... . MA20A01 is in 19” 3U structure, with maximum installation of 13 pieces of business inserting boards, 2 pieces ... RS485 port outward. 2. Equipment featuresLow cost, simple use, installation, maintenance and management, plug and play;Support point-to- ... ;The structure is flexible and light, with brief and quick installation. 3. Specifications Product model SpecificationsMA20A 2M Port Protection and ...