JPH04156747A - Communication mode switching device - Google Patents

Abstract

PURPOSE:To easily switch two communication modes through the use of one and the same device by providing a mode switching card to connect selectively two communication patterns by a connector and a card terminal. CONSTITUTION:In order to make the switching connection of some communication mode A and another communication mode B possible, the connection pattern 11c for the mode A and the connection pattern 11d for the mode B are wired respectively the front and the back sides of the mode switching card 11, and are inserted into a card edge type connector 12. Accordingly, if the wiring of the connector 12 to the outside is wired to only the connector terminal 12a of one side, the switching connection of two modes is made possible by turning the direction of the card 11 by 180 deg.. Thus, two communication modes can be easily switched by using one kind of a transmission line.

Description

[Detailed Description of the Invention] [Summary] Regarding the improvement of a communication mode switching device used for data communication, it is an object of the present invention to provide a card having a structure that allows easy switching between two communication modes using the same device. The purpose is to provide communication between a plurality of terminal groups connected to an external line and a plurality of terminal groups on the device side to be connected to the terminal group according to two communication modes: communication mode A and other communication mode B. In the case of connection switching, a multi-core connector with connector terminals individually connected to the two terminal groups, and a connection that partially connects the connector terminals to each other in correspondence with communication mode A. The other part also has wiring of a connection pattern that connects the connector terminals corresponding to communication mode B, and these two connection patterns can be alternatively connected to the connector. The configuration includes a mode switching card connected via a card terminal.

[Industrial application field]

The present invention relates to an improvement in a communication mode switching device used for data communication.

[Conventional technology]

FIG. 4 is a diagram showing an example of the configuration of a conventional data line, and shows an example in which the data line is one line. FIG. 5 is a diagram showing another example of the conventional data line configuration, and shows an example in which there are two data lines. In Fig. 4, 41 is a terminal device, 42
is a data line termination device, 43 is a host computer, 44 is a terminal line connecting the terminal device 41 and the data line termination device 42, and 45 is a data transmission line connecting the data line termination device 42 and the host computer 43.

Furthermore, in FIG. 5, 51 is a terminal device, 52 is a first terminal line,
53 is a first data line termination device, 54 is a first data transmission line, 55 is a second data line termination device, 56 is a second terminal line, 57 is a third data line termination device, 58 is a second data transmission line, 59 is a host computer.

In the case of communication lines like those shown in Figures 4 and 5, terminal bags are generally used! 41.51 is called DTE, and a personal computer or the like is used. Further, the data line termination device 42 as the termination of the data transmission line 45 and the first data line termination device 53 to third data line termination device 57 as the termination of the first data transmission line 54 and the second data transmission line 58 are DCE In the case of digital signals, it is called a home line termination device (D
SU), or modem for analog signals
is a typical CE.

Generally, the terminal line 44 and the first terminal line 52 and the second terminal line 56 are interconnect circuits, such as low-speed R5-
232C transmission line, and the data transmission line 45, the first data transmission line 1154, and the second data transmission line 5
8 uses a digital line or an analog line.

Here, if data communication is performed by connecting the first data transmission line and the second data transmission line, the data line termination device 42 in FIG. 4 and the first data line termination device 53 in FIG.
will connect the DSU and the modem, and the terminal line 44
Since the opposite light of the data line termination device 42 is the terminal device 41 (DTE), the first terminal line 52 needs to be connected in DTE mode (DTE-DCE connection).

Further, it is necessary to connect the terminal device 51 and the first terminal line 52 in DCE mode (DCE-DCE connection).

However, the DTE mode connection and the DCE mode connection differ in the directions of data lines, clock lines, and control lines (for example, DCE-+DTE, DTE-4DCE), and therefore the connection method becomes an important issue.

The details will be explained below using FIGS. 6 and 7.

FIG. 6 is a diagram showing an example of a connection in the conventional mode, and the terminal line 44 in FIG. 4 is a low-speed R5-232C interface, and shows an example of a connection in the DTE mode. The R3-232C connector side terminal RT-SD on the terminal line 44 side of the data line termination device 42 in FIG. 6 and the device side terminals RT to SD inside the data line termination device 42 are as follows:
Buffers 21a-211. They are connected to each other in one-to-one straight opposition via a driver/receiver 21 having a driver/receiver 21 to exchange signals. (NC indicates no connection) On the other hand, FIG. 7 is a diagram showing another example of connection in the conventional mode. For example, the first terminal line 52 in FIG. 5 is connected to a low-speed R5-232C interface. An example of connection in DCE mode is shown. Data line termination device 53 in FIG.
The R5-232C connector side terminal RT-3D on the first terminal line 53 side and the device side terminal RT-5D inside the first data line termination device 53 are connected to the buffers 21a to 211!
However, they are not directly connected to each other in a one-to-one straight opposition manner, but some of the transmission lines are twistedly connected. One method of connection in this case is a twisted cable (R
In the case of 3-232C, it is possible to use SD and RD, or ER and DR (inverted versions).

[Problem to be solved by the invention]

Therefore, two cables, a straight cable and a twisted cable, must be prepared as one transmission line. Another way to use a straight cable is to install a switch to switch the signal lines inside the device, but this requires as many circuits as the number of signal lines, so if a printed circuit board is used, the mounting area will be large. There are challenges.

SUMMARY OF THE INVENTION An object of the present invention is to provide a card having a structure that allows easy switching between two communication modes using one type of transmission line.

[Means to solve the problem]

The present invention provides communication between a plurality of terminal groups connected to an external line and a plurality of terminal groups on the device side to be connected to the terminal group according to two communication modes: a communication mode A and another communication mode B. When performing connection switching, a multi-core connector 12 including connector terminals 12a individually connected to the two terminal groups, and a part corresponding to mode A for communication between the connector terminals. Connection pattern 1 to connect
1c, and the other part has wiring of a connection pattern 11d that connects the connector terminals corresponding to the communication mode B, and these two connection patterns can be selectively connected to the connector. 12 and a mode switching card 11 connected through a card terminal 11b.

[For production]

In the present invention, as shown in FIG. 1, in order to enable switching connection between communication mode A and another communication mode B, connection patterns 11c are provided on the front and back sides of the mode switching card 11 when in mode A, respectively. In the B mode, the connection patterns 11d are wired and inserted into the card edge type connectors 12.

Therefore, if the wiring to the outside of the connector 12 is connected only to the connector terminal 12a on one side, switching the direction of the mode switching card 11 by 180 degrees makes it possible to switch between two modes.

〔Example〕

FIG. 1 is a diagram showing the connection configuration of the mode switching card of the present invention, and FIG. 1(a) shows the connection of mode A, for example, DTE.
Shows connections in mode. FIG. 1(b) also shows a mode B connection, for example a DCEC-mode connection. In the figure, 11
is a mode switching card, and MODE indicates the switching mode.
11a, a card terminal 11b, a connection pattern 11c (a pattern on one side of the mode switching card), and a connection pattern 11d (a pattern on the opposite side of the connection pattern 11c). Note that 12 is a connector that is installed on the motherboard, and connector terminal 1 on one side
It is wired only to 2a and connected to an external circuit. Again 1
3a is silk printing A1 displayed on the motherboard, and 13b is silk printing B displayed on the motherboard.

As shown in FIG. 1(a) and FIG. 1 et al., the connection pattern 11c or 11d of the mode switching card 11 is wired only to the connector terminal 12a on one side of the connector 12 on the motherboard. MODE which is displayed on the mode switching card 11 as shown in a)
When 11a matches the silk-printed A13a side on the motherboard, the mode switching card 11 is connected to the connection pattern 11.
The connection pattern Ilc is formed so that the connection is in mode A, for example, a DTE mode connection. On the other hand, as shown in FIG. 2, rotate the direction of the mode switching card 11 by 180 degrees and insert it into the connector 12.
If 1a is on the side of silk printing B 13b on the motherboard, the mode switching card 11 will be connected to connection pattern 1.
1d connection in mode B, for example, in DCE mode. Below, the second
A method for forming the connection pattern 11c and the connection pattern 11d on the mode switching card 11 will be explained using the drawings and FIG.

FIG. 2 is a diagram showing an example of the connection of the mode switching card of the present invention, and shows the connection in DTE mode.

As shown in FIG. 4, R5-232 on the terminal device 41 side
C connector side terminal RT-SD and data line termination device 42
As shown in FIG. 2, the device side terminal RT-SD inside the mode switching card 11 has a connection pattern 11c and buffers 21a to 21f, and is connected via the driver/receiver 21, such as a transmission line. Signals are exchanged via the cable 20. FIG. 3 is a diagram showing another example of the connection of the mode switching card of the present invention, and shows the connection in DCE mode. As shown in Figure 5, the terminal line 4
4 side R3-232C connector side terminal RT-SD and device side terminal RT inside the data line termination device 42
-SD means the mode switching card 11 as shown in Figure 3.
Connection pattern 11d and buffers 21a to 21! Signals are exchanged via a driver/receiver 21 and a connection cable 30, which is a transmission line, for example. The internal connection of the mode switching card 11 is made using the connection pattern 11c on one side and the connection pattern 11d on the other side, so that the mode switching card 11 can be connected to the 18
By changing the 0 degree direction and inserting a taper, you can switch between DTP mode and DCE mode, and the connecting cable 20
and the connection cable 30 can have the same structure.

In the above embodiment, the mode switching card has one card terminal and the mode is switched by selecting the orientation of the card surface. Alternatively, the mode may be switched by In this case, it is not necessary to make only one side of the contacts of each connector terminal of the multicore connector effective, and a normal connection configuration can be adopted.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, it is possible to switch the communication mode by simply changing the insertion direction of the mode switching card and inserting it, thereby reducing the required mounting area of the switching circuit. It becomes possible.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a connection configuration of the mode switching card of the present invention, FIG. 2 is a diagram showing an example of the connection of the mode switching card of the present invention, and FIG. 3 is a diagram showing another connection configuration of the mode switching card of the present invention. Figure 4 is a diagram showing an example of a conventional data line configuration; Figure 5 is a diagram showing another example of a conventional data line configuration; Figure 6 is an example of a connection in the conventional mode. FIG. 7 is a diagram showing another example of connection in the conventional mode. In the figure, 11 is a mode switching card, and 11a is MODE. 11b is a card terminal, 11c and 11d are connection patterns, 12 is a connector, 12a is a connector terminal, 13a is silk printing A, 13b is silk printing B, M/6i6-
IjεAτTko 113 map east. T-taro massage, no → 1. 8'/l-#Kiki T!
1m4 diagram Figure 5

Claims (1)

[Claims] [1] Two communication modes, communication mode A and other communication mode B, between a plurality of terminal groups connected to an external line and a plurality of terminal groups on the device side to be connected to the external line. When switching connections between terminal groups accordingly, a multi-core connector (12) comprising connector terminals (12a) individually connected to the two terminal groups, and a multi-core connector (12) provided with connector terminals (12a) connected to the two terminal groups individually, and It has the wiring of the connection pattern (11c) that corresponds to the communication mode A, and the other parts have the wiring of the communication mode B between the connector terminals.
a mode switching card (11) having wiring of a connection pattern (11d) connected correspondingly to the above, and selectively connecting these two connection patterns to the connector (12) with a card terminal (11b); A communication mode switching device characterized by comprising: [2] Connector terminal (1) of the multi-core connector (12)
2a) into which each mode switching card (1) is to be inserted.
1) has one side terminal that is effective only on one side, and connection patterns for communication modes A and B are formed on each side of the mode switching card (11) and are led out to card terminals (11b) facing each other. , the orientation of the card connection side is 180
2. The communication mode switching device according to claim 1, wherein the communication mode is switched between the two communication modes by changing the communication mode.