It communicates at 12 mbps via an available USB 1.0/2.0 port on an OCM, DCM or CDCM. The D/3 Keyboard contains an audible alarm horn with an adjustable volume control and an alarm relay consisting of a single set of Form C contacts. D/3 control and display functions can be protected by limiting access to them. To access a protected function, the user must have either a master key to operate the key lock in the D/3 Keyboard or a password and a Console-Enabling Index, CEI. The master key bypasses