JPS633493B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an information transmission system, and its purpose is to provide an information transmission system that can rationalize wiring and simplify circuit configuration to reduce costs. It's about doing.

Conventionally, signals were transmitted through separate signal lines for the parent-child clock system and the remote monitoring and control system. FIG. 1 is a block diagram of a parent-child clock system, where A is a master clock, a ₁ to a _n are slave clocks with built-in step motors (not shown), and l _A is a signal line.
In such a parent-child clock system, there is _a second
A signal pulse as shown in the figure is emitted from master clock A. That is, for every t ₁ (e.g. 30 seconds), the width of t ₀ (e.g. 1 second)
Positive pulses P _t+ and negative pulses P _t- are alternately sent out to simultaneously drive the step motors of child clocks a ₁ to _an to manage time. In this case, the signal line
l _A is a weak electric wire that is specially wired. Also, pulse
The voltages of P _t+ and P _t- are, for example, +24V and −24V, respectively.
That's about it. Next, FIG. 3 is a block diagram of a remote monitoring and control system using time division multiplex transmission, in which B is a main control and monitoring panel, b ₁ to b _o are terminals, and l _B is a signal line. A signal as shown in FIG. 4 is sent to the signal line _lB. This shows the transmission _/ reception pulse of the signal to the terminal b _i , where S _i is the start signal (synchronization pulse), and P ₁ to P _K are the address signals (terminal b _R is a pulse to send a monitoring signal _{from terminal b i to} main control monitoring panel B, and this pulse During the time period R, a transistor is used to sink the signal lines l and _B in the terminal device b _i according to the monitoring contents, and the main control monitoring panel B detects the current change.
S _i+1 is the start signal for the next terminal b _i+1 ,
Such pulse groups are sent out cyclically. In this case, the signal transmission/reception time t _i to the terminal device b _i is, for example, about 10 msec. The signal line _lB is a specially wired weak electric wire like the signal line _lA .

Conventionally, such systems are wired independently and are completely separated from each other in terms of system. On the other hand, in modern buildings, offices, schools, etc., weak electrical wiring is increasing due to the adoption of parent-child clock systems and the introduction of remote monitoring and control systems, and due to the nature of the system, complete piping is required to prevent damage caused by rats. In terms of construction, the work is quite time-consuming.

The present invention has been made in view of this point, and will be explained in detail below with reference to Examples.

In Fig. 5, 1 is a parent-child clock system as shown in Fig. 1, 2 is a remote monitoring and control system as shown in Fig. 3, and the signals of both systems are connected to the same signal line.
time division multiplex transmission. FIG. 6 is a signal waveform diagram sent out on the signal line l, where t _p is the time for operating the time management system, t _s is the time for transmitting and receiving signals of the information transmission system,
The respective signal voltages are approximately the same (for example, ±
24V). In this case, the step motors of the child clocks a ₁ to _{a n} of the time management system 1 generally generate a signal pulse train (see Fig. 4) that switches between positive and negative at high speed.
S _i , P ₁ to _{P R} , R, S _i+1 ). For example, the response of a step motor is 0.8.
Since it takes about 1 second, it cannot follow rapidly changing pulses and does not operate in the _ts period shown in FIG. 6.

FIG. 7 shows a signal switching means according to an embodiment of the present invention, in which the signal as shown in FIG _. The clock is driven for a period of _p , the contact is switched to the master clock A side, and the signal (a signal with a width of _tp ) is sent directly to the signal line l. Therefore, at this time _tp , the remote monitoring and control system 2 is disconnected. FIG. 8 shows another embodiment of the present invention, in which the line drive circuit of the main control and monitoring panel B of the information transmission system 2 is shared with the signal drive of the master clock A of the time management system 1. A signal as shown in Fig. 4 for a remote monitoring and control system is generated from a signal source M' through a diode D ₄ and a resistor.
Transistor T _r4 is driven through _R5 , and output transistors T _r7 and T _r9 are driven depending on whether it is turned on or off, and a signal train as shown in FIG. 4 is sent to signal line l. On the other hand, positive pulse P _t+ from master clock A
When output, this pulse drives the transistor T _r4 through the resistor R ₁ and the diode D ₁ , so the output transistor T _r7 is driven during the sending period of the pulse P _t+ , and a positive long pulse is sent to the signal line l. .
Conversely, when a negative pulse P _t- appears, the diode D ₂ ,
Transistors T _r1 , T _r2 , and T _r3 are driven through resistor R ₂ , and therefore transistor T _r4 is turned off. Therefore, the output transistor T _r9 is driven and a negative long pulse is sent to the signal line l.
During the period (t _s ) when there is no pulse from the master clock A, the output transistor receives the signal from the signal generator M'.
As described above, T _r7 and T _r9 are driven. Incidentally, the resistor _R10 is a detection resistor for detecting the monitoring signal sinked on the terminal device side as a current during the period of the pulse R in FIG. 4. Furthermore, the signal line D running from the master clock A to the signal generation source M' can perform scheduled operation of the information transmission system 2 by transmitting correct and highly accurate time timing, thereby increasing the functionality of the system. This is what I did.

As described above, the present invention provides a parent-child clock system that sends a drive signal consisting of long pulses at fixed time intervals from a parent clock, and uses the drive signal to drive a step motor of a child clock to display time. a remote monitoring and control system that transmits a monitoring signal consisting of a pulse train signal between a control monitoring panel and a terminal;
It consists of a signal switching means that time-division multiplex transmits the signals of both systems via a pair of signal lines, and by setting the pulse width of the monitoring control signal sufficiently short compared to the pulse width of the drive signal, the steps of the slave clock can be controlled. The motor does not respond to supervisory control signals consisting of short-width pulses, and the signals from the parent-child clock system and the remote supervisory control system are time-division multiplexed via the same signal line. The signal lines that were provided for each system in the conventional example can be made into a pair of common signal lines,
This has the effect that wiring can be rationalized. In addition, by setting the pulse width of the supervisory control signal sufficiently short compared to the pulse width of the drive signal, the step motor of the child clock does not respond to the supervisory control signal consisting of short pulses. This eliminates the need for a signal discrimination means for removing control signals and extracting only drive signals, thereby simplifying the configuration and reducing costs. In other words, in the slave clock of a parent-child clock system, the present invention simplifies the circuit configuration by cleverly utilizing the response characteristics of the step motor to separate and extract only the drive signal from the time-division multiplexed signals. In particular, the circuit configuration of the slave clock can be simplified and the cost can be reduced.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of a conventional parent-child clock system, Figure 2 is a transmission signal waveform diagram of the same as above, Figure 3 is a configuration diagram of a conventional remote monitoring and control system, Figure 4 is a transmission signal waveform diagram of the same as above, Figure 5 is a configuration diagram of one embodiment of the present invention, Figure 6 is a transmission signal waveform diagram of the same as the above, Figure 7 is a specific circuit diagram of the main part of the same, and Figure 8 is a diagram of the main part of another embodiment of the same. It is a specific circuit diagram. 1...Parent-child clock system, 2...Remote monitoring and control system, l...Signal line.

Claims (1)

[Claims] 1. A parent/child clock system that sends out a drive signal consisting of long pulses at fixed time intervals from a master clock, and uses the drive signal to drive a step motor of a slave clock to display time, a main control monitoring panel, and a terminal device. The system consists of a remote monitoring and control system that transmits a supervisory control signal consisting of a pulse train signal between An information transmission system characterized in that the step motor of the slave clock does not respond to a supervisory control signal consisting of short pulses by setting the pulse width sufficiently short compared to the pulse width of the drive signal.