Sony 930 Camera Command Network Units CNU-700 and CNU-500, Character display, Emergency feature

4 4-3.Camera Command Network Units – CNU-700 and CNU-500

The CNU-700 and CNU-500 Camera Command Network Units are designed as the technical 'nerve center' of a Star Shape Network System where all commands such as 'All', 'Control Priority', 'Parallel/ Mode', etc. are centralized and distributed to the respective HDCUs of the studio system. They are furnished with an RS-232C port to provide interface capability to external systems such as ISR (Interactive Status Reporting), external PC or modem and robotics control systems. They can be mounted in a 19-inch standard rack (3U height for the CNU-700, and 1U height for the CNU-500). Through the modem or PC, camera data files can be transferred from a master camera in a studio to cameras at several remote sites during a live broadcast.

By employing a RISC-based microprocessor in the CNU-700 and CNU-500, the communication speed has been greatly improved. Consequently, real-time control and instant response to the MSU-700A/750 or RCP-700 Series commands have been made possible. With the combination of one VCS-700 Video Selector with a CNU-700 or CNU-500, each of six pictures and six waveform monitoring video signals can be handled (and expanded to 96 of each with eight CNU-700 units).

Through a CNU-700 or CNU-500, one RCP can control one HDCU while one MSU is able to control multiple HDCUs. All units connected to the CNU can easily communicate with each other. Because of this useful new -function, simultaneous control of multi cameras, file transfer between multi cameras and control from an external device are now possible.

As a convenient tool for system set-up and maintenance, both MSU control routing and CNU control assignment can be displayed on a monitor.

Since the CNU is the nerve center of a system, it has a bypass facility to maintain communication between the HDCUs and RCPs in the event of a CNU malfunction or power loss. Therefore, even when the power unit or AT board of the CNU-700 or CNU-500 has failed, camera heads and HDCUs can be directly controlled from the RCPs to let program production

Table 4-1: A comparison between the CNU-700 and CNU-500

continue.

As mentioned in Section 2, Total System, the cost versus performance balance between the two types of Camera Command Network Units allows users to build up systems that meet their application needs. The CNU-500 is suitable for applications with up to six cameras, while the CNU-700 can be expanded to handle up to 12 cameras with use of the BKP-7930 optional expansion board.

(1)High-speed data transmission rates CNU to MSU/RCP/HDCU: More than 500 Kbps Camera Head to HDCU: 35 Kbps

(2)System configuration

Basic system: Up to six cameras with one CNU-700 or CNU-500

Expanded system: Up to 12 cameras with one CNU- 700 with one BKP-7930 optional board installed Maximum system: Up to 96 cameras with eight CNU- 700 units (each with a BKP-7930 optional board installed) via I/O port on the rear panel (four MSU-

700A/750 Master Set-up Units required).

(3) Character display

Information concerning the camera heads and HDCUs connected to the CNU-700 and CNU-500 can be displayed on a monitor via the CHARACTER connector. This includes:

•Camera settings

•System connection information

•Results of Auto set-up

•Self-diagnostics information

(4) Emergency feature

In the event of a problem with the CNU-700 and CNU- 500, turning their internal OPERATION switch to the EMERGENCY position allows control signals from the remote control panel to be directly connected to the camera head. In this way, program production cancontinue by bypassing the CNU.

	CNU-700	CNU-500
	Up to 6 cameras	Up to 6 cameras
Number of Cameras
	Up to 12 cameras with BKP-7930 fitted	No
connectable
	Up to 96 cameras with multi CNU	No
	connected
	Up to 6 RCPs	Up to 6 RCPs
Number of RCPs connectable	Up to 12 RCPs with BKP-7930 fitted	No
	Up to 96 RCPs with multi CNU	No
	connected
Multi MSU connectable	Yes	No
Multi VCS connectable	Yes	No
Other controller connectable	Yes	Available with optional AUX connector
Programable with remote	Yes	No
control
RS-232C connector for ISR	Yes	Yes
RS-232C connector for	One	No
switcher etc.	Two when BKP-7930 fitted	No
REF. video in	Yes	Yes
Character out	2	1
Assignment between RCP and	Free	Fixed
CHU/CCU

HDC-900/950/930 Series Product Information Manual Chapter 4 Control System 51