JPH0529182B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an automatic power supply device that remotely controls the power supply of a terminal connected to a communication line, and in particular, the present invention relates to an automatic power supply device that remotely controls the power supply of a terminal connected to a communication line. The present invention relates to a power control device for a line connection terminal that prevents the problem.

(Prior Art) In recent years, data distribution and collection systems using communication lines have been widely used.

For example, some POS (Point of Sells) systems collect the day's sales, purchase information, etc. at each store to a host computer in the sales headquarters.

This is to collect the total results for the day, so the data can only be sent after the store is closed.
In addition, since the host computer sequentially receives data from a large number of stores, the store staff cannot leave unless they wait until it is their turn.

Therefore, in order to be able to collect and receive these data unattended at any time upon request from the host computer, it was necessary to leave the POS terminal's power on all day long.

Another example is urine collected from humans at a hospital.
Blood, etc., is not tested at the hospital, but sent to a specialized testing center, where it is analyzed and the results are sent to the terminal at the hospital via a public line. The blood received at the hospital is analyzed and tested during the night, and the analysis results are sent to the hospital by the time the hospital opens the next day to improve services and provide prompt treatment.

As mentioned above, when collecting and distributing data through a line, each terminal connected to the line must be turned on throughout the day so that it can be activated at any time in response to a request from the host computer. It was impossible.

In addition, personal computers (hereinafter referred to as personal computers) with excellent data processing functions are widely used as terminals for these devices, and floppy disks and the like are used as memory because they handle large amounts of data.

However, since personal computers are priced at low prices, they lack reliability when used as equipment that operates for long periods of time. The same was true for floppy disks and the like.

Therefore, in order to solve this problem, an automatic power supply device is built into these terminals, and the computer is turned on and activated only when there is a request for data collection or distribution from the host.
When the power is turned on, a predetermined program is started in advance so that data can be exchanged with the host, increasing the reliability of the personal computer and saving energy.

(Problem to be Solved by the Invention) However, the conventional automatic power supply device of this type does not send an incoming call signal (CI) to the telephone connected to the personal computer.
signal) is input, the computer is automatically powered on regardless of where the other station is, the computer program is started, and data is received with the host computer (hereinafter referred to as host). He was giving lessons.

Therefore, even if a person makes a wrong call to the telephone, the telephone will start up, which is a problem.

Since the computer program would start even if such a wrong call was made, these abnormalities had to be detected and dealt with in the program.

In other words, when a human voice (analog signal) is input, that signal is converted into meaningless digital data by the modem and input to the computer, but the computer determines that it is not normal data and outputs it as a constant. After an hour, I disconnected the phone, and then the computer turned itself off.

As a result, the system lacked safety and reliability.

The present invention was developed in view of the above-mentioned problems, and even if an incorrect call is received by a human, it is determined before starting the personal computer and only the call is answered when the call is received from the correct caller. The purpose of the present invention is to provide a power control device for a line connection terminal that automatically turns on the power of a personal computer and improves the safety and reliability of the system.

(Means for solving the problem) The above object is a data communication system in which a data processing terminal is connected to a line via a modem, and an automatic power supply device that remotely controls the power supply of the terminal.
an incoming signal detection circuit unit that detects an on state of an incoming signal from the modem; an incoming signal counting comparison circuit unit that adds up the number of times the incoming signal detection circuit unit detects the incoming signal; and an incoming signal counting and comparison circuit unit that starts a clock upon detection of the incoming signal. an incoming signal counting time monitoring circuit unit that resets the integrated number of the counting comparison circuit unit after a set time; a line detection circuit unit that detects the falling edge of the transmission/receivable signal of the terminal; and an integrated number of the counting comparison circuit unit. A power source for a line connection terminal, comprising a terminal power supply drive section that turns on the power of the terminal when a predetermined plurality of circuits are reached and turns off the power of the terminal according to an output signal of the line detection circuit section. This is accomplished by a control device.

(Operation) According to the configuration of the present invention, when a host issues a data collection/distribution request to a terminal connected via a line and a modem, the power supply control device according to the present invention The CI signal of the modem connected to the terminal is detected, and when the CI signal is detected a set number of times within a predetermined period of time, the power of the terminal is turned on and the receiving/receiving signal set in advance in the terminal is activated. The distribution program is automatically started to perform data transmission/reception processing with the host. When the data distribution/concentration processing is completed, the terminal turns off the transmission/reception enable signal (ER signal), and the power supply control device turns off the power of the terminal upon detection of this signal.

In other words, even if a person makes a mistaken call, if the power control device is set to detect a CI signal five times in one minute as a normal request from the host, the power control device will continue to make one call in a row. It is not assumed that the user will make the wrong call five times in a minute, and malfunctions of the terminal due to the wrong call can be prevented.

In this way, even if the power to the terminal is turned off, the power to the terminal can be automatically turned on at the request of the host to start up the terminal and perform predetermined transmission/reception processing. Therefore, it is possible to not only save power and improve the reliability of the terminal, but also improve the reliability and safety of the entire data communication system.

(Example) Next, an example of the present invention will be described in detail based on the drawings.

FIG. 1 is a block diagram of a power supply control device showing an embodiment of the present invention, FIG. 2 is a system configuration diagram using the device according to the present invention, FIG. 3 is a sequence diagram of the power supply control device, and FIG. 4 shows the time chart.

First, in Figure 1, 1 is a modem (demodulator),
2 is a terminal device (in this case, a personal computer); 3 is a communication circuit that serves as a medium for serial data transmission between the modem 1 and the terminal 2;
It consists of a transmission data signal (hereinafter referred to as a CI signal) 4, a received data signal (hereinafter referred to as an SD or RD signal) 5, 6, a terminal side transmission/reception enable signal (hereinafter referred to as an ER signal) 7, and the like. 8 is an incoming signal detection circuit which detects the rising edge signal of the CI signal 4;
is branched from the communication circuit 3, and its rising signal is detected by an inverter element or the like.

Reference numeral 9 denotes an incoming signal counting time monitoring circuit that starts a clock based on the output signal 12 of the incoming signal detection circuit 8 (0 to 5 V in the present invention, hereinafter the circuit is configured with this signal voltage value). After the elapse of time, a counter reset signal 10 is output to the incoming signal count comparison circuit 11. The incoming signal count comparison circuit 1
Reference numeral 1 denotes a counter circuit composed of a flip-flop, which receives the output signal 1 of the incoming signal detection circuit 8.
It integrates by inputting the rising edge signal of 2'.
When the counter circuit reaches a count number (preset value) set in advance by a switch or a jumper wire, the output signal 22 is turned on to the ON command setting circuit 1.
Output to 3.

This ON command setting circuit 13 is composed of a circuit that drives a relay by the output signal 22 of the incoming signal counting and comparison circuit 11, and turns on/off the power (usually 100V) of the terminal 2 using the contacts of the relay. The power supply control circuit 14 turns on or off the power of the terminal under this control.

Then, when the terminal 2 is powered on, it automatically runs the initial program programmed in the terminal in advance, turns on the ER signal 7, notifies the modem 1 that the terminal is ready for transmission and reception, and By inputting a DR signal (modem side transmission/reception enable signal) which is an answer back signal for the signal 7 from 1, the desired host data reception processing is performed.

Further, the incoming signal counting time monitoring circuit 9 outputs a counter reset signal 10 when a set number of CI signals 12 are not input within a predetermined time,
The counter of the incoming signal count comparison circuit 11 is reset.

As a result, the incoming signal count comparison circuit 11
Furthermore, since the CI signal 4 is integrated from the beginning, malfunctions caused by a person's wrong call or the like can be prevented.

Conversely, when the CI signal 12' is input a set number of times within the count-up, the relay is driven as described above and the terminal 2 is powered on.

In this case, the timer of the incoming signal counting time monitoring circuit 9 may be reset by the output signal 14 of the incoming signal counting comparison circuit 11, or
It may be reset by the rise of the ER signal 7 of the terminal 2.

Further, the counter of the incoming signal count and comparison circuit 11 is reset by the rise of the ER signal 7.

This initializes the circuit and allows it to respond to the next request from the host.

Reference numeral 15 denotes a line detection circuit which detects the fall of the ER signal 7 of the terminal 2, thereby turning off the drive of the relay described above and turning off the power of the terminal 2.

In this case, instead of turning off the power immediately when the ER signal 7 turns OFF, the
s) By outputting the OFF command 16 after
The internal program of the terminal 2 is initialized so that it can respond to the next request from the host.

Next, Figure 2 shows the overall system configuration, where 18 is a host computer, 19 and 19' are
An NCU (Network Control Unit), 20 is a public communication line, and 17 is a power supply control device according to the present invention, which has the circuit configuration described above.

3 indicates a communication circuit, and 21 indicates a power line that supplies power to the terminal 2.

In addition, although this example was explained using a public communication line,
By inputting and connecting a CD signal (carrier detection signal) to the incoming signal detection circuit 8 instead of the CI signal, it can also be used for a non-switched line. Then, these CI signals and the CI signal are OR-connected, and the output signal thereof is inputted to the incoming signal detection circuit 8.

Next, its operation will be explained.

When a host computer 18, which is a partner station, requests data collection/distribution to the terminal 2, the output signal of the host computer 18 is modulated by the modem 1', and sent to the terminal 2 via the public communication line 20 via the NCU 19. The line of the terminal 2 is selected, the line of the terminal 2 is connected, and the incoming signal of the NCU of the terminal 2 is demodulated by the modem 1.

Then, by detecting the rising edge of the CI signal 4 from the modem 1, the timer of the incoming signal counting time monitoring circuit 9 is started, and at the same time, the incoming signal counting comparison circuit 1
Add 1 to the count of 1.

Then, the host computer 18 performs a telephone connection/disconnection cycle on the terminal 2 within the predetermined time set by the incoming signal counting time monitoring circuit 9, for example, three times (incoming call If the count value of the signal count comparison circuit 11 is set to 3), the signal 14 of the incoming signal count comparison circuit 11 is output, and the relay of the ON command setting circuit 13 is driven to turn on the power of the terminal 2.

After the terminal 2 automatically starts the initial program, it turns on the ER signal 7 and notifies the modem 1' that the terminal 2 is ready for transmission and reception.

When the terminal 2 receives a DR signal (a signal indicating that the modem is ready for transmission and reception) which is an answer back signal for this signal 7 from the modem 1, data exchange with the host computer 18 is executed.

When the data transmission from the host computer 18 is completed, the terminal 2 determines the command (for example, ETX code) that is the end of the data, and ER
Turn off signal 7. This disconnects the line.

Then, after receiving the ER signal 7, the power supply control device 17 receives the ER signal 7, and after a certain period of time (in this embodiment, 100
Output OFF command 16 to ms) and turn off the relay.
Turn off the power to terminal 2.

In the above sequence, the host computer 18
The terminal 2 can be turned on/off remotely in response to a request.

The time chart in FIG. 4 is a chronological display of the sequence diagram in FIG. 3 by displaying ON/OFF signals.

(Effects of the Invention) As described above, the present invention automatically turns on the power of the terminal only when a predetermined number of calls are received in a short time and within a certain period of time. This eliminates the need for terminals to be activated, thereby increasing the safety and reliability of the data communication system.

Additionally, multiple terminals connected to the line can be powered on automatically according to commands from the host computer, allowing the terminals to be used without impairing their hardware reliability.
It can be used for distributing data files at night, starting automatic programs when unattended, distributing messages in emergencies, etc. This makes file transfer unattended and can be used at night when electricity costs and line usage charges are low. Effects such as this can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a power supply control device showing an embodiment of the present invention, FIG. 2 is a system configuration diagram using the device according to the present invention, FIG. 3 is a sequence diagram of the power supply control device, and FIG. 4 is a The time chart is shown below. 1, 1'...Modem, 2...Terminal, 3...Communication circuit, 4...CI signal, 7...ER signal, 8...Incoming signal detection circuit, 9...Incoming signal counting time monitoring circuit, 11 ...Incoming signal count comparison circuit, 13...
ON command setting circuit, 14...Power control circuit, 15
... Line detection circuit, 17 ... Power supply control device, 18
...Host computer, 19...NCU, 20
...Public communication line.

[Claims]

1. In a method for diagnosing a transmission error detection unit in a transmission system that transmits data frames in a format having a frame check sequence,
If the code is the same as the frame check sequence code of the previously transmitted data frame, the code is changed and information indicating this change is added to the data transmission, and the receiving side transmits the said information. When received, it locks the frame check sequence check error processing, then performs a frame check sequence check, and returns the result to the sending side. Based on this reply result, on the sending side, A method for diagnosing a transmission error detection section, comprising diagnosing a function of the transmission error detection section on the receiving side.