JPH0323737A - Transmission destination selecting equipment - Google Patents

Abstract

PURPOSE:To eliminate the need for the connection change of a transmitter- receiver and the setting change of the address inherent in a receiver by providing an address part with a fixed value and a variable address part in the transmission data of the transmitter-receiver connected in series. CONSTITUTION:The transmitter 1 is connected to plural receivers 2 and 3 in series, and the address part 6 with the inherent value and the variable address part 7 are provided in data transmitted from the transmitter 1 to a desired receiver. The address parts 6 and 7 in a reception frame are compared with a comparator 12, a data read circuit 14 reads a data part 8 in the reception frame when the address part 6 with the inherent value coincides with the variable address part 7. Meanwhile, when noncoincidence is obtained, the variable address part 7 is added at an adder circuit 13, and an addition result is set at the variable address part 10, then, the data is transmitted to the receiver. In such a manner, it is possible to eliminate the need for the connection change of the transmitter-receiver and the setting change of the address of the value inherent in the receiver.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to device selection means for transmitting data from a transmitting device to one of a plurality of receiving devices.

〔overview〕

The present invention provides a means for transmitting data to one of a plurality of vertically connected receiving devices, in which an address unique to a desired receiving device and an address whose value changes each time the signal passes through the receiving device are provided. By comparing the correspondence between these two addresses, it is possible to easily configure the system even if the number of installed receiving devices increases or decreases.

[Conventional technology]

In the conventional example, as shown in FIG.
and 22, and when transmitting data from the transmitting device 20 to the receiving device 22 with the transmitting device 20 and the receiving device 21 connected, the transmitting device 20 and the receiving device 21 are connected to each other. A method of changing the connected data line 23 to the data line 24 connected to the receiving device 22 and transmitting data from the transmitting device 20 to the receiving device 22;
As shown in FIG. 4, a transmitting device 30 and a plurality of receiving devices 3
1 and 32 are connected via a bus 35, and unique value addresses 33 and 34 are provided for each receiving device. For example, the unique value address 33 of the receiving device 31 is set to "1", and the receiving device
The address 34 of the unique value of 2 is "2", and the transmitting device 30
A unique value address part is provided in the data transmitted from the transmitter 30 to the receivers 31 and 32.
When transmitting data to the address section of the unique value in the data, the unique value address 34 of the receiving device 32 is set to "
2" and sends the data from the transmitting device 30, and the receiving device 32 finds that the address part of the unique value in the received data matches the address 34 of the unique value of the receiving device 32 itself,
There is a method to retrieve all received data.

[Problem that the invention seeks to solve]

When a transmitting device and a receiving device are connected one-to-one, the connection between the transmitting device and the receiving device must be changed each time the receiving device that should receive data is changed when transmitting data. The disadvantage is that it becomes complicated, and if a unique value address is provided for each receiving device, the unique value address of the receiving device must be reset every time the configuration of the receiving device is changed, so changing settings is complicated. There is.

The present invention is intended to eliminate such drawbacks, and aims to provide a destination selection device that can easily cope with changes in the number of installed receiving devices.

[Means for solving problems]

The present invention provides a plurality of receiving devices each having a data reading circuit for reading data, one transmitting device, and data transmitted from the transmitting device passing through one of the receiving devices to another one of the receiving devices. In a destination selection device included in a communication system having a route for sequential transfer, the transmitting device includes means for adding a variable address and a fixed address unique to the destination to data to be transmitted, and the receiving device The fixed address added to the incoming data is compared with the variable address, and when it is determined that these two addresses match, the data related to this address is given to the data reading circuit, and the When it is determined that two addresses do not match, the value of the variable address is changed by a predetermined value, and the calculation means is applied to the means for transmitting the data to which the changed variable address and fixed address are added to the next receiving device. It is characterized by being equipped.

[Effect]

A transmitting device and a plurality of receiving devices are connected in series, and data is transmitted from the transmitting device to a desired receiving device. A unique value address part and a variable address part are provided in the data, and the unique value address part and the variable address part in the data are compared. If the result of this comparison is a mismatch, the variable address part is added or subtracted, and this The added or subtracted variable address part and data part are transmitted to the next receiving device. If there is a match, all data will be retrieved.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the structure of this embodiment.

In this embodiment, as shown in FIG. and a data line 5 for connection.

That is, in this embodiment, a receiving device 2 includes an input data reading circuit 4 which is a data reading circuit that reads data.
and 3, one transmitting device 1 and the data transmitted from this transmitting device 1 is passed through the receiving device 2 to the receiving device 3.
The transmitting device 1 includes means for adding a variable address and a fixed address unique to the destination to the data to be transmitted, and the transmitting device 1 includes means for adding a variable address and a fixed address unique to the destination to the data to be transmitted. 2 and 3, the fixed address added to the incoming data is compared with the variable address, and when it is determined that these two addresses match, the data related to this address is provided to the data reading circuit; Also, when it is determined that there is a mismatch between these two addresses,
It includes a comparator circuit 12 and an adder circuit 13, which are arithmetic means for changing the value of the variable address by a predetermined value and providing the data to which the changed variable address and fixed address are added to the means for transmitting it to the next receiving device. .

Next, the operation of this embodiment will be explained.

When transmitting device l selects receiving device 2 and transmits data, the address part of the unique value in the frame transmitted from transmitting device 1 to receiving device 2 is the number of connected receiving devices counting from transmitting device 1. Indicates whether to send data to the device, and since receiving device 2 is the first receiving device counting from transmitting device 1, the address part of the unique value in the frame sent from transmitting device 1 to receiving device 2 is “1”. , the transmitting device 1 transmits the frame with the variable address part set to "1", the receiving device 2 receives the frame transmitted by the transmitting device I, and compares the address part 6 of the unique value in the received frame with the variable address part 7 The signal is sent to circuit 12.

The comparison circuit 12 compares the address part 6 of the unique value and the variable address part 7, and as a result, the address part 6 of the unique value and the variable address part 7 match, so the comparison circuit 12 connects the data reading circuit l4 to the transmitting device. After receiving the command, the data reading circuit 14 reads the data part 8 in the frame received from the transmitter 1.

Furthermore, when transmitting device 1 selects receiving device 3 to transmit data, since receiving device 3 is the second receiving device counting from transmitting device l, the frame transmitted from transmitting device 1 to receiving device 2 is The address part of the unique value in is "2",
The transmitting device 1 transmits the frame with the variable address section set to "1," and the receiving device 2 reads the address section 6 and the variable address section of the unique value in the received frame in the same way as when transmitting data from the transmitting device 1 to the receiving device 2. As a result, the address part 6 of the unique value and the variable address part 7 do not match, so the comparison circuit 12 sends the variable address part 7 to the adder circuit 13. The adder circuit 13 adds "1" to the variable address section 7 and sends the result of this addition to the receiving device 2.
It is set in the variable address section 10 in the frame transmitted from. The receiving device 2 transmits data to the receiving device 3, and the receiving device 3 executes the same processing as the processing of the receiving device 2 when the transmitting device 1 selects the receiving device 2 and transmits data. Read the data part in the frame received from 2.

[Effects of the Invention] As explained above, the present invention connects a transmitting device and a plurality of receiving devices in series, and provides a unique value address section and a variable address section in the data transmitted from the transmitting device to the receiving device. Since data can be sent to any receiving device without setting an address in the receiving device, it is possible to easily make changes when adding or removing receiving devices.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the structure of an embodiment of the present invention. FIG. 2 is a diagram showing the structure of a frame used in an embodiment of the present invention. FIG. 3 is a block diagram of a conventional example in which a transmitting device and a receiving device are connected one-to-one. FIG. 4 is a block diagram of a conventional example in which a unique value address is provided for each receiving device. 1, 20, 30... transmitting device, 2, 3, 21, 22,
3L32...Receiving device, 4, 5, 23, 24...Data line, 12...Comparison circuit, 13...Addition circuit, 1
4...Manual data reading circuit, 35...Bus.

Claims (1)

[Claims] 1. A plurality of receiving devices each having a data reading circuit for reading data, one transmitting device, and data transmitted from the transmitting device passing through one of the receiving devices to the receiving device. In a destination selection device included in a communication system having a route that is sequentially transferred to another, the transmitting device includes means for adding a variable address and a fixed address unique to the destination to the data to be transmitted. , The receiving device compares the fixed address added to the incoming data with the variable address, and when it is determined that the two addresses match, provides the data related to this address to the data reading circuit, In addition, when it is determined that there is a mismatch between these two addresses, the value of the variable address is changed by a predetermined value, and the data to which the changed variable address and fixed address are added is transferred to the next receiving device. A destination selection device characterized in that it includes arithmetic means for calculating.