{"product_id":"black-box-me800a-async-short-haul-modem","title":"Black Box ME800A Async Short Haul Modem","description":"\u003cdiv\u003e\u003cp\u003eThe Black Box ME800A-R4 Async Short-Haul Modem is a rugged, standalone RS-232 modem designed to carry asynchronous serial data over CATx copper cabling by pairing two units to create a full-duplex link up to four miles apart. It is the 4-wire, RS-232 Short-Haul Modem‑C Async variant and uses a DB9 RS‑232 interface on the modem side, with 24 external mini DIP switches to support a wide range of line rates, parity, and handshaking options. Front-panel indicators consist of two dual LED groups (red\/green) that show transmit\/receive status and verify twisted-pair polarity, helping installers diagnose wiring and operation quickly. The ME800A‑R4 is offered as a standalone unit or in SHM‑B Async rackmount form, is TA A compliant, and is commonly deployed in point‑of‑sale, industrial, and security applications where extending serial interfaces over CATx cables is advantageous for connecting serial devices across longer copper runs.\u003c\/p\u003e\u003c\/div\u003e","brand":"Black","offers":[{"title":"Used Surplus - Excellent Condition","offer_id":51677084844334,"sku":null,"price":90.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0818\/1038\/files\/Ebay_website_image_733bbde1-6621-4e08-b042-573b63603233.jpg?v=1769557570","url":"https:\/\/plgautomation.com\/products\/black-box-me800a-async-short-haul-modem","provider":"PLG Automation ","version":"1.0","type":"link"}