JPH05324513A - Merchandise sale data processor - Google Patents

Abstract

PURPOSE:To easily specify the position of the occurrence of communication abnormality on the side of a high-order processor in the case that a close loop is not formed by the disconnection of a transmission line or the like and bring about the communication abnormality by providing the high-order processor with a line abnormality detecting means and providing each terminal machine with a line abnormality massage communication means. CONSTITUTION:POS terminals 2-1 to 2-n are distributed to respective sales rooms in a shop, and a field processor 1 is installed in the office or the like of this shop, and a store processor 5 is installed in a head office managing the shops. If disconnection occurs between the uppermost terminal 2-1 and the next terminal 2-2, a line abnormality message for which TM number #2 is set is transmitted from the terminal 2-2 to the processor 1. Further, the line abnormality is reported to the processor 5, and TM number #2 of the terminal 2-2 or the like is displayed on the display part of the processor 5. Thus, a person in charge of system management who is standing by in the head office recognizes the occurrence of the line abnormality due to the disconnection or the like at the upstream of the terminal 202 by display contents.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a product sales data processing device called a POS (point of sale information management) system adopted in supermarkets, convenience stores and the like.

[0002]

2. Description of the Related Art Generally, in a POS system, a plurality of commodity sales data registration terminals called POS terminals and one host processor called a file processor are provided, for example, in SDLC (synchronous data).・ Link control) A transmission line such as a line is connected in a closed loop, and the data sent from the upper processor is sent in sequence from the upstream terminal to the downstream terminal, and the downstream terminal to the upper processor. It is configured to reply.

In this type of POS system, as a conventional technique for detecting a location where a communication abnormality occurs, for example, a technique disclosed in Japanese Patent Laid-Open No. 01-130276 is known. In the technique of this publication, when the upper processor recognizes the occurrence of a line abnormality, it transmits an abnormality command in order from the upstream side to the downstream side of the terminal. When the terminal receives the abnormal command, the terminal outputs a message indicating that the communication is abnormal to the display unit or the like.

Therefore, when a communication abnormality occurs, the abnormality output is performed to the terminal device immediately before the abnormality portion, so that the abnormality portion can be specified.

Further, the technique disclosed in Japanese Patent Laid-Open No. 63-24456 is a means for notifying a line abnormality when detecting an abnormality in a received signal input to each terminal through an input terminal connected to a transmission line. A means for notifying a terminal abnormality when detecting an abnormality in a transmission signal output through an output terminal connected to the transmission line and for short-circuiting the input terminal and the output terminal. ..

Therefore, when a communication error occurs due to a disconnection of the line, an abnormality of the received signal is detected by the terminal device after the abnormal point and the line abnormality is notified, so that the abnormal point can be specified. In addition, when a transmission error occurs due to a terminal failure, the abnormal terminal notifies the abnormal transmission, so that the abnormal terminal can be identified and the abnormal terminal is automatically disconnected from the transmission line. , Closed loop is retained.

[0007]

However, in any of the techniques of the prior art publications, when a communication error occurs due to a disconnection of the closed loop or a failure of the terminal, the abnormality notification output of the corresponding terminal is confirmed. Otherwise, the abnormal part could not be identified. For this reason, when the system management person recognizes the occurrence of a communication abnormality, he has to go around the store and check the output contents of each terminal to identify the location of the abnormality, which is troublesome.

Therefore, the present invention provides a product sales data processing device in which, when a closed loop is not formed due to a disconnection of a transmission line or the like and a communication abnormality occurs, the location of the abnormality can be easily specified on the upper processor side. Is what you are trying to do.

Further, according to the present invention, when a terminal forming a closed loop is disconnected from a transmission line due to a failure or the like, the abnormal terminal can be easily identified on the upper processor side. An object is to provide a data processing device.

[0010]

The invention according to claim 1 is
A plurality of product sales data registration terminals each assigned a unique terminal number and one upper processor are connected in a closed loop by a transmission line, and the data sent from the upper processor is connected to the upstream terminal. From the downstream terminal to the upstream terminal, the upstream processor sends a loop check from the upstream terminal to the downstream terminal in a predetermined cycle. Check message sending means for sending a message for receiving a message, reception waiting means for waiting for data reception from the most downstream terminal every time a message for loop check is sent by this sending means, and waiting for reception by this waiting means When a line error message is received from the most downstream terminal, the line error notification is sent based on the terminal number embedded in the received message. Each of the terminals is provided with a stage, and each terminal detects non-reception detecting means for detecting no reception of the loop check message periodically transmitted from the upper processor, and this detecting means detects no reception of the loop check message. Then, the terminal number assigned to the corresponding terminal is incorporated into a predetermined line error message and the line error message is transmitted to the upper processor via the transmission line. is there.

According to a second aspect of the present invention, a plurality of commodity sales data registration terminals, each of which is assigned a unique terminal number, and one upper processor are connected in a closed loop via a transmission line, The data sent from the processor is sent in sequence from the upstream terminal to the downstream terminal,
In a product sales data processing device that sends a reply from a most downstream terminal to an upper processor, the upper processor includes a terminal number storage unit that stores a terminal number assigned to each terminal and an upstream terminal at a predetermined cycle. Check message sending means for sending the loop check message in sequence from the device to the downstream terminal, and reception waiting for data reception from the most downstream terminal device every time the loop check message is sent by this sending means. When a loop check message is received from the most downstream terminal while waiting for reception by this waiting means, the terminal number added to the received message is compared with the terminal number stored by the storage means. Number comparing means and the terminal number not added to the received message are detected by this comparing means, the abnormality occurrence of the terminal to which the terminal number is assigned is notified. And a terminal receiving means for receiving a loop check message that is periodically transmitted from the host processor via a signal input unit connected to the transmission line, When a loop check message is received by this receiving means, the check message is added to the message and the terminal number assigned to the corresponding terminal is transmitted to the downstream side via the signal output section connected to the transmission line. The transmission means, the transmission abnormality detection means for detecting an abnormality of the transmission signal transmitted via the signal output portion, and the abnormality detection output by the abnormality detection means short-circuits the signal input portion and the signal output portion to cause the corresponding terminal And an off-line means for disconnecting the machine from the transmission line.

[0012]

According to the invention of claim 1, the host processor sends the loop check message from the upstream terminal to the downstream terminal in a predetermined cycle, and the loop check message is sent to each terminal. Whether or not a sentence is received is constantly checked.

Here, when a closed loop is not formed due to a disconnection of the transmission line and a communication abnormality occurs, the above-mentioned loop check message can be received up to the terminal immediately before the location of the abnormality, but thereafter. The above terminal cannot receive the above loop check message.

Then, from the terminal which cannot receive the loop check message, a line abnormality message in which the terminal number assigned to the corresponding terminal is set is transmitted to the upper processor via the transmission line, The upper processor notifies the line abnormality based on the terminal number in the received line abnormality message. As a result, it becomes possible for the upper processor side to specify the location where the communication abnormality has occurred.

Also in the invention according to claim 2, a loop check message is sent from the upstream processor to the downstream terminal in a predetermined cycle in a predetermined cycle, and the loop check is performed at each terminal. Whether or not a message has been received is constantly checked. When the loop check message is received via the signal input unit connected to the transmission line, the received message is added with the terminal number assigned to the corresponding terminal, and then It is transmitted to the downstream side via the signal output unit connected to the transmission line.

When an abnormality of the transmission signal transmitted through the signal output unit is detected in each terminal, the signal input unit connected to the transmission line and the signal output unit are short-circuited. The corresponding terminal is disconnected from the transmission line.

Therefore, when no failure occurs in each terminal, the terminal number of each terminal is sequentially added to the loop check message returned from the most downstream terminal to the upper processor. The terminal number of each terminal is stored in advance in the host processor.In normal operation, the terminal number stored in the host processor and the terminal number string added to the loop check message returned to the host processor. Matches with.

However, when a certain terminal is disconnected from the transmission line due to a failure or the like, the terminal number string separated from the terminal number string added to the loop check message returned to the upper processor is The number is missing, and the upper processor is notified of the occurrence of an abnormality in the terminal whose number is missing. This enables the host processor side to identify the abnormal terminal disconnected from the transmission line.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment P to which the present invention is applied.
1 is an overall view of an OS system. This POS system is
File processor 1 as one host processor
In addition, as a terminal for registering multiple product sales data,
The S terminals 2-1, 2-2, ..., 2-n are connected in a closed loop by an SDLC line 3 as a transmission line.

Each POS terminal 2-1, 2-2, ..., 2-n
Has a TM as a unique terminal number.
(Terminal) numbers # 1, # 2, ..., #n are assigned and set in the storage device inside the terminal.

The file processor 1 is connected to a store processor 5 composed of a host computer or the like via a private line 4 such as a public line or ISDN (Integrated Services Digital Network).

Each POS terminal 2-1, 2-2, ..., 2-n
Are installed in each of the sales floors of the store, the file processor 1 is installed in the office of the store, and the store processor 5 is installed in the headquarters that manages the store.

FIG. 2 is a block diagram showing a schematic configuration of the store processor 5. This store processor 5
A CPU (Central Processing Unit) 51 that constitutes the main body of the control unit, a ROM (Read Only Memory) 52 in which program data and the like executed by the CPU 51 are stored in advance, and each PO
RAM (random access memory) in which various memory areas are formed for collecting and totaling the product sales data registered for sale at the S terminals 2-1, 2-2, ..., 2-n via the file processor 1. ) 53, a communication controller 54 for controlling data transmission / reception performed via the public line or the dedicated line 4, and a plurality of I / O ports 55, 5
6 and 57 are connected to each other by a bus line 58.

The I / O port 55 is a keyboard 55a
, The I / O port 56 is connected to the display unit 56a, and the I / O port 57 is connected to the buzzer 58.

FIG. 3 is a block diagram showing a schematic configuration of the file processor 1. This file processor 1
Is a CPU 11 constituting the control unit main body, the CPU 11
ROM in which program data to be executed by
12, particularly RAM 1 in which a normal order area 13a of TM numbers and a current order area 13b are formed as shown in FIG.
3, a clock unit 14 for measuring the date and time, a communication controller 15 for controlling the transmission / reception of data performed via the public line or the dedicated line 4, and a loop controller 1 for controlling the transmission / reception of data performed via the SDLC line 3.
6 are connected to each other by a bus line 17.

FIG. 5 shows the POS terminals 2-1, 2-2,
, 2-n is a block diagram showing a schematic configuration. These P
Each of the OS terminals 2-1, 2-2, ..., 2-n has a CPU 21 that constitutes the main body of the control unit, a ROM 22 in which program data executed by the CPU 21 and a corresponding TM number are stored in advance, and product sales data. RAM 23 in which various memory areas for performing registration processing are formed, and the SDL
A loop controller 24 and a plurality of I / O ports 25, 2 for controlling data transmission / reception performed via the C line 3.
6 and 27, which are interconnected by a bus line 28.

The I / O port 25 is a keyboard 25a
, The I / O port 26 is connected to the display unit 26a, and the I / O port 27 is connected to the printer 28.

Also, each POS terminal 2-1, 2-2,
..., 2-n are a pair of two-contact changeover switches 29a, 29b
It has a relay circuit 29 provided with, a receiver 201 for receiving a data signal, a driver 202 for transmitting a data signal, and a transmission abnormality detection circuit 203.

One switch 29a of the relay circuit 29 has its fixed contact c connected to the upstream side 3a of the SDLC line 3 and its normally closed contact b connected to the input end of the receiver 201. The other changeover switch 29b of the relay circuit 29 has its fixed contact c connected to the downstream side 3b of the SDLC line 3 and its normally closed contact b connected to the driver 2
02 is connected to the output terminal. Both changeover switches 29a,
The normally open contacts a, a of 29b are short-circuited.

The output end of the receiver 201 is connected to the loop controller 24 and also to one input end of the transmission abnormality detection circuit 203. The input end of the driver 202 is connected to the loop controller 24 and the other input end of the transmission abnormality detection circuit 203.

The transmission abnormality detection circuit 203 transmits a transmission signal based on the output data signal from the receiver 201 input to one input end and the input data signal to the driver 202 input to the other input end. Is detected and the abnormality detection output is given to the relay circuit 29 to switch the variable contacts of the pair of changeover switches 29a and 29b from the normally closed side b to the normally open side a.

Here, one relay switch 29a of the relay circuit 29 and the receiver 201 constitute a signal input section 204, and the other relay switch 29b and the driver 202.
And constitute the signal output unit 205. Further, the transmission abnormality detection circuit 203 constitutes transmission abnormality detection means for detecting an abnormality in the transmission signal transmitted via the signal output unit 204,
The relay circuit 29 constitutes an off-line means for disconnecting the corresponding terminal from the SDLC line 3 by short-circuiting the signal input section 204 and the signal output section 205 by the abnormality detection output of the transmission abnormality detection means.

Then, C of the file processor 1
The PU 11 is program-controlled so as to particularly execute the processing shown in FIG. 6 after the power is turned on. That is, when the power is turned on and the power is turned on, the loop controller 16 is controlled in step ST1 to sequentially transmit the loop check message from the upstream POS terminal 2-1 to the downstream POS terminal 2-1. After sending, the most downstream P in ST2
Wait for message reception from OS terminal 2-n. When the loop check message is received in ST3, the TM number sequence added to the received message is stored in the normal order area 13a of the RAM 13 in ST4.

Here, the RAM 1 of the file processor 1
The normal order area 13a formed in No. 3 is the T assigned to each POS terminal 2-1, 2-2, ..., 2-n.
A terminal number storage means for storing the M number is configured.

Next, when the CPU 11 detects that 60 seconds have passed in ST5, it again controls the loop controller 16 in ST6 to send the loop check message to the upstream PO.
Send from the S terminal 2-1 to the downstream POS terminal in order. After the transmission, in ST7, it waits for the reception of a message from the downstream POS terminal 2-n. When the loop check message is received in ST8, the TM number string added to the received message is stored in the RAM in ST9.
It is stored in the present order area 13b of No. 13.

Next, in ST10, the contents of the normal order area 13a of the RAM 13 and the contents of the current order area 13b are compared. If a TM number that is stored in the normal order area 13a but is not stored in the current order area is detected, a terminal error is detected from the missing TM number in ST11 and the contents of the normal order area 13a. Create notification message. Then, it controls the communication controller 15 to transmit the abnormality notification message to the store processor 5 via the public line or the dedicated line 4.

After that, returning to ST5, if the lapse of 60 seconds is detected, the loop check message is transmitted again in ST6, and the reception from the most downstream POS terminal 2-n is waited in ST7.

Here, when the loop check message is received from the most downstream POS terminal 2-n in ST8, the same process as above is repeated.

On the other hand, when the line abnormality notification message is received from the POS terminal 2-n at the most downstream in ST12, the line error is detected from the TM number in the message and the contents of the normal order area 13a in ST13. Create notification message.
Then, it controls the communication controller 15 to transmit the abnormality notification message to the store processor 5 via the public line or the dedicated line 4.

Thereafter, the process returns to ST5, and if the elapse of 60 seconds is detected, the loop check message is transmitted again at ST6 and the above process is repeated.

Here, the CP of the file processor 1
U11 constitutes a check message transmitting means for transmitting the loop check message in sequence from the upstream POS terminal to the downstream POS terminal at a predetermined cycle in the processes of ST5 and ST6, and in the process of ST7, loops by this transmitting device. Each time a check message is transmitted, reception waiting means for waiting for data reception from the most downstream POS terminal is configured.

Further, the CPU 11 uses ST8, ST9 and S.
When the loop check message is received from the most downstream POS terminal by the waiting means in the processing of T10 while waiting for the reception, the TM number added to the received message and the TM number stored in the normal order area 13a are displayed. Comprising number comparing means for comparing, if the TM number not added to the received message is detected by the comparing means in the processing of ST11, the terminal abnormality notifying means for notifying the occurrence of abnormality of the POS terminal to which the TM number is assigned Make up.

Further, the CPU 11 uses ST12 and ST13.
When a line abnormality message is received from the most downstream POS terminal 2-n while the reception standby unit is waiting for reception in the processing of the above, the line abnormality notifying unit notifies the line abnormality based on the TM number incorporated in the received message. Make up.

Each of the POS terminals 2-1, 2-2, ...
The 2-n CPU 21 is program-controlled so as to execute the processing shown in FIG. 7 in particular when the power of the file processor 1 is turned on and the closed loop by the SDLC line 3 is established.

First, in ST1 and ST2, it is determined whether or not a message is received by the loop controller 24 within a preset period of X seconds. The set period X seconds is set to be twice or more longer than the transmission period (60 seconds in this case) of the loop check message periodically transmitted from the file processor 1.

If no message can be received within the period of X seconds in ST2, the upstream SDLC line 3
It is judged that a communication error has occurred due to the disconnection of a, and S
At T3, the loop controller 24 is controlled to transmit the line abnormality message in which the own TM number is set to the SDLC line 3b on the downstream side via the driver 202. Then ST1
Return to processing.

On the other hand, if a message is received within X seconds in ST1, and the received message is the loop check message in ST4, the received loop check message is added in ST5. After adding its own TM number, the loop check message is sent to the SDL on the downstream side via the driver 202.
Send to C line 3b. Then, the process returns to ST1.

If a message is received within X seconds in ST1, the received message is not the loop check message in ST4, and the line abnormality message is in ST6, ST7 is received.
Then, the received line error message is directly sent to the driver 202.
Via the SDLC line 3b on the downstream side. Then, the process returns to ST1.

Here, each POS terminal 2-1, 2-2,
The 2-n CPU 21 receives the loop check message periodically transmitted from the file processor 1 in the processes of ST1 and ST2 via the signal input unit 204 connected to the SDLC line 3. The sentence receiving means and the non-reception detecting means for detecting no reception of the loop check message periodically transmitted from the file processor 1 are configured.

When the non-reception detecting means detects that no loop check message has been received, the CPU 21 assigns the TM to the corresponding POS terminal.
A number is incorporated in a predetermined line abnormality message, and the line abnormality message is transmitted via the SDLC line 3 to the file processor 1
It constitutes a line abnormality message transmission means for transmitting to.

Further, when the CPU 21 receives the loop check message by the message receiving means, the CPU 21 adds the TM number assigned to the corresponding POS terminal to the message and outputs the signal output section 205 connected to the SDLC line 3. The check message transmitting means for transmitting the check message to the downstream side via the.

The store processor 5 is program-controlled to execute the processing shown in FIG. That is, in ST1, the communication controller 54 waits for the message transmitted from the file processor 1 to be received, and in ST2, when the line abnormality notification message is received, the buzzer 57a is sounded and The TM number in the received message and the normal TM number string are displayed on the display unit 56a.

When the terminal abnormality notification message is received in ST3, the buzzer 57a is sounded and the TM number and the normal TM number string in the received message are displayed on the display unit 56a.

When the store processor 5 has a printer, the TM number and the normal TM number sequence in the received message may be printed out on the recording paper by the printer.

In the present embodiment configured as described above, the file processor 1 and each POS terminal 2-
The power of 1, 2-2, ..., 2-n is turned on, and the SDLC line 3
When the closed loop is established by the file processor 1,
Sends the loop check message to the upstream POS terminal 2-1
To send to the downstream POS terminal in order.

PO receiving this loop check message
Each of the S terminals 2-1, 2-2, ..., 2-n adds a unique TM number assigned to itself to the loop check message and transmits it further downstream.

Therefore, this loop check message is used for each POS terminal 2-1, 2-2, ..., 2 forming a closed loop.
The TM numbers # 1, # 2, ..., #n of -n are added in order from the most upstream terminal, and returned to the file processor 1 from the most downstream POS terminal 2-n. Therefore,
The file processor 1 stores the TM number string in the normal order area 13a of the RAM 13.

After that, 60 from the file processor 1
The loop check message is repeatedly transmitted in the same manner as above at a cycle of seconds.

Here, no communication abnormality such as disconnection has occurred in the SDLC line 3 forming a closed loop, and each POS
Terminals 2-1, 2-2, ..., 2-n are also SD due to failure etc.
If not disconnected from the LC line 3, each POS
TM numbers # 1 and # of terminals 2-1, 2-2, ..., 2-n
A loop check message in which 2, ..., #n are sequentially added from the most upstream terminal is returned from the most downstream POS terminal 2-n to the file processor 1.

At this time, since the contents of the current order area 13b and the contents of the normal order area 13a match, the terminal abnormality notification message is not sent to the store processor 5. In addition, each POS terminal 2-1, 2-2, ...,
Since the line abnormality message is not transmitted from 2-n, the line abnormality notification message is not transmitted to the store processor 5.

On the other hand, when a communication abnormality such as a disconnection occurs in the SDLC line 3 and the closed loop is not formed, the file processor 1 periodically transmits the POS terminal upstream of the abnormality occurrence point. The loop check message can be received within a predetermined time X seconds, but the loop check message cannot be received at the downstream POS terminal.

As a result, from the POS terminal that cannot receive the loop check message, the TM of its own is received.
The line error message with the set number is sent to the downstream side. However, the downstream POS closest to the location where the abnormality occurred
When the terminal sends a line error message, the POS terminal on the downstream side receives the line error message within a predetermined time X seconds, so the line error message is sent from the downstream POS terminal closest to the location where the error occurred. Will only be sent.

In this way, when the line abnormality message in which the own TM number is set is transmitted to the downstream side from the downstream POS terminal closest to the location where the abnormality has occurred, this line abnormality message is received by the file processor 1. .. As a result, the file processor 1 notifies the store processor 5 of a line abnormality, and in the store processor 5, a buzzer for notifying the line abnormality sounds, and the TM number of the downstream POS terminal closest to the location where the abnormality occurs and the TM at normal time. The number string and is displayed or printed out.

For example, when a disconnection occurs between the most upstream POS terminal 2-1 and the next POS terminal 2-2, a line error message with the TM number # 2 set from the POS terminal 2-2. Sent to file processor 1,
Furthermore, a line abnormality notification is sent to the store processor 5,
The TM number # 2 or the like of the POS terminal 2-2 is displayed on the display section 56a of the store processor 5. As a result, the person in charge of system management who was on standby at the headquarters could change from the displayed content to P
It is possible to recognize that a line abnormality has occurred due to a disconnection or the like on the upstream side of the OS terminal 2-2.

When a message is received at a certain POS terminal but a response corresponding to the received message cannot be output and the transmission error detection circuit 203 of the terminal detects a transmission error, In response to the abnormality detection output of the detection circuit 203, each changeover switch 29a, 29b of the relay circuit 29 of the terminal is switched from the normally closed side b side to the normally opened side a side. As a result, the terminal is automatically disconnected from the SDLC line 3 and the closed loop by the SDLC line 3 is maintained.

Therefore, the loop check message periodically transmitted from the file processor 1 is returned to the file processor 1 from the POS terminal on the most downstream side. From the TM number string added to the loop check message at this time, Indicates that the TM number of the separated POS terminal is missing as compared with the TM number string stored in the normal order area 13a.

At this time, the file processor 1 transmits to the store processor 5 the terminal abnormality notification message in which the missing TM number is set, and the store processor 5 sounds a buzzer for notifying the terminal abnormality and disconnects it. The TM number of the POS terminal and the TM number string in the normal state are displayed or printed out.

For example, when the POS terminal 2-2 detects a transmission error and disconnects from the SDLC line 3, the loop check message transmitted from the file processor 1 immediately after that is the TM number # of the POS terminal 2-2. 2 is returned to the file processor 1 without being added, the store processor 5 is notified of a terminal abnormality, and the T of the POS terminal 2-2 is displayed on the display portion 56a of the store processor 5.
The M number # 2 is displayed. As a result, the system administrator in standby at the headquarters can recognize from the displayed contents that the POS terminal 2-2 has been disconnected from the SDLC line 3 due to a failure.

In the above embodiment, an example in which the file processor 1 sends an error notification message to the store processor 5 when a line error occurs or a terminal error occurs to give an error notification, is displayed on the file processor 1. When an output device such as a printer and a printer is provided, the abnormality notification may be performed using the output device.

Further, in the above embodiment, when the closed loop is not formed due to the disconnection of the line or the like, the line abnormality message is transmitted only from the POS terminal located immediately after the abnormal point. However, it is assumed that the line abnormality message is transmitted from all the POS terminals located on the downstream side of the abnormality occurrence point, and the line abnormality message transmitted from the most upstream POS terminal in the file processor 1 is extracted and stored in the store processor. 5 may be notified of the abnormality. Of course, various modifications can be made without departing from the scope of the present invention.

[0072]

As described in detail above, according to the invention according to claim 1, when a closed loop is not formed due to a disconnection of a transmission line or the like and a communication abnormality occurs, the location where the abnormality occurs can be easily performed on the upper processor side. It is possible to provide a product sales data processing device which can be specified as follows.

According to the second aspect of the invention, when the terminal forming the closed loop is disconnected from the transmission line due to a failure or the like, the abnormal terminal can be easily identified by the upper processor side. It is possible to provide a merchandise sales data processing device.

[Brief description of drawings]

FIG. 1 is an overall view of a POS system that is an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a store processor in the embodiment.

FIG. 3 is a block diagram showing a configuration of a file processor in the embodiment.

FIG. 4 is a diagram showing a main memory configuration formed in a RAM of the file processor.

FIG. 5 is a block diagram showing the configuration of a POS terminal in the same embodiment.

FIG. 6 is a flowchart showing the main processing executed by the CPU of the file processor.

FIG. 7 is a flowchart showing main processing executed by the CPU of the POS terminal.

FIG. 8 is a flowchart showing main processing executed by the CPU of the store processor.

[Explanation of Codes] 1 ... File processor, 2-1 to 2-n ... POS terminal, 3 ... SDLC line, 5 ... Store processor, 13a
... Normal order area, 13b ... Current order area, 203 ...
Transmission error detection circuit.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical indication H04L 12/42

Claims (2)

[Claims] 1. Data sent from a host processor in which a plurality of product sales data registration terminals, each of which is assigned a unique terminal number, and a host processor are connected in a closed loop via a transmission line. In the product sales data processing device for sequentially transmitting from the upstream terminal to the downstream terminal, and returning from the most downstream terminal to the upper processor, the upper processor is a predetermined cycle from the upstream terminal to the downstream. Check message sending means for sending the loop check message to the terminal in sequence, and waiting to receive data from the most downstream terminal every time the loop check message is sent by this sending means. Means for receiving the line abnormality message from the most downstream terminal device while waiting for reception by this means, based on the terminal number incorporated in the received message. A line-abnormality notifying means for notifying a line abnormality by means of the non-reception detecting means for detecting no reception of the loop check message periodically transmitted from the upper processor, When the reception of the loop check message is detected by the means, the terminal number assigned to the corresponding terminal is incorporated into a predetermined line error message, and the line error message is passed through the transmission line to the upper processor. A product sales data processing device, comprising: a line abnormality message sending means for sending to 2. Data sent from a host processor by connecting a plurality of product sales data registration terminals to which a unique terminal number is assigned and one host processor in a closed loop with a transmission line. In the product sales data processing device for sequentially transmitting from the upstream terminal to the downstream terminal, and returning from the most downstream terminal to the upper processor, the upper processor is a terminal assigned to each terminal. A terminal number storage means for storing a number, and a check message transmission means for sequentially transmitting a loop check message from the upstream terminal to the downstream terminal at a predetermined cycle,
Each time the transmission means transmits a loop check message, the reception standby means waits for data reception from the most downstream terminal, and the standby means performs the loop check from the most downstream terminal while waiting for reception. Number comparison means for comparing the terminal number added to the received message with the terminal number stored by the storage means when the message is received, and the terminal not added to the received message by this comparing means And a terminal abnormality notifying means for notifying an abnormality occurrence of the terminal to which the terminal number is assigned when the terminal number is detected, and each terminal is for loop check periodically transmitted from the upper processor. A message receiving means for receiving a message via a signal input unit connected to the transmission line, and a terminal corresponding to the message when a loop check message is received by this receiving means. Check message transmitting means for adding the terminal number assigned to the transmission line to the downstream side through the signal output unit connected to the transmission line, and an abnormality in the transmission signal transmitted through the signal output unit The transmission abnormality detecting means for detecting the error, and the off-line means for disconnecting the terminal from the transmission line by short-circuiting the signal input portion and the signal output portion by the abnormality detection output by the transmission abnormality detecting means. A product sales data processing device characterized by the above.