JPH06326747A - Communication controller - Google Patents

Abstract

PURPOSE:To utilize a content of a reception frame even when the processing of a master processor is limited timewise. CONSTITUTION:A communication list received from a master processor is stored and a pointer to the communication list is managed. A communication unit selection means sends a pointer pointing out a head of the communication list to a communication unit read means and part of the communication list corresponding to the pointer is sequentially sent to an external device. In the case of the transmission/reception of the communication list, at first a transmission frame of a communication unit at the head of the communication list is read and sent. When a frame corresponding to the transmission frame is received, a reception frame interpreting means executes an interpretation procedure designated by the communication unit, the content of the received frame is interpreted and the result is given to the master processor. A selection means selects the communication unit to be sent from among the communication units pointed out by a pointer table and the similar transmission reception processing is executed as to the selected communication unit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication control device suitable for making communication processing of a computer system efficient.

[0002]

2. Description of the Related Art As a conventionally known communication control device, as described in Japanese Patent Application Laid-Open No. 2-182062, a communication processor receives a plurality of transmission frames from a main processor in one transmission request, There is a system in which frames are added to a queue and the frames at the head of the queue are sequentially transmitted to an external device. The main processor performs a necessary processing operation based on the information from the external device received by the communication control device.

[0003]

However, in the prior art, in order for the main processor to immediately perform the necessary processing operation based on the content of the received frame received from the external device, the main processor waits for the end of reception. After that, it was necessary to receive the received frame from the communication processor. When the content of the received frame from the external device does not satisfy the predetermined condition, the main processor needs to send the transmitted frame to the external device many times,
The burden of communication processing of the main processor was heavy. Therefore, when the processing of the main processor is time-limited, there is a drawback that the main processor does not have enough time to wait for the reception completion and the above-mentioned communication processing cannot be performed. As an example of such a case, the main processor may sequentially perform a processing operation on a plurality of external devices by polling at regular intervals, or may start the processing operation by an interrupt from the outside. Therefore, an object of the present invention is to reduce the load for communication processing of the main processor and to immediately perform necessary processing operation based on the content of the received frame even when the processing of the main processor is time-limited. It is to provide a communication control device that is capable of performing.

[0004]

In order to achieve the above object, the communication control device of the present invention according to claim 1 interprets the interpretation information and the reception information for interpreting the transmission information and the reception information. A communication list storage means for storing a communication list in which an arbitrary communication unit is linked by designating a communication unit to be transmitted next by the pointer table of the communication unit. A selection control means for selecting and reading a communication unit to be transmitted from the communication list stored in the communication list storage means; and a transmission for transmitting the transmission information of the communication unit selected by the selection control means to an external device. Means, a receiving means for receiving information transmitted from an external device, and the receiving means based on the interpretation information of the communication unit selected by the selection control means. And a reception information interpreting means for interpreting the received information, wherein the selection control means selects a communication unit at the head of the communication list in response to a transmission start instruction, and causes the transmission information to be transmitted by the transmission means. Each time the receiving means receives information from the device, the received information interpreting means responds from the pointer table of the selected communication unit according to the result of interpreting the received information based on the interpretation information of the selected communication unit. The pointer is selected and checked, and the transmission information of the communication unit designated by the pointer is transmitted.

According to another aspect of the present invention, in the invention described in claim 1, the following configuration is provided. That is, in the invention described in claim 2,
It is composed of a communication unit having interpretation information for interpreting the transmission information and reception information and a pointer table provided corresponding to the result of interpreting the reception information, and the communication unit to be transmitted next is designated by the pointer table of the communication unit. By so doing, there is provided an input means for inputting a communication list in which an arbitrary number of communication units are linked, and the communication list storage means is configured to store the communication list input by the input means.

According to another aspect of the invention, there is provided an input means for inputting information designating a communication list stored in advance in the communication list storage means, and the selection control means receives the input in response to a transmission start instruction. The communication unit at the head of the communication list designated by the means is selected.

Still another invention is defined by the above-mentioned claims 1 to 3.
The invention described in (3) is characterized by having the following configuration. That is, in the invention described in claim 4, the communication list storage means is provided with a communication list connection means for connecting a plurality of communication lists in the transmission order, and the selection means, each time the reception means receives information from an external device, The reception information interpreting means interprets the reception information based on the interpretation information of the selected communication unit, checks the pointer corresponding to the interpretation result from the pointer table of the selected communication unit, and is instructed by the pointer. When there is a communication unit, the communication unit is selected, and when there is no communication unit pointed to by the pointer, the first communication unit of the communication list to be transmitted next is selected and the reception information is transmitted. is there.

In the invention described in claim 5, the order information storage means for storing the order information transmitted by the plurality of communication lists of the communication list storage means and the communication unit corresponding to the reception information received by the reception means are determined. The selection control means sequentially selects the first communication unit of each communication list based on the order information and causes each transmission information to be transmitted by the transmission means, and the reception unit from the external device. Each time the means receives the information, the transmission information of the communication unit designated by the pointer corresponding to the interpretation result by the interpretation information of the communication unit discriminated by the reception discriminating means is transmitted.

According to the invention described in claim 6, in the invention described in claim 1, there is provided output means for outputting the interpretation result, and the interpretation information indicates the interpretation method of the reception information and the interpretation result. There is a condition to be output, and the reception information interpretation means is configured to output the interpretation result by the output means when the result of interpreting the reception information satisfies the condition to be output.

[0010]

According to the invention described in claim 1, the selection control means selects the communication unit at the head of the communication list in response to the transmission start instruction, transmits the transmission information, and receives the information from the external device. Each time the reception information interpreting means interprets the reception information based on the interpretation information of the selected communication unit, the corresponding pointer is selected and examined from the pointer table of the selected communication unit, and the pointer is instructed. The transmission information of the communication unit is transmitted. Further, according to the invention described in claim 2, since the means for inputting the communication list is provided and the necessary communication list is appropriately input from the main processor, communication with an arbitrary external device can be performed, and
The capacity of the communication list storage means can be reduced.

According to the invention described in claim 3,
Since the communication list stored in advance in the communication list storage means is designated, the transmission instruction from the main processor becomes simple and the load on the main processor can be reduced. According to the invention described in claim 4, since the plurality of communication lists are combined in the order of transmission, it is possible to continuously transmit the next communication list after the transmission of one communication list is completed. Therefore, it is possible to sequentially perform transmission to a plurality of external devices, and it becomes unnecessary for the main processor to instruct transmission of a new communication list each time each communication list ends, and the load on the main processor can be reduced.

According to the invention described in claim 5,
The communication units of each communication list can be transmitted in the order of transmission of the communication list, and the transmission of the communication unit corresponding to the received information from the external device is determined and interpreted. Can be done in parallel. Further, according to the invention described in claim 6, since the interpretation result is output only when the interpretation result satisfies a predetermined condition, it is possible to obtain only the result required by the main processor side. The communication load on the main processor can be reduced.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the concept of a communication unit used in the communication control device of the present invention. The communication unit is a set of information required for one transmission / reception. Then, the information required for communication is passed from the main processor to the communication device in the form of a communication list including a plurality of communication units linked to each other by a pointer.

In FIG. 1, a communication unit is composed of a transmission frame, interpretation information indicating interpretation means of a frame received corresponding to the transmission frame (for example, information such as a pointer storing a program to be interpreted and an ID number) and the following. It has a table of pointers to communication units that may be sent to. However, the pointer table consists of 0 or 1 or more pointers.

An example of the communication list is shown in FIG. Figure 2 (a)
Indicates that transmission / reception is performed only once, (b) indicates that transmission / reception is repeated until a certain condition is satisfied as a result of interpretation of the reception frame, and (c) indicates a transmission command selected according to the content of the reception frame by the first transmission / reception. What to do,
(D) is for sequentially transmitting a large number of commands, and (e) is for forming a complicated control structure. In this way, by linking communication units with pointers, commands /
It becomes possible to construct a control structure between a plurality of transmissions / receptions in status communication and the like. Also, when the transmission frame of each communication unit is composed of a plurality of frames, a large number of commands can be transmitted at one time.

Next, the outline of the communication control device of the present invention will be described with reference to FIG. The communication control device includes a communication list storage unit that receives and stores a communication list from the main processor, a communication list management unit that manages the received communication list, and a received content interpretation procedure storage that stores a plurality of procedures for interpreting a received frame. Means, a communication unit selecting means for selecting a communication unit to be processed next, a transmission frame, a pointer indicating a reception frame interpretation procedure as information contained in the selected communication unit, and a communication unit which may perform transmission / reception next Communication list storage means for storing a table of pointers, communication unit read means for reading communication units from the communication list storage means and received content interpretation procedure storage means, frame transmission means for transmitting a frame to an external device, external as an external device Frame receiving means for receiving a frame from a device,
It is provided with a received content interpretation means for executing a procedure designated by the communication unit to interpret the received frame, and an interpretation result transmission means for transmitting the interpretation result to the main processor according to the interpretation result.

According to the structure of the above means, the communication list passed from the main processor is sequentially stored in the communication list storage means in order to respond to the transmission request at any time, and the pointer for accessing the communication list is stored. Is managed by the communication list management means. Then, the communication unit selecting means selects the communication list to be transmitted from the pointer pointing to the head of the communication list to be transmitted from the communication list managing means, and sends the pointer pointing to the head communication unit to the communication unit reading means. The communication unit reading means sequentially transmits and receives to and from the external device based on each communication unit of the selected communication list, and repeats this operation for each communication list managed by the communication list managing means.

When performing transmission / reception based on each communication unit of the communication list, first, a transmission frame of the communication unit at the head of the communication list is read from the communication list storage means and transmitted in response to an instruction to start transmission of the communication list. . On the other hand, when the frame corresponding to this transmission frame is received, the interpretation procedure specified by the communication unit is read from the reception frame interpretation procedure storage means, and the received frame interpretation means executes the procedure to read the contents of the reception frame. When the result is interpreted and the predetermined condition is satisfied, the interpretation result is transmitted to the main processor through the interpretation result transmission means. As the interpretation result transmission means, there are a method of transmitting the interpretation result by changing a flag that the main processor can read and a method of sending a signal such as an interrupt to the main processor.

Then, the communication unit selection means selects one pointer from the pointer table of the communication unit based on the interpretation result, and performs similar transmission / reception processing for the communication unit designated by the selected pointer. When the pointer does not point to the communication unit to be transmitted next, the communication of the communication list is ended, and an instruction to start transmission is issued for the next communication list.

(First Embodiment) FIG. 4 shows a hardware configuration in which a communication control device is incorporated in the first embodiment. In this embodiment, the main processor 100 can access the main processor memory 101 and the shared memory 106. Further, the communication processor 102 of the communication control device can access the communication processor memory 103, the shared memory 106, and the registers inside the communication controller 104. When the main processor 100 and the communication processor 102 try to access the shared memory 106 at the same time, the shared memory controller 105 makes an adjustment to ensure access to both.

Next, the software process and the data area will be described with reference to FIG. First, on the processor 100, the process 1 requesting the communication processor 102 to communicate.
15-1 to n are executed. Here, the code and data of the communication request process are stored in the main processor memory 101. In addition, each communication request process has information about which procedure in a received content interpretation procedure storage area 124, which will be described later, processes which received frame, and the transmission frame and the received content interpretation procedure are correctly combined. You can On the communication processor 102,
The communication control process 110, the transmission process 111, the reception process 112, the reception content interpretation process 113, and the queue control process 114 are executed. Codes and data of these processes are stored in the communication processor memory 103.

In the shared memory 106, the queue 12
0, a communication list storage area 121, a pointer 122 to a communication unit in which communication is currently performed, and an external flag area 123 for transmitting the interpretation result of the received frame to the main processor 100. An area 124 for storing a procedure for interpreting a received frame exists in the communication processor memory 103. However, this area 124 may be in the shared memory 106.

In this embodiment, the communication unit is realized as shown in FIG. The communication unit 150 is the transmission frame 1
51, a pointer 152 that points to the reception content interpretation procedure in the storage area 124, and a pointer table 153 that points to a communication unit in which communication may be performed next. Further, the transmission frame 151 is the transmission character string 15
5 and a frame length 156. Each communication unit 15
A communication list is composed of a plurality of communication units in which 0 is linked by the pointer of the table 153. Further, this communication list may be composed of only one communication unit.

The operation of the first embodiment will be described. Any process 115-i of the processes 115-1 to 11-n on the main processor 100 is a communication processor 10.
When requesting communication with the external device 107 from No. 2, the communication list is passed to the communication processor 102 as follows. That is, first, the communication request process 115-i generates a communication list used for communication and stores it in the communication list storage area 112. At this time, if the contents of the communication list already exist in the communication list storage area 112, that communication list may be selected. Then, the communication list storage area 112 adds a pointer for accessing the communication list to the queue 111.

On the other hand, the communication processor 102 uses the queue 1
Communication is performed in order from the first communication list of 11. Less than,
The processing content will be described with reference to the flowchart of FIG. The numbers in parentheses represent the numbers of each block (step) in the flowchart of FIG. 7. Queue control process 11
4 waits until the pointer enters the queue 120 (20
1). When the pointer enters the queue 120, the queue control process 114 first copies the top element of the queue 120 to the pointer 122 as a communication unit in communication processing (202). The communication control process 110 has a pointer 122
A transmission frame 151 of a communication unit pointed to by, a pointer 152 to a received content interpretation procedure, and a pointer table 153 to another communication unit are obtained from the communication list storage area 121 and the received content interpretation procedure storage area 124 (203).

The transmission process 111 receives the transmission frame 151 obtained in step 203 from the communication control process 110 and transmits it to the external device 107 (204). The reception content interpretation process 113 stores the pointer 152 to the reception content interpretation procedure and the pointer table 153 to another communication unit obtained in step 203, in the communication control process 110.
(205).

The reception process 112 receives the reception frame corresponding to the transmission performed in step 204 from the external device 107 and transfers it to the reception content interpretation process 113 (20
6). The received content interpretation process 113 interprets the content of the received frame by executing the received content interpretation procedure received in step 205 (207). The received content interpretation process 113 changes an appropriate flag in the external flag area 123 according to the interpretation result of step 207 (208). Received content interpretation process 113
Selects the pointer indicating the communication unit to be processed next from the pointer table 153 received in step 205 based on the interpretation result of 207 (209).

If the selected pointer indicates the communication unit to be transmitted next, the pointer linked to the communication unit is selected from the pointer table 153, and the process goes to step 211. On the other hand, if the selected pointer is a pointer (null pointer) that is not connected to anything, step 212
Go to (210). When the communication unit to send is indicated, the queue control process 114 copies the selected pointer to the pointer 122. Then, the processing from step 203 is performed on the communication unit pointed to by the pointer (211).

If the selected pointer is the null pointer, the queue control process 114 determines that the transmission of the communication list is completed, and the external flag area 123 is determined.
The flag is changed, the head element of the queue 120 is discarded, the next element is copied to the pointer 122, and the processing from step 203 onward is performed for the communication unit pointed to by the pointer (212). This is repeated until there are no pointers in the queue 120.

In this embodiment, the interpretation method is specified for each communication unit, and the flag is changed when the interpretation result satisfies the specified condition. Therefore, the flag is changed for each communication unit. Can be done. Therefore, the process of processing the communication list can be notified by a flag as needed. Further, this flag change may be performed only when the processing of the communication list is completed.

(Second Embodiment) FIG. 8 shows the hardware configuration of the second embodiment of the present invention. In the present embodiment, the parts represented as the main processor and the communication device in FIG. 3 are realized as a main process group 310 and a communication process group 311 each including one or more processes executed on the CPU 300. However, other processes may exist. In addition, this embodiment includes a CPU 300 that executes a plurality of processes in parallel, a memory 301 that stores data and a work area of each process, and a communication controller 104 that performs frame communication with an external device 107. These components are connected by an internal bus. However, other components may be present.

FIG. 9 shows the software process and data area of the second embodiment. First, the CPU 300 executes the main process group 310 and the communication process group 311. The main process group 310 includes a communication request process 115-
1-115-n are included. Also, the communication process group 31
1, a communication control process 110, a transmission process 111,
A reception process 112, a reception content interpretation process 113, and a queue control process 114 are included.

The memory 301 includes a main process group memory area 320, a communication process group memory area 321, and a shared memory area 322 accessible from both the main process group 310 and the communication process group 311. In the shared memory area 322, a queue 120 for managing the communication list, an area 121 for storing the communication list, an area 124 for storing the received content interpretation procedure, a pointer 122 pointing to a communication unit currently performing communication, a main process External flag area 123 that conveys the interpretation result of the received frame to the group 310
Is included. Here, the configuration of the communication unit and the communication list is similar to that of the first embodiment.

Next, the operation of the second embodiment will be described. A process in the main process group 310 is an external device 10
When it is necessary to communicate with the communication list 7, the process generates a communication list used for communication, and the communication list storage area 121
Write in. At this time, if the contents of the communication list already exist in the communication list storage area 121, that communication list may be selected. Then, a pointer to the communication list is added to the queue 120. on the other hand,
The communication process group 311 performs communication in order from the communication list at the head of the queue 120. The communication process is performed according to the flowchart shown in FIG. The processing contents will be described below with reference to the flowchart of FIG. The numbers in parentheses represent the numbers of the blocks (steps) in the flowchart.

The communication process group 311 waits until a pointer enters the queue 120 (401). When the pointer is entered, the queue control process 114 sets the pointer 122 to the head element of the queue 120 as the communication unit in the communication process.
(402). The communication control process 110
A transmission frame 151 of the communication unit pointed to by the pointer 120,
The communication list storage area 1 includes a pointer 152 that points to a reception content processing procedure and a pointer table 153 that points to another communication unit.
21, read from the received content interpretation procedure storage area 124 (403). The transmission process 111 uses the transmission frame 15
1 is received from the communication control process 110 and transmitted to the external device 107 through the communication controller 104 (40
4).

The communication control process 110 uses the pointer 152 and the pointer table 15 which indicate the received content processing procedure.
3 is sent to the received content interpretation process 113 (405).
The reception process 112 receives the reception frame corresponding to the transmission performed in step 404 from the external device 107 and sends it to the reception content interpretation process 113 (406). The received content interpretation process 113 interprets the content of the received frame by executing the procedure pointed to by the pointer 152 received in step 405 (407). Further, the reception content interpretation process 113 changes an appropriate flag from the flags in the external flag area 123 according to the interpretation result of step 407 (408). Here, the operation of the process can be controlled by sending a signal from the received content interpretation process 113 to the process in the main process group 310.

Further, the received content interpretation process 113 selects a pointer indicating a communication unit to be processed next from the pointer table 153 received in step 405 based on the interpretation result of step 407 (409). If the selected pointer indicates the communication unit to be transmitted next, the pointer linked to the communication unit is selected from the pointer table 153, and the process goes to step 411. If the pointer content is a null pointer, the process goes to step 412 (410).
When the communication unit to be transmitted next is instructed, the reception content interpretation process 113 copies a pointer pointing to the instructed communication unit to the pointer 122. Then, the pointer 122
The processing after step 403 is performed for the communication unit indicated by (411).

If the null pointer is selected, the reception content interpretation process 113 judges that the transmission of the communication list is completed, changes the flag of the external flag area 123, and discards the first element of the queue 120. Then, the next element in the queue 120 is copied to the pointer 122. Then, the processing from step 403 is performed on the pointer (412). This is repeated until there are no pointers in the queue 120.

In the first and second embodiments, the communication management means is composed of a queue, but the present invention is not limited to this. In the above embodiments, the main processor issues an instruction to start transmission of the communication list. Although it is automatically performed at the time of writing to the queue and at the time of detecting a null pointer in the interpretation of the received content, the selection control means may sequentially instruct the transmission start of each communication list. In this case, for example, put the identification code in the transmitted frame,
An external device assigns this identification code so that the frame is transmitted. When a frame is received from an external device, the corresponding transmission frame can be specified, and the communication unit designated by the pointer table can be newly transmitted based on the result of interpreting the received frame by the reception interpretation information. In this case, the processing of a plurality of communication lists can be performed in parallel.

Further, in this embodiment, the communication list is
Although all communication units having transmission frames are linked to each other, communication units having no transmission frames (for example, communication units having null frames) may be linked.
For example, it is possible to perform data transmission to the main processor using the interpretation information, communication management by counting processing, for example, forced interruption when an external device has a long response time, or repetitive processing. When a communication unit having a transmission frame and a communication unit having no transmission frame linked thereto are processed simultaneously in parallel,
When a frame is received from an external device, the link is reversed to obtain the interpretation information of the communication unit having the transmission frame, or when the communication unit having no transmission frame is executed, the communication having the immediately preceding transmission frame is used. It suffices to hold the interpretation information of the unit. These communication units may be standard communication units stored in advance and used as they are, or may be used by giving parameter data. Further, the communication unit pointer table may be used for other communication lists. May be called.
By doing so, the description of the communication list can be simplified and the storage capacity can be saved.

[0041]

As described above, according to the present invention, the information required for communication is passed to the communication control device in the form of a communication list and the received information is processed in the communication control device. Can reduce the load of communication processing.
Therefore, even when the processing of the main processor is time-limited, it is possible to immediately perform the necessary processing operation based on the content of the received frame, and to perform new transmission based on the content. Further, when the means for inputting the communication list is provided and the necessary communication list is appropriately input from the main processor, communication with an arbitrary external device can be performed and the capacity of the communication list storage means can be reduced. Further, when the communication list stored in the communication list storage means is designated, the transmission instruction from the main processor becomes simple and the load on the main processor can be reduced. Also, if a plurality of communication lists are combined in the order in which they are transmitted, and the transmission of the next communication list can be continuously performed after the transmission of one communication list is completed, if a plurality of external communication lists are transmitted. The transmission can be sequentially performed to the device, and it becomes unnecessary for the main processor to instruct the transmission of a new communication list at the end of each communication list, and the load on the main processor can be reduced. Further, when the communication unit of each communication list can be transmitted in the order of transmission of the communication list, and if it is configured to judge the transmission of the communication unit corresponding to the received information from the external device and interpret the transmission, a plurality of units can be transmitted. The communication processing of the communication list can be performed in parallel. Further, when the interpretation result is output only when the interpretation result satisfies a predetermined condition, only the result required by the main processor side can be obtained and the communication load of the main processor is reduced. be able to.

[Brief description of drawings]

FIG. 1 is a diagram showing a concept of a communication unit according to a communication device of the present invention.

FIG. 2 is a diagram showing an example of a communication list according to the communication device of the present invention.

FIG. 3 is a diagram showing a main configuration of a function realizing means of a communication device of the present invention.

FIG. 4 is a diagram showing a hardware configuration of a first embodiment.

FIG. 5 is a diagram showing a relationship between a software process and a data area according to the first embodiment.

FIG. 6 is a diagram showing a configuration of a communication unit according to the first and second embodiments.

FIG. 7 is a flowchart showing the operation of the first embodiment.

FIG. 8 is a diagram showing a hardware configuration of a second embodiment.

FIG. 9 is a diagram showing a relationship between a software process and a data area according to the second embodiment.

FIG. 10 is a flowchart showing the operation of the second embodiment.

[Explanation of symbols]

100 ... Main processor, 101 ... Main processor memory, 102 ... Communication processor, 103 ... Communication processor memory, 104 ... Communication controller, 105 ... Shared memory controller, 106 ... Shared memory, 107 ... External device, 110 ... Communication control process , 111 ... Transmission process, 112 ... Reception process, 113 ... Reception content interpretation process, 114 ... Queue control process, 115-1 to 115-1
15-n ... Communication request process, 120 ... Queue, 12
1 ... communication list storage area, 122 ... pointer pointing to communication unit currently in communication, 123 ... external flag area, 124 ...
Received content interpretation procedure storage area, 150 ... Communication unit, 15
1 ... Transmission frame, 152 ... Pointer pointing to received content interpretation procedure, 153 ... Pointer table pointing to communication unit that may perform next communication, 154 ... Received content interpretation procedure, 300 ... CPU, 301 ... Memory, 310 ... Main process group 311, communication process group 320, main process group memory area, 321 communication process group memory area, 3
22 ... Shared memory area

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Fumihiko Shibata, 2274 Hongo, Ebina, Kanagawa Prefecture, Fuji Xerox Co., Ltd. (72) Inventor, Hiroshi Ishikawa 2274, Hongo, Ebina, Kanagawa Prefecture, Fuji Xerox Co., Ltd.

Claims (6)

[Claims] 1. A communication unit comprising an interpretation information for interpreting the transmission information and the reception information, and a pointer table provided corresponding to a result of interpreting the reception information, and transmitted next by the pointer table of the communication unit. Communication list storage means for storing a communication list in which arbitrary communication units are linked by designating a communication unit to be transmitted, and selection for reading out the communication unit to be transmitted from the communication list stored in the communication list storage means Control means, transmission means for transmitting the transmission information of the communication unit selected by the selection control means to an external device, receiving means for receiving information transmitted from the external device, and communication selected by the selection control means Reception information interpreting means for interpreting the information received by the receiving means on the basis of the interpretation information in units, and the selection control means is a transmission start instruction. The communication unit selected at the head of the communication list according to the above, and the transmission information is transmitted by the transmission unit, and each time the reception unit receives information from an external device, the reception information interpretation unit selects the selected communication unit. According to the result of interpreting the received information based on the unit interpretation information, the corresponding pointer is selected from the pointer table of the selected communication unit and checked, and the transmission information of the communication unit designated by the pointer is transmitted. A characteristic communication control device. 2. A communication unit comprising an interpretation information for interpreting the transmission information and the reception information, and a pointer table provided corresponding to a result of interpreting the reception information, and transmitted next by the pointer table of the communication unit. It is characterized by comprising input means for inputting a communication list in which an arbitrary number of communication units are linked by designating communication units to be stored, and the communication list storage means stores the communication list input by the input means. The communication control device according to claim 1. 3. The communication list storage means comprises an input means for inputting information designating a communication list stored in advance, and the selection control means specifies the communication list designated by the input means in response to a transmission start instruction. 2. The communication control device according to claim 1, wherein the communication unit at the head of is selected. 4. The communication list combining means for combining a plurality of communication lists in the communication list storing means in a transmission order, the selecting means each time the receiving means receives information from an external device, the received information interpreting means. The received information is interpreted based on the interpretation information of the selected communication unit, the pointer corresponding to the interpretation result is checked from the pointer table of the selected communication unit, and there is a communication unit pointed to by the pointer. 4. The communication unit selects the communication unit, and if there is no communication unit pointed to by the pointer, selects the first communication unit in the communication list to be transmitted next and transmits the reception information. The communication control device according to any one of 1. 5. An order information storage means for storing order information transmitted by a plurality of communication lists of the communication list storage means, and a reception determination means for determining a communication unit corresponding to the reception information received by the reception means. The selection control means sequentially selects the first communication unit of each communication list on the basis of the order information and causes each transmission information to be transmitted by the transmission means, and the reception means receives the information from an external device. 4. The transmission information of the communication unit designated by the pointer corresponding to the interpretation result by the interpretation information of the communication unit discriminated by the reception discriminating means is transmitted every time the transmission is performed. The communication control device according to. 6. An output means for outputting an interpretation result, wherein the interpretation information has a method of interpreting the reception information and a condition for outputting the interpretation result, and the reception information interpreting means interprets the reception information. The communication control device according to claim 1, wherein when the result satisfies the condition to be output, the interpretation result is output by the output means.