UART

(you art) abbr. Universal Asynchronous Receiver Transmitter.

uClinux

(you see Linux) n. A variant of the popular Linux kernel designed for use in systems without an MMU. A trademark of Lineo. Despite the absence of an MMU, uClinux provides complete and stable support for multitasking, along with a TCP/IP stack, support for popular filesystems such as ext2, NFS, and FAT, and the familiar Linux API. It has been used successfully in commercial products.

Further Reading: http://www.uclinux.org

UDM

(as letters) abbr. See Universal Design Methodology.

UDP

(as letters) abbr. A connectionless transport layer protocol. Short for User Datagram Protocol. RFC 768. Network packets sent via UDP cannot be larger than the MTU, can get lost in transmission, and could arrive out of order. If your application needs any of these things and can t work around these problems easily, use TCP instead.

UDP port

n. A numeric identifier for a UDP endpoint on a particular network node. To reach a particular device, each UDP datagram must be addressed to a valid IP address and port number. If no thread is listening on that particular port, the datagram will be discarded by the receiver s UDP/IP stack. See also socket, well-known port numbers.

UDP/IP

(as letters) abbr. A variant of a TCP/IP stack that supports only the UDP protocol at the transport layer. TCP and UDP are peer protocols, in that they both operate at the same OSI layer and both run on top of IP. In many networked embedded systems, TCP s costs...