JPH04208745A - Communication equipment - Google Patents

Abstract

PURPOSE:To measure the level or the like of a signal with an inexpensive and simple measuring instrument by discriminating reception of a test command signal from a center equipment by a discriminating means and a transmission/ reception means to send a test signal. CONSTITUTION:At the time of incoming of a telephone line, an incoming detecting circuit 1 detects it to turn on a contact 2a of a relay R2. When detecting this state, a CPU 4 turns on a relay D5 to turn on its contact 5a, and the telephone line is connected to a main device. Data transmission between the center equipment and the main device is performed after line connection; and when data from the center equipment is the test command signal, the CPU 4 discriminates it to send the test signal. When a test end signal is received from the center equipment side, the CPU 4 stops to send the test signal and turns off the relay D5 to disconnect the line.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a communication device that transmits data via a telephone line.

(Prior Art) A conventional device of this type is shown in FIG. In the figure, (1) is an incoming call detection circuit consisting of an incoming relay R (2) having a contact (2a) and a capacitor (3);
(4) is a CPU, (5) is a line connection relay D having contacts (5a), and (6) is a transmitting/receiving circuit that transmits and receives, for example, a PB signal (push-button signal).

Next, the operation related to the above configuration will be explained with reference to the flowchart of FIG. 5. When there is a call guard on the telephone line (that is, when there is an incoming call), the incoming call detection circuit (1) detects this and the contact (2a) of the relay R (2) turns on. CPU
When (4) detects this (S5L), relay D
(5) is turned on (552), and the telephone line is connected to the device by turning on the contact (5a).

Thereafter, [, pH (4) exchanges data via the transmitting/receiving circuit (6) in order to transmit data with the center side communication device (S53). When the transmission is completed, relay D(5) is turned off, the line is disconnected, and the process is terminated (S54).

Incidentally, the data signal sent to the line is as follows, for example. That is, 16 types of PB scratch signals are turned on for 0.1 seconds,
Various combinations are made with 0.1 second off and 0.2 second intervals, for example, 6 data and 1.2 seconds of transmission data.

[Problem to be solved by the invention]

Conventional communication equipment is configured as described above, so in order to measure line loss and the level of signals on the line during transmission, expensive and complicated instruments such as oscilloscopes are required. did. JP-A-55-118256 and JP-A-62-168447 disclose techniques for measuring the signal level on a line, but do not disclose solutions to the above-mentioned problems.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a communication device that can measure signal levels, etc., with an inexpensive and simple meter.

[Means for Solving the Problems] A communication device according to the present invention is a communication device that transmits data via a telephone line, and includes a determination means for determining whether or not a predetermined test command signal is received, and a communication device that transmits data from the center-side communication device. The transmitting/receiving means receives the transmitted signal, and also generates a test signal when the determining means operates and sends it to the line.

Further, in the communication device according to the present invention, in the communication device having the above configuration, the determining means also determines the type of the received signal, and the transmitting/receiving means is provided in plurality according to the signal type and transmits the specified transmitting/receiving means. A test signal is sent to the line via the

(Operation) In the present invention, the determination means and the transmitting/receiving means determine whether a test command signal is received from the center device, and send out a test signal.

It also includes a plurality of transmitter/receiver circuits depending on the type of transmission signal, and sends out a test signal according to the transmission signal.

(Example) The present invention will be explained below based on illustrated embodiments.

First, the configuration shown in FIG. 1 is adopted as the configuration according to the first embodiment. In this configuration, CPU (4)
operates according to the flowchart shown in FIG. 2, and makes it possible to measure the line signal level by determining the reception of a test command signal from the center side device and sending out a test signal.

That is, in FIG. 342, first, when there is an incoming call on the telephone line (that is, when a call comes in), the incoming call detection port (1) detects this, and relay R is activated in the same manner as in the conventional example.
Contact (2a) of (2) is turned on. When CPII (4) detects this, it turns on relay D (5) and closes its contact (
5a), the telephone line is connected to the device (321-522). After connecting to the line, data is transmitted to the center device, but if the data from the center device is a “test command signal” (S23),
CP[I (4) judges this and repeatedly sends out a test signal, for example, a PB flaw signal "*J flaw signal 0.1 seconds on and 0.1 seconds off (S24).

When the test end signal is received from the center device side (52
5), the CPU (4) stops sending out the test signal (526), turns off the relay D (5), disconnects the line, and ends the process (527>.In addition, in step 523, the test command signal is If not, data transmission is performed in the same manner as before (528).

Moreover, the above embodiment can also be implemented according to the following aspect.

1) Relay R(2) and relay D(5) may be photorelays.

2) A fixed timer (for example, 1 minute) may be used instead of receiving the test end signal.

3) Has this device explained how to respond to an incoming call? When the CPU (1) receives or judges a call request input, it dials using relay D (5), so it naturally has a call function as well. be able to.

Next, FIG. 3 shows another embodiment, and the same parts as in FIG. 1 are given the same reference numerals, and the explanation thereof will be omitted. In this embodiment, a plurality of transmitting/receiving circuits (61), (62
), ..., (8N), for example, the above-mentioned transmitting/receiving circuit (61) is for PB signals, and the transmitting/receiving circuit (62) is for phase modulated (hereinafter referred to as PSK) signals, and tests using a plurality of signals can be performed. It has been made possible.

That is, as shown in the operation flowchart of CPU (1) shown in FIG.
Similar to the operation flowchart in the figure, after turning on relay D (5) and connecting the line, data is received from the center device, and CPIJ (1) interprets this to determine whether it is a test command signal or not. to judge.

In the case of a test command, the type of transmitter/receiver circuit to be tested next, for example, a message indicating that there is a PB flaw signal is received. In response to this signal, CP[I (1) transmits a test signal via the PB signal transmitting/receiving circuit (61) (540, 545).

After this test is completed, upon receiving a test command signal for the second transmitter/receiver circuit test, CPIJ (1) similarly transmits a test signal via the PSK signal transmitter/receiver circuit (62) (545, 546). . After repeating this several times and receiving the all test end signal, CPU (1) turns off relay D (5), disconnects the line, and ends the process (
546-548).

Note that in the above embodiment, a test mode in which no signal is sent may be provided.

〔Effect of the invention〕

As described above, according to the present invention, the reception of the test command signal from the center device is judged and the test signal is sent out, so that the line signal level can be measured using an inexpensive meter such as a level meter. Possible lid. (It is difficult to measure a normal data transmission signal of several seconds with a level meter due to its response speed.) In addition, it is equipped with multiple transmitter/receiver circuits depending on the type of transmission signal, and sends out test signals according to the transmission signal. This makes it easy to measure each received signal, as well as to easily understand the noise generation status of the line when there is no signal, and to easily analyze the signal level and frequency depending on the type of signal such as PSK signal. .

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an illumination device according to an embodiment of the present invention, Fig. 2 is an operation flowchart of the CPIJ (O) in Fig. 1, and Figs. 3 and 4 show other embodiments of the invention. The correspondence diagram between Fig. 1 and Fig. 2, and Fig. 5 of the conventional example (:P
It is an operation flowchart of U (4). In the figure, (1) is the incoming call detection circuit, (2) and (2a) are the incoming relay R and contacts, (4) is CPt1, (5)
and (5a) are line connection relays and contacts, (61) to (6
N) is a transmitting/receiving circuit. In each figure, the same reference numerals indicate the same or corresponding parts. Figure 1 Figure 3 $2 Figure @5rM Kan 45! !

Claims (2)

[Claims] (1) In a communication device that transmits data via a telephone line, a determining means for determining whether or not a predetermined test command signal is received;
A communication device comprising: a transmitting/receiving means that receives a transmission signal emitted by the center-side communication device, and also generates a test signal and sends it to a line when the determining means operates. (2) In the communication device according to claim (1), the determining means also determines the type of the received signal, and the transmitting/receiving means is provided in plurality according to the signal type and transmits the signal to the line via the designated transmitting/receiving means. A communication device characterized by transmitting a test signal.