JPH04219037A - Address setting system in 1:n serial communication system - Google Patents

Abstract

PURPOSE:To eliminate the need for the provision of a dip switch or the like for setting an address to each slave set and to prevent mis-setting. CONSTITUTION:A switch 40 switching a communication line 30 is provided to each slave set 20, and a master set 10 sends an address setting signal specific to each slave set 20 to each slave set 20 through a communication line 30 at application of power supply or the like. Thus, each slave set 20 receives the address setting signal from the master set 10 to finish the address setting and to close the switch 40 of a succeeding slave set 20 connected in series with the preceding slave set. Then the address setting signal from the master set 10 reaches the succeeding slave set 20 by closing the switch 40.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to an address setting system in a one-to-N serial communication system, and more particularly, the present invention relates to an address setting system in a one-to-N serial communication system, and in particular, in which one base unit and a plurality of slave units are connected in series to the base unit through communication lines. The present invention relates to an address setting system in a 1-to-N serial communication system.

0002

2. Description of the Related Art A 1-to-N serial communication system is already known in which a base unit and a plurality of slave units are connected in series to each other via communication lines, and communication is performed between the base unit and each slave unit. This communication system is used in vending machines for various products,
In automatic ticket vending machines, etc., which are used as station equipment, multiple push-button switch sections operated by users for selecting products, setting ticket purchase prices, etc. are used as child devices, and one arithmetic control section is used as a parent device. It is being considered that this method can be used for communication between a plurality of push button switch sections and one arithmetic control section.

In automatic vending machines, automatic ticket vending machines, etc. using a 1-to-N serial communication system, it is no longer necessary to connect each of the plurality of push button switch sections to one arithmetic control section through individual signal lines. The number of wires can be reduced, and it is also possible to easily accommodate an increase in the number of push button switch sections.

0004

[Problems to be Solved by the Invention] However, in a 1-to-N serial communication system, each slave unit, such as a push button switch unit, is required to have an individual Address needs to be set.

[0005] This address setting is generally performed by a hardware configuration using a dip switch, etc. provided for each slave device, but in this case, it is necessary to provide a dip switch, etc. for each slave device. There is, which is
This may increase the cost of the device and may cause setting errors such as duplicate settings of the same address or forgetting settings.

The present invention has been made in view of the above-mentioned problems, and it is not necessary to provide a dip switch for setting an address for each slave unit, and moreover, it is a one-pair system that does not cause setting errors. The object of the present invention is to provide an address setting system in an N series communication system.

[0007]

[Means for Solving the Problems] According to the present invention, one base unit and a plurality of slave units are connected to the base unit in series through communication lines, and the base unit and the base unit are connected in series to each other by communication lines. In the address setting system in the 1-to-N serial communication system in which communication is performed between each slave unit, a switch is provided between each slave unit to open and close the communication line between each slave unit, and When the power is turned on, etc., an address setting signal unique to each slave unit is sent to each slave unit through the communication line, and each slave unit receives the address setting signal from the base unit and completes the address setting. 1, characterized in that the switch between the connected slave unit and the next slave unit is closed, and when the switch is closed, the next address setting signal from the base unit reaches the next slave unit. This is accomplished by an addressing system in a N-to-N serial communication system.

[0008]

[Operation] According to the above-described configuration, when the power is turned on, each slave unit receives an address setting signal from the base unit and completes the address setting. The switch is closed, and as a result, the next address setting signal from the base unit reaches the next slave unit, and address settings are automatically performed sequentially from the slave unit closest to the base unit.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows one embodiment of a 1-to-N serial communication system implementing an address setting system according to the present invention. The 1-to-N serial communication system includes one base unit 10,
The base unit 10 and the multiple slave units 20 are connected in series with each other by a communication line 30, and the communication line 30 connects the base unit 10 and each slave unit 20. Communication is now taking place between them.

As shown in FIG. 2, the base unit 10 has a C
PU 11, system program memory 12, handset reception register 13, handset transmission register 14, serial-to-parallel converter 15 for reception, serial-to-parallel converter 16 for transmission, input terminal CIN, output terminal COUT and an input terminal C
Both IN and output terminal COUT are connected to a communication line 30.

The system program memory 12 stores a system program for overall control and an address setting program.
It is called by the CPU 11 and executed by the CPU 11 when the power is turned on, reset, etc., and an address setting signal unique to each slave unit is transmitted to each slave unit 20 via the communication line 30. In addition, in this embodiment, CPU1
When a power-on signal is applied to 1, an address setting program is executed.

As shown in FIG. 3, each slave unit 20 includes a receiving serial-to-parallel converter 21 and an address setting register 2.
2, an address comparator 23, a latch circuit 24, a three-state output circuit 25, a manual switch 26 such as a push button switch, a light emitting element 27 that displays a message such as "on sale", "sold out", " It has a light emitting element 28 for displaying a message such as "Sale discontinued", an input terminal IN, and an output terminal OUT, and both the input terminal IN and the output terminal OUT are connected to a communication line 30. Address setting register 2
Reference numeral 2 denotes a volatile address memory which, after being given a power-on signal, takes in the address setting signal from the base unit 20 only once and holds it.

A switch 40 is provided between adjacent slave units 20 to open and close the communication line 30 between the two slave units 20. The switch 40 is constituted by, for example, an analog switch, and is turned on and closed when an address is set in the address setting register 22.

The input terminal IN of each slave unit 20 is connected to the communication line 30 on the side of the base unit 10 from the switch 40 between the next slave unit 20 connected in series, and the output terminal OUT of each slave unit 20 is The switch 40 between the connected handset 20 and the next handset 20 is connected to the communication line 30 .

It should be noted that the switch 40 attached to the final, ie, Nth, slave unit 20 is not necessarily required, and is provided for uniformity of each slave unit as a component.

Next, the address setting operation of the handset 20 will be explained using FIG.

In this embodiment, the address setting of the handset 20 is executed when a power-on signal is given to the CPU 11, that is, when the power is turned on, and in this address setting, initialization is first performed. I (Step 10)
All the switches 40 are turned off, and each slave unit 20 is turned off.
The three-state output circuit 25 sets the output terminal OUT to a non-logic state due to high impedance. In this initialization, the count n is reset to "0".

Next, the CPU 11 of the base unit 10 sets the address setting signal ADD to "address 0" (step 20).
), this address setting signal ADD is sent to the handset transmission register 1.
4. Send the output terminal COUT to the communication line 30 via the serial-to-parallel converter 16 (step 30).

At this time, all the switches 40 are still in the off state, so the address setting signal AD of address 0 is
D is input to the input terminal IN of the first handset (handset 0) 20, and only the first handset 20 receives the address setting signal ADD of "address 0". It is taken into the address setting register 22, and the address setting register 22 comes to hold it. As a result, the address of the first handset 20 is set to "0".

[0021] When the address setting of the first handset 20 is completed, the first handset 20 sets its own output terminal OUT to the output state, and also switches between it and the next second handset (handset 1) 20. (SW0) 40 is turned on, and this switch 40 is turned on.

The CPU 11 starts time counting by the timer T from the time when the address setting signal ADD is sent to the communication line 30 (step 40), and from the time when the address setting signal ADD is sent to the communication line 30, a predetermined time TSET is started.
When has elapsed (step 40), the timer T is reset and the count n is incremented by one (step 60). At this time, the first slave unit 20
This is when the switch 40 between the second handset 20 and the second handset 20 is turned on.

Next, it is determined whether the count n has reached N, which is one smaller than the number of slave units 20 (step 7).
0), if n=N, the address setting operation ends as the address setting of all the handsets 20 is completed, whereas if n=N, the address setting of all the handsets 20 is still completed. If not, the address number of the address setting signal ADD is incremented by one in order to set the address of the next handset 20 (step 80), and the process returns to step 30 and this new address setting signal ADD, this Sometimes, the address setting signal ADD of "address 1" is sent to the communication line 30 from the output terminal COUT of the base unit 10.

[0024] At this time, the first slave unit 20 (slave unit 0)
Since the switch (SW0) 40 between this and the next second handset (slave unit 1) 20 is in the on state, the main unit 1
0's output terminal COUT to the communication line 30.
The address setting signal ADD for “Address 1” is set by the switch (S
W0 ) 40 and is input to the input terminal IN of the second handset 20, and the second handset 20 is set to "address 1".
This is taken into the address setting register 22 of the second handset 20, and the address setting register 22 comes to hold it. As a result, the address of the second handset 20 is set to "1".

[0025] When the address setting of the second handset 20 is completed, the second handset 20 sets its own output terminal OUT to the output state, and also switches between the second handset 20 and the third handset (handset 2) 20. (SW1) 40 is turned on, and this switch 40 is turned on.

Thereafter, the CPU 11 of the base unit 10 repeats the address setting as described above, so that the addresses of the slave units 20 are automatically set in the order of those closest to the base unit 10.

[0027] When the address setting of all slave units 20 is completed, the address setting operation is completed, and from then on, communication is performed between the master station 10 and each slave unit 20 according to the set address, and the manual Signals related to the opening and closing of the switch 26 are transmitted from each slave unit 20 to the base unit 10, and the base unit 10
starts transmitting light emission control signals for the light emitting elements 27 and 28 of each slave unit 20 to each slave unit 20 (step 90).

[0028]

As can be understood from the above explanation, according to the address setting system in a 1-to-N serial communication system according to the present invention, each slave unit receives an address setting signal from the base unit when the power is turned on, etc. By receiving this and completing the address setting, the switch between the next slave unit in the series connection is closed, so that the next address setting signal from the base unit can reach the next slave unit. Since address settings are automatically performed sequentially starting from the child device closest to the parent device, there is no need to provide a dip switch for address setting on each child device, and there is no possibility of setting errors, reducing costs. At the same time, maintainability is greatly improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of a 1-to-N serial communication system implementing an address setting system according to the present invention.

FIG. 2 is a block diagram showing the configuration of a parent device.

FIG. 3 is a block diagram showing the configuration of a slave unit.

[Figure 4] Flowchart showing address setting operation

[Explanation of symbols]

10 Base unit 20 Child machine 30 Communication line 40 Switch

Claims (1)

[Claims] Claim 1: In a 1-to-N serial communication system, in which one base unit and a plurality of slave units are connected in series to each other via a communication line, and communication is performed between the base unit and each of the slave units. In the address setting system, a switch is provided between each slave unit to open and close a communication line between each slave unit, and when the power is turned on, the base unit sets a unique address to each slave unit via the communication line. After transmitting a setting signal, each slave unit receives an address setting signal from the base unit and completes the address setting, and then closes the switch between it and the next slave unit in series connection, and when the switch closes, An address setting system in a 1-to-N serial communication system, characterized in that it is configured so that the next address setting signal from a master unit reaches the next slave unit.