JP2973722B2 - Remote monitoring method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote monitoring system, and more particularly to an improved remote monitoring system in which a higher station monitors alarm detection of a message transmission block of a lower station device of a communication line.

[0002]

2. Description of the Related Art Generally, message information is transmitted using a communication line.
From lower station on the broadcast side to upper station on the message side
When transmitting message information, use CCITT international
The message information signal into appropriate units
Digital data within the block unit.
Signal format of communication protocol including error detection and correction.
Have been established. For example, communication of CCITTG704
To illustrate the convention, encode the message as shown in FIG.
Digital data is time slot 0 of 32 blocks
Are divided into time slots 31. Thailand
The block of system slot 0 has 8 bits from bit 1 to bit 8.
The second bit of bit 2 is a message.
Arbitrarily assigning it as an empty bit in the
General. Note that the other first bit and 3 to 8
The first bit is a block unit of time slots 0 to 31
Is usually assigned as a synchronization code. On the other hand, lower station
Message data, which is remote monitoring information, from the network to the upper station
As shown in FIG. 3 , the hardware configuration of the lower station device 20 other than the message transmission block 22 in the lower station device 20 detected by the message transmission block 22 of the lower station device 20 as shown in FIG.
The alarm of the alarm detection unit 27
2M highway interface block
The signal is input to the block 21 to generate a code having the signal format shown in FIG. One time slot determined by the 2M highway interface block 21 ( for example,
The slot 16 ) is sent as a message signal to the upper station apparatus 10. In the upper station apparatus 10, the 2M highway interface block 12 extracts a message signal from the same time slot (for example, time slot 16) and sends it to the message receiving block 11. Here, the message receiving block 11 analyzes the message signal,
An alarm in the lower station was detected.

[0003]

In this conventional remote monitoring system, when an error occurs in the message transmission block of the lower station, it becomes impossible to transmit a message to the upper station. There is a drawback in that it is not possible to detect an abnormality in the message transmission block of the lower station device and to detect an alarm of the lower station device.

[0004]

SUMMARY OF THE INVENTION A remote monitoring system according to the present invention.
Is the number of random monitoring points located in the lower station equipment.
Alarm information to the upper station as a message
To divide the alarm information into predetermined unit blocks
Signal format as multiple time slot signals in time series
Message transmission block generation to form a block of packets
Means, and an output signal of the message transmission block generating means.
Communication protocol of CCITT to transmit
Form multiple time slots in time series based on etc.
A specific time slot in this time slot is N (N is
Integer) bits, at least N
For transmissions that have one free bit among the bits
First 2M highway I forming signal format
Interface block generating means, and
Receiving the signal of the first 2M interface block
And detect at least the bits of the specific time slot.
2M highway interface for extracting port information
Block detection means and the bit of the specific time slot.
Message reception block solution to analyze
In a remote monitoring system having analysis means,
The message transmission block is generated in the transmission block generation means.
An alarm D detecting means of the lock generating means itself is provided.
The information of the alarm D is transmitted to the first 2M highway interface.
And sends the code of the empty bit to the
The alarm D is a message transmission block generating means itself.
Each of the empty bits
Alarm bit generation that converts the code to "1" or "0"
And the sign of the alarm bit generation unit is
Before the message receiving block of the local station
Message sending block within message receiving block
An alarm extracting unit.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. Figure 1 is a block diagram showing one embodiment of the present invention, FIG 2 is present
FIG. 4 is a signal format diagram used in a remote monitoring system including an operation description of an embodiment . The lower station apparatus 20 in FIG. 1
Conventionally, alarm detection other than message transmission block 22
The alarm information of the output unit 27 is transmitted via the alarm monitoring line 22.
This input has been input to the message transmission block 22.
In the example, the alarm detection of the message transmission block 22 itself is performed.
A unit 25 is provided to provide the alarm information "0" at normal time.
"1" when an error occurs Message transmission block alarm monitoring line
23, 2M highway interface block
The alarm bit generation unit 26 provided in the
Bit 2 of time slot 0 shown in FIG.
A means for setting the level to “0” or “1” is provided.
In the upper station apparatus 10, the digital signal from the lower station apparatus 20 is received by the 2M highway interface block 12, separated into each time slot, and output to the message receiving block 11 and the shift register circuit 13. The output of the shift register circuit 13 is input to the protection circuit 14, which will be described later.
If "1" is detected N times consecutively, the message reception block
Message transmission block of the lower station device 20 provided in the network 11
Error alarm detection unit 16 is set to "1".
An outlet 15 is provided.

Next, the operation of this embodiment will be described. In FIG. 1, when a message transmission block 22 of the lower station device 20 detects an alarm in the device, the 2M interface block 21 sends an alarm report message to a determined time slot, for example, time slot 1
In step 6, the data is transmitted to the upper station device 10. In the upper station device 10,
The time slot 16 is extracted by the 2M highway interface block 12 and the message reception block 1 is extracted.
Send to 1. In the message receiving block 11, an alarm in a device other than the message transmitting block 22 can be known from the transmitted message. When an abnormality occurs in the message transmission block 22, the message transmission block alarm monitoring line 23 becomes "0". This is detected by the 2M interface block 21 and a bit of a time slot different from the message is used, for example, the second bit of time slot 0 is set to “0” and transmitted. Conversely, if the message transmission block 22 is normal,
The second bit is always "0". Upper station device 10
Then, the time slot 0 is always sent to the shift register circuit 13 by the 2M highway interface block 12. The shift register circuit 13 outputs the second bit of the time slot, and the output when the message transmission block 22 is abnormal is "1". This output is input to the protection circuit 14, and outputs “1” to the message receiving block 11 when detecting “1” continuously N times.
This is a circuit for preventing chattering. From the output of the protection circuit 14, the message reception block 11 of the upper station device 10 can detect an alarm of the message transmission block 22 of the lower station device 20.

[0007]

As described above, according to the present invention, when the upper station apparatus remotely monitors the message transmission block of the lower station apparatus, bits of a certain time slot are allocated and transmitted for alarm detection. By monitoring the bit in the upper station apparatus, there is an effect that the abnormality of the message transmission block itself of the lower station apparatus which could not be known until now can be accurately known in the upper station apparatus. Here, a 2M terrestrial line has been described as an example, but other terrestrial lines, for example, 1.5M, have the same effect.

[Brief description of the drawings]

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

FIG. 2 is a signal format of the present embodiment.

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

[Explanation of symbols]

Reference Signs List 10 upper station device 11 message receiving block 12, 21 2M highway interface block 13 shift register circuit 14 protection circuit 20 lower station device 22 message transmission block 23 message transmission block alarm monitor line 24 alarm monitor line

Claims (1)

(57) [Claims] 1. An arbitrary monitoring point located in a lower station device.
Information on multiple alarms to the upper station
The alarm information is sent to the
Divided into multiple time slot signals in time series.
Message transmission blocks that form
Lock generation means, and the message transmission block generation means
CCITT to transmit the output signal of the
Multiple time slots based on the communication protocol
And a specific time slot in this time slot
Is formed by N (N is an integer) bits
Both have one empty bit among the N bits
First 2M high to form a signal format for transmission
Way interface block generating means;
Station device of the first 2M interface block
The signal is received and detected, and at least the specific time slot is detected.
2M highway in to extract bit information of
Interface block detecting means and the specific time slot.
Message reception block that analyzes the alarm of the
A remote monitoring system comprising a lock analyzing means;
The message is stored in the message transmission block generation means.
Equipped with alarm D detection means of the transmission block generation means itself.
The information of the alarm D is stored in the first 2M highway.
Send to the interface block generating means the empty bits
Alarm D generates a message transmission block
Depending on the information on whether the means itself is abnormal or normal,
Alarm that converts the sign of a bit to "1" or "0"
A bit generation unit, and a sign of the alarm bit generation unit.
Is detected by the message receiving block of the upper station apparatus.
Send a message in the message receiving block
And a block alarm extraction unit.
Remote monitoring system .