It is used primarily for broadcasting messages over a network. In medical imaging, UDP is used to log information from various devices to a system logging repository. A datagram is a piece of a message transmitted over a packet-switching network, and is a packet of information that contains the destination address in addition to data. • Channel 1: GPCLK/UART—This channel can be used as a general purpose clock (GPCLK) or universal asynchronous receiver-transmitter (UART). See Channel 3 for a more