JP2001126166A - Annunciator controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an annunciator controller of a simple constitution which never performs a wrong display by assuring the transmission of data. SOLUTION: A serial parallel conversion circuit 20 transmits serial data before they are converted into parallel data and the annunciator controller is provided with a serial receiving circuit 12 which receives the serial data from the circuit 20, a data comparison part 13 which compares the serial data transmitted from a serial transmitting circuit 11 with the serial data received by the circuit 12 and an output control part 22 which controls output of the parallel data converted by the circuit 20 to a display part 21 according to the result of comparison that is obtained form the part 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an annunciator control device for collectively displaying operating states of various sensors and terminals in a building automation system such as lighting control and disaster prevention monitoring.

[0002]

2. Description of the Related Art Conventionally, an annunciator control device has been used in a building automation system such as lighting control and disaster prevention monitoring, and the operating states of various sensors and terminals in the system are collectively displayed. I have.
The annunciator control device determines display data based on data transmitted from the central monitoring device or the like, and turns on or blinks an LED of a display unit provided corresponding to each sensor or terminal.

FIG. 7 is a block diagram showing an example of a main configuration of a conventional annunciator control device. Here, the display data sent from the control unit 100 allows an externally designated display to be displayed on the display unit 200, and the serial data sent from the control unit 100 is converted into parallel data by the display unit 200. It will be converted and displayed.

The control unit 100 includes an annunciator control unit 110 for determining display data, and a synchronous serial transmission circuit 111 for transmitting display data sent from the annunciator control unit 110 as serial data synchronized with a clock. Have. On one display 200,
A serial / parallel conversion circuit 210 that converts serial data received from the synchronous serial transmission circuit 111 into parallel data in synchronization with a clock, and an LED or the like, based on the parallel data converted by the serial / parallel conversion circuit 210. Display unit 21 for displaying the display
1 is provided.

[0005]

In the above-described conventional annunciator control device, the display unit 2 does not check whether the serial data transmitted from the control unit 100 has been transmitted normally.
Since the display was performed at 00, erroneous data was transmitted due to the influence of noise or the like, and an erroneous display was sometimes displayed on the display device 200, which reduced reliability.

A method of detecting whether data has been transmitted normally includes a checksum and a parity check. However, adopting such a method requires a complicated circuit configuration and a simple serial communication. Since the realization is difficult with the / parallel conversion circuit, a microcomputer or the like is used, and there is a problem that the manufacturing cost is increased. The present invention has been made in view of such circumstances, and has as its object to provide an annunciator control device that does not display erroneously by guaranteeing data transmission with a simple configuration. .

[0007]

In order to achieve the above object, in the annunciator control device according to the first aspect of the present invention, the serial / parallel conversion circuit transmits serial data before conversion to parallel data. A serial receiving circuit that receives serial data transmitted from the serial / parallel conversion circuit, and a data comparison that compares the serial data transmitted by the serial transmitting circuit with the serial data received by the serial receiving circuit. And serial / data based on the comparison result of the data comparison unit.
An output control unit that controls output of the parallel data converted by the parallel conversion circuit to the display unit.

The output control section outputs the parallel data at that time to the display section if the comparison result of the data comparison section is "match", but outputs the parallel data if the comparison result of the data comparison section is "mismatch". The parallel data at that time should not be output to the display unit. According to a second aspect, in the first aspect, the annunciator control unit is configured to receive a comparison result by the data comparison unit, and when the comparison result does not match, retransmit the display data to the serial transmission circuit. It is characterized by.

According to a third aspect of the present invention, in the first or second aspect, the output control section outputs parallel data and displays the data on the display section when the result of comparison by the data comparison section matches. When the comparison result of the data comparison unit does not match, without outputting the parallel data,
The data is not displayed on the display unit. According to a fourth aspect, in the first or second aspect, the output control unit, when the comparison result of the data comparison unit matches,
While outputting parallel data and displaying the data on the display unit, when the comparison result of the data comparison unit does not match, the same parallel data as before is output and the data is displayed on the display unit. I do.

According to a fifth aspect, in the first or second aspect, the output control section includes a data input terminal for inputting parallel data from the serial / parallel conversion circuit, and a data output terminal for outputting parallel data to the display section. And a three-state buffer circuit having an enable signal input terminal for inputting an enable signal from the data comparison unit.

According to a sixth aspect of the present invention, in the first or second aspect, the output control unit includes a data input terminal for inputting parallel data from the serial / parallel conversion circuit, and a data output terminal for outputting parallel data to the display unit. And a latch circuit having a latch signal input terminal for inputting a latch signal from the data comparison unit.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an example of a main part configuration of the annunciator control device A.
FIG. 1 is a diagram illustrating an example of a configuration of a building automation system including an annunciator control device A. FIG. 3 is a diagram illustrating an example of an external appearance of the annunciator control device A.

FIG. 2 shows an example of a disaster prevention monitoring system in a building automation system. A central monitoring device 3 installed in a central monitoring room is connected via a transmission line L to a fire sensor or the like. Various sensors 4 and various terminals 5
Monitor and control. An annunciator control device A installed in the central monitoring room is connected to the transmission line L, receives a signal from the central monitoring device 3, and operates the various sensors 4 and terminals 5 in the system. Are displayed collectively.

As shown in FIG. 3, the annunciator control device A comprises a display unit 21 including a plurality of display units 21a provided corresponding to the respective sensors 4 and the terminals 5, and the like. Based on the transmitted data,
The display data is determined and the L of the predetermined display unit 21a is determined.
Turn on or blink the ED. This allows a security guard or the like to monitor the status of the system in the central monitoring room. For example, when a fire sensor emits an alarm, an LED or the like of the display unit 21a corresponding to the fire sensor indicates the alarm state.

As shown in FIG. 1, the control unit 1 controls the transmission line L
, A signal is received from the central monitoring device 3, display data is transmitted, and a specified display is performed on the display 2. Serial data transmitted from the control unit 1 is displayed on the display 2. Is converted to parallel data and displayed. As in the prior art, the control unit 1 includes an annunciator control unit 10 for determining display data, and a synchronous serial transmission circuit 11 for transmitting display data transmitted from the annunciator control unit 10 as serial data synchronized with a clock. (Serial transmission circuit). The display 2 has a serial / parallel conversion circuit 20 that converts serial data received from the synchronous serial transmission circuit 11 into parallel data in synchronization with a clock, and a parallel / parallel conversion circuit 20 converted by the serial / parallel conversion circuit 20. A display unit 21 for performing display based on the data.

In the present invention, the serial / parallel conversion circuit 20 transmits the serial data before being converted into parallel data in synchronization with a clock. The synchronous serial receiving circuit 12 (serial receiving circuit) for receiving the serial data transmitted from the conversion circuit 20 compares the serial data transmitted by the synchronous serial transmitting circuit 11 with the serial data received by the synchronous serial receiving circuit 12. And a data comparison unit 13 that performs the operation.

The display 2 further includes a display unit 21 for displaying the parallel data converted by the serial / parallel conversion circuit 20 based on the comparison result of the data comparison unit 13.
An output control unit 22 for controlling the output to the controller is provided. When the annunciator control unit 10 transmits the display data (), the synchronous serial transmission circuit 11 transmits the display data transmitted from the annunciator control unit 10 as serial data synchronized with the clock, as shown in FIG. ). Also, the same serial data is sent to the data comparing unit 13 ().

When the serial / parallel conversion circuit 20 receives the serial data from the synchronous serial transmission circuit 11, as shown in FIG. 4, the serial data before being converted into the parallel data is transmitted as it is in synchronization with the clock. (), Is converted into parallel data in synchronization with the clock and output (). Synchronous serial receiving circuit 12
When receiving the serial data transmitted from the serial / parallel conversion circuit 20, () sends the serial data to the data comparing unit 13 (). The data comparison unit 13 compares the serial data () received from the synchronous serial transmission circuit 11 with the serial data () received by the synchronous serial reception circuit 12, and compares the comparison result with
Output as a signal indicating “match” or “mismatch” ().

The output control section 22 controls the output of the parallel data converted by the serial / parallel conversion circuit 20 to the display section 21 based on the comparison result () of the data comparison section 13. That is, if the comparison result of the data comparison unit 13 is “match”, the output control unit 22 outputs the parallel data at that time to the display unit 21 (), and the display unit 21 outputs the parallel data. The display based on the data is performed, but if the comparison result of the data comparing unit 13 is “mismatch”, the parallel data at that time is not output to the display unit 21.

Thus, the annunciator control device A of the present invention can confirm whether the serial data can be normally transmitted from the serial transmission circuit 11 to the serial / parallel conversion circuit 20 with a simple configuration. Therefore, even if data cannot be transmitted correctly due to the influence of noise or the like as in the related art, there is no case where erroneous data is displayed on the display unit 21, thereby improving the reliability of the system. In addition, since data transmission can be guaranteed without using a complicated circuit or an expensive microcomputer, an increase in manufacturing cost can be suppressed.

FIG. 5 is a block diagram showing another example of the configuration of the main part of the annunciator control device according to the present invention. The annunciator control device A ′ is different from the configuration shown in FIG. 1 in that the control unit 1A receives the comparison result output from the data comparison unit 13A also in the annunciator control unit 10A, and the annunciator control unit 10A When the comparison result is received (), and the received comparison result does not match, the display data is retransmitted to the synchronous serial transmission circuit 11 (). If the comparison results match, the display data is not resent.

As a result, even if the transmission of the serial data is not normal, the same data is retransmitted, and
Correct display can be ensured. Further, although the data transmission from the synchronous serial transmission circuit 11 to the serial / parallel conversion circuit 20 is normal, the data transmission from the serial / parallel conversion circuit 20 to the synchronous serial reception circuit 12 cannot be performed normally. Even when the display is not performed on the unit 21, correct display can be surely performed by retransmitting the display data.

Next, the configuration of the output control unit 22 will be described. The output control unit 22 outputs parallel data when the comparison result of the data comparison unit 13 matches,
While displaying data on the display unit 21, the data comparison unit 1
When the comparison result of No. 3 is not coincident, the data is not displayed on the display unit 21 without outputting the parallel data.

More specifically, the output control unit 22
As schematically shown in (a), a data input terminal for inputting parallel data from the serial / parallel conversion circuit 20, a data output terminal for outputting parallel data to the display unit 21, and an enable signal from the data comparison unit 13 And an enable signal input terminal for inputting the signal.

If the comparison results match, the data comparison unit 13 sets the enable signal to "enable" to open the buffer, while if the comparison results do not match, the data comparison unit 13 sets the enable signal to "disenable" and sets the buffer to "disenable". Set to the closed state. That is, when the data transmission is not normal, the display unit 21 does not perform the display until the data is normally received. As described above, the annunciator control devices A and A ′ of the present invention have a simple configuration.
This prevents erroneous data from being displayed when transmission data is garbled due to noise or the like.

The output control unit 22 is provided with a data comparison unit 1
When the comparison result of No. 3 is coincident, the parallel data is output and the data is displayed on the display unit 21. On the other hand, when the comparison result of the data comparison unit 13 is not coincident,
A configuration in which the same parallel data as the previous time is output and the data is displayed on the display unit 21 may be adopted. Specifically, the output control unit 22 outputs the parallel data to the display unit 21 and the data input terminal for inputting the parallel data from the serial / parallel conversion circuit 20, as schematically shown in FIG. And a latch signal input terminal for inputting a latch signal from the data comparing unit 13.

The data comparing section 13 outputs a latch signal to update the latch data if the comparison result matches, or outputs the latch signal to the latch circuit 22b without outputting the latch signal if the comparison result does not match. Output the last normal data that was retained. That is, the display on the display unit 21 maintains the display based on the data normally received last time without updating the latch data until the normal data is received.

As described above, the annunciator control devices A and A 'of the present invention have a simple configuration to prevent erroneous data from being displayed when transmission data is garbled due to noise or the like. Further, even when the display on the display unit 21 changes over time, the previous display can be maintained without returning to an initial state such as disappearance of the display.

[0029]

As can be understood from the above description, in the annunciator control device according to the first to sixth aspects of the present invention, the serial / parallel conversion circuit returns the received serial data, and Since the serial data is compared with the serial data transmitted to the serial / parallel conversion circuit, and based on the result, the output of the parallel data converted by the serial / parallel conversion circuit to the display unit is controlled. In the configuration, serial /
It is possible to confirm whether serial data has been normally transmitted to the parallel conversion circuit.

Therefore, even if the data cannot be transmitted correctly due to the influence of noise or the like as in the prior art,
There is no case where incorrect data is displayed on the display unit, and the reliability of the system is improved. In addition, since data transmission can be guaranteed without using a complicated circuit or an expensive microcomputer, an increase in manufacturing cost can be suppressed. In particular, according to the second aspect, when normal data transmission cannot be performed, the display data is retransmitted, so that the display can be performed reliably.

According to the third aspect of the present invention, when normal data transmission cannot be performed, no data is displayed on the display unit. Therefore, even if transmission data is garbled due to noise or the like, incorrect data is not displayed. According to the fourth aspect, when the normal data transmission cannot be performed, the same data as the previous data is displayed on the display unit. Therefore, even if the transmission data is garbled due to noise or the like, incorrect data is not displayed. Further, since the previous display is maintained, the display does not return to the initial state.

According to the fifth aspect, with a simple configuration using a three-state buffer circuit, when normal data transmission cannot be performed, incorrect data is prevented from being displayed. According to the sixth aspect, with a simple configuration using a latch circuit, when normal data transmission cannot be performed, incorrect data is prevented from being displayed. Further, since the previous display is maintained, the display does not return to the initial state.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an example of a main configuration of an annunciator control device according to the present invention.

FIG. 2 is a diagram illustrating an example of a configuration of a building automation system.

FIG. 3 is a diagram illustrating an example of an external appearance of an annunciator control device.

FIG. 4 is a diagram illustrating an example of serial data transmitted.

FIG. 5 is a block diagram showing an example of the configuration of another main part of the annunciator control device of the present invention.

FIG. 6 is a diagram illustrating an example of a configuration of an output control unit.

FIG. 7 is a block diagram showing a main part configuration of a conventional annunciator control device.

[Explanation of symbols]

 A, A ′ Annunciator control device 1, 1A control unit 10, 10A Annunciator control unit 11 Synchronous serial transmission circuit 12 Synchronous serial reception circuit 13, 13A Data comparison unit 2 Display 20 Serial / parallel conversion circuit 21 Display unit 22 Output control unit 22a 3-state buffer circuit 22b Latch circuit

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference)

Claims (6)

[Claims] 1. An annunciator control unit for determining display data, a serial transmission circuit for transmitting display data transmitted from the annunciator control unit as serial data, and a serial data received from the serial transmission circuit in parallel. An annunciator control device comprising: a serial / parallel conversion circuit for converting data; and a display unit for performing display based on the parallel data converted by the serial / parallel conversion circuit. Transmitting serial data before being converted to parallel data, receiving a serial data transmitted from the serial / parallel conversion circuit, serial data transmitted by the serial transmission circuit, Received by the above serial receiving circuit A data comparing unit that compares the serial data with the serial data, and an output control unit that controls output of the parallel data converted by the serial / parallel conversion circuit to the display unit based on the comparison result of the data comparing unit. Equipped annunciator control device. 2. The annunciator control unit receives a comparison result from the data comparison unit, and retransmits display data to the serial transmission circuit when the comparison result does not match. The annunciator control device according to claim 1, wherein 3. The output control section outputs the parallel data and displays the data on the display section when the comparison result of the data comparison section is coincident, while displaying the comparison result of the data comparison section. 3. The annunciator control device according to claim 1, wherein, when the numbers do not match, the parallel data is not output, and the data is not displayed on the display unit. 4. 4. The output control section outputs the parallel data and displays the data on the display section when the comparison result of the data comparison section is coincident. 3. If the numbers do not match, the same parallel data is output as before, and the data is displayed on the display section.
The annunciator control device according to claim 1. 5. An output control unit comprising: a data input terminal for inputting parallel data from the serial / parallel conversion circuit; a data output terminal for outputting parallel data to the display unit; and an enable signal from the data comparison unit. 2. A three-state buffer circuit comprising an enable signal input terminal for inputting a signal.
Or the annunciator control device according to claim 2. 6. A data input terminal for inputting parallel data from the serial / parallel conversion circuit, a data output terminal for outputting parallel data to the display unit, and a latch signal from the data comparison unit. 3. The annunciator control device according to claim 1, comprising a latch circuit having a latch signal input terminal for inputting a signal.