JPH05158827A - Device and method for retrieving received command - Google Patents

Abstract

PURPOSE:To provide a received command retrieving device and a retrieval method for the same capable of retrieving efficiently a received command. CONSTITUTION:The command constituted of characters consisting of bit strings is received, and the corresponding command is retrieved from among the received commands. In this received command retrieving device, a receiving means 8 to fetch the received command and a collation information generating means 22 to generate collation information from the bit strings of the characters to express the received command are provided. Besides, a storage means 81 to store the table of all the commands classified into a command group for every collation information and a first retrieving means 8 to retrieve the collation information of the storage means from the generated collation information are provided. Further, a second retrieving means 8 to retrieve the same command as the received command from among the command group belonging to the collation information retrieved by the first retrieving means is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a search device and a search method for searching a command transmitted by a higher order communication device in a lower order communication device in a communication system for transmitting and receiving a unique command composed of a character consisting of bit strings. It is a thing.

[0002]

2. Description of the Related Art When searching for a command transmitted in a conventional communication system, a command stored in a reception buffer is received by a search method for comparing and collating each command with all commands stored in the receiving side. I was trying to confirm the command I did.

[0003]

In the conventional command retrieval method in the communication system, each character is compared and collated with each character regardless of whether the received command is normal, abnormal, valid or invalid. There is a problem in that time is spent for processing, the efficiency of the communication system is reduced, and the processing load of the control system on the receiving side increases.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a received command search device and method capable of efficiently searching a received command.

[0005]

In order to achieve the above object, the present invention provides a received command search device for receiving a command composed of a character consisting of a bit string and searching for the corresponding command from the received command. Receiving means for fetching the received command, collation information generating means for generating collation information from a bit string of a character representing the received command, and storage means for storing a table in which all commands are divided into command groups for each collation information, A first search unit that searches the collation information in the storage unit from the generated collation information and a command group that belongs to the collation information that is searched by the first search unit for the same command as the received command. The second search means is provided (Claim 1).

Further, the collation information generating means is a circuit for sequentially performing an exclusive OR for each character of the received command (claim 2).

Further, in a received command search method for receiving a command composed of a character consisting of a bit string and searching for a corresponding command from the received command,
Collation information is generated from a bit string of a character representing a received command, and all the commands are divided into command groups for each collation information and stored, and first, the generated collation information is searched,
Next, the received command is retrieved from the command group belonging to the collation information (claim 3).

[0008]

According to the present invention, the collation information is generated from the received command by the collation information generating means. First, the first search means searches the table stored in the storage means for the matching information, and then the second search means searches the command group belonging to the matching information for the same command as the received command.

Further, according to the second aspect of the invention, in the collation information generating means, the exclusive OR is sequentially applied to each character of the received command, and the calculated value of the exclusive OR is used as the collation information. To be done.

According to the third aspect of the present invention, the collation information is generated from the bit string of the character representing the received command, and all the commands are divided into command groups for each of the collation information and stored first. The matching information is searched, and then the received command is searched from the command group belonging to the matching information.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 6 is a schematic configuration diagram showing an environment test system having a lower communication device to which the present invention is applied. The computer 1 is for instructing the operation of the environmental tester 2 and is connected to each other via a communication cable 3 so that operation commands and the like can be transmitted and received. In this embodiment, the communication is serial transmission, and the transmission data is formed by adopting the ASCII code which represents each character by 7 bits.

FIG. 2 is a block diagram showing an environment test system in this embodiment, and FIG. 1 is a block diagram showing a configuration of a receiving section 91 of a lower communication apparatus 9 to which the present invention is applied.
The computer 1 includes an input / output interface 4, a processing device 5, and a host communication device 6.

The input / output interface 4 is an environmental tester 2.
The power supply control and various conditions such as temperature and humidity are set, and the set and received data such as temperature and humidity on the environmental tester 2 side are displayed. Processor 5
Is an internal processing of the computer and is composed of a CPU and the like, receives data from the input / output interface 4 and the higher order communication device 6 and performs processing, and sends display data and communication data to each. The host communication device 6 includes a transmitter 61 that transmits a command or the like to the environmental tester 2 based on an instruction from the processor 5, and a receiver 6 that receives data from the environmental tester 2 and sends the data to the processor 5.
2 and.

Further, the environment tester 2 includes an input / output interface 7, a processing device 8, a lower communication device 9, a control unit 10, a sensor 11, a heater 12 and a refrigerator 13.

The input / output interface 7 is the environmental tester 2.
The operation setting and the like are performed, and data such as temperature and humidity of the environmental tester 2 are displayed based on an instruction from the processing device 8.

The processing device 8 performs internal processing of the environmental tester 2 and is composed of a CPU or the like. The processing device 8 receives data from the input / output interface 7 and the lower communication device 9 for processing, and displays the processed data. It sends data and communication data. Further, the processing device 8 includes the control unit 10
The operation control of the heater 12 and the refrigerator 13 is performed based on the data from the sensor 11 for detecting the state of the test tank of the environmental tester 2 and the command from the computer 1 via the. Further, the processing device 8 has a storage unit 81 therein which stores a command table and the like described later.

The lower-level communication device 9 receives the command data from the computer 1 and sends it to the processing device 8 by a receiving unit 91.
And a transmission unit 92 for transmitting data such as temperature and humidity of the test tank of the environmental tester 2 to the computer 1 based on an instruction from the processing device 8. In addition, the receiving unit 91
Is a receiving circuit unit 21 and a receiving character number counting unit 2
3 and a collation code generation unit 22 having a logical operation unit 24.

The receiving circuit section 21 receives the command data sent from the computer 1 and sends the character data to the processing device 8. The collation code generation unit 22 creates a collation code when the processing device 8 searches for a command sent from the computer 1. In the present embodiment, two types of verification codes are used: the number of command characters and the value of the exclusive OR (EX-OR) performed between command characters. The reception character number counting unit 23 counts the number of characters of the received command and outputs the result to the processing device 8
Is to be sent to. The logical operation unit 24 includes, for example, a buffer therein, sequentially performs an exclusive OR operation on each character of the received command, and sends the result to the processing device 8. Even if only the final operation result is sent. Okay
The calculated exclusive OR value is sequentially transmitted to the processing device 8,
The processing device 8 may employ the value transmitted the number of characters as the calculation result.

It should be noted that all commands used in this environment test system have been subjected to exclusive OR calculation in advance by the above-mentioned procedure, and each command has been classified according to the number of characters and the exclusive OR calculation result. The command table is stored in the storage unit 81 of the processing device 8. Table 1 shows the command table stored in this embodiment.

[0020]

[Table 1]

Each command is first classified by the number of characters. In this embodiment, the number of command characters is 4.
.About.7, they are classified into 4 groups. Then, in each character number group, the characters are further classified by the value of the exclusive OR performed for each character of the command.

Next, the operation of the exclusive OR in the logical operation unit 24 will be described by taking the command "RESET" as an example. FIG. 3 is a diagram showing an exclusive OR calculation procedure. First, the exclusive OR of zero (000 0000) and the first received character R (101 0010) is calculated, and (101 001
0) is obtained. Next, the exclusive OR of the calculation result and the character E (100 0101) received next is calculated. In this way, the result of the exclusive OR calculation and the next received character are sequentially obtained with the exclusive OR, and the collation code (here, 101 0101) is finally obtained. Therefore, the number of characters is 5 and the EX-OR value (101 01
From 01), 'RESET' shown in Table 1 is adapted.

Next, the operation of the environmental tester 2 configured as described above will be described. FIG. 4 is a flowchart showing the operation of the environment tester 2. When the power of the environmental tester 2 is turned on, first the CPU is initialized (step S
1) Next, control of the input / output interface 7 such as search for presence or absence of operation input and display output is performed (step S2),
Internal data processing is performed (step S3). Then, the data obtained based on the above data processing is transmitted / received (step S4), the received command is searched from the storage unit 81 (step S5), and the processing items are determined (step S6). Etc. perform communication processing. Then, the state of the test tank such as temperature and humidity is measured (step S7), the control signal is output (step S8), the test tank is controlled, and the process returns to step S2.

Next, the procedure of command retrieval in step S5 will be described with reference to the flowchart of FIG. First, the number of characters is determined (step S11),
The number of characters set in advance (in the present embodiment, Table 1 above)
If the number of characters is normal, the collation position is set to the head of the corresponding group according to the number of characters (step S).
12). Next, it is determined whether or not the value of the exclusive OR calculated by the logical operation unit 24 is included in the character number group (step S13). If there is a corresponding one, the collation position is set to the head of the corresponding exclusive OR operation value group (step S14). For example, when the number of characters is 4 and the EX-OR value is 001 0100, “MASK” is set first.

Then, the character of the received command taken into the processor 8 is compared with the character of the command table (step S15). If the first character does not match (NO in step S16), step S16.
19. If they match (YES in step S16)
S), the collation position is advanced by one character (step S1
7) Then, it is determined whether or not the characters for collation have ended (step S18), and if the end, the corresponding command has been confirmed, so the present search processing ends, while if not ended, to step S15. Go back and compare to the next character.

On the other hand, if the compared characters do not match in step S16, the collation position is moved to the next command position (step S19). For example, in the above example where the number of characters is 4 and the EX-OR value is 001 0100,
Moved from'MASK 'to'DATE'. And
It is determined whether or not the command in this group is completed (step S20), and if it is not completed, the process returns to step S15 and the characters are compared again. On the other hand, if it is completed, it is determined that the corresponding command cannot be retrieved. , This search processing ends.

The collation code may be generated using a circuit configuration other than exclusive OR. Further, in the present embodiment, the number of characters, the exclusive OR, and the two collation codes are used, but either one may be used, or another collation code may be used.

[0028]

As described above, according to the present invention, a receiving command retrieval device for receiving a command composed of a character consisting of a bit string and retrieving the corresponding command from the received command, and receiving means for receiving the received command Collation information generating means for generating collation information from a bit string of a character representing the received command, storage means for storing a table in which all commands are divided into command groups for each collation information, and storage means from the generated collation information And a second searching means for searching the same command as the received command from the command group belonging to the matching information searched by the first searching means. Therefore, the number of targets to search for command signals can be reduced, which increases the processing load of software required for communication. It can be reduced. Further, the load of the control software can be reduced when the search command is applied to a predetermined control operation, for example, when it is applied to an environment tester or the like.

Further, the collation information can be constructed by hardware by constructing the collation information generation means by a circuit for sequentially performing an exclusive OR for each character of the received command, so that the processing load of software is increased. Does not increase.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a receiving unit of a lower communication apparatus to which the present invention is applied.

FIG. 2 is a block diagram showing an environment test system in the present embodiment.

FIG. 3 is a diagram showing an exclusive OR calculation procedure.

FIG. 4 is a flowchart showing the operation of the environmental tester.

FIG. 5 is a flowchart showing a procedure for command search.

FIG. 6 is a schematic configuration diagram showing an environment test system having a lower communication device to which the present invention is applied.

[Explanation of symbols]

 1 Computer 2 Environment Tester 3 Communication Cable 4, 7 Input / Output Interface 5, 8 Processing Device 6 Upper Communication Device 9 Lower Communication Device 10 Control Unit 11 Sensor 12 Heater 13 Refrigerator 21 Reception Circuit Unit 22 Matching Code Generation Unit 23 Received Character Number counting unit 24 Logical operation unit 61,92 Transmitting unit 62,91 Receiving unit 81 Storage unit

Claims (3)

[Claims] 1. A reception command retrieval device for receiving a command composed of a character consisting of a bit string and retrieving the corresponding command from the reception command, and receiving means for taking in the reception command and a character representing the reception command. First, collation information generating means for generating collation information from a bit string, storage means for storing a table in which all commands are divided into command groups for each of the collation information, and retrieval information for collation information in the storage means from the generated collation information. And a second search means for searching the same command as the received command from the command group belonging to the collation information searched by the first search means. Search device. 2. The received command retrieving apparatus according to claim 1, wherein the collation information generating means is a circuit for sequentially performing an exclusive OR for each character of the received command. 3. A received command search method for receiving a command composed of a character consisting of a bit string and searching for a corresponding command from the received command, wherein collation information is generated from a bit string of a character representing the received command, and all commands are generated. In which the received command is searched for in the command group that belongs to the collation information, and then the received command is searched in the command group that belongs to the collation information. Command search method.