{"product_id":"black-box-md640a-st-r2-multimode-fom-fiber-modem","title":"Black Box MD640A-ST-R2 Multimode FOM Fiber Modem","description":"\u003cdiv\u003e\u003cp\u003eThe Black Box MD640A-ST-R2 Multimode FOM Fiber Modem is a compact RS-232 fiber-optic modem designed for point-to-point serial links over a single 62.5-µm multimode fiber. The fiber interface on this ST-series model uses an ST multimode connector and pairs with standard bulk multimode fiber assemblies such as EFN1004 or EFN1006. On the RS-232 side, the device connects to DCE equipment with a cross-pinned RS-232 cable of the null-modem type, enabling direct extension of RS-232 signals over fiber without electrical interference on the link. Powered from 120 V AC, this modem is part of Black Box’s MultiMode Fiber Optic Modem (FOM) family and is designed for short-range optical transmission, suitable for laboratory, automation, and instrumentation environments where a simple, reliable fiber link is preferred for RS-232 communication. \u003c\/p\u003e\u003c\/div\u003e","brand":"Black","offers":[{"title":"New","offer_id":51677085204782,"sku":null,"price":54.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0818\/1038\/files\/Ebay_website_image_4e82e071-c68d-4a01-bd50-d0c3e2164700.jpg?v=1769557576","url":"https:\/\/plgautomation.com\/products\/black-box-md640a-st-r2-multimode-fom-fiber-modem","provider":"PLG Automation ","version":"1.0","type":"link"}