JP3672979B2 - Intercom data identification method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an interphone data identification method, and more particularly to an interphone data identification method for identifying data based on an actual value by measuring a data unit length.
[0002]
[Prior art]
Conventionally, an interphone apparatus as shown in FIG. 5 is known as one of interphone data identification methods.
In this intercom apparatus, a master unit M ′ and a plurality of slave units S ₁ ′, S ₂ ′,..., S ₈ ′ are bus-connected by common lines L ₁ ′, L ₂ ′. A data transmission circuit 54 and a data reception circuit 55 are provided, and the slave unit S ₁ ′ is provided with a CPU 63, a data transmission circuit 64, and a data reception circuit 65 (here, the slave unit is 8 Suppose it is connected).
[0003]
A data transmission circuit 54 and a data reception circuit 55 are connected to the CPU 53 of the parent device M ′, and similarly, a data transmission circuit 64 and a data reception circuit 65 are connected to the CPU 63 of the child device S ₁ ′. The master unit M 'data transmission circuit 54 of the common line L _1' 'is connected to the data reception circuit 65 of the slave unit S _1' handset S ₁ via the data transmission circuit 64 of via the common line L ₂ ' And connected to the data receiving circuit 55 of the base unit M ′.
[0004]
Incidentally, in the above description it has been described the configuration of the slave unit S ₁ ', has the same configuration in other slave unit. Therefore, the other of the slave unit S ₂ the description of the _{', S 3' ..., S} 8 ' omitted.
As a control method of this apparatus, there is a control pattern as shown in FIG. 4A, and a start bit ▲ 1 with a period T seconds (1 mS when the data communication speed is 1000 bits / second) as a basic unit (1 bit). , And data bits (2), (3), (4), and (5).
[0005]
In a system in which a master unit M ′ and a plurality of slave units S ₁ ′, S ₂ ′,..., S ₈ ′ are wired in a common line through common lines L ₁ ′ and L ₂ ′, the master unit M ′ is a slave unit S _The control pattern necessary for controlling ₁ ′ is sent from the data transmission circuit 54 to the slave device S ₁ ′ by the CPU 53 of the master device M ′.
For example, in the control pattern shown in FIG. 4A, the start bit {circle around (1)} is composed of two “H” levels. Data bits {circle over (2)}, {circle over (3)}, {circle over (4)}, {circle over (5)} are composed of “H” level and “L” level of 1 bit = T seconds. Here, in order to express “0” of binary data, the case where there is no level change at “H” level or “L” level during T seconds = 1 bit, data bit “0”, ▲ 3), and the case where the “H” level and the “L” level are included in T seconds and the level is changed is regarded as “1” data bits (4) and (5).
[0006]
Here, “1” is normally set to “H” = T / 2 seconds and “L” = T / 2 seconds, and the CPUs 53 and 63 detect the “H” level or “L” level of T / 2 seconds. Therefore, level detection is performed at a timing of every T / 4 seconds.
That is, the data bit {circle over (2)} is composed only of the “L” level, and the data bit {circle over (3)} is composed only of the “H” level. The data bits {circle around (4)} and {circle around (5)} can be judged as “1” because they are composed of “H” level and “L” level.
[0007]
[Problems to be solved by the invention]
In such an intercom data identification method, since the cycle is set to “H” level = T / 2 seconds and “L” level = T / 2 seconds to constitute “1”, the data transmission circuit and the data Depending on the circuit configuration of the receiving circuit, the T seconds of “L” level and “H” level may not be accurately output due to electrical variation, and the cycle T seconds ((6) in FIG. 4B) may be lengthened. It can be shortened.
[0008]
Here, when “H” level data is normally transmitted from the master unit to the slave unit, it becomes as indicated by P ₁ in FIG. 4 (b). Afford. However, when (6) (that is, period T seconds) is not sufficiently secured due to electrical factors as indicated by P ₂ , there is only a margin of (8). If this is an extreme case, as shown in P ₃ , there is a possibility that the data “0” may be recognized as “1” unless the margin (7) is secured.
[0009]
The present invention has been made to solve such a problem, and measures the length of “H” level and “L” level of continuous “0” and continuous “1”, and has a period of T seconds. It is an object of the present invention to provide an intercom data identification method capable of accurately identifying output actual data based on measured actual values.
[0010]
[Means for Solving the Problems]
In order to achieve this object, the intercom data identification method according to the present invention is such that a plurality of slave units are connected to a master unit by a common line, and there is no level change between 1 bit and “H” level or “L” level. The case is identified as “0” of the binary data, and when the “H” level and the “L” level are included between 1 bit and there is a level change, it is identified as “1” of the binary data and the master unit and the child When sending and receiving actual data between the machines, the master unit and slave units that have transmitted the binary test data to the other side of the master unit and slave units, respectively, are sent to the other side. The other side of the machine measures the length of “H” level and “L” level of continuous “0” and continuous “1” respectively , stores the measurement time in the storage memory, and based on the measured actual value Identify Than it is.
[0011]
In this way, the length of “H” level and “L” level of continuous “0” and continuous “1” is measured, and the actual data output in the period T seconds is accurately based on the measured actual value. Can be identified.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an interphone data identification method according to the present invention will be described in detail with reference to the drawings showing a preferred embodiment thereof.
In the interphone apparatus as shown in FIG. 1, a master unit M and a plurality of slave units S ₁ , S ₂ ..., S ₈ are bus-connected by common lines L ₁ and L ₂ (here, eight slave units are provided). Assuming it is connected).
[0013]
The actual data transmitting circuit 4 and the actual data receiving circuit 5 for transmitting / receiving actual data to / from the plurality of slave units S ₁ , S ₂ ... S ₈ are connected to the CPU 3 of the master unit M. A storage memory (RAM) 1 for storing the measurement time and a storage circuit (ROM) 2 for storing the processing procedure and the actual data transmission time are also connected. Similarly, in the CPU 13 of the child device S ₁ , a real data transmission circuit 14 for transmitting / receiving actual data to the parent device M and an actual data receiving circuit 15 are connected, and a storage memory for storing the measurement time of actual data ( (RAM) 11 and a storage circuit (ROM) 12 for storing processing procedures and actual data transmission time are also connected.
[0014]
In the master unit M and the slave unit S ₁ , the actual data transmitting circuit 4 is connected to the actual data receiving circuit 15 via the common line L ₁ , and the actual data transmitting circuit 14 is connected to the actual data receiving circuit 5 via the common line L _2. It is connected to the.
In the above description it has been described the configuration of the slave unit S _1, has the same configuration in the other handset. Therefore, the other of the slave unit S _2, S ₃ ..., a description of the S ₈ omitted.
[0015]
The intercom identification method in the intercom apparatus configured as described above identifies a case where there is no level change between 1 bit and “H” level or “L” level as “0” of binary data, and between 1 bit. in "H" level and "L" of the binary data if the level is contains level change "1" and identified and the master unit M, handset S _1, S ₂ ..., the actual data between S ₈ Send and receive.
[0016]
Here, when the binary test data of continuous “0” and continuous “1” is transmitted from the master unit M to the slave units S ₁ , S ₂ ... S ₈ , the slave unit S ₁ that has received the binary test data. S ₂ ..., S ₈ measure the lengths of “H” level and “L” level of consecutive “0” and “1”, respectively, and identify actual data based on the measured actual value. Similarly, when the slave unit S ₁ , S _2, ..., S ₈ transmits continuous “0” and continuous “1” binary test data to the base unit M, the base unit that has received the binary test data similarly. M measures the length of “H” level and “L” level of continuous “0” and continuous “1”, respectively, and identifies actual data based on the measured actual value.
[0017]
In the intercom apparatus used in the intercom data identification method according to the present invention, after the system reset is completed, the data length setting program operates as follows.
FIG. 2 shows a processing procedure of a data length setting program (DMP) in the base unit M. In this case, it is determined whether or not the power of the parent device M is turned on (determination box F ₁ ), and if it is turned on, the reset of the parent device M is released (processing F ₂ ).
[0018]
The master unit M slave unit S _1, S ₂ ..., as binary test data to S _8, "0" to 256 times, and "1" to 256 forward out (process F _3), with respect to slave unit number n A command for sending “0” 256 times is sent (process F ₄ ).
The base unit M measures the “L” level time of “0” from the handset number n, stores the “L” level time in the address 1 which is a specific address of the RAM 1 connected to the CPU 3, and also stores “0”. When measuring the “H” level time of “H”, the “H” level time is stored in the address 2 which is a specific address of the RAM 1 connected to the CPU 3 (processing F ₅ ). It is determined whether or not the transmission from the child device S _n is completed (decision box F ₆ ), and if it is completed, a command for transmitting “1” 256 times to the child device number n is transmitted (processing F ₇ ). .
[0019]
The “L” level time of “1” from the slave unit number n is measured, the “L” level time is stored in the address 3 which is a specific address of the RAM 1 connected to the CPU 3, and the “H” of “1”. When measuring the level time, the “H” level time is stored at address 4 which is a specific address of the RAM 1 connected to the CPU 3 (processing F ₈ ). It is determined whether or not the transmission from the child device S ₁ is completed (decision box F ₉ ). If it is completed, it is determined whether or not the measurement of the level time of the child devices 1 to 8 is completed ( Judgment box F ₁₀ ), if completed, the process proceeds to normal processing.
[0020]
FIG. 3 shows the processing procedure of the data length setting program (PWP) in the slave unit. In this case, when the reset of the slave unit is released (processing F ₂₁ ), the “L” level time of “0” from the master unit M is measured, and the “L” level time is specified in the RAM 11 connected to the CPU 13. It is stored at address 1 which is the address. Similarly, when measuring the “H” level time of “0”, the “H” level time is set to the address 2 of the RAM 11, and when measuring the “L” level time of “1”, the “L” level time is measured. Is measured at the address 3 of the RAM 11 and the “H” level time of “1” is memorized at a specific address of the RAM 11 connected to the CPU 13 such as the address 4 of the RAM 11 ( processing F _22).
[0021]
It is determined whether or not a transmission command of “0” has been received from the parent device M (determination box F23 ), and if received, “0” is transmitted 256 times to the parent device M (processing F24).
It is determined whether or not a transmission command of “1” is received from the parent device M (determination box F25 ). If received, “1” is transmitted 256 times to the parent device M (processing F26), and normal processing is performed. Migrate to
[0022]
Thereafter, the normal operation is started. At the time of “H” and “L”, the level detection timing is determined by using the values and correction values stored in the storage memory (RAM).
In the above embodiment, the number of slave units connected to the interphone apparatus is eight. However, the number of slave units is not limited to eight in implementing the interphone data identification method according to the present invention.
[0023]
【The invention's effect】
As is clear from the above description, according to the intercom data identification method according to the present invention, it is possible to always determine an ideal reading time by adjusting the data cycle to the measured value of the data unit length, and to secure a reading allowance time. It is possible to accurately identify the data.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of an intercom apparatus using an interphone data identification method according to the present invention.
FIG. 2 is a flowchart in the base unit of the intercom data identification method according to the present invention.
FIG. 3 is a flowchart of the intercom data identification method according to the present invention in the slave unit.
FIG. 4A is a control pattern diagram of the intercom data identification method, and FIG. 4B is a cycle diagram of data bits of the interphone data identification method.
FIG. 5 is a block diagram showing an embodiment of an intercom apparatus using a conventional intercom data identification method.
[Explanation of symbols]
M ... Master units S1, S2, S8 ... Slave units L1, L2 ... Common line
1, 11 ... Memory

Claims (1)

A plurality of slave units (S1, S2,..., S8) are connected to the master unit (M) by a common line (L1, L2), and the level changes between 1 bit and “H” level or “L” level. When there is no data, it is identified as “0” of binary data, and when there is a level change including “H” level and “L” level between 1 bit, it is identified as “1” of binary data and the master unit In transmitting and receiving actual data between the slave units, continuous binary test data of “0” and continuous “1” are transmitted from one of the master unit and the slave unit to the other, respectively, The other of the received master unit and the slave unit measures the lengths of the “H” level and “L” level of the continuous “0” and the continuous “1”, respectively, and stores the measurement time in the storage memory (1, based on the actual value stored measured 11) Intercom data identification method characterized by identifying the actual data.

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