Applied
Implements fiber-optic links between two- and four-wire EIA-485 network segments. Set operating modes via control (DIP) switches. Simplifies network commissioning and repair with LED traffic indicators for each port. Connect power through terminal block or jack.

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

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