JPH0543638U - Information and communication control device - Google Patents

Abstract

(57) [Abstract] [Purpose] The response data frame for confirming the reception of the transmission data can process the normal data transmission as well, thereby improving the data transmission efficiency and the response to the communication node. [Structure] Regarding a token frame of a token bus access method, an operation bit indicating an operation of data transmission, a data reception response request, and a data reception confirmation response is provided in a control frame field thereof, and a return destination address for a reception response signal is further provided. Is characterized by.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a data transmission / reception control system for a token bus type local area network system.

[0002]

[Prior Art]

 FIG. 6 is a block diagram of a conventional token bus type local area network system disclosed in, for example, Japanese Patent Laid-Open No. 2-81533. In the figure, 66 is a transmission line, and 61, 62, 63, 64 and 65 are communication nodes (data transmission devices) connected to this transmission line. Further, FIGS. 7A and 7B are configuration diagrams of a token frame and a data frame transmitted on the transmission path, respectively. In the figure, 1 is a preamble (PRE AMBLE) for synchronizing at the data receiving side, 2 is a flag sequence (F), 4 is a data receiving side (destination) node address (DA), 5 is a data transmitting side ( (Source) node address (SA), 6 is a control frame field (C) that specifies the frame type identification and operation content, 7 is a frame check sequence (FCS) for detecting transmission errors, and 8 is a frame Postamble (POS T AMBLE) indicating the end, 12 is actual information data (INFO).

Next, the operation will be described. In the token bus type access method, each of the communication nodes a61, b62, c63, d64, ... Only the communication node that circulates the transmission path to the communication node and holds the token frame (FIG. 7A) can output the signal to the transmission path 66. Each of the communication nodes a61, b62, c63, d64, ..., N65 holds the token frame (FIG. 7A) if there is a data transmission request at the time of receiving the token frame (FIG. 7A). The reception side node address DA 4 and the transmission side node address SA 5 are set, and a data frame (FIG. 7B) to which actual information data INFO 12 and the like are added is sent to the transmission line 66. Then, the data frame (FIG. 7 (b)) reaches the receiving side node, and when the transmission is completed, the token frame (FIG. 7 (a)) is transferred again to the subsequent communication node. If necessary, the sending node sends to the receiving node a data frame with a response request to confirm whether the data has been sent normally, and the receiving node receives the data reception result (normal reception). Or abnormal reception) is sent back to the sending node.

[0004]

[Problems to be solved by the device]

 In the conventional token bus type access method, the receiving side node temporarily receives the token frame held by the transmitting side node and sends back the data frame of the receiving response to the transmitting side node. After confirmation of the above, the token frame for data transmission cannot be transferred to the next communication node, which improves data transmission efficiency and responsiveness to each communication node that has a new communication request. There were challenges.

The present invention has been made in order to solve the above-mentioned problem, and in addition to the reception response operation, a normal reception response data frame sent back from the reception side node to the transmission side node for confirmation of data reception is It is intended to provide an information communication control method capable of improving the data transmission efficiency and the responsiveness to each communication node having a communication request by being able to perform the data transmission operation.

[0006]

[Means for Solving the Problems]

 In this invention, in the token data frame of the token bus type access method, the control frame field is provided with operation bits indicating the frame operation of data transmission, data reception response request, and data reception confirmation response, and the data reception node The destination node address of the reception response is included in the token data frame in advance.

Further, when there is a data transmission request at the reception confirmation response at the data reception side node, the reception response destination node address is newly added to the data frame of the reception response.

[0008]

[Action]

 By the operation bit of the control frame field in this invention, the operation of data frame transmission, reception request, and reception response can be identified, and by setting the return destination node address of the reception response to the data frame used only for the data reception response. The normal data transmission operation can also be processed.

Further, only when a normal data transmission request is made from a communication node having a transmission path for a data frame for reception response, the return destination address of the reception response is included in the data frame for reception response. By adding, the data frame length can be shorter than that when there is no data transmission request.

[0010]

【Example】

 Example 1. An embodiment of the present invention will be described below with reference to the drawings in the case of a token bus type access method local area network. First, FIG. 1 is a block diagram of a token frame, and (b), (c), and (d) are configuration diagrams of a data frame during data transmission, reception response, data transmission, and reception response, respectively. In FIG. 1, 6 is a control frame field SA, 9 is a data transmission bit, 10 is a data reception response request bit, 11 is a reception confirmation response bit, 3 is a reception response destination node address (DA '), and other frames. The constituent elements are the same as those of the field structure shown in FIG.

Next, the operation of the embodiment will be described. First, in FIG. 6, the communication nodes a61, b62, c63, d64, ..., N65 have token frames (in this case, a → b → c → d → ... → n → a) in the order of a predetermined logical address table. It is assumed that the transmission line 66 circulates as shown in FIG. Here, there is a data transmission request from the communication node b62 to the communication node d64 and from the communication node k to the communication node 1 (however, 5 ≦ k <l ≦ n) from the initial state in which none of the communication nodes requests data transmission. Further, the operation of data transmission / reception will be described along the flow of the token data frame circulating on the transmission path 66, taking the case of requesting a reception response as an example.

In the communication node k62, before the data communication state is entered, the content of the data transmission bit 9 of the token frame (FIG. 1 (a)) from the communication node a61 is “0”. Make sure 66 is free. Then, the data transmission operation bit 9 is set to "1" and the reception response request bit 10 is set to "01", and the address of the communication node b62 is set to the receiving side (destination) node address DA4 and the transmission side (sending side). The original) node address SA5 is set to the address of the communication node d64, and the data frame (FIG. 1B) to which the actual information data INFO12 and the like are added is sent to the next communication node c63.

In the communication node c 63, if it is confirmed that the data transmission bit 9 of the data frame is “1” and the transmission path 66 is not in an empty state, the data cannot be transmitted even if there is a data transmission request. Further, since the receiving side node address DA14 and its own address match, no data is received and the data frame (FIG. 1 (b)) is transparently transmitted to the next communication node d64.

At the communication node d64, since the data transmission bit 9 of the received data frame (FIG. 1 (b)) is “1”, the transmission line 66 is not in the empty state, and the received frame is the data frame. It is determined that After confirming that the receiving side address DA4 matches its own address, and if it is judged by the error detection sequence FCS7 that the received data is normal, the actual information data INFO12 is fetched and the data frame (Fig. 1 (b)) is fetched. ), The actual information data 12 is erased, the data transmission bit 9 is set to "0", and the reception confirmation response bit 11 is set to "01". Then, the data frame (bit pattern 1 in FIG. 1 (c)) obtained by copying the contents of the transmission side node address SA5 to the reception response destination node address DA'3 is sent to the next communication node. Thereafter, the data frame similarly circulates on the transmission line 66.

Next, when the data frame (bit pattern 1 in FIG. 1C) arrives at the communication node k that has made a data transmission request, the transmission line 66 is in the empty state from each operation bit of the control frame field as described above. , The data transmission bit 9 is "1", the reception response request bit 10 is "11", the transmission side node address SA5 is the address of the communication node k, and the reception side node address DA4 is the address of the communication node l. The data frame (FIG. 1 (d)) to which the actual information data INFO12 or the like has been added is transmitted to the next communication node.

Next, the communication node 1 receives the data from the communication node k from the arrived data frame (FIG. 1 (d)) in the same manner as the algorithm for receiving the data at the communication node d64. When data reception is completed normally, the data transmission bit is set to "0", the actual information data INFO12 is erased from the data frame (Fig. 1 (d)), and the reception confirmation response bit 11 is set to "11". The data frame (bit pattern 2 in FIG. 1 (c)) is sent to the next communication node.

Next, the communication node b 62 receives the data frame (bit pattern 2 in FIG. 1C) that circulates between the communication nodes, and sets the reception response destination node address DA ′ 3 to its own address. After confirming that they match, it is judged from the reception confirmation response bit 11 whether or not the transmission data is normally received. Also, reception response request bit 1
It is confirmed that 0 has accepted the data transmission request of the communication node (here, node k) while the reception response is returned from the reception side node d64 from "11", and the address of the transmission side node k up to that point The contents of SA are set in the reception response destination node address DA'3, and further, the data transmission bit 9 is set to "0", the reception response request bit 10 is set to "01", and the reception confirmation response bit 11 is set to "01". The data frame (bit pattern 1 in FIG. 1C) is sent to the next communication node.

When the communication node l receives the acknowledgment information from the communication node l to the communication node k (bit pattern 1 in FIG. 1 (c)) and reaches the communication node k, the same processing operation as that in the communication node b62 is performed. Reception confirmation is performed, and the token frame (Fig. 1 (a)) with the reception response request bit 10 set to "00" and the reception confirmation response bit set to "00" is sent to the next communication node.

In this way, the data transmission / reception and the data reception response are completed. Fig. 2 shows the data processing algorithm in the communication node at the time of data transmission and Fig. 3 at the time of data reception.

Example 2. In the above embodiment, the data reception response destination node address is added and set in advance in the token frame. However, when a data frame for a reception response sent from the data receiving node is transmitted to a certain communication node, When there is a data transmission request in step 1, a new data reception response destination node address is added and set, and a reception response destination node address is added so that it is deleted when there is no transmission request after the completion of the data reception response. The same effect as in the above embodiment can be obtained by changing the data transmission request depending on the presence or absence of the data transmission request. That is, since the reception response destination node address DA′3 is equal to the data transmission side node address DA4, the transmission side node address DA4 is used instead of the reception response destination node address DA′3 until another transmission request is made from another transmission node. Can also be used.

When the communication node k requests transmission of the data frame of the data reception response (FIG. 4A), the reception responsive node address DA′3 in which the address of the transmission side node b62 up to that time is set Is newly added to the reception response data frame (FIG. 4 (b)). Subsequent data transmission / reception operations are the same as those in the above embodiment.

[0022]

[Effect of the device]

 As described above, according to the present invention, the reception response data frame for confirming the reception of the transmission data allows the frame operation to be performed in the reception response destination node address and the control frame field so that the normal data transmission can be processed. Since the operation bit to represent is additionally configured, there is an advantage that the transmission efficiency and the responsiveness to the communication node having the data transmission request are improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a token frame and a data frame according to a first embodiment of the present invention.

FIG. 2 is a data transmission algorithm according to the first embodiment of the present invention.

FIG. 3 is a data reception algorithm according to the first and second embodiments of the present invention.

FIG. 4 is a configuration diagram of a token frame and a data frame according to the second embodiment of the present invention.

FIG. 5 is a data transmission algorithm according to the second embodiment of the present invention.

FIG. 6 is a configuration diagram of a conventional token bus type roll area network system.

FIG. 7 is a configuration diagram of a token frame and a data frame.

[Explanation of symbols]

1 Preamble for synchronization on the data receiving side 2 Flag sequence 3 Reception response destination node address 4 Data receiving side (destination) node address 5 Data transmission side (source) node address 6 Frame type identification Specify operation contents Control frame field 7 Frame check sequence for detecting transmission error 8 Postamble indicating end of frame 9 Data transmission bit 10 Reception response request bit 11 Reception confirmation response bit 12 Actual information data

Claims (1)

[Scope of utility model registration request] 1. In a bus type local area network system, a token bus type access method is adopted as an access method to a transmission line of each node (data transmission device) connected to a bus, and in a token data frame, Send data to control frame field,
An information communication control device comprising operation bits for a data reception response request and a data reception confirmation response, and the data reception side node having a return destination node address of the reception response in advance in the token data frame.