JPH0983998A - Monitor system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To select plural camera units respectively from two monitoring places. SOLUTION: The plural camera units incorporating microphones 5 are connected to a single coaxial cable 1, and a main controller 7 with a television monitor 9 is connected to one end of the coaxial cable 1. In addition, a sub- controller 11 with a television monitor 13 is connected to the other end of the coaxial cable 1. Then these controllers are connected to each other through a twisted pair cable 15 by way of an interface RS 485 so as to selectively operate the plural camera units from both main/sub controllers.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monitoring device for monitoring with video and audio for crime prevention and operation and maintenance of facilities such as factories.

[0002]

2. Description of the Related Art In order to manage facilities for crime prevention and operation and maintenance, an industrial TV called ITV is placed at a monitoring point and the state of the facility is grasped by displaying the status of the monitoring point on a television receiver. Is often done.

The applicant of the present invention has described such a monitoring device as described in Japanese Patent Application Laid-Open No. 7-141579.
Multiple camera units with built-in microphones are connected to one transmission line, and a TV monitor unit with a TV receiver connected to the end is arranged to multiplex various signals on one transmission line. Also, a high-performance multi-point switching type monitoring device has been proposed, which is capable of bidirectional transmission and receiving a video and audio by selecting a desired camera unit by a television monitor unit and monitoring.

[0004]

However, in the above monitoring device, a plurality of camera units can be operated and selected by the television monitor unit arranged at the monitoring station. However, in this device, a plurality of camera units can be selected by one television monitor unit. The camera unit can be selected for operation, and it can handle when there is only one monitoring station, but the office and the site are far apart, and the monitoring station is located in the operation room of the office and the site. It is not possible to install it at two locations, such as when you want to strengthen the surveillance by operating and selecting multiple camera units from each surveillance station.

In view of the above points, an object of the present invention is to provide a monitoring device in which a plurality of camera units can be operated and selected from two monitoring stations.

[0006]

In order to achieve the above object, the present invention has a television receiver at one end of one transmission line to which a plurality of camera units each having a built-in microphone are connected, A main controller for operating and selecting the camera unit is connected, and a sub controller for operating and selecting the camera unit having a television receiver at the other end is also connected, while the main controller and the sub controller are connected via an RS485 interface. It is characterized by being connected by a twisted pair cable.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION In the monitoring device of the present invention, a main controller and a sub controller are installed at two monitoring stations, and operation information of each controller is exchanged with each other through an RS485 interface and a twisted pair cable. . As a result, multiple camera units connected to one transmission line can be operated and selected by each controller, and the video and audio of the desired monitoring location can be monitored by the TV receiver of each controller, and each controller side It is possible to send a message from the microphone of the camera to the monitoring point through the speaker of the desired camera unit side. Further, the operation information can be displayed on the television receiver provided in each controller.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic configuration diagram of a monitoring device of the present invention. A plurality of camera units 2 are connected to a coaxial cable 1 which is a transmission line.
The camera 3, the amplifier 4, the microphone 5, the speaker 6, etc. are provided,
The speaker 6 can output a message while capturing the video and audio of the monitoring location.

A main controller 7 is connected to one end of the coaxial cable 1 to select the camera unit 2 and receive audio and video signals from the camera unit. The main controller 7 is connected to the main controller 7. A microphone 8 for sending a message to the side, a television monitor 9 for outputting received audio and video signals, and an operation unit 10 for inputting various data and operating the equipment are provided.

Further, a sub-controller 11 having substantially the same structure as the main controller 7 is connected to the other end of the coaxial cable 1, and the sub-controller 11 also has a microphone 1
2 and a television monitor 13, and an operation unit 14
It has.

The main controller 7 and the sub-controller 11 are connected by a twisted pair cable 15 via an RS485 interface which is a communication interface built in each controller.

The RS485 interface is an RS23 well known as a serial transfer interface.
This is a further extension of RS422, which has a high-performance 2C interface, and enables high-speed communication and extension of transmission distance, and is compatible with bus connection.

The twisted pair cable 15 is a cable made by twisting insulated conductors together, and is a pair 2
Capacitance is better than a quad in which two pairs of pairs are equalized so that the two cores that are paired with four cores are positioned diagonally Can be made small and the amount of attenuation can be made small, which is convenient for adoption.

Next, the operation and the operation of the monitoring device will be described with reference to the flowchart of FIG.

First, the operation unit 10 of the main controller 7
In step S1, it is determined whether or not there is a key input for selecting a preset camera unit number (S1). If there is no key input, the key input waits. If there is a key input, the designated camera unit is selected. While receiving video and audio from, refer to the contents of the receive buffer (S
2) It is determined whether there is sub information from the sub controller 11 (S3).

If there is no sub information, the main information is written in the transmission buffer (S4), and if there is sub information, the sub information is written in the transmission buffer (S5). Then, the information in the transmission buffer is first displayed on the television monitor 9 of the main controller 7 so as to be superimposed on the image of the monitored portion, so-called imposing display (S6).

Next, the information in the transmission buffer is transmitted to the sub controller 11 through the RS485 interface and the twisted pair cable 15 (S7). When the main information is received by the sub controller 11 (S8), it is written in the reception buffer (S9), the sub controller 11 refers to the contents of the reception buffer (S10), and the information is input to the television monitor 13 of the sub controller 11. The pose is displayed (S11).

When the camera unit is operated and selected from the sub controller 11 side, the sub controller 1
It is judged whether or not there is a key input from the operation unit 14 of No. 1 (S12), and if there is no key input, it waits for a key input, and if there is a key input, a video or audio signal from a predetermined camera unit is captured. , Is displayed on the television monitor 13, and sub information such as the camera unit number is written in the transmission buffer (S13). Then, the information in the transmission buffer is transmitted to the main controller 7 side through the RS485 interface and the twisted pair cable 15 (S14). The main controller 7 receives the information transmitted from the sub controller 11 (S15) and writes it in the reception buffer (S16).

The contents of the reception buffer on the main controller 7 side are read in the step of referring to the contents of the reception buffer in step S2, and an impose display is displayed on the television monitors 9 and 13 of the main controller 7 and the sub controller 11 according to the procedure below. To be done.

Further, the microphones 8 and 12 provided in the main controller 7 and the sub-controller 11 can be used to send a message from the speaker of a predetermined camera unit to the monitoring location.

[0022]

As described above, in the surveillance device according to the present invention, a plurality of camera units 2 having the microphones 5 built therein.
Is connected to one coaxial cable 1 which is a transmission line, a main controller 7 having a TV monitor 9 is connected to one end of the coaxial cable 1, and a sub-controller 11 having a TV monitor 13 is also connected to the other end. In addition, the main controller 7 and the sub-controller 11 are connected to RS4.
Since the 85 interface and the twisted pair cable 15 are connected to each other, the operation information in the main controller 7 and the sub controller 11 is transmitted to each other to share the information, and the information and various signals are controlled so as not to collide during the selection operation of the camera unit, A desired camera unit can be selected from a plurality of camera units by each controller installed in two places, and a desired monitoring place can be monitored at any time.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a monitoring device of the present invention.

FIG. 2 is a flowchart showing the operation and operation procedure of the monitoring device.

[Explanation of symbols]

1 ... Coaxial cable (transmission line) 2 ... Camera unit 5 ... Microphone 7 ... Main controller 9 ... TV monitor (image receiver) 11 ... Sub controller 13 ... TV monitor (image receiver) 15 ... Twisted pair cable

Claims (1)

[Claims] 1. A television receiver is provided at one end of one transmission line to which a plurality of camera units each having a built-in microphone are connected, and a main controller for operating and selecting the camera unit is connected to the other end. Also, while the sub-controller having a television receiver for operating and selecting the camera unit is connected, the main controller and the sub-controller are connected by a twisted pair cable via an RS485 interface.