JPH01175430A - Bus connector system - Google Patents

Abstract

PURPOSE:To connect equipments mutually by a communication transmission line without correctly without considering the connection of the terminating resistance of the communication transmission line by inserting sockets into a couple of plug parts respectively and opening two switches connected between electrodes through the terminating resistance. CONSTITUTION:A bus connector has the couple of plug parts, which have electrodes (a), (b), and (c), and electrodes a', b', and c'. The electrodes (a) and a', and electrodes (b) and b' are connected to the terminating resistance 3 through the two switches 4 and 5. Those switches 4 and 5 are normally closed and the switch 4 is opened when a socket part is fitted in the plug part 1. Similarly, when a socket is fitted in the plug 2, the switch 5 is opened. Consequently, when terminal equipments are connected mutually by the communication transmission line, the terminating resistances are interposed at both ends of the communication transmission line automatically and the insertion error of the terminating resistances is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a bus connector for connecting terminal equipment to form a bus type communication network via a communication transmission line in a bus system that transmits information via a communication transmission line. It is related to.

FIG. 2 shows the configuration of a conventional device-side connector section for connecting a terminal device to a conventional communication network.

The connector part has a pair of plug (or socket) parts 6.7 consisting of three electrodes. Electrode a and electrode a', electrode bottom and electrode b' are electrically connected, and electrode C and electrode C'' are respectively connected to the ground. Electrode al electrode a'' and electrode bottom and electrode b' are Each is connected to a bus driver/receiver and transmits information via a communication transmission path. FIG. 3 shows a system configuration diagram when each terminal device is interconnected through a communication transmission path using this connector. Three terminal devices, terminal A, terminal B, and terminal C, communicate with each other through communication line 1.
2, connector A1, connector B, and connector C are connected to each other. Such a bus-type communication transmission line requires terminating resistors at both ends of the communication transmission line, so terminating resistors 8 are required at both ends of the communication transmission line, that is, at connector A and connector 3. FIG. 4 shows a configuration in which a communication transmission path and a terminating resistor are connected to the connector section. The socket (or plug) portion 9.10 is a plug (or socket) 96.
In the terminal resistor 8, a terminal resistor 11 is connected between the electrode A and the electrode 8. A socket (
There is also a plug (or plug) part that can be connected to the connector part of other terminal equipment. With the above configuration, when the respective terminal devices are interconnected via the communication transmission path 12, terminating resistors that are electrically required on the communication transmission path are inserted at both ends of the communication transmission path.

Problems to be Solved by the Invention In such conventional bus connectors, when interconnecting each terminal device through a communication transmission line, the terminating resistor must be taken into account when connecting the terminals, and there is a risk of forgetting to connect the terminating resistor. Problems may occur when interconnecting terminal devices, such as the possibility that information may not be transmitted over the communication transmission path.

Means for Solving the Problems The bus connector according to the present invention has two sockets (or plugs) inserted into a pair of plugs (or sockets), respectively, to connect two electrodes via a terminating resistor. Each switch is opened.

Effect of the Invention According to the present invention, when interconnecting terminal equipment via a communication transmission line, it is possible to realize equipment connection without connection errors without being aware of the connection of the terminating resistor of the communication transmission line.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to the drawings. FIG. 1 shows a configuration diagram of a bus connector according to an embodiment of the present invention. , the bus connector has a pair of plug (or socket) parts, each plug (or socket) part having an electrode a and an electrode C1, an electrode a'', an electrode b°, and an electrode C.
have ゛. Electrodes a and electrodes a°, electrodes and electrodes b' are electrically connected to each other, and at the same time, a terminating resistor 3 and two switches 4.
5. Each switch 4.5
is normally closed, and when the socket (or plug) part 1 is mated with the socket (or plug) part 1, the socket (4) is opened, and similarly the plug (or socket) part 2 is connected to the socket ( The switch 5 is configured to be opened when the (or plug) parts are mated. A configuration diagram of device connection using the present invention is shown in FIG. Terminals A1, B1, and C are interconnected at connectors A1, B1, and C, respectively, via communication transmission lines 12 having sockets (or plugs) at both ends. FIG. 6 shows the open and closed states of the switch in connector A in this configuration. Since the socket (or plug) part at one end of the communication transmission path 12 is engaged with the plug (or socket) part 2, the switch 5 is opened.

Further, since nothing is connected to the plug (or socket) section 1, the switch 4 remains closed. In this state, electrically, a terminating resistor 3 is inserted between the electrodes a1, electrodes a'', electrodes b, and electrodes b''. In other words, a terminating resistor is inserted on the communication transmission path. Further, FIG. 7 shows the open and closed states of the switch at connector B in FIG. 5. In connector B, since the socket (or plug) part of the communication transmission path is engaged with the plug (or socket) part 1 and the plug (or socket) part 2, respectively, the switch 4 and the switch 5 are both open, and the electrical No terminating resistor 3 is inserted between electrode a, electrode a' and electrode b, and electrode b'. In other words, no terminating resistor is connected to the communication transmission path. Therefore, in the device connection configuration diagram shown in Figure 5, the terminating resistor of the communication transmission line is inserted at connector Δ and connector C, and even if the communication transmission line is removed at any point, the terminating resistor is inserted at both ends of the communication transmission line. That will happen. Note that the relationship between the plug and socket in the above embodiments may be reversed, and a detachable connection structure other than the plug and socket may be used.

Effects of the Invention As described above, according to the present invention, when a plurality of terminal devices are interconnected on a communication transmission line, terminating resistors are automatically inserted at both ends of the communication transmission line, and there is no error in inserting the terminating resistor. A bus connector system can be realized.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a bus connector according to an embodiment of the present invention, Fig. 2 is a block diagram of a conventional bus connector, and Fig. 3 is a block diagram of a bus connector according to an embodiment of the present invention. Fig. 4 is a block diagram showing the connection state of the terminal resistor and the communication transmission line at the connector Δ section in the block diagram shown in Fig. 3, and Fig. 5 is the same as Fig. 1. A configuration diagram in which terminal devices are interconnected by communication transmission paths when using the bus connector shown in FIG. FIG. 7 is a configuration diagram showing the connection state of the communication transmission path in the connector 8 section in the configuration diagram shown in FIG. 5. 1-°' Plug part, 2 ・-° Socket part, 3-・
°Terminal resistor, 4.5-- switch, 12- communication transmission line. Name of agent: Patent attorney Toshio Nakao

Claims (1)

[Claims] a pair of plug (or socket) parts each having a plurality of electrodes, and the pair of plugs (or sockets)
The plurality of electrodes in the section plug (or socket) each other
A connector part having a configuration in which the parts are connected to each other and one terminating resistor is connected between the plurality of electrodes via two switches is fixed to a terminal device, and the pair of plug (or socket) parts The socket (or plug) portion of the communication transmission path is inserted into both of the pair of plug (or socket) portions of the connector portion using a communication transmission path having a socket (or plug) portion at both ends that can be freely attached to and detached from the connector portion. By opening the switch when the terminals are connected, a communication transmission path is formed between the plurality of terminal devices, and the connection between the pair of plugs (or sockets) of the connector section is established, regardless of the number of terminal devices. The communication transmission path is formed such that only one of the communication transmission paths is connected and the terminating resistor is inserted into the transmission path only in the connector portions of two terminal devices located at both ends of the communication transmission path. A bus connector system comprising: