In addition to an ANTCOM, each antenna has a Servo Control Computer (SCC) which is responsible for controlling the motion of the antenna. The SCC accepts movement commands, position information etc. from the ANTCOM, checks that the command is sensible, and if so obeys it. It also returns the antenna status information periodically through the same link. This information is passed on by the ABC to ONLINE and is displayed on a monitor in the CEB.