JPH0484539A - Connection destination recognition system - Google Patents

Abstract

PURPOSE:To immediately discriminate mis-connection of a cable or a broken cable by sending an address number of a slave set to a master set through the connection cable and using an address reception circuit decided by the master set side so as to recognize the sent address number. CONSTITUTION:When an address number, e.g. '5' is assigned to a slave set 1, the number is expressed in 4-digit binary code and a switch 2 of the slave set 1 is set to a state of '0101', that is, an address line 31 is set to '0', an address line 32 is set to '1', an address line 33 is set to '0', and an address line 34 is set to '1'. The state of the address lines is informed to a master set 11 through a connection cable 6 and an address reception circuit 9 of the master set 11 receives an address number corresponding to the address lines 31-34 of the slave set 1. The address numbers are sequentially read by a scan circuit 10 and recognizes to which slave set 1 each address reception circuit 9 is connected. Thus, mis-connection of a cable or a broken cable is immediately discriminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a connection destination recognition system, and more particularly to a connection destination recognition system that reliably recognizes connections between a plurality of slave units and a base unit.

[Conventional technology]

Conventionally, when a plurality of handsets 1 and a base unit 1 are connected by a connection cable 16 as shown in FIG. 2, even if the connection destination is incorrect, it cannot be discovered. If the data output from a plurality of slave units 1 are of different nature and are connected incorrectly, the data receiving circuit on the base unit 11 side can recognize the erroneous connection from the data matching. However, since the data output from the handset 1 has the same characteristics within the shell, the base unit 11 cannot recognize the incorrect connection. It is only at the stage of communication between the handset 1 and the base unit 11 that the user realizes that the originally planned communication with the handset 1 is not possible.

[Problem to be solved by the invention]

In this way, with conventional cable connections, even if there is an incorrect connection, it is difficult to discover it. It treats it as coming from the slave device that was originally intended. For example, if each child device is a data input terminal, data input from one data input terminal will be processed by the parent device as data from another data input terminal.

Furthermore, with conventional cable connections, even if it is known that there is a misconnection somewhere, it takes a great deal of effort to find the misconnection if there are a large number of slave devices. Particularly, when the distance between the child device and the parent device is far, it takes an enormous amount of time.

[Means to solve the problem]

The connection destination recognition method of the present invention is a connection destination recognition method for a system consisting of a plurality of child devices and a parent device that collects data from these child devices through a connection cable, in which an address number is assigned to the connection cable. A slave side switch,
a base unit side address receiving circuit that receives the address number from the slave unit side switch through the connection cable; and a scanning circuit that sequentially reads the address numbers sent from the plurality of slave units from the base unit side address receiving circuit. It is equipped with

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention.

In Figure 1, 1 is a slave unit, ]1 is a master unit, and slave unit 1
The address number assigned to the handset 1 is set in the switch 2 of the handset 1. For example, the handset 1 assigned the address number "5" expresses it in a 4-digit binary code, and sets the switch 2 to the state rO]-01, , that is, the address line 31 is set to 'OJ, 32 ``rl'', 3B ``OJ''
, 34 are set to "1". The states of these address lines are transmitted to the base unit 11 through the connection cable 6. In the base unit 11, the address receiving circuit 9 receives the address line 3 of the slave unit 1.
Receive address numbers corresponding to 1-34. This address number is sequentially read by the scan circuit 10, and which slave device 1 each address receiving circuit 9 is connected to is known from the address number.

〔Effect of the invention〕

As explained above, the present invention sends the address number of the slave unit to the base unit through the connection cable, and recognizes the sent address number by a predetermined address receiving circuit on the base unit side, which prevents incorrect connection of the cable. , discontinuity can be immediately determined. In addition, in the case of an erroneous connection, since the address number of the other handset is sent, it is possible to immediately determine which handset and which handset are incorrectly connected. Therefore, even when a large number of slave units are installed apart from the base unit, erroneous connections can be easily discovered, and there is no need to waste effort on wiring.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram of an example of a system to which the present invention is applied. ]...Slave unit, 2...Switch, 31-34...Address line, 4, 5, 7.8...Connector, 6...Connection cable, 9...Address receiving circuit, 10 ...Scan circuit, 11...Base unit.

Claims (1)

[Claims] In a connection destination recognition method for a system consisting of a plurality of slave units and a master unit that collects data from these slave units via a connection cable, a switch on the slave unit side that assigns an address number to the connection cable, and a master unit that collects data from these slave units through a connection cable. The main unit side address receiving circuit receives the address number from the side switch through the connection cable, and the scan circuit sequentially reads the address numbers sent from the plurality of slave units from the main unit side address receiving circuit. A connection destination recognition method characterized by: