JPH03213028A - Distributer - Google Patents

Abstract

PURPOSE:To prevent collision between a transmission requirement from a terminal equipment in a fault and a data from a normal terminal equipment by leading only the transmission requirement from a terminal equipment represented by a detected address to a communication means and leading a transmission enable signal by the communication means. CONSTITUTION:When an address detection section 15 outputs a detection address representing the address of a 1st terminal equipment 12-1, only a transmission enable signal CS(0) including the address of the 1st terminal equipment 12-1 is sent to the 1st terminal equipment 12-1 as a transmission enable signal CS(1). Similarly, when the address detection section 15 outputs a detection address representing the address of a 1st terminal equipment 12-n, only a transmission enable signal CS(0) including the address of a n-th terminal equipment 12-n is sent to the n-th terminal equipment 12-n as a transmission enable signal CS(n). The memory of the address detection section 15 is rewritten by the address of a destination terminal equipment included in a succeeding reception data RD from a MODEM 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention provides a modem that is connected to a plurality of terminal devices to which mutually different addresses are assigned, and a destination terminal device that receives information from the modem. The present invention relates to a distribution device that distributes received data including addresses of , to the plurality of terminal devices.

[Prior Art] Generally, this type of distribution device responds to the received data, sends the received data to a plurality of terminal devices, and sends the received data to a destination terminal device indicated by the address among the plurality of terminal devices. The communication unit includes a communication unit (also called a transmission function switching unit) that outputs a transmission request including the own terminal device address.

The communication unit also sends the transmission request from the destination terminal device to the modem, causes the modem to send a transmission enable signal including the terminal device address included in the transmission request, and The transmitting device receives the transmittable signal and sends the received transmittable signal to the destination terminal device.

In such a distribution device, if at least one of the plurality of terminal devices fails while outputting a transmission request, the transmission request from the failed terminal device and
A collision with data output from a normal terminal device, such as a transmission request, occurs, causing a problem in data communication.

Conventionally, in order to prevent such data collisions, a monitoring device that monitors transmission requests from the plurality of terminal devices is provided corresponding to the imaginary number terminal device, and when it is detected that the transmission requests are left out, A distribution device that prohibits transmission of the sending request to the communication unit has been considered.

[Problems to be Solved by the Invention] However, in this distribution device, when at least one of the plurality of terminal devices fails to output transmission requests, the transmission request from the failed terminal device is Collision with data such as a transmission request from a normal terminal device is unavoidable, which impedes data communication. Furthermore, the monitoring device must be provided for each of the plurality of terminal devices, making the configuration complicated.

Therefore, problem 5 of the present invention is that even when at least one of a plurality of terminal devices fails to output transmission requests, the transmission request from the failed terminal device and the normal terminal device It is an object of the present invention to provide a distribution device that can prevent collisions with data such as transmission requests, etc., and can normally perform data communication.

Another object of the invention is to provide a dispensing device of simple construction.

[Means for Solving the Problems] According to the present invention, one modem is connected to a plurality of terminal devices to which mutually different addresses are assigned, and the address of the destination terminal device received from the modem is transmitted. A distributing device that distributes received data including data to the plurality of terminal devices, in response to the received data, sends the received data to the plurality of terminal devices, and among the plurality of terminal devices, the distribution device distributes the received data to the plurality of terminal devices. communication means for outputting a transmission request including a self-terminal device address to a destination terminal device that has been received; a plurality of gate means for making it possible to send a transmission request including a self terminal device address to the communication means from, and responding to the received data, the address of the destination terminal device included in the received data; address detecting means for detecting a detected address and outputting a detected address; and a control signal generation means for sending out a signal, and the communication means sends the transmission request from the gate means to the modem.

Further, according to the present invention, the communication means is connected to the address detection means, and sends the transmission request from the gate means to the modem, so that the modem receives the terminal included in the transmission request. The destination terminal device transmits a sendable signal including a device address, receives the sendable signal, and the terminal device address included in the received sendable signal is indicated by the detected address. A distribution device is obtained, which is characterized in that it sends the received transmittable signal to the destination terminal device only when the addresses match.

[Example] Next, embodiments of the present invention will be described with reference to the drawings.

Referring to FIG. 1, a distribution device (also called a branching device) 10 according to an embodiment of the present invention includes one modem 11 and first to nth terminal devices 12-1 to which mutually different addresses are assigned. ~12-n, the received data RD including the address of the destination terminal device received from the modem 11 is transmitted to the first to nth terminal devices 12-1 to 12-n.
12-n. The modem 11 is connected to, for example, a modem of a central processing unit (not shown).

The distribution device 10 responds to the received data RD, sends the received data RD to the first to n-th terminal devices 12-1 to 12-n, and sends the received data RD to the first to n-th terminal devices 12-1 to 12-n. Among them, it includes a communication unit (also called a transmission function switching unit) 13 that causes the destination terminal device indicated by the address to output a transmission request including the own terminal device address.

Here, it is assumed that the received data RD includes the address of the first terminal device 12-1 as the address of the destination terminal device. In this case, the communication unit 13 communicates with the first terminal device 12
-1 includes the own terminal device address in transmission request R8 (1
) is output. Similarly, if the received data RD includes the address of the second terminal device 12-2, the communication unit 13 sends the second terminal device 12-2 a transmission request RS ( 2) and the received data RD includes the address of the n-th terminal device 12-n, the communication unit 13 outputs the address of the n-th terminal device 12-n.
Transmission request R8(n) including the own terminal device address in n
output.

The first to nth gate sections 14-1 to 14-n are connected to the first to nth terminal devices 12-1 to 12-n, respectively. First to nth gate parts 14-1 to 14-n
When receiving the control signals C(1) to C(n), each of the corresponding terminal devices allows a transmission request including the own terminal device address to be sent to the communication unit 13 from the corresponding terminal device.

The address detection unit 15 responds to the received data RD, detects the address of the destination terminal gZ included in the received data RD, and outputs the detected address. Specifically, the address detection section 15 includes a memory (not shown) that stores the detected address as a stored address, and the stored address becomes the output signal of the address detection section 15.

In response to the detection address, the control signal generation unit 16 selects the gate unit corresponding to the destination terminal device indicated by the detection address from among the first to nth gate units 14-1 to 14-n. Then, the control signal is sent out.

The communication unit 13 sends the transmission request from the gate unit to the modem 11 as a transmission request RS (0). At this time, the first communication unit 13 transmits the transmission request RS(0) to the modem 11.
and transmits to the modem 11 a send ready signal C3 (including the terminal device address included in the send request R5(0)
0) is sent.

Furthermore, the communication unit 13 is connected to the address detection unit 15,
When the send clear signal C3(0) is received and the terminal device address included in the received send clear signal C5(0) matches the destination terminal device address indicated by the detected address. Only the received clear-to-send signal C5(0)
is sent to the destination terminal device.

At this time, the address detection unit 15 detects the first terminal device 12-
If the detection address indicating the address of 1 is output, the first terminal device] Only the sendable signal C3(0) including the address of 2-1 is sent to the first terminal as the sendable signal C3(1). It is sent to device 12-1. Similarly, when the address detection unit 15 outputs a detected address indicating the address of the second terminal device 12-2, the second terminal device 1
Only the sendable signal C5(0) including the address of 2-2 is sent to the second terminal device 12-2 as the sendable signal CS(2), and the address detection unit 15 detects the address of the first terminal device 12.
-n, if the detection address indicating the address of the n-th terminal device 12-n is output, the n-th
is sent to the terminal device 12-n.

The memory of the address detection unit 15 is rewritten with the address of the destination terminal device included in the next received data RD from the modem 11.

[Effects of the Invention] As explained above, according to the present invention, only the transmission request from the terminal device indicated by the address detected by the address detection means is guided to the communication means, and the address detection means Since the transmission enable signal is guided by the communication means only to the terminal device indicated by the detected address,
Even if at least one of the plurality of terminal devices fails to output transmission requests, a transmission request from a terminal device other than the terminal device indicated by the address detected by the address detection means Since there is no uke,
Collision between a transmission request from a failed terminal device and data such as a transmission request from a normal terminal device can be completely prevented, and data communication can be performed normally. Moreover, it is sufficient to provide a simple gate section for each of the plurality of terminal devices, and a distribution device with a simple structure can be obtained.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a dispensing device according to an embodiment of the present invention. 10 is a distribution device, 11 is a modem, 12-1 to 12-n are terminal devices, 13 is a communication section, 14-1 to 14-n are gate sections, 15 is an address detection section, and 16 is a control signal generation section. . 1st =

Claims (1)

[Scope of Claims] 1. One modem is connected to a plurality of terminal devices to which mutually different addresses are assigned, and the received data including the address of the destination terminal device received from the modem is transmitted to the plurality of terminal devices. A distribution device that distributes to terminal devices, in response to the received data, sends the received data to the plurality of terminal devices, and among the plurality of terminal devices, sends the received data to the destination terminal device indicated by the address, a communication means for outputting a transmission request including a self-terminal device address; and a plurality of communication means connected corresponding to the plurality of terminal devices, each of which outputs a self-terminal device address from a corresponding terminal device when receiving a control signal. a plurality of gate means capable of sending a transmission request including a message to the communication means; responsive to the received data, detecting the address of the destination terminal device included in the received data, and detecting the detected address; address detecting means for outputting; and control signal generation for responding to the detected address and sending the control signal to a gate means corresponding to the destination terminal device indicated by the detected address among the plurality of gate means. means, wherein the communication means sends the transmission request from the gate means to the modem. 2. The communication means sends the transmission request from the gate means to the modem, and causes the modem to send a transmission permission signal containing the terminal device address included in the transmission request. The dispensing device according to claim 1, characterized in that: 3. The communication means is connected to the address detection means, and sends the transmission request from the gate means to the modem, so that the modem includes the terminal device address included in the transmission request. Sending a transmittable signal, and receiving the transmittable signal, and the terminal device address included in the received transmittable signal matches the destination terminal device address indicated by the detected address. Only time,
The distribution device according to claim 1, wherein the distribution device transmits the received transmission enable signal to the destination terminal device.