Black Box MED101A

Overview

The Black Box MED101A is an industrial fiber extender designed to connect RS232, RS422, and RS485 serial devices over multimode fiber optic cables. It enables stable and secure data communication in environments prone to electrical noise and interference, such as industrial plants and areas near heavy machinery. Supporting RS-232 speeds up to 115.2 kbps and RS-422/RS-485 speeds up to 460.8 kbps, this extender ensures reliable transmission over distances up to 2.5 miles (4 km).

Key features

• Extends serial communication protocols RS232, RS422, and RS485 over multimode fiber to eliminate electromagnetic interference.
• Supports Modbus ASCII and RTU protocols, making it compatible with common industrial automation systems.
• Automatic Send Data Control simplifies installation by removing the need for additional driver software.
• Removable terminal blocks provide flexible wiring options for easy integration into existing setups.
• DIN rail mounting capability allows neat installation within control cabinets or equipment racks.
• Operates reliably in extreme temperatures ranging from -40°F to 185°F, suitable for harsh industrial environments.
• Three-way isolation with 2000-V input/output protection enhances durability and safeguards connected equipment.

Key specs

• Supported protocols: RS232, RS422, RS485
• Data rates: RS-232 up to 115.2 kbps; RS-422/RS-485 up to 460.8 kbps
• Communication distance: up to 2.5 miles (4 km) over multimode fiber
• Operating temperature range: -40°F to 185°F
• Input/output isolation: 2000 V three-way isolation
• Mounting: DIN rail compatible

Connectivity and compatibility

This extender connects serial devices using removable terminal blocks, which support RS232, RS422, and RS485 interfaces. It converts these serial signals to fiber optic transmission, protecting data from electromagnetic interference common in industrial settings. Compatibility with Modbus ASCII and RTU protocols ensures it works seamlessly with many industrial control systems and automation equipment.

Installation and setup

Installation is straightforward with removable terminal blocks that simplify wiring and a DIN rail mounting option that fits standard industrial racks and cabinets. The Automatic Send Data Control feature eliminates the need for driver software, reducing setup time and complexity. This makes the MED101A a practical choice for engineers and technicians who need quick and reliable serial communication extension.

Ideal uses and environments

The MED101A is well suited to industrial automation, manufacturing plants, and any environment where long-distance serial communication must be free from electrical noise and interference. Its rugged design and wide operating temperature range make it a strong choice for harsh conditions, including outdoor installations or areas near heavy machinery. It is particularly valuable for professionals who require stable data transmission over extended distances without signal degradation.

Orders are processed within 2 business days, which includes verification, packing, and dispatch. Shipping costs are calculated at checkout based on destination, total weight, and selected speed. Free shipping applies to carts over $100 (excluding heavyweight items). All available options and final pricing are clearly shown before payment so you can choose the service that best fits your needs.

Deliveries are handled by major carriers such as USPS, UPS, and FedEx. Estimated delivery times are displayed at checkout and may vary depending on service level and location. Please note that these are estimates and can be affected by weather, holidays, or carrier volume. Once your order ships, you’ll receive a tracking number for real-time updates from pickup to final delivery.

Providing an accurate shipping address helps prevent delays, and changes may be limited once the order has been dispatched. P.O. boxes are supported only when permitted by the selected carrier. Packaging and handoff are optimized to protect items during transit, though oversized or high-weight products may require special handling. All shipping methods and any related constraints are clearly shown during checkout.

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Returns are accepted within 30 days of delivery. Items must be unused, in the same condition received, and include all tags, manuals, accessories, and original, unaltered packaging. To start a return, please email us for approval. Items sent back without approval may be refused or returned to the sender. If any item is kept, its value will be deducted from the refund.

Non-returnable items include opened TVs, combos, or monitors 37″ or larger, opened computers or software, electronic downloads, opened consumables (film, paper, bulbs, media, ink), custom or modified computers, special-order or “nonreturnable” items, submerged underwater gear, and opened educational media.

After inspection, refunds are issued to the original payment method. Please allow 5–7 business days for the credit to post. Shipping and handling are nonrefundable. If an item is used, incomplete, or not in its original condition, a 30% restocking fee may apply. Direct exchanges are not offered. To exchange an item, please purchase the replacement separately and return the original for a refund.

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We act solely as a reseller. Any product warranty is provided and administered by the manufacturer, not by our store. That means eligibility, coverage, and outcomes are determined by the manufacturer’s policy for each brand and model. Before purchasing, we recommend reviewing the warranty terms on the manufacturer’s website or in the product documentation to confirm what is covered and for how long.

If you need warranty service, please file the claim directly with the manufacturer. They may require proof of purchase, the product serial number, original packaging, photos, or basic troubleshooting. Some brands ask you to register the product or obtain a case number before shipping it for repair or replacement. We don’t submit or approve claims, but we can point you to the correct support links and contact details.

Keep your invoice and packaging in a safe place, and report any functional issues to the manufacturer as soon as they appear. If you’re unsure whether a problem is covered, the manufacturer’s support team can confirm next steps and timelines. While we cannot intervene in decisions or outcomes, we’re happy to provide purchase documentation or guidance so you can move through the warranty process smoothly.

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