SEL-2812 Fiber-Optic Transceiver/Modem With
IRIG-B
Improve safety, signal integrity, and reliability by using two optical fibers instead of wire to transfer bidirectional serial data plus an IRIG-B time synchronization signal. Apply for instrumentation, protection, automation and other applications that benefit from economical fiber-optic links up to 4 kilometers long.
- Transfer Data Plus Time Synchronization Economically
Use data rates up to 115.2 kbps for a full duplex serial link with up to 4 kilometers of multimode optical fiber. Use the same transceivers/modems and fibers to simultaneously transfer simplex IRIG-B time code. - Apply Easily
Plug transceiver/modem directly onto a standard 9-pin serial connector (DB-9). No special mounting is required. Receives power from the host device via the connector; no separate power supply or power wiring is needed. Uses popular ST® connectors. Requires no jumpers or settings. - Improve Communications Reliability
Apply in harsh electrical and physical environments. Far less susceptible to EMI/RFI than copper links, with a maximum Bit Error Rate of 10-9. - Improved Safety
Provides improved isolation from ground potential rise and other electrical hazards compared to copper connections. Eye-safe Class 1 Laser Product.
- SEL Communications Processors and Relays
Use an SEL-2812MT for each IED port on an SEL-2032/2030/2032 Communications Processor. Use a duplex fiber-optic cable to connect each SEL-2812MT to an SEL-2812MR, mounted on each relay, lower-tier communications processor, or logic processor. If needed, connect the appropriate adapter cable between the IRIG-B jack on the SEL-2810MR and the IRIG-B input for the remote device. The SEL-2032/2030/2020 communicates with interleaved ASCII and binary messages over the full-duplex serial link, using the same fibers that are also synchronizing the device clocks with simplex IRIG-B signals. - SEL-2100 Logic Processor and Relays
Connect SEL-2812MT Fiber-Optic Transceivers/Modems to the serial ports of a relay and an SEL-2100 Logic Processor. Use Mirrored Bits® communications for high-speed exchange of protection information. Coordinate protection between generating plants and associated switchyards or between multiple control houses in the same station. Transfer to backup protection based on loss of potential or failures detected by diagnostics. Keep the dc circuits segregated between cabinets. Provide directional element-based bus protection. - Other Devices
Connect an SEL-2812MT or SEL-2812FT Fiber-Optic Transceiver/Modem to the serial port of a master device. Connect an IRIG-B source to the input jack on the SEL-2812. On the remote device, use the appropriate SEL-2812MR or SEL-2812FR, and a cable from jack J1 to the IRIG-B input on the remote device.
IRIG-B Adapter Cables
- C654 Mono Plug to BNC
- C655 Mono Plug to DB-9
- C656 Mono Plug to Ring Terminals
Fiber-Optic Cables and Jumpers
- For limited space, use C780 cable
These devices can communicate with SEL-2812 Models when connected through fiber-optic cables::
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SEL-2812 Model
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Fiber Compatible Device (option)
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Fibers
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IRIG-B
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MT or FT
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SEL-9220 Fiber-Optic Adapter or SEL-2812MR or FR
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2
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Yes
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MR or FR
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SEL-9220 Fiber-Optic Adapter or SEL-2812MR or FR
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2
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No
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Any
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SEL-2814
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2
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No
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Any
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SEL-2600 RTD Module (SEL-2812 Compatible)
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1
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No
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Any
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SEL-2664 Field Ground Module
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1
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No
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MT or FT
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SEL-700 Series Relays (Fiber-Optic Port)
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2
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Yes
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MR or FR
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SEL-700 Series Relays (Fiber-Optic Port)
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2
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No
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MR or FR
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SEL-2407
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2
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Yes
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MT or FT
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SEL-2407
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2
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No
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MT or FT
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SEL-2411, -2414, 2431, 2440 (Fiber-Optic Port)
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2
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Yes
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MR or FR
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SEL-2411, -2414, 2431, 2440 (Fiber-Optic Port)
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2
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No
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Any
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SEL-2505, -2515 Remote I/O Modules (SEL-2812 Compatible)
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2
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No
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