JPH0738582A - Terminal address setting method - Google Patents

Abstract

PURPOSE:To automatically set the address of each terminal equipment at a network to which plural terminal equipments are connected. CONSTITUTION:When address setting request signals are simultaneously outputted from plural terminal equipments 1, the collision of address setting request signals is detected by an address request overlap detection part 15 provided at the terminal equipment 1, the address setting request signal is outputted again after the lapse of waiting time T set for each terminal equipment 1 at random and afterwards, a managing terminal equipment 2 receives the first outputted address setting request signal of the terming equipment 1, extracts an idle address number with an address table 24 and reports this address number to that terminal equipment 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal address setting method for automatically setting an address of a terminal device on a network.

[0002]

2. Description of the Related Art Conventionally, in a network having a plurality of terminal devices and a management terminal device for managing the addresses of these terminal devices, when setting the address of each terminal device, a dip switch provided in the terminal device. For example, a method of setting by hardware, pre-storing in a ROM or the like, or externally inputting an address and storing it in the RAM has been used.

However, in these methods, it is necessary to artificially set each terminal device, and particularly in a large-scale network, a great deal of labor is required for address setting, and an artificial setting error or the like may occur. There was a problem that there is also a sex.

Therefore, in Japanese Patent Laid-Open No. 3-245633, in a system including a terminal device, a terminal control device (management terminal device) and a host processing device, when the terminal device issues a request for host connection, the terminal control device There is described a method of automatically setting the address of the terminal device by determining the address of the terminal device and notifying the terminal device of this address.

[0005]

However, such an address setting method has a problem in that when a plurality of terminal devices simultaneously issue host connection request signals, signal collision occurs and address setting cannot be performed. It was
The present invention has been made in view of the above points, and an object thereof is to provide a terminal address capable of automatically setting an address of each terminal device in a network to which a plurality of terminal devices are connected. To provide a setting method.

[0006]

According to the present invention, a terminal device having an address register for storing its own address and a management terminal device having an address table for managing the address of the terminal device are provided via a transmission line. A method for setting a terminal address of a network to be connected, wherein an address request duplication detection unit for detecting that address setting request signals are simultaneously output from a plurality of terminal devices should be added to the terminal device. When the same address is once set to the terminal device and the address setting request signal is output from a plurality of terminal devices at the same time, the address request duplication detecting unit detects the collision of the address setting request signal in each terminal device. , The address setting request signal is output again after a predetermined time set randomly for each terminal device,
The management terminal device receives the address setting request signal, extracts an empty address number from the address table, and notifies the address number to the terminal device that outputs the address setting request signal. is there.

[0007]

In the terminal address setting method of the present invention, when the address setting request signals are simultaneously issued from a plurality of terminal devices, the address request duplication detecting unit provided in the terminal devices detects the address setting request signals. After detecting a collision, the address setting request signal is output again after a waiting time randomly set for each terminal device, and the management terminal device receives the address setting request signal of the terminal device that is output most quickly thereafter. A free address number is extracted from the address table, and this address number is notified to the terminal device.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a network according to an embodiment of the present invention. A terminal device 1 includes an input / output control unit 11, a transmission / reception buffer 12, a processing unit 13, an address register 14, and an address request duplication detection unit 15. The input / output control unit 11 controls transmission / reception of data, and the transmission / reception buffer 12 exchanges data between the input / output control unit 11 and a processing unit 13 described later. The processing unit 13 controls each unit in the terminal device 1. The processing unit 13 generates an address request signal for setting its own address and sends it to the transmission / reception buffer 12. It notifies the duplication detection section. The address register 14 stores its own address.
In the initial stage, a constant initial address is once set by the command from, and then the actual address is set by the notification from the management terminal device 2. The address request duplication detection unit 15 detects a collision of address setting request signals from a plurality of terminal devices 1 on the transmission path 3, and a signal from the processing unit 13 causes the address setting request signal from the terminal device 1 itself. Is aware that
It is detected that the address setting request signal collides with the address setting request signal from another terminal device 1 on the transmission path 3, and the input / output control unit 11 is notified of the detection result. The input / output control unit 11 again sends the address setting request signal after the waiting time T randomly set.

Reference numeral 2 is a management terminal device for managing addresses and the like of a plurality of terminal devices 1 connected to the transmission line 3, and has an input / output control unit 21, a transmission / reception buffer 22, a processing unit 23 and an address table 24. Become. The input / output control unit 21 transmits and receives data, and the transmission / reception buffer 22
Is for exchanging data between the input / output control unit 21 and a processing unit 23 described later. The processing unit 23 controls each unit in the management terminal device 2, and the address table 24 stores the address number of each managed terminal device 1. Upon receiving the address setting request signal from the terminal device 1, the processing unit 23 searches the address table 24 to obtain a vacant address number, and then the terminal device 1
This terminal address number is written in the address table 24, and the terminal device 1 is notified of this terminal address number. Next, the operation of this embodiment will be described based on the flow chart shown in FIG. First, when the system is turned on, the management terminal device 2
Initializes the address table 24 and sets its address to address 0. The same address number, for example, address 1 is set as the initial address in the address registers 14 of all the terminal devices 1. Each terminal device 1 sends an address setting request signal to the management terminal device 2 with address 0. When a plurality of terminal devices 1 send out address setting request signals at the same time, signal collision occurs on the transmission line 3. In each terminal device 1, when the address request duplication detection unit 15 detects this collision, the address setting request signal is retransmitted after a waiting time T randomly set by the input / output control unit 11. The address setting request signal from the terminal device 1 having the shortest waiting time T is received by the terminal management device 2. If again,
When a signal collision occurs on the transmission line 3, the above operation is repeated. The other terminal device 1 has a transmission line 3
It is detected whether or not there is data above, and if there is data already, the address setting request signal is sent again after the waiting time T.

Upon receiving the address setting request signal from the terminal device 1, the management terminal device 2 receives the address table 2
4 is searched, an empty address number is extracted, this address number is written in the address table 24, and this address number is transmitted to the terminal device 1 having the initial address 1.

The terminal device 1 receives the signal from the management terminal device 2, and writes the received address number in the address register 14 as its own address. After that,
This address number will be used as its own address number.

By repeating the above operation, the address numbers can be automatically set in all the terminal devices 1.

Here, the waiting time T is set to be longer than the time from when the management terminal device 2 receives an address setting request signal from a certain terminal device 1 to when the address number is transmitted to that terminal device. If so, a certain terminal device 1
The address setting request signal will not be issued from another terminal device 1 after the address setting request is made by the user until the address is set.

[0014]

As described above, according to the terminal address setting method of the present invention, when the address setting request signals are simultaneously issued from a plurality of terminal devices, the address request duplication detecting section provided in the terminal devices. , The address setting request signal collision is detected, the address setting request signal is output again after a waiting time set randomly for each terminal device, and the management terminal device outputs the address of the terminal device that is output most quickly thereafter. By receiving the setting request signal, extracting an empty address number from the address table, and notifying this address number to the terminal device, in the network where a plurality of terminal devices are connected, the address of each terminal device is automatically A terminal address setting method that can be set manually is provided.

[Brief description of drawings]

FIG. 1 is a block diagram illustrating a network according to an exemplary embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of the above.

[Explanation of symbols]

 1 terminal device 2 management terminal device 3 transmission line 11 input / output control unit 12 transmission / reception buffer 13 processing unit 14 address register 15 address request duplication detection unit 21 input / output control unit 22 transmission / reception buffer 23 processing unit 24 address table T waiting time

Claims (1)

[Claims] 1. A terminal address of a network in which a terminal device having an address register for storing its own address and a management terminal device having an address table for managing the address of the terminal device are connected via a transmission line. In the setting method, an address request duplication detection unit that detects that address setting request signals are simultaneously output from a plurality of terminal devices is added to the terminal device, and the same terminal device is temporarily set to the address setting device. When the address is set and the address setting request signals are simultaneously output from a plurality of terminal devices, each terminal device detects the collision of the address setting request signals by the address request duplication detection unit, and randomly selects each terminal device. The address setting request signal is output again after the set predetermined time, and the management terminal device receives the address setting request signal. A terminal address setting method is characterized in that a vacant address number is extracted from the address table and the terminal number that has output the address setting request signal is notified of the address number.