JPH02159151A - Initializing method for transmitting device - Google Patents

Abstract

PURPOSE:To automatically initialize a transmitting device with no manual operation by securing such a constitution where one of two transmitting devices detects the discontinuation of signals and initializes its own circuit when the other transmitting device stops the transmission of signals to the other device. CONSTITUTION:A transmitting device Rx has a malfunction due to the external noises (electromagnetic induction noises and electrostatic noises) or an instant stop, etc., and becomes unrestorable to supply no answer signal to a transmitting device Tx. In such a case, the device Tx stops the transmission of signals. Then the device Tx waits for an initialization process of the device Rx for a fixed period right after a non-conductive state is secured between the input and output terminals of a gate circuit 9. When the device Tx stops the transmission of signals, a transmission stop detecting circuit 12 detects the fall of the signal. Then the reset signals are supplied to each reset signal input terminal of a communication control circuit 5, an input/output port 6, and a microcomputer 7 respectively. Thus each register, etc., can be initialized.

Description

[Detailed Description of the Invention] "Field of Industrial Application" This invention relates to an initialization method for a transmission device applied to remote control of measuring instruments, etc., and particularly enables initialization settings in the case of unmanned operation. This invention relates to an initial activation method for a transmission device.

"Prior Art" FIG. 5 is a block diagram showing the electrical configuration of a transmission device using a conventional initialization method. In this figure, l is light/
Electrical (0/E) conversion circuit, 2 is decoding circuit, 3 is electrical/
4 is an optical (E/O') conversion circuit and an encoding circuit. 5
is a communication control circuit, and 6 is an input/output board. A microcomputer 7 includes a CPU (central processing unit), a RAM (random access memory), and an rLOM (read only memory) (not shown). A program for controlling the CPU is written in the ROM. Here, each of the above-mentioned communication control circuit 5, input/output capotro, and microcomputer 7 has a function of initializing registers and the like of its own circuit based on a reset signal supplied from the outside. 8
is an initialization signal generation circuit, which supplies a reset signal to each of the communication control circuit 5, input/output capotro, and microcomputer 7 described above. In this case, the initialization signal generation circuit 8 includes a reset switch that allows the operator to output a reset signal as desired, and a delay circuit that automatically outputs the reset signal when the power is turned on.

In the transmission device configured as described above, in order to initialize the device, the reset switch provided in the initialization signal generation circuit 8 is turned on, or the power is turned on again. In this case, if either one is performed, the initialization signal generation circuit 8, communication control circuit 5, input/output port
The controller and microcomputer 7 are each supplied with a heliset signal. As a result, each of these is initialized.

Note that there is also a method in which the microcomputer 7 decodes the received signal and resets the registers, etc. of each circuit of the device, without using the initialization signal generation circuit 8.

"Problem to be Solved by the Invention" By the way, in the method of initializing a transmission device using a reset switch or a delay circuit, it is difficult for the operator to operate the reset switch or turn on the power from the outside. Therefore, it cannot be applied to unmanned operation of the transmission equipment.

In addition, in the method in which the microcomputer initializes the transmission device based on the received signal, it is assumed that the receiving system of the optical/[air converter circuit 1, decoding circuit 2, communication control circuit 5, and microcomputer 7] is normal. It cannot be applied unless it is in a working condition.

This invention has been made in view of the above-mentioned circumstances, so that it is possible to initialize a transmission device that is operated unmanned without the need of a worker, and also when the receiving system of the device is not necessarily in a state of normal operation. It is an object of the present invention to provide a method for initializing a transmission device that can initialize the device even when the device is initialized.

"Means for Solving the Problem" The method of the present invention is applied to two transmission devices that constantly exchange signals via a transmission path, and one of these transmission devices initializes the other. In the method for initializing a transmission device, when the one transmission device stops transmitting the signal to the other transmission device, the other transmission device detects this stop and initializes its own circuit. It is characterized by

"Operation" According to the method described above, when the other transmission device detects that a signal is no longer being transmitted from one transmission device, the other transmission device initializes its own circuit. This makes it possible to initialize the circuit of the other transmission device without relying on human labor. In addition, since the circuit is initialized by detecting the presence or absence of a signal transmitted from one transmission device, initialization can be performed even if all the circuits that make up the receiving system are not operating normally. is possible.

"Embodiments" Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a case where a method for initializing a transmission device according to an embodiment of the present invention is applied to a transmission system of a conventional transmission device. In this figure, parts common to those in FIG. 5 described above are designated by the same reference numerals, and their explanation will be omitted.

In this figure, 7a is a microcomputer,
In addition to having the same functions as the aforementioned microcomputer 7 (see Figure 5), it also has a function of outputting a transmission stop signal for a predetermined period when no signal is supplied from the outside (another transmission device). . In this case, the transmission stop signal is output to the outside via the input/output capotro. Reference numeral 9 denotes a gate circuit, which is inserted between the electrical/optical conversion circuit 3 and the encoding circuit 4. In this case, the input and output terminals of the gate circuit 9 become non-conductive when the transmission stop signal is supplied.

Next, FIG. 2 is a block diagram showing a case where the same embodiment is applied to a receiving system of a conventional transmission device. In this figure, parts common to those in FIG. 5 described above are designated by the same reference numerals, and their explanation will be omitted.

In this figure, reference numeral 12 denotes a transmission stop detection circuit, which includes a monostable flip-flop and the like. The transmission stop detection circuit 12 detects the fall of a signal supplied from the outside and then generates a reset signal of a predetermined pulse width after a predetermined time. 13c=13c is an OR gate operated by two people, and one input terminal of each gate is commonly connected and connected to the output terminal of the transmission stop detection circuit 12. Further, the other input terminals are commonly connected and connected to the output terminal of the initialization signal generation circuit 8. Also, or gate 13a
The output terminal of the OR gate 13b is connected to the reset signal input terminal of the communication control circuit 5, and the output terminal of the OR gate 13b is connected to the input/output coupler.
Connected to Toro's reset signal input terminal. Further, the output terminal of the OR gate 13c is connected to the reset signal input terminal of the microcomputer 7a.

Next, the operation of each transmission device when the transmission device with the improved transmission system described above is used in a base station and the transmission device with an improved reception system is used in an unmanned station will be explained with reference to the flowchart in Figure 3. do.

Note that the transmission device of the base station is referred to as “transmission device Tx”,
The transmission device of the unmanned station is referred to as "transmission device Rx." Further, the transmission device TX and the transmission device Rx are connected by an optical fiber (path shown).

Now, a signal encoded based on a predetermined code rule is transmitted from the transmission device Tx to the transmission bag rI via the optical fiber.
When supplied to iRx, the transmission device Rx supplies a response signal to the transmission device ETx indicating that it has received the signal. As a result, the transmission device Tl+ performs normal processing (step St). On the other hand, if the transmission device Rx malfunctions due to external noise (?!?! Magnetic induction noise, electrostatic noise) or instantaneous power failure, and becomes unable to recover and does not supply a response signal to the transmission device Tx, the transmission device Tx Sending out the signal is stopped (step S2). That is, the microcomputer 7a of the transmission device Tx supplies a transmission stop signal to the gate circuit 9 via the transmission capotro, thereby making the input and output terminals of the gate circuit 9 non-conductive. Immediately after the input and output terminals of the gate circuit 9 are made non-conductive, the transmission device RX waits for initialization processing for a certain period of time (step S3). Here, Fig. 4 (a)
As shown in FIG. 4, when the transmission device Tx stops transmitting the signal, the transmission stop detection circuit 12 of the transmission device Rx detects the fall of the signal, and immediately after a predetermined time (1 to 2 seconds), the transmission stop detection circuit 12 of the transmission device Rx detects the fall of the signal. Output a reset signal as shown in (b).

A reset signal output from the transmission stop detection circuit 12 is supplied to one input terminal of each of the OR gates 13a to 13c,
A reset signal is supplied from the output terminals of these OR gates 13a-+3d to each reset signal input terminal of the communication control circuit 5, the turnout capotro, and the microcomputer 7. As a result, the registers and the like of the communication control circuit 5, input/output captro, and microcomputer 7 are initialized. Then, after the transmission device Tx waits for the initialization process of the transmission device Rx, the transmission device Tx performs normal processing again (step S4).

In this way, when the transmission device Tx detects an abnormality in the transmission device RX and stops sending signals, the transmission device Rx initializes its own circuit, so it is possible to use the transmission device R1 as an unmanned station. become.

Also, transmission equipment RX optical/fi! As long as the air conversion circuit 1 does not fail, it is possible to initialize the device Rx.

Further, the transmission device Tx is provided with a gate circuit 9 and a microcomputer 7a with expanded ROM functions, and the transmission device Rx is provided with a transmission stop detection circuit 12 and an OR gate 13a.
=13c, the circuit becomes simple.

In the above embodiments, either the transmitting system or the receiving system of the transmission device is improved, but both the transmitting system and the receiving system may be improved.

Further, in the above embodiment, the transmission stop signal is generated within the transmission device, but it may be generated manually from outside the device.

``Effects of the Invention'' As explained above, the method of the present invention is applied to two transmission devices that constantly exchange signals via a transmission path, and one of these transmission devices can transmit signals from the other. In the method for initializing a transmission device, when the one transmission device stops transmitting the signal to the other transmission device, the other transmission device detects this interruption and initializes its own circuit. Therefore, it is possible to automatically initialize the circuit of the other transmission device without manual intervention. Further, since it can be done with a simple circuit configuration (in the embodiment, the gate circuit 9, the transmission stop detection circuit 12, and the OR gates 13a to !3c), it is possible to suppress the increase in cost.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a transmission system of a transmission device to which an embodiment of the present invention is applied, FIG. 2 is a block diagram showing a reception system of the transmission device, and FIG. 3 explains the operation of the transmission device. FIG. 4 is a waveform diagram for explaining the operation of the transmission device, and FIG. 5 is a block diagram showing the conventional transmission device. 5... Communication control circuit, 6... Input/output board, 7.7a... Microco 9... Gate circuit, I2... - Transmission stop detection circuit, 13a=13c...OR gate. Nbuta,

Claims (1)

[Claims] In a method for initializing a transmission device that is applied to two transmission devices that constantly exchange signals via a transmission path, and in which one of these transmission devices initializes the other, one of the transmission devices A method for initializing a transmission device, characterized in that when transmission of the signal to the other transmission device is stopped, the other transmission device detects this interruption and initializes its own circuit.