Clock is applicable in schools, churches, museums, theaters, and boardrooms. It is set and controlled via RS232 communications. It can receive serial data input from computers or other controllers, for setting time, elapsed time, and/or displaying short messages such as fire and bell. Up to 50 clocks can be connected to a standard RS232 port at distances of up to 2000ft away. Signal drivers are available for adding additional clocks and greater distances.