JPH0362768A - Control method for selection signal transmission circuit - Google Patents

Abstract

PURPOSE:To restore a flip-flop circuit to a normal state even when the flip-flop circuit malfunctions by using a microprocessor circuit so as to allow the flip-flop circuit to set as to whether either a dial pulse selection (DP) signal or a pushbutton dial selection (PB) signal is to be sent after the operation of a changeover relay. CONSTITUTION:A microprocessor circuit 13 sends a telephone number of a CAPTAIN center one by one digit each to a selection signal transmission circuit 9. The selection signal transmission circuit 9 references an output of a DP/PB selection flip-flop circuit 10 to decide the selection signal mode and sends the telephone number sent from the microprocessor circuit 13 to the telephone line terminal 1 in the PB mode or the DP mode sequentially. Then a MODEM circuit 8 detects a reply signal from the CAPTAIN center and informs the detection to the microprocessor circuit 13. Finally, the microprocessor circuit 13 and the CAPTAIN center make data communication.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for controlling a selection signal sending circuit of a data communication terminal device, such as a captain terminal device, connected to a telephone line.

Conventional technology In recent years, telephone lines such as the captain system have been used to
The development of technology that allows a terminal device to call up a computer system in a remote location, send and receive image information and text information, and utilize the information for daily life and business information is progressing at a rapid pace.

FIG. 3 is a system configuration diagram of the captain system.

The outline of FIG. 3 will be explained below. A1 is the captain's terminal device, which includes a keyboard for data entry,
pTIi image data display 'l'Jii'i, modem for modulating and demodulating digital data to analog data and transmitting and receiving it, electrically connecting terminal equipment to telephone line network,
The network control circuit 170, which sends out telephone numbers, etc., and the control circuit that controls the entire system should be avoided. A2 is a telephone line network. A3 is the captain center, which sends requested image information and text information to each terminal device, and also manages the image information and text information during data communication. Avoid using image information creation devices for creating input 9.

Next, the operation shown in FIG. 3 will be explained.

If you want to obtain the necessary information from the captain's terminal device A1, you can use the telephone line A2 and the terminal device A1. Fi selection signal (hereinafter referred to as
PB double signal (abbreviated)) is sent to the telephone line network entry 2, and the telephone switching machine in the telephone line network A2 recognizes the DB and PB signals, calls the captain center A3, and sends it to the terminal device A.
1. Create a communication path between Captain Center A3 and enable data communication.

Here, 1) 'lJ, '18 DP signal B and PB double signal are explained. DP double signal, Telecommunications Business Law, Regulations on Rice-Saving Equipment, etc., Chapter 4, Article 11, ``Conditions for Selected Signals'' - In order to comply with the first issue of ``Guillardparnu Condition'',
This is a DC intermittent signal obtained by disconnecting the DC circuit for the telephone network.

PB Shin-hi is also 1 “IJ shield rule No. 1i, which is not set at the end.”
: 1 to ○, * by combining two specific frequencies in accordance with No. 2 "Conditions for push-button dial signals" in Article 11 "Conditions for selection signals".

This is used to obtain selection signals for valves, etc.

The details of these two signals are described in detail in ``Rules 2'', so their explanation will be omitted.

Hereinafter, the surroundings of the conventional network control circuit as described above will be explained with reference to the drawings.

FIG. 4 is a block diagram of the periphery of a conventional network control circuit.

In Figure 4, 1 is a telephone line terminal for connecting to the telephone line network, 2 is a telephone terminal for connecting to a telephone, etc., and 3 is a terminal for switching between modem 1 - Lannes side and telephone terminal 2, etc. A switching relay, a DP relay for sending out a 41dHDP signal, and 5 a DP relay switching noise absorption circuit that absorbs noise during main notching of the DP relay.

6 is a modem lance for preventing DC voltage from being applied to the telephone line network during line connection; 7 is a hybrid circuit for sending/receiving data and PB double signal base; 8 is a modem circuit for modulating and demodulating digital data to analog data. It is. Further, 9 is a selection signal sending circuit for sending out DP and PB times signals, and 10 is a selection signal sending circuit for sending out DP times signal, DP times signal 10PP.
This is a DP/PB selection flip-flop circuit that sets which mode to use: S (10 parnus per second, hereinafter abbreviated as DP10) or DP multiplied signal 20PPS (2o parnus per second, hereinafter abbreviated as DP20). 11 is a switching relay drive circuit that drives the switching relay 3; 12 is a DP relay 4;
A DP relay drive circuit 13 transmits and receives digital data to and from the modem circuit 8, sequentially transmits telephone numbers to the selection signal output path 9, and transmits PB, DPlo, and DP20 to the DP-PB selection flip-flop circuit 10. A microprocessor 101bJ that controls the switching relay drive circuit 11 which sets the mode. i is 1°. Also, FIG. 6 shows the DP/P
B selection selection 7a is 217011.

In FIG. 6, the DP-PB selection flip-flop circuit 10 and selection signal sending circuit 9 are the same as those described in FIG. 3 above.

Regarding the network:li control circuit, where f:, l, 7 are formed as shown in ``2'', below, the operation during data communication will be explained in Section 5.
This will be explained using the flowchart shown in the figure.

First, depending on whether the telephone line supports PB, DPlo, or DP20 mode, for example, turn on the power.
At such time, the corresponding mode is set in advance from the microprocessor circuit 13 to the DP-PB selection flip-flop circuit 10 via the pig 1 line q, the data 2 line q' and the write signal line q'' in FIG.

Additionally, the switching relay 3 is normally 2C, -2B.

2C and 2B are connected and the button is pressed. This connects the telephone connected to the power supply terminal 2 and the telephone line network via the switching relay 3゜ telephone line terminal 1, allowing the telephone to be connected to other terminals for telephone calls. Can be used.

At the start of data communication, the microprocessor 13 connects the switching relay 3 to 2C-2 via the switching relay drive circuit 11.
B, 2C'-2E' to 2O-2A.

20'-2A' (Fig. 6, 81).

Next, the microprocessor circuit 13 also sends Captain Senku's telephone number -'E-' one digit at a time to the selective copy/send 111 circuit 9. The selection signal output path 9 selects the telephone number coming from the microprocessor circuit 13 according to the mode set in the DP/PB selection flip-flop circuit 10, for example, the sixth rental line f.

When V is all low level, it is in PB mode, etc.), and outputs as one of PB, DPl 0 and DP20 (FIG. 5, 32).

In the DP1o4 or DP20 mode, the selection signal sending circuit 9 passes the DPII through the DP relay drive circuit 12.
Nuitching Leh 4. At this time, the DP relay switching noise absorption circuit 4 absorbs the pulse noise caused by the DP relay 0N10FF.

In the PB mode, a PB double signal is sent from the selection signal output path 9 to the hybrid circuit 7, and the modem transformer 6,
It is sent to the telephone line terminal 1 via the switching relay 3.

Next, a response signal from the captain center (e.g. 21
00an signal), connect the telephone line terminal 1. The signal from the telephone line network is monitored by the modem circuit 8 via the cutting relay 3 (connected to 2C-2A, 2C'-2A'), the modem transformer 6, and the hybrid circuit 7 (Fig. 5, 33).
).

When a response signal is received from Captain Senku, the modem circuit 8 sends a response confirmation signal to the microprocessor circuit 13. Accordingly, the microprocessor circuit 13 sends an image information request signal etc. to the modem circuit 8, and the modem circuit 8 converts the digital signal into a frequency band of, for example, 300I.
It is modulated into an analog signal of -1z to 340011□ and sent to telephone line terminal 1. Image information from the Captain Center! j- etc. are telephone line terminals 1. The signal is applied to the modem circuit 8 via the switching relay 3 (connected to 2C2A, 2C'-2A'), the modem transformer 6 and the hybrid circuit 7, and the modem circuit 8 demodulates the signal from an analog signal to a digital signal. , microprocessor circuit 13
(Fig. 5, 34).

In the past, if there was no response signal from the captain center, the operation of S1 in FIG. 5 is repeated again after a certain period of time has elapsed.

Note that the flip-flop circuit used in the DP-PB selection flip-flop circuit 10 includes, for example, IC, 5N74L374N manufactured by Texan Instruments.

Although it is a strange problem to solve with the above method, when the switching relay is activated, the DC voltage of about 48V applied to the telephone line terminal from the telephone line 1]44 is turned off to 0N10FF. The pulse noise generated by this may cause the DP/PB selection flip-flop circuit to malfunction. However, there was a problem in that communication with the captain center was sometimes impossible.

In view of the above-mentioned problems, the present invention has been devised so that the pulse noise of the switching relay can reset the DP-PB selection selection 7 pin path to the normal mode and send out the selection signal in the normal mode. A method of controlling a signal sending circuit is provided.

Means for Solving the Problems In order to achieve this object, the method of controlling the selective signal output circuit of the present invention uses a switching relay that alternately switches the telephone terminal and the modem 1-lance side and connects them to the telephone line terminal. , a selection signal sending circuit for transmitting either a dial pulse selection signal (DP double signal) or a push button dial selection signal (PB double signal) to the telephone line terminal;
D that can set which mode the selection signal sent from the selection signal output path is in, DP double signal, PB double signal.
This is achieved by a microprocessor circuit having means for setting which mode the DP double signal and PB double signal are in on the P-PB selection 7 pin.

By this method, even if the DP-PB selection flip-flop circuit malfunctions once due to parnuis noise generated during the operation of the switching relay, the microprocessor circuit can switch the DP-PB selection flip-flop circuit to the DP-PB selection flip-flop circuit. By resetting the PB mode, the DP-PB selection free selection 7 Note 117011 circuit can send out the DP or PB double signal according to the normal mode.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 2 is a block diagram of a network control circuit according to an embodiment of the present invention. In Figure 2, 1 is a telephone line terminal, 2
is a telephone terminal, 3 is a switching relay, 4idDP relay, 5
is a DP relay switching noise absorption circuit, 6 is a modem transne, 7 is a hybrid circuit, 8 is a modem circuit, 9
is the selection signal sending circuit, 1oidDP-PBB selection 7! J
7'70 is a software circuit, 11 is a switching relay drive circuit, 12 is a DPIJ read drive circuit, and 13 is a microprocessor circuit, which are the same as the configuration shown in FIG.

The operation of the network control circuit that has been intercepted as described above will be explained below. FIG. 1 is a flowchart 1- during data communication in an embodiment of the present invention. Note that blocks S1 and S2 in FIG.

Since S3 and S4 are the same operations as in FIG. 5, explanation &-i. Do it simply. Unfortunately, the DP-PB selection flip-flop circuit 10 has a microprocessor circuit 13 installed in advance.
It is assumed that the mode has been set by , 1. The microprocessor circuit 13 switches the switching relay 3,
Switch to 2C-2A, 2C'-2A' (Fig. 1 8)
1).

Next, PB, DPlo are sent from the microprocessor circuit 13 to the DP/PB selection flip-flop circuit 10.

13. Reset which mode the DP20 is in (first
Figure 5A1).

Subsequently, the microprocessor circuit 13 sends the captain center's telephone number one digit at a time to the selection signal sending circuit 9. The selection signal sending circuit 9 determines the selection signal mode by referring to the output of the DP-PB selection flip-flop circuit 10, and sequentially sends the telephone numbers sent from the microprocessor circuit 13 to the telephone line terminal 1 in PB mode or DP mode. (Fig. 1, 32).

Thereafter, the modem circuit 8 detects a response signal from the captain center, and if detected, notifies the microprocessor circuit 13 (FIG. 1, 83).

Finally, the microprocessor circuit 13 and the captain center will perform data communication (Fig. 1 34)
.

If there is no response from the captain center for a certain period of time, the process returns to 81 in FIG. 1 and the same operations are repeated from 81 onwards.

As described above, according to this embodiment, by setting the selection signal mode in the DP-PB selection fringe circuit again after the operation of the switching relay 14, the DP - Even if the circuit malfunctions once in the PB selection selection flip-flow, it will return to the normal state and the selection signal can be sent in the normal mode.

Effects of the Invention As described above, the present invention provides a switching relay that alternately switches the telephone terminal and the modem transformer side and connects it to the telephone terminal η1,1, and a dial pulse selection signal (DP double signal). and a selection signal sending circuit having a function of sending either a push button dial selection signal (PB double signal) to the telephone line terminal, and a selection signal sent by the selection signal sending circuit,
A single DP/PB selection flip-flop circuit that can set which mode the DP double signal PB double signal is in; a microcontroller having means for setting in the flip-flop circuit which mode the DP double signal PB confirmation mode is in; When the network control circuit consisting of the processor circuit is pressed, the microprocessor circuit sends the DP double signal to the flip 15' and 7 float circuits after the switching relay operates.
By setting which signal of the PB double signal is to be sent, even if the flip-flop circuit malfunctions due to vulne noise generated during switching relay operation, the flip-flop circuit can be returned to its normal state. , its practical effects are great.

[Brief explanation of drawings]

FIG. 1 is a flowchart 1-diagram and a flowchart 2 during data communication in an embodiment of the control method for a j-selection signal sending circuit according to the present invention.
The figure is a block diagram of the network control circuit in the same embodiment, FIG. 3 is a block diagram of the synutem configuration of the conventional captain synutem, FIG. 4 is a block diagram of the network control circuit of the conventional captain terminal device, and FIG. FIG. 6 is a flowchart of a conventional captain terminal device during data communication. FIG. 6 is a block diagram around a DP-PB selection flip-flop circuit in a network control circuit of a conventional captain terminal device. 1...Telephone line terminal, 2...Telephone terminal, 3...Switching relay, 6...Modem transne, 9...Selection signal output path , 10...
...DP-PB detection flip-flop circuit, 13...
...Microprocessor circuit.

Claims (1)

[Claims] A switching relay that alternately switches between the telephone terminal and the modem transformer side to connect to the telephone line terminal, and either a dial pulse selection signal (hereinafter referred to as DP signal) or a push button dial selection signal (hereinafter referred to as PB signal) as described above. a selection signal sending circuit having a function of sending out to a telephone line terminal; and a DP/P for setting which mode of the selection signal sent by the selection signal sending circuit is the DP signal or the PB signal.
A network control circuit comprising a microprocessor circuit comprising a B selection flip-flop circuit and means for setting the flip-flop circuit to either the DP signal mode or the PB signal mode. 1. A method for controlling a selection signal sending circuit, characterized in that the step of setting which signal, the DP signal or the PB signal, is to be sent to the selector relay circuit after the switching relay is operated.