Bring one serial device onto the Ethernet backbone without replacing equipment that still performs well. The Advantech EKI-1521-CE is designed for teams that need dependable access to a single legacy asset through a network connection, with support for RS-232, RS-422, and RS-485 interfaces. Fast Ethernet gives the device server a straightforward place in existing infrastructure, while the wall-mountable design helps it fit into cabinets, utility spaces, and distributed edge locations. For organizations managing a mix of older serial hardware and modern network operations, that simplicity matters: fewer adapters, fewer workarounds, and a cleaner path to remote access. This model is a focused choice for one-device deployments where reliability and compatibility matter more than excess port count. It is well suited to control systems, instrumentation, and other serial endpoints that need to remain in service while becoming easier to reach, monitor, and support across the network.