JPH02241158A - Communication system - Google Patents

Abstract

PURPOSE:To facilitate the building of a communication system by connecting a communication port equipped as a standard to processor of a master station and local line with a communication adaptor. CONSTITUTION:Communication is implemented between terminal equipements (10-1)-(10-n) and a processor 14 of a master station via the local line 12 and a signal sent from a communication port 16 of the processor 14 is fetched by a 1st reception means 22 of a communication adaptor 20 through a communication cable 18 and converted into a signal for the line 12 by a 1st conversion means 24 and sent to the line 12. Moreover, the signal sent from the terminal equipments (10-1)-(10-n) is fetched through the line 12 by a 2nd reception means 28 of the communication adaptor 20, converted by a 2nd conversion means 30 into a signal for the communication cable 18 and sent to the communication cable 18. Thus, the same communication adaptor 20 is used regardless of the type of the processing unit 14 and the system is easily built up.

Description

[Detailed Description of the Invention] [Table of Contents] Overview Field of Industrial Use Conventional Technology Problems to be Solved by the Invention Means for Solving the Problems Effects of the Invention [Summary] Processing device of master station and slave station The purpose of this is to facilitate the construction of a communication system with respect to a communication system in which slave station terminals communicate via a private line, and the slave station communicates with the terminal via a private line to which the slave station terminal is connected. It has a processing device of a master station, a communication cable connected to a communication port prepared in advance in the processing device, and a communication adapter to which a local line and communication cable are connected, and the communication adapter is connected to the communication port of the processing device. a first receiving means that receives a signal transmitted from the communication cable from the communication cable; a first converting means that converts the signal received by the first receiving means into a signal for the local line; a first transmitting means for transmitting to;
A second receiving means that takes in the signal sent from the terminal from the private line, a second signal converting means that converts the signal taken in by the second receiving means into a signal for the communication cable, and conversion by the second converting means. means for transmitting the signal to the communication cable;
including, consisting of.

[Industrial Application Field] The present invention relates to a communication system in which a master station processing device and a slave terminal communicate via a private line.

In a POS system, a cash register terminal of a slave station is connected to a processing device of a master station that functions as a controller via a private line, and product information and the like are transmitted from the processing device of the master station to the cash register terminal of the slave station.

This puts the cash register terminal in a state where sales data can be input manually, and the sales data input manually at the register terminal is collected by the processing device of the master station.

A personal computer is often used as the master station of the POS system.

[Prior Art] FIG. 4 shows the configuration of a conventional POS system, in which a plurality of cash register terminals 10-1, 10-
2...10-n are connected to the local area line 12.

The cashier terminals 10-1 and 10-2 are connected via this internal line 12.
... 10-n and the processing device 14 of the master station, and a personal computer is used as the processing device 14 that functions as a system controller.

The processing device 14 (personal computer) has its main body 4
0. Keyboard 42. It consists of a display 44, and an interface port 46 is inserted into an option slot of the main body 40.

Furthermore, the local area line 12 is connected to the interface port 46, and the communication program supplied on the floppy disk is executed in the main body 4 of the processing device 140.

As a result, the processing device 14 and the cash register terminal 10-1゜10-
2 . . . 10-n is performed using the interface port 46.

[Problems to be Solved by the Invention] Here, the interface port 46 and the communication program cannot be used with a personal computer of a different model.

Therefore, in the past, each time a different personal computer was adopted as a system controller, a new interface port 46 and communication program were developed, which required a lot of time and effort to develop the system. was being spent.

The present invention has been made in view of the above-mentioned conventional circumstances, and
Its purpose is to facilitate the construction of this type of system.

[Means for Solving the Problems] In order to achieve the above object, a system according to the present invention is configured as shown in FIG.

In the figure, slave station terminals 10-1, 10-2,
...10-n are connected to a local line 12, and communication is performed between the terminals 10-1, 10-2, ...10-n and the processing device 14 of the master station via the local line 12.

A communication cable 18 is connected to a communication port 16 prepared in advance in this processing device 14.
is connected to the local area line 12 via the communication adapter 20.

The communication adapter 20 connects the communication port 16 of the processing device 14
The signal transmitted from the communication cable 18 is captured by the first receiving means 22, the signal thus captured is converted into a signal for the local line 12 by the first converting means 24, and the signal sent from the first transmitting means 26 is converted into a signal for the local line 12. 12.

In addition, the signals sent from the terminals 10-1, 10-2, . It is converted by the converting means 30 and sent from the second transmitting means 32 to the communication cable 18.

[Operation] In the present invention, the processing device 14 can transmit and receive signals using the communication port 16 and the terminals 10-1, 102...10-n.
Signals that can be communicated using the local area line 12 are bidirectionally converted into the format of the other party at the communication adapter 20.

Therefore, the communication adapter 2o can function as an interface interposed between the communication port 16 of the processing device 14 and the local area line 12 to which the terminals 10-1, 10-2---10-n are connected.

[Embodiment] Hereinafter, a preferred embodiment of the system according to the present invention will be described based on the drawings.

FIG. 2 shows the configuration of a POS system to which the present invention is applied, in which cashier terminals 10-1, 10-2...10
-n communication port (R interface) 50-1.5
A private line 12 is connected to 0-2...50-n.

The processing device 14 also includes a main body 40. A so-called personal computer consisting of a keyboard 42 and a display 44 is used, and the processing device main body 40 has a serial communication port (RS232C interface or R
3422 interface) 16 is equipped as standard.

A communication cable 18 is connected to this communication port 16, and the communication cable 18 and the above-mentioned local line 12 are connected to a communication adapter 2o.

FIG. 3 shows the configuration of the communication adapter 20, in which the local area line 121 and communication cable 18 are connected to connectors 52 and 54, respectively.

Then, the transmission signal given from the processing device 14 to the connector 54 via the communication cable 18 is manually transmitted to the receiver 56 for R5232C and the receiver 58 for R5422, and
Converted to L level.

The output signals of these receivers 56 and 58 are selected by a selector 60, and the selection signal is output to a signal conversion circuit 62.

In the signal conversion circuit 62, NRZ (non-return
-to-zero)/NRZI (non-retur
The converted signal obtained by the signal conversion circuit 62 is sent from the driver 64 to the internal line 12 via the connector 52, and is sent to the cashier terminal 10-1゜10-. 2...10-n
received at

Further, the transmission signal given to the connector 52 of the communication adapter 2o from the cashier terminal 10-1, 10-2-, -10-n via the local line 12 is input to the receiver 66, and the TTL
converted to level.

Further, the output signal of the receiver 66 is input to a signal conversion circuit 68, and the signal conversion circuit 68 performs NRZ/NRZ I signal conversion in the opposite direction to that of the signal conversion circuit 62.

Since a data clock is required in this case, a clock oscillator 70 is provided in the signal conversion circuit 68.

The conversion signal output from this signal conversion circuit 68 is R32
Driver 72 for 32C and driver 74 for R9422
The output signals of the driver 72 and 74 are sent to the communication cable 18 via the connector 54.

As described above, the communication adapter 20 can function as an interface between the processing device 14 (personal computer) and the campus entrance &@12.

Since the communication adapter 20 is connected to the communication port 16 provided as standard on the main body 40 of the processing device 140, the same adapter can be used even if the model of the processing device 14 (personal computer) is different.

Further, the amount of change in the communication program executed by the processing device 40 depending on the model is extremely small.

Therefore, it is possible to reduce the labor and time required to develop the system, and the construction thereof can be significantly facilitated.

Furthermore, since the communication adapter 2o and the communication program can be standardized, it is also possible to reduce the cost of building the system.

There are two types of connectors 54 of the communication adapter 2o (R
3232C/R3422) (7) A processing device that can function as a system controller because it can be used for the communication cable 18! 4 (personal computer) from a wide range of models.

[Effects of the Invention] As explained above, according to the present invention, the processing device (personal computer) of the master station is connected by connecting the communication port that is standard equipment on the processing device (personal computer) and the local line with the communication adapter. communication port can be used to communicate with slave terminals.

Therefore, the same communication adapter can be used regardless of the type of processing device (personal computer).

As a result, it becomes unnecessary to newly develop a communication adapter and a communication program, and therefore it becomes possible to construct a system extremely easily and in a short time.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the principle of the invention, FIG. 2 is an explanatory diagram of the overall configuration of an embodiment, FIG. 3 is an explanatory diagram of the configuration of a communication adapter in the embodiment, and FIG. 4 is an explanatory diagram of the configuration of a conventional example. 18... Processing device body, ・・・Connector, W/Φ receiver, Selector, Signal conversion circuit, Driver, Receiver, Signal conversion circuit, Clock oscillator, ・・・Driver. 10-1.10-2--・10-n...Register terminal, 1
2...Internal line, 14...Processing device, 16...Communication port,

Claims (1)

[Claims] Terminals of slave stations (10-1, 10-2...10-n
) is connected to the premises line (12) and the premises line (12)
A processing device (14) of the master station that communicates with the terminals (10-1, 10-2...10-n) via a communication port (16) prepared in advance by the processing device (14).
The communication cable (18) connected to the
) and a communication adapter (20) to which the communication cable (18) is connected, and the communication adapter (20) transmits the signal sent from the communication port (16) of the processing device (14) to the communication cable (18). ), and the signal received by the first receiving means (22) is sent to the local area line (
a first conversion means (24) for converting the converted signal by the first conversion means (24) into a signal for the local area line (12);
) and a first transmitting means (26) for transmitting data to a terminal (10-1).
, 10-2...10-n) from the local area line (12); ) second signal converting means (30
) and the communication cable (
18) A communication system characterized by comprising: means (32) for transmitting data to 18).