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Compact metal box with DIN rail clips, ST duplex port and RS-232/485 terminals

Black Box Corporation

Black Box Corporation MED100A RS-232/RS-485 to Fiber SFP Transceiver

SKU CH-C380-9TCW1 MPN MED100A

Converts RS-232/RS-485 signals to fiber with a duplex ST port reaching 2.49 miles in a rail-mountable unit

  • Device TypeTransceiver
  • Max Distance2.49 Mile
  • Power AdapterRail-mountable
  • Weight0.43
  • Converts RS-232/RS-485 signals to fiber for 2.49 mile reach
  • Single ST duplex port handles multi-mode optical fiber links
  • DIN rail mountable design fits 2.3 by 4.3 inch industrial enclosures
  • Lightweight 0.43 lb unit simplifies cabinet installation
  • TAA compliant and WEEE RoHS certified for regulated projects

Product Identity

The Black Box MED100A is a rail-mountable transceiver that converts serial RS-232 and RS-485 signals to optical fiber. It is built for industrial automation engineers who need to extend copper links over longer runs in electrically noisy environments.

Critical Specification

The single multimode ST duplex port supports a maximum distance of 2.49 mile, which determines whether the link budget fits your plant layout. Exceeding this range will cause signal loss, so verify the exact cable length before ordering.

Installation Notes

The unit clips onto a standard DIN rail and draws power from a DC source, so no separate wall adapter is required. Allow 2.3 inches of width and 4.3 inches of depth inside the cabinet. The most common issue is reversing the Tx and Rx fibers on the duplex connector, which stops all traffic until corrected.

Highlights

  • Converts RS-232/RS-485 signals to fiber for 2.49 mile reach
  • Single ST duplex port handles multi-mode optical fiber links
  • DIN rail mountable design fits 2.3 by 4.3 inch industrial enclosures
  • Lightweight 0.43 lb unit simplifies cabinet installation
  • TAA compliant and WEEE RoHS certified for regulated projects

Specifications

BrandBlack Box
Device TypeTransceiver
Max Distance2.49 Mile
Power AdapterRail-mountable
Weight0.43
Shipping weight0.24 kg
Package size127 × 76 × 25 mm

Questions about this item

How far will the 2.49 Mile reach hold up when the transceiver is installed in a live network?

The 2.49 Mile maximum distance is rated for multi-mode fiber with duplex ST connectors and applies to the RS-232/RS-485 serial link under standard attenuation.

What does the RS-232/RS-485 interface cap in actual throughput?

The serial interface is limited by the RS-232 and RS-485 electrical standards themselves; the transceiver adds no extra protocol overhead beyond converting the signal to optical fiber.

What clearance does the 1" by 2.3" by 4.3" rail-mountable chassis need inside a cabinet?

Allow at least 1 inch height, 2.3 inches width and 4.3 inches depth on a standard DIN rail, plus space for the ST fiber connector and the DC power feed.

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