JP3441518B2 - Elevator signal transmission equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an elevator signal transmission device.

[0002]

2. Description of the Related Art The configuration of a conventional elevator signal transmission device will be described with reference to FIG. FIG. 11 shows
For example, it is a block diagram showing a configuration of a conventional elevator signal transmission device disclosed in Japanese Patent Laid-Open No. 3-256983.

In FIG. 11, a control panel 1 provided in a machine room of an elevator includes a serial transmission interface (hereinafter referred to as "UART"), a parallel port,
A master station microcomputer 2 for communication control having a built-in timer and the like, and a UART 3 added to the master station microcomputer 2 are provided.

Further, in FIG. 11, the hall operation panel on each floor of the building has a child station microcomputer 4 of a hall having a built-in UART, a parallel port, a timer and the like, and a hall call button lamp 6 for displaying a hall call registration. , And a hall call button 7. A hall indicator 5 is provided at the hall. In addition, the hall call button light 6 and the hall call button 7 are UP.
There are two directions, the DOWN direction and the DOWN direction, but they are omitted as one in the figure.

Further, in FIG. 11, the elevator car 8 is provided with a car slave station microcomputer 9, a car operation panel 10 and a car indicator 11. Further, the master station microcomputer 2 and the slave station microcomputer 4 at the hall are connected by a serial signal transmission line 12 and a serial signal reception line 13, respectively, and signal transmission between the control panel 1 and the hall is performed by these serial signal transmission lines 12. And the serial signal receiving line 13 are used. Similarly, UART
3 and the slave station microcomputer 9 of the car are connected by a serial signal transmission line 14 and a serial signal reception line 15, respectively, and signal transmission between the control panel 1 and the equipment of the car 8 is performed by these serial signal transmission line 14 and the serial signal. This is performed using the reception line 15.

Next, the operation of the conventional elevator signal transmission device will be described with reference to FIG. Figure 1
2 is a communication diagram showing a conventional elevator signal transmission system, and shows a serial signal group transmitted and received between the master station and the slave station in time series.

In FIG. 12, the upper part shows a group of data DA to be transmitted from the master station microcomputer 2 to the slave station microcomputer 4 or 9 such as indicator display signals and button lamp lighting signals, and the lower part shows button signals and switch signals. A reply data group DB from the slave station microcomputer 4 or 9 to the master station microcomputer 2 is shown. In this conventional example, the transmission data "1" to "16" and the reply data "1" to "16" are 1-byte data, respectively, and 16 bytes of data are transmitted and received in one transmission cycle.

Now, as shown in FIG. 12, the master station microcomputer 2 is programmed so as to insert a time (hereinafter referred to as "no signal time") during which no communication indicated by A to D is performed in one cycle of serial transmission. Has been done. Then, the slave station microcomputer 4 or 9 detects the non-signal times A to D and determines the data immediately after that (that is, the transmission data “1”) as the head data of one transmission cycle.
This establishes the synchronization of the communication between the master station and the slave station.

[0009]

Since the conventional elevator signal transmission device is constructed as described above, it has the following problems.

First, in order for the slave station microcomputer 4 or 9 to detect the head data of one transmission cycle of serial transmission, for example, synchronization information such as a signalless time A to D having a constant width is transmitted to the master station microcomputer. 2 must be inserted, and data cannot be transmitted when the synchronization information is transmitted. As a result, the number of data that can be transmitted in one transmission cycle decreases, and the communication efficiency decreases.

Next, all the transmission data groups of the master station microcomputer 2 have the same signal potential, and the slave station microcomputer 4 or 9 selects special data (for example, the slave station microcomputer 4 from the transmission data group). Or a parameter for controlling the device connected to 9,
It is difficult to extract with a high reliability, such as those that have a significant effect on the operation of the slave station microcomputer 4 or 9. For example, assuming that the position at which the master station microcomputer 2 transmits the special data is fixed in one transmission cycle of communication, the slave station microcomputer 4 or 9 synchronizes with the synchronization signal such as the signalless time A to D described above. The number of subsequent data is counted, and the data at the prearranged position is determined to be special data, and the determination is easily erroneous due to a mistake in detecting the synchronization signal or the like. A method of using special data (for example, “F0”, “F1”, and the like where the upper rank is “F” as special data) as special data is also conceivable. In the example, the data of the upper rank F) cannot be used for normal data.

The present invention has been made in order to solve the above problems, and a slave station microcomputer converts special data from another serial data group from a serial signal group transmitted from the master station microcomputer. An object of the present invention is to obtain an elevator signal transmission device that can be distinguished easily and with high reliability.

Another object of the present invention is to obtain a signal transmission device for an elevator that can establish serial communication synchronization without reducing communication efficiency by using the special data as a synchronization signal.

[0014]

In a signal transmission device for an elevator according to the present invention, a control panel and a hall or a car operation panel are connected through a serial communication line, and the control panel is one transmission composed of a plurality of bytes. In the case of the 1st byte of the transmission data of the cycle, the H level is output,
In the case of the data of the second byte and thereafter, the master station microcomputer which outputs the L level , and the transmission data from the master station microcomputer based on the H level are converted into a signal level of 15V for serial communication, and A first signal voltage level conversion circuit for transmitting to a serial communication line,
A second signal voltage level conversion circuit for converting the transmission data from the master station microcomputer to a signal level of 10V for serial communication based on the L level and transmitting the signal level to the serial communication line. , The operation panel is
Of the transmission data sent through the serial communication line
When the signal level of 15V is detected, it is judged that it is the first byte of the transmission data of one transmission cycle and H level is output. When the signal level of 10V is detected, the second of the transmission data of one transmission cycle is detected. L level after judging that it is after the byte
And the signal voltage level detecting circuit for outputting Le, the signal voltage
Communication synchronization is established based on the H level output by the level detection circuit , and the signal voltage level detection circuit is used.
It is provided with a slave station microcomputer that acquires transmission data of one transmission cycle sent based on the output H level and L level and controls the own station device.

Further, in the elevator signal transmission device according to the present invention, the control panel and the hall or the car operation panel are connected through a serial communication line, and the control panel is composed of a plurality of bytes of transmission data of one transmission cycle. In the case of the data of the first byte , the L level is set to bit0 of the input / output port.
Bell, H level is output to bit1 and L level is output to bit2 .
H level for bit0, L level for bit1, and bit2
When L level is output and the data is out of the one transmission cycle , the L level is set to bit0 and the L level is set to bit1 of the input / output port.
Bell, a master station microcomputer that outputs H level to bit2, and bit0 of the input / output port is L level,
a first signal voltage level conversion circuit for converting transmission data from the master station microcomputer into a signal level of 15V for serial communication based on bit1 being H level and bit2 being L level , and transmitting the signal to the serial communication line; The above
I / O port bit0 is H level, bit1 is L level
Based on the L level , the transmission data from the master station microcomputer of 10V of serial communication
A second signal voltage level conversion circuit for converting to a signal level and transmitting it to the serial communication line; and b of the input / output port
it0 is L level, bit1 is L level, bit2 is H level
A third signal voltage level conversion circuit for converting the operating parameter of the slave station microcomputer from the master station microcomputer to a -15V signal level for serial communication based on the level and transmitting the signal level to the serial communication line. At the same time, when the operation panel detects a signal level of 15V of the transmission data sent through the serial communication line, it determines that it is the first byte of the transmission data of one transmission cycle and outputs the H level. , 10V signal level
A first signal voltage level detection circuit which outputs an L level it is determined that if it detects the Le a second and subsequent bytes of the transmitted data of one transmission cycle, transmission data transmitted via the serial communication line a second signal voltage level detecting circuit for outputting a H level when it detects a signal level of -15V of it is determined that the operating parameters of the child station microcomputer, the first signal voltage level detection times
Communication synchronization is established based on the H level output by the path, and is output by the first signal voltage level detection circuit.
Acquires the transmission data of the first transmission cycle sent based on the H level and L level are to control the own station equipment, the
The H level output by the second signal voltage level detection circuit
And a slave station microcomputer that acquires the operation parameter of the slave station microcomputer outside one transmission cycle sent based on the above-mentioned protocol and stores it in the memory of the slave station.

[0016]

[0017]

[0018]

[0019]

In the elevator signal transmission device according to the present invention, the master station microcomputer outputs the H level in the case of the first byte data of the transmission data of one transmission cycle composed of a plurality of bytes. However, in the case of the data of the second byte and thereafter, the L level is output, and the first
The signal voltage level conversion circuit converts the transmission data from the master station microcomputer into a signal level of 15V for serial communication based on the H level and transmits the signal level to the serial communication line to convert the second signal voltage level. A circuit transmits the transmission data from the master station microcomputer based on the L level to a 10 V signal for serial communication.
The level is converted and transmitted to the serial communication line. In addition, the signal voltage level detection circuit causes a 15V signal level of the transmission data transmitted through the serial communication line.
When detecting the Le outputs the H level it is determined that the first byte of the transmission data of the first transmission period, 10V signal
When the level is detected, the second transmission data of one transmission cycle
The L level is output after judging that it is after the byte and the signal voltage level is detected by the slave station microcomputer.
Communication synchronization is established based on the H level output by the circuit, and output by the signal voltage level detection circuit.
The local station device is controlled by acquiring the transmission data of one transmission cycle sent based on the H level and the L level .

Further, in the elevator signal transmission device according to the present invention, the master station microcomputer inputs / outputs the data of the first byte of the transmission data of one transmission cycle composed of a plurality of bytes. port
Bit0 of L level, bit1 of H level, bit2
L level is output to the second byte, and in the case of the data of the second and subsequent bytes, the input / output port bit0 is set to H level and bit1 is set to L level.
L level is output to the bit and bit2, and if the data is out of the one transmission cycle, the L level is output to the bit0 of the input / output port.
The L level is output to bit1, the H level is output to bit2, and the input / output is performed by the first signal voltage level conversion circuit.
Port bit0 is L level, bit1 is H level, b
Based on the L level of it2, the transmission data from the master station microcomputer is transferred to the 15V signal level of the serial communication.
The signal is converted into a bell and transmitted to the serial communication line, and the second signal voltage level conversion circuit causes the input / output port bi
t0 is H level, bit1 is L level, bit2 is L level
Based on the bell , the transmission data from the master station microcomputer is converted into a signal level of 10V for serial communication and transmitted to the serial communication line, and the third signal voltage level conversion circuit causes the bit0 of the input / output port to change. L level
Based on the L level of bit1, the H level of bit2, and the operating parameter of the slave station microcomputer from the master station microcomputer for serial communication of -1.
The signal level is converted to 5V and transmitted to the serial communication line. Further, the first signal voltage level detecting circuit, the transmission data transmitted via the serial communication line 1
When the signal level of 5V is detected, it is judged that it is the first byte of the transmission data of one transmission cycle and the H level is output. When the signal level of 10V is detected, the second of the transmission data of one transmission cycle is detected. L level after judging that it is after the byte
Outputs Le, the second signal voltage level detecting circuit, the transmission data transmitted via the serial communication line -
When the signal level of 15V is detected, it is determined that the operating parameter of the slave station microcomputer is the H level.
Outputs Le, the slave station microcomputer, the first
Establishing a communication synchronization based on H level <br/> output by the first signal voltage level detecting circuit, the first signal voltage les
The transmission data of one transmission cycle sent based on the H level and the L level output by the bell detection circuit is acquired to control the own station device, and to detect the second signal voltage level.
1 sent based on the H level output by the road
The operating parameters of the slave station microcomputer outside the transmission cycle are acquired and stored in the local station memory.

[0021]

[0022]

[0023]

[0024]

【Example】

Example 1. The configuration of an embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a diagram showing the configuration of an embodiment of the present invention. In each figure, the same reference numerals indicate the same or corresponding parts.

In FIG. 1, a control panel 1 includes a main CPU 16 of an elevator and a 2-port RAM 1 provided between the main CPU 16 and the master station microcomputer 2.
7, a master station microcomputer 2 for controlling communication,
A signal voltage level conversion circuit 21 including a conversion driver 22 and a receiver 23, a signal voltage level conversion circuit 24 including a 3-state output driver, and an inverter for controlling the state of the conversion driver 22 and the driver of the signal voltage level conversion circuit 24. And a gate 25.

Further, in FIG. 1, the master station microcomputer 2 has an input / output port 18 for controlling the signal voltage level of the serial signal transmission line 12, and a UAR for landing side communication.
It incorporates T19 and UART 20 for car side communication.

The signal voltage level conversion circuit 21 includes a UART.
The input / output levels 0V and 5V of 19 and the input / output levels 0V and 10V of serial communication are bidirectionally converted, and the output of the conversion driver 22 is high impedance, 10V level, 0.
There are 3 states of V level. In addition, the signal voltage level conversion circuit 24 controls the input / output level 0 of the UART 19.
The V and 5V are converted into output levels 0V and 15V for serial communication.

Further, in FIG. 1, the hall operation panel 26
Detects the signal voltage level of the serial signal transmission line 12, and the signal voltage level of the serial signal transmission line 12 is 0V,
A signal voltage level detection circuit 2 configured to output the H level of the TTL logic at 15V and the L level of the TTL logic at the signal voltage levels of 0V and 10V.
7, a signal voltage level conversion circuit 28 similar to the signal voltage level conversion circuit 21 of the master station, and a slave station microcomputer 4.

The slave station microcomputer 4 has an input / output port 29 to which the signal voltage level detection circuit 27 is connected,
UART 30 to which the signal voltage level conversion circuit 28 is connected
And built in.

Although the car-side serial communication system is omitted in FIG. 1, the car-side serial communication system is improved in the same manner as the landing side, as compared with FIG. 11 of the conventional example. .

Next, the operation of this embodiment will be described with reference to FIGS. 2, 3, 4 and 5.

The basic processing of the master station microcomputer 2 is performed by communicating with the main CPU 16, the slave station microcomputer 4 at the hall, and the slave station microcomputer 9 of the car.
Communication with the main program, 2-port RAM
The program configuration is such that reading / writing from / to 17 is performed, a built-in timer is activated to generate a timer interrupt, and communication processing with each slave station microcomputer 4 or 9 is performed in the timer interrupt processing.

FIG. 2 is a flow chart of the main program of the master station microcomputer 2. However, the main program of the master station microcomputer 2 is not directly related to the characteristic part of the present invention and will be briefly described.

In step 40, the memory is cleared and the built-in input / output port 18, UART 19, 2
0, timer, interrupt controller, etc. are initialized. Next, in steps 41 to 44, after the timer interrupt is prohibited, the data is read from the 2-port RAM 17, the serial transmission data is processed, and the timer interrupt is permitted.

In steps 45 to 47, after the serial transmission / reception for one transmission cycle is completed, the serial reception data is processed to be sent to the main CPU 16, and the 2-port RA is processed.
The serial reception data is written to M17. In addition,
In step 45, it is determined whether or not one transmission / reception cycle for serial transmission / reception has been completed. However, as will be described later, a flag is set when one transmission / reception cycle has been completed in the timer interrupt program. This flag is determined.

FIG. 3 is a flowchart of the timer interrupt program of the master station microcomputer 2.

In the timer interrupt program, first,
In step 50, it is determined whether or not all serial transmissions for one transmission cycle have been completed. If all the serial transmissions for one cycle are completed, the transmission is not performed until the process branches to step 54 and moves to the next transmission cycle.

If the transmission for one cycle is not completed in step 51, it is judged whether or not it is the data of the first byte, and if it is the data of the first byte, the input / output port is determined in the next step 52. The H level is output to bit 1 of 18 to enable the output of the conversion driver 22 of the signal voltage level conversion circuit 21 to be high impedance and the output of the signal voltage level conversion circuit 24 to be enabled. That is, data is output to the serial signal transmission line 12 at signal levels of 0V and 15V.

If it is normal data other than the first byte, the bit 0 of the input / output port 18 is set to H at step 53.
The level is output, the output of the conversion driver 22 of the signal voltage level conversion circuit 21 is enabled, and the output of the signal voltage level conversion circuit 24 is set to high impedance. That is, data is output to the serial signal transmission line 12 at signal levels of 0V and 10V.

In steps 54 to 57, if a reply from the slave station microcomputer 4 is received, data reception processing is performed. If serial transmission / reception for one transmission cycle is completed, serial transmission / reception 1 cycle completion flag is set. To return to the main program.

FIG. 4 is a flow chart of a program incorporated in the slave station microcomputer 4.

In step 60, the memory is cleared and the built-in input / output port 29, UART 30, timer and the like are initialized, and then in step 61, serial data reception is awaited.

In steps 62 to 64, when serial data is received, the data is read from bit0 of the input / output port 29 to which the signal voltage level detection circuit 27 is connected, and if it is H level, the first byte of one transmission cycle. Then, the serial communication counter is reset and the synchronization establishment flag is set. That is, the synchronization of serial communication is established between the master station microcomputer 2 and the slave station microcomputer 4 by the processing of steps 63 and 64.

If it is L level in the judgment of step 63, it is judged that it is data other than the first byte of one transmission cycle, and the counter of serial communication number is not reset and the synchronization establishment flag is not set. .

At step 65, it is confirmed whether or not the communication synchronization is established. If the synchronization is established, the serial communication counter determines the number of data in one transmission cycle at the next steps 66 and 67. Confirmation is performed, and transmission / reception processing of communication data according to the count value is performed. When the transmission / reception of one byte is completed, the serial communication counter is incremented in step 67 to prepare for the next received data.

In steps 69 to 70, the master station microcomputer 2 that controls devices such as indicators connected to the local station by serial reception data, button data, etc.
Capture data for serial transmission to.

FIG. 5 shows one transmission cycle of transmission of the master station microcomputer 2 in this embodiment, where the horizontal axis represents time and the vertical axis represents signal voltage level.

That is, only the first byte is transmitted to the slave station microcomputer 4 with L side 0V and H side 15V. Then, by transmitting the second and subsequent bytes at 0V on the L side and 10V on the H side, the slave station microcomputer 4
Can detect the leading data of one transmission cycle, and can establish the synchronization of communication with the master station microcomputer 2.

Example 2. Next, the configuration of another embodiment of the present invention will be described with reference to FIG. Figure 6
FIG. 6 is a diagram showing the configuration of another embodiment of the present invention.

In FIG. 6, the control panel 1 further includes a signal voltage level conversion circuit 31 having a built-in driver for three-state output similarly to the signal voltage level conversion circuit 24.

The signal voltage level conversion circuit 31 includes a UART.
The input / output levels 0 and 5V of 19 are converted into output levels 0V and -15V of serial communication.

Further, in FIG. 6, the hall operating panel 26 is
Instead of the signal voltage level detection circuit 27, the signal voltage level of the serial signal transmission line 12 is detected, and when the signal voltage levels of the serial signal transmission line 12 are 0V and 15V, TTL is used.
The signal voltage level detection circuit 32 configured to output the L level of the TTL logic when the logic H level and the signal voltage level are 0 V and 10 V, and the signal voltage level of the serial signal transmission line 12 are detected, and the serial signal transmission line 12 is detected. When the signal voltage levels of the signal transmission line 12 are 0V and -15V, TTL
A signal voltage level detection circuit 33 configured to output an H level of logic and an L level of TTL logic when the signal voltage level is 0 V or higher.

Next, the operation of the other embodiment will be described with reference to FIGS. 7, 8, 9 and 10.

In the above-described first embodiment, an example in which the master station microcomputer 2 changes the signal transmission level in two steps to establish communication synchronization has been described.
In the following, an example will be described in which the master station microcomputer 2 changes the signal transmission level in three steps to establish communication synchronization and changes the operation parameter of the slave station microcomputer 4.

Similar to the first embodiment, the basic processing of the master station microcomputer 2 is communication with the main CPU 16, communication with the slave station microcomputer 4 at the hall, and communication with the slave station microcomputer 9 of the car. , A program configuration for reading / writing to / from the 2-port RAM 17 by a main program, activating a built-in timer to generate a timer interrupt, and performing communication processing with each slave station microcomputer 4 or 9 during timer interrupt processing. Has become.

FIG. 7 is a flow chart of the main program of the master station microcomputer 2.

In addition to the same processing as in the first embodiment, it is determined in step 48 whether or not the operating parameter of the slave station microcomputer 4 needs to be changed, and if necessary, the bit 0 of the input / output port 18 is set in step 49. L level, bit
The L level is output to 1 and the H level is output to bit2, only the signal voltage level conversion circuit 31 is enabled, and the signal voltage levels are 0V and -15V to the microcomputer 4 of the slave station.
To send the operation parameter data.

FIG. 8 is a flowchart of the timer interrupt program of the master station microcomputer 2.

Step 52 compared with the case of the first embodiment
Processing of A and 53A is different. First as a synchronization signal
When transmitting a byte, in step 52A, the bit0 of the input / output port 18 is at the L level, the bit1 is at the H level, and b is transmitted.
It outputs the L level to it2, and the signal voltage level conversion circuit 2
Only 4 is enabled, and the first byte, that is, the synchronization signal is transmitted to the microcomputer 4 of the slave station at signal voltage levels of 0V and 15V.

Further, when transmitting normal data other than the first byte, at step 53A, the bi of the input / output port 18 is set.
H level is output to t0, L level is output to bit1, L level is output to bit2, only the conversion driver 22 of the signal voltage level conversion circuit 21 is enabled, and the normal voltage of the signal voltage level of 0V and 10V is supplied to the microcomputer 4 of the slave station. To send.

FIG. 9 is a flow chart of a program incorporated in the slave station microcomputer 4.

Compared with the first embodiment, steps 71, 72,
The process of 63A is different. Input / output port 2 to which the signal voltage level detection circuits 32 and 33 are connected in step 62
Data from bit0 and bit1 of 9 is read, and if bit0 is L level and bit1 is H level in step 71, it is determined that the received data is operation parameter data, and the parameter data received in step 72 is set to the own station. Store in memory.

Also, bit0 is at H level and bit1 is at L level.
If it is a level, it is judged that it is the data of the first byte of one transmission cycle, and in step 64, the counter of the serial communication number is reset and the synchronization establishment flag is set.

FIG. 10 shows one transmission cycle of normal transmission of the master station microcomputer 2 and the transmission of operation parameters to the slave station in the second embodiment. As in FIG. 5, the horizontal axis represents time and the vertical axis. Indicates the signal voltage level.

That is, only the first byte of the normal transmission is transmitted to the slave station microcomputer 4 with the L side 0V and the H side 15V, and the second and subsequent bytes are transmitted to the L side 0V and the H side 10V.
By transmitting with, the microcomputer 4 of the slave station can detect the head data of one transmission cycle,
Communication synchronization with the master station microcomputer 2 can be established.

In addition to the normal transmission cycle, the L side 0
By transmitting to the slave station microcomputer 4 at -15V on the V and H sides, the slave station microcomputer 4 can receive the operation parameter data of its own station while distinguishing it from other data.

In each of the above embodiments, the conversion potential of the signal voltage level conversion circuit is changed to TTL ← → “0V, 10V”, “0V,
15V "and" 0V, -15V "have been described, but other potentials may be used as long as the transmission quality can be maintained, and the same effect as each of the above-described embodiments can be obtained.

[0068]

As described above, in the elevator signal transmission apparatus according to the present invention, the control panel and the hall or the car operation panel are connected through the serial communication line, and the control panel is composed of a plurality of bytes. Based on the H level , the master station microcomputer that outputs the H level for the first byte of the transmission data of the transmission cycle, and outputs the L level for the data of the second and subsequent bytes. And a first signal voltage level conversion circuit for converting transmission data from the master station microcomputer into a signal level of 15V for serial communication and transmitting the signal level to the serial communication line; and the master station microcomputer based on the L level. Transmitted data from the serial communication 10V signal
A second signal voltage level conversion circuit for converting the level into a level and transmitting the level to the serial communication line, and the operation panel detects a signal level of 15V of the transmission data sent through the serial communication line. Outputs the H level when it is judged that it is the first byte of the transmission data of one transmission cycle, and when a signal level of 10V is detected, the second byte and later of the transmission data of one transmission cycle is detected. Judge that there is
And the signal voltage level detecting circuit for outputting a L level, the signal
Signal voltage level detection circuit for establishing communication synchronization based on the H level output by the signal voltage level detection circuit.
Since there is a slave station microcomputer that controls the own station device by acquiring the transmission data of one transmission cycle sent based on the H level and the L level output by the It is not necessary for the master station microcomputer to insert such synchronization information, and it is possible to perform efficient communication.

As described above, in the elevator signal transmission device according to the present invention, the control panel and the hall or the car operation panel are connected through the serial communication line, and the control panel is composed of a plurality of bytes. Of the transmission data of the transmission cycle, if it is the first byte of data, the input / output port
L level at bit0, H level at bit1, and bi
The L level is output at t2, and in the case of the data of the second and subsequent bytes, the bit0 of the input / output port is set to the H level and the bit1 is set.
The L level is output to the L level and the bit2, and when the data is out of the one transmission cycle, the L level is output to the bit0 of the input / output port.
Bell, a master station microcomputer outputting L level to bit1 and H level to bit2, and the input / output port
bit0 is L level, bit1 is H level, and bit2 is
A first signal voltage level conversion circuit for converting the transmission data from the master station microcomputer into a signal level of 15V for serial communication based on the L level and transmitting it to the serial communication line, and bit0 of the input / output port are H level
A second signal voltage level conversion circuit for converting the transmission data from the master station microcomputer into a signal level of 10 V for serial communication and transmitting the signal to the serial communication line based on L level of bit1, bit1 of L level, and bit2 of L level. When,
The input / output port bit0 is at L level, and bit1 is at L level.
A third level for converting the operating parameter of the slave station microcomputer from the master station microcomputer into a signal level of -15V for serial communication based on the level, bit2 being H level , and transmitting the signal level to the serial communication line. With the signal voltage level conversion circuit of, the operation panel,
Of the transmission data sent through the serial communication line
When the signal level of 15V is detected, it is judged that it is the first byte of the transmission data of one transmission cycle and H level is output. When the signal level of 10V is detected, the second of the transmission data of one transmission cycle is detected. L level after judging that it is after the byte
And a first signal voltage level detection circuit for outputting the signal, and -15 of the transmission data sent through the serial communication line.
When a V signal level is detected, it is determined that the signal is an operating parameter of the slave station microcomputer, and a second signal voltage level detection circuit for outputting an H level is provided ;
Communication synchronization is established based on the H level output by the signal voltage level detection circuit , and the first signal voltage level is set.
The transmission data of one transmission cycle transmitted based on the H level and the L level output by the detection circuit is acquired to control the own station device, and the second signal voltage level detection circuit is provided.
Since it has a slave station microcomputer that acquires the operation parameter of the slave station microcomputer outside one transmission cycle sent based on the H level output from the device and stores it in its own memory, There is no need for the master station microcomputer to insert synchronization information such as signal time, efficient communication is possible, and special data such as operating parameters of slave station microcomputers are transmitted with high reliability. Therefore, the slave station microcomputer side can easily detect the special data.

[0070]

[0071]

[0072]

[Brief description of drawings]

FIG. 1 is a block diagram showing an elevator signal transmission device according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing a main program of a master station microcomputer in the signal transmission device for an elevator according to the first embodiment of the present invention.

FIG. 3 is a flowchart showing a timer interrupt program of the master station microcomputer in the elevator signal transmission device according to the first embodiment of the present invention.

FIG. 4 is a flowchart showing a program of a slave station microcomputer in the signal transmission device for an elevator according to the first embodiment of the present invention.

FIG. 5 is a signal waveform diagram showing one cycle of transmission data of the master station microcomputer in the elevator signal transmission device according to the first embodiment of the present invention.

FIG. 6 is a block diagram showing a signal transmission device for an elevator according to a second embodiment of the present invention.

FIG. 7 is a flowchart showing a main program of the master station microcomputer in the elevator signal transmission device according to the second embodiment of the present invention.

FIG. 8 is a flowchart showing a timer interrupt program of the master station microcomputer in the elevator signal transmission device according to the second embodiment of the present invention.

FIG. 9 is a flowchart showing a program of a slave station microcomputer in the elevator signal transmission device according to the second embodiment of the present invention.

FIG. 10 is a signal waveform diagram showing one cycle of transmission data of the master station microcomputer in the elevator signal transmission device according to the second embodiment of the present invention.

FIG. 11 is a block diagram showing a conventional elevator signal transmission device.

FIG. 12 is a diagram showing one cycle of communication between a master station microcomputer and a slave station microcomputer of a conventional elevator signal transmission device.

[Explanation of symbols]

1 control panel, 2 master station microcomputer, 4 slave station microcomputer, 19,30 UART (communication interface), 21, 24, 31, 28 signal voltage level conversion circuit, 27, 32, 33 signal voltage level detection circuit.

Claims (2)

(57) [Claims] 1. A control panel and a hall or a car operation panel are connected through a serial communication line, and the control panel is the first byte data of the transmission data of one transmission cycle composed of a plurality of bytes. Outputs an H level, and outputs an L level in the case of the data of the second byte and thereafter, and transmits the transmission data from the master station microcomputer based on the H level in a serial communication of 15V. A first signal voltage level conversion circuit for converting to a signal level and transmitting the signal to the serial communication line; and a signal level of 10 V for serial communication of transmission data from the master station microcomputer based on the L level. and a second signal voltage level conversion circuit for converting to the serial communication line and transmitting the serial signal to the serial communication line. Of the transmitted data that has been sent through the line
When the signal level of 15V is detected, it is judged that it is the first byte of the transmission data of one transmission cycle and H level is output. When the signal level of 10V is detected, the second of the transmission data of one transmission cycle is detected. L level after judging that it is after the byte
And the signal voltage level detecting circuit for outputting a le to establish communication synchronization based on H level <br/> outputted by the signal voltage level detection circuit, the signal voltage level detection
An elevator signal transmission device comprising: a slave station microcomputer that acquires transmission data of one transmission cycle transmitted based on the H level and the L level output from an output circuit and controls a local station device. 2. A control panel and a hall or car operation panel are connected via a serial communication line, and the control panel is the first byte data of the transmission data of one transmission cycle composed of a plurality of bytes. Is input / output port b
it0 the L level, H level bit1, the bi t2 L
The level is output, and if the data is the second byte or later, input
Output port bit0 is at H level, and bit1 is at L level.
L level is output to bit 2 of the input / output port and L level is output to bit 0 of the input / output port when the data is out of the one transmission cycle .
A master station microcomputer that outputs an L level to bit1 and an H level to bit2, and bit0 of the input / output port is L level and bit1 is H level.
Based on the level, bit2 is the L level , the transmission data from the master station microcomputer is transmitted in the serial communication 15
A first signal voltage level conversion circuit for converting the signal level to V and transmitting the signal to the serial communication line, and bit0 of the input / output port is at H level and bit1 is at L level.
Based on the level, bit2 is the L level , the transmission data from the master station microcomputer is transmitted in the serial communication 10
A second signal voltage level conversion circuit for converting to a V signal level and transmitting the signal to the serial communication line, and bit0 of the input / output port is at L level and bit1 is at L level.
A third level for converting the operating parameter of the slave station microcomputer from the master station microcomputer into a signal level of -15V for serial communication based on the level, bit2 being H level , and transmitting the signal level to the serial communication line. And a signal voltage level conversion circuit of, the operation panel, of the transmission data sent through the serial communication line.
When the signal level of 15V is detected, it is judged that it is the first byte of the transmission data of one transmission cycle and H level is output. When the signal level of 10V is detected, the second of the transmission data of one transmission cycle is detected. L level after judging that it is after the byte
And a first signal voltage level detection circuit for outputting a transmission signal transmitted through the serial communication line.
When a signal level of -15V is detected, it is determined that the operating parameter of the slave station microcomputer is the H level.
A second signal voltage level detection circuit for outputting a bell, and H output by the first signal voltage level detection circuit
Establishing synchronization of communication based on the level , the first signal
H level and L level output by the voltage level detection circuit
The transmission data of one transmission cycle sent based on the bell is acquired to control the own station device, and the second signal voltage level
Signal transmission of an elevator equipped with a slave station microcomputer that acquires operating parameters of the slave station microcomputer outside one transmission cycle sent based on the H level output by the detection circuit and stores it in its own memory apparatus.