JPH0719696A - Communication control device of refrigerator - Google Patents

Abstract

PURPOSE:To obtain a communication control device of a refrigerator which enables execution of stable communication irrespective of a delay operation of a transmission-reception control signal caused by the delay characteristic of a noise intercepting part and the characteristics of a totalizing unit, in regard to the communication control device of the refrigerator which is provided between the totalizing unit and a terminal unit of the refrigerator and equipped with a converting part of a communication voltage between the totalizing unit and the terminal unit of the refrigerator, the noise intercepting part constructed of optical elements and a transmission-reception control part. CONSTITUTION:This device is constructed of a converting part 7 of a communication voltage between a totalizing unit 1 and a terminal unit 5 of a refrigerator, a noise intercepting part 8 and a transmission-reception control part 6b constructed basically of CPU 15, ROM 17 and a serial port 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator communication control device for controlling a data request signal of a totalizer and refrigerator information data in a refrigerator centralized charge control system for hotels and inns.

[0002]

2. Description of the Related Art Conventionally, a refrigerator communication control device of this type has been disclosed in Japanese Patent Laid-Open No. 62-59370.
It has a function of mutually converting the communication standard of a counting machine such as a personal computer and the communication standard of a refrigerator terminal, and a function of performing switching control of transmission / reception signals, and control technology of this transmission / reception signal switching timing is important. is there.

A refrigerator communication control device as described above will be described below with reference to the drawings.

FIG. 3 is a block diagram of a conventional refrigerator communication control device, and FIG. 4 is a timing diagram of a conventional data request signal, refrigerator information data signal, and transmission / reception control signal.

Reference numeral 1 is a totaling machine, 2 is a serial interface which is standardly installed inside the totaling machine, 3 is a refrigerator communication control device, 4 is a refrigerator, and 5 is a refrigerator terminal device for transmitting charging information of the refrigerator to the totaling machine. When sending out the data request signal 11 (hereinafter referred to as TX) to the refrigerator terminal 5 from the serial interface 2, the counting machine 1 uses the transmission / reception control unit 6a built in the counting machine 1 to transmit / receive the control signal 14a (hereinafter R).
(TS) is changed from'H 'to'L'.

The RTS 14a passes through a communication voltage converter 7 and a noise blocker 8 and then a driver 9 and a receiver 10.
And the driver 9 is turned on and the receiver 10 is turned off. The TX 11 is also sent to the refrigerator terminal from the driver 9 via the same route.

At this time, since the receiver 10 is in the cutoff state, the TX 9 does not flow back to the counting machine 1 side. After this, the aggregator 1 detects the terminal symbol 13a of the TX11 at the same time as the transmission of the TX11 is completed, and the transmission / reception control unit 6a sends an RT
S is changed from “L” to “H” to turn off the driver 9 and turn on the receiver 10.

On the other hand, the refrigerator terminal 5 is a T from the totalizer 1.
X11 is received and the refrigerator information data signal 12 (hereinafter RX
Said). This RX12 is a receiver 10,
It reaches the totalizer 1 through the noise blocker 8 and the communication voltage converter. The aggregator 1 detects the terminal symbol 13b of the RX 12, ends the reception operation, and shifts to the transmission operation after the arithmetic processing.

[0009]

However, in the above-mentioned structure, when a general-purpose optical element having a large delay response is used for the noise blocking section, the transmission / reception control signal 14 shown in FIG. 4 is used.
As shown in b, the RTS waveform is delayed as compared with the RX response, and a normal reception operation cannot be performed. Also, after the personal computer used as the totalizer sends TX, R
Since the time to change TS from'L 'to'H' is delayed depending on the hardware and software of the personal computer, depending on the model of the aggregator used, a double delay occurs in addition to the above delay, which is stable. There was a problem that communication was not possible.

The present invention has been made in view of the above problems, and provides a refrigerator communication control device capable of stable communication regardless of the above delay factors.

[0011]

In order to solve the above-mentioned problems, the present invention comprises a noise blocking section formed of an optical element and a transmission / reception control section for switching a transmission / reception signal.

Further, the transmission / reception control unit detects the end code of the data request signal of the totalizer and the refrigerator information data signal and controls transmission / reception.

[0013]

The present invention has the above-described structure, and the RTS resulting from the characteristics of the noise blocking unit and the totalizer of the refrigerator communication control device.
Stable communication can be performed regardless of the delay.

[0014]

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2.

Reference numeral 1 is a totaling machine, 2 is a serial interface, 3 is a refrigerator communication control device, 4 is a refrigerator, 5 is a refrigerator terminal device, 7 is a communication voltage conversion unit, and 8 is a noise blocking unit. , 9 is a driver, 10 is a receiver, 11 is a data request signal (TX), 12 is a refrigerator information data signal (RX), 13a is a terminal symbol of TX,
Numeral 13b is a terminal symbol of RX. Since the above has the same function as the conventional example, the same numeral is given and its detailed description is omitted.

Reference numeral 6b is a transmission / reception control unit, and the CPU 15 controls the serial port 16 according to a program written in the ROM 17. The input terminal of the serial port 16 is connected to the input side of the driver 9 and the output side of the receiver 10, and monitors the presence or absence of each signal of TX11 and RX12.

Turn the driver 9 and receiver 10 ON / O
The initial value of the transmission / reception control signal 14c (hereinafter referred to as RTS) for FF control is'L ', and the driver 9 is in the conductive state and the receiver is in the cutoff state, and is in the TX signal waiting state.

Next, through the serial port 16, TX11
Is detected, and when the termination code 13a is detected, C
The PU 15 sets the RTS 14c of the serial port 16 to "L".
To'H ', the driver 9 is turned off, the receiver 10 is turned on, and the RX signal waiting state is entered.
The termination code of the RX 12 is detected and the RTS 14c is changed from "H" to "L" again to enter the TX waiting state. Also, R
When X12 does not respond, RTS is forced after a certain time.
14c is set to'L 'to enter the TX waiting state.

As in the above embodiments, the transmission / reception control unit provided in the refrigerator communication control device detects the termination codes of TX and RX to perform transmission / reception control. The stable communication can be performed without being affected by the delay of the RTS signal.

[0020]

As described above, according to the present invention, the refrigerator communication control device capable of performing stable communication regardless of the RTS delay caused by the characteristics of the noise blocking unit and the totalizer of the refrigerator communication control device is constructed by the above-described configuration. It is provided.

[Brief description of drawings]

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

FIG. 2 is a timing diagram of an embodiment of the present invention.

FIG. 3 is a block diagram of a conventional example.

FIG. 4 is a timing chart of a conventional example.

[Explanation of symbols]

 1 Aggregator 3 Refrigerator communication controller 4 Refrigerator 5 Refrigerator terminal 6b Transmission / reception controller 7 Communication voltage converter 8 Noise blocker 11 Data request signal 12 Refrigerator information data signal 13a Termination code of data request signal 13b Refrigerator information data signal Termination code 15 CPU 16 Serial port 17 ROM

Claims (2)

[Claims] 1. A communication voltage conversion unit of the totalizer and the refrigerator terminal installed between a totalizer using a personal computer installed at the front of a hotel or inn and a refrigerator terminal built into a refrigerator. A refrigerator communication control device comprising: a noise blocking unit including an optical element; and a transmission / reception control unit that switches between a data request signal sent from a totalizer and a refrigerator information data signal returned from a refrigerator terminal. 2. The refrigerator communication control device according to claim 1, wherein the transmission / reception control performs the transmission / reception control by detecting a data request signal and a termination code of the refrigerator information data signal.