JPS61175831A - Data equivalent controlling system - Google Patents

Abstract

PURPOSE:To obtain a data equivalent controlling system of high speed processing without interposing a host computer by executing equivalent processing of the contents of data files of a master terminal controller and a slave terminal controller, by the master terminal controller. CONSTITUTION:A master terminal controller 3 and a bus BUS2 of a slave terminal controller 4 are connected by a bus BUS3. The master terminal controller 3 inputs successively commodity sale information which is sent from a POS terminal 1 through a switching device 2, executes prescribed summing-up processing, also sends it to a slave terminal controller 4 side through the bus BUS3, and executes equivalent processing. The slave terminal controller 4 stores temporarily in a pool area 5 data for double write which is sent through the BUS3, and executes the same summing-up processing by reading out said data. The master and slave terminal controllers 3, 4 register a result of the summing-up processing in a file of a magnetic disk, etc.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a terminal controller for a terminal for collecting product information, and in particular, a method in which a plurality of terminal controllers are installed and data files on the plurality of terminal controllers are always kept equivalent. The present invention relates to a data equivalence control method for preventing loss of collected data due to terminal controller failure.

[Conventional technology]

Conventionally, POS (POS) using this type of product information gathering terminal (
Point Of 8ales) In the system, multiple PO8 terminals are connected to a host combiator via a common data bus and terminal controller. Terminal controller is multiple PO8
Product information supplied from the terminal is aggregated, filed, and sent to the host computer at the center.

In order to prevent data loss from the PO8 terminal in the event of a failure of the terminal controller, two terminal controllers are installed, and the first terminal controller is normally used for processing, but at the same time, product information is transferred to the second terminal controller. A duplex control method has been proposed in the past to supply the same power to the user.

Conventionally, such a data equivalence control method involves supplying product information from the PO8 terminal to the first terminal controller and also sending it to the host computer, and writing the same product information from the host computer to the second terminal computer. There is a method in which a second terminal combiator is also connected to the data bus of the PO8 terminal, and product information from the PO8 terminal is also written to the second terminal controller according to instructions from the host computer.

[Problem that the invention seeks to solve]

In this way, in this type of conventional data equivalence control method,
The host computer always intervenes when data is written twice, which has the drawback of increasing the load on the host computer and reducing processing speed.

Therefore, an object of the present invention is to provide a data equivalence control method that can perform high-speed processing without using a host computer.

[Failure to solve the problem]

According to the invention, a plurality of P
a switching device that includes an O8 terminal and first and second data buses that output information from these PO8 terminals, and switches the connection of the data bus from the PO8 terminal to either the first or second data bus; a parent terminal controller connected to a first data bus from the switching device; a child terminal controller having a pool area for data and connected to a second data bus; It has a bus that interconnects the terminal controller and the first data bus, and the parent terminal controller sequentially sends the received information to the child terminal controller side, and the child terminal controller temporarily stores the received information in a pool area. ,
After that, by reading the pool area t and performing predetermined processing, the stored information contents of the parent and child terminal controllers are maintained equally, and if the parent terminal controller fails, the data bus from the PO8 terminal is connected to the child terminal controller. A data equivalence control method is obtained that allows switching to the terminal controller side and continuing aggregation processing.

〔Example〕

Next, the present invention will be described in detail with reference to the drawings showing one embodiment of the present invention.

In Figure g1, a plurality of POS terminals 1 are connected to an automatic switching device 2 via a common serial bus SIB. The automatic switching device 2 switches the data transmission destination from the serial bus BUSC to the parent terminal controller 3 or the child terminal controller 24, but when the parent terminal controller 3 is operating normally, the serial bus BUSC is switched to the bus of the parent terminal controller 3. ,
Connected to BUSt.

The bus BU82 of the parent terminal controller 3 and child terminal controller 4 are connected by a bus BLJ83. The parent terminal controller 3 sequentially takes in the product sales information sent from the POS terminal 1 via the switching device 2, performs predetermined aggregation processing, and
Send it to the child terminal controller 4 side via TJ83t (equivalent processing).

The child terminal controller 4 stores the data for double writing sent via the BU 83 in a temporary pool area 5.
By reading out this area 5, similar aggregation processing is performed. Parent and child terminal controller 3,
4 has a file device (not shown) such as a magnetic disk device, and the results of the aggregation process are registered here.

The parent and child terminal controllers 3 and 4 are further connected to a control line C0NI for monitoring each other's faults and control lines CON2 and C0N3 for controlling switching of the automatic switching device 2. -73 failure, the information accumulated in the child terminal controller 4 is transferred to the parent terminal controller 3 via the data bus BU84' after the parent terminal controller 3 is restored. At this time,
The parent terminal controller 3 only needs to copy the information sent via the BU 84 to its own file device.

Next, referring to FIG. 2, the PO configured as described above will be explained.
The processing flow of the 8 system will be explained below.

First, product sales information is registered on the PO8 terminal l (al. At this time, it is assumed that both the parent and child terminal controllers 3 and 4 are started. Therefore, the automatic switching device 2 is connected to the parent terminal controller 3. Next, check whether the parent and child terminal controllers 3 and 4 are down (tb>, fc). If the parent is normal, the information is registered in the parent terminal controller 3 (d) and isometric processing (k) is performed at the same time. Then, it is checked whether there is any abnormality due to the parent's down monitoring (g), and if there is no abnormality, the process returns to the beginning and performs the next product sales information registration process (al).This operation is repeated.

If an abnormality is confirmed by down monitoring (q), the child controller 4 sends a switching signal C0N5t to the automatic switching device 2.
- Send. As a result, BUSC automatically switches to the slave side. Therefore, the aggregation process continues as is (t
r)-+(a)-+(b)-+(C)→(e)→(h)
)O However, at this time, equal image processing of parent and child ((k),
Since (su, -) is not performed, it is necessary to restore the parent terminal controller at an early point.

Now, if an abnormality occurs during equivalence processing or while registering information to the child terminal controller (0), (h) the child is considered to be down (p) e U). At this time, if the parent is also down, the (r) e (q) system will be down.

〔Effect of the invention〕

As explained above, the present invention provides data equivalency processing that enables high-speed processing without requiring the intervention of a host computer, by allowing the parent terminal controller to perform equalization processing on the contents of data files of the parent terminal controller and child terminal controller. A processing system can be realized.

[Brief explanation of drawings]

Claims (1)

[Claims] A plurality of terminal devices connected to a common data bus, and a first and second data bus for transmitting information from the terminal devices, the common data bus and either of the first and second data buses. a switching device connected to the first and second data buses, a parent terminal controller that performs predetermined processing on information from the terminal device and stores it; It has a child terminal controller that performs the same processing as the parent terminal controller, and when the parent terminal controller is operating normally, the switching device controls the connection between the common bus and the first data bus, and also controls the switching device to connect the common bus and the first data bus. The terminal controller sends information from the terminal device to the child terminal controller via the second data bus, and when a failure occurs in the parent terminal controller, the switching device transfers the information from the common bus to the second data bus. A data equivalence control method characterized by connection with a bus.