Video Disk Control Protocol (VDCP) is a proprietary communications protocol primarily used in broadcast automation to control hard disk video servers for broadcast television.
At the time it was developed, Hewlett Packard (whose broadcast server division was eventually sold to Pinnacle Systems) and Tektronix were both bringing to market the first of the VideoFile Servers to be used in the broadcast industry.
VDCP conforms to the Open Systems Interconnection (OSI) reference model.
VDCP is a serial communications protocol based on RS-422.
Full details of the protocol are available from Imagine Communications who, as Harris Broadcast, acquired Louth in 2000.