CN1054870A - Synchronising communication with token and expanded application thereof - Google Patents

Abstract

The present invention relates to the access to netwoks control mode in the data network communications.Mainly by token line T, data wire D, synchronised clock CLK constitutes, and a major node and several is arranged from node in system.Major node is responsible for the driving of sending of token and clock line, and token is under the effect of synchronised clock, and each clock cycle moves once, only hold token from node, could carry out communication with major node.Realize the cable network data communication of point-to-multipoint simply, it is low very to be suitable for the requirement cost, the occasion that traffic is less.

Description

Synchronising communication with token and expanded application thereof

The present invention relates to the access to netwoks control mode in the data network communication.

In the data network communication that solves point-to-multipoint, great majority adopt the wheel river of star at present, total linear geocoding and more advanced, the CSMA/CDHO or the Token(token that widely use in the situation net) mode.Above-mentioned Control on Communication mode is not that line is too much, is exactly that communication protocol is too complicated, has improved the cost and the technical difficulty of each node greatly.

The objective of the invention is to avoid above-mentioned weak point of the prior art and a kind of synchronising communication with token and expansion application method thereof are provided.

The drawing of accompanying drawing is described as follows:

Fig. 1 (a) is a bus-type synchronous token network.Fig. 1 (b) is a token passing.

Fig. 2 is a loop configuration.

Fig. 3 is a CLK circuit diagram in the loop network.

Fig. 4 is a D circuit diagram in the loop network.

Fig. 5 is the token circuit in the node.

Fig. 6 takies the extended mode of 4 clock joint cypresses from the node circuit.

The present invention has following advantage compared to existing technology:

Because the synchronous token mode is provided token by independent line, and control its transmission by the synchronised clock that major node provides, thereby it is respectively very simple from the communication of node, it not only need not be any from the node identification circuit, also communications protocol that need not be complicated, all are in full accord from node, and equipment is simple, and very strong error correcting capability is arranged, thereby reduced the cost of equipment effectively.

The present invention carries out auspicious stating below in conjunction with accompanying drawing:

With reference to accompanying drawing 1(a), the synchronous token communication modes, this system is mainly by three signal line: token line T, data wire D, synchronised clock line CLK constitute, and a major node are set and several are from node.

With reference to Fig. 1 (b), token down transmits one by one from major node in each node, and token is by whole nodes, and major node just can be with all from node communication one time, and one-period is called complete communication cycle like this.In each complete communication cycle, major node only sends the token of a clock cycle, thereby can guarantee that each constantly, has only one to occupy token with node, major node can not issued an order board and be driven the synchronised clock that number surpasses whole nodes and come the whole network of initialization.

With reference to accompanying drawing 2,, then make major node might check whether the transmission of token is correct if will send major node back to from the token of node output at last, when finding mistake, the cancel data of last one complete communication cycle are carried out once again, can improve the reliability of communication.Because when the clock number that sends when major node equaled all from nodal point number, token was just got back to major node.

With reference to Fig. 3-4, the D line each from node except receiving one from the major node information that node transfers, also according to the rules communications protocol is sent to the information of oneself next from node, so that pass to major node from the D line when oneself occupies token.

With reference to Fig. 5, postpone the different mistakes that cause token passing in the neighborhood of nodes for overcoming long the causing of clock line, squeeze into clock with the edge of CLK as buffering, another is along the clock of squeezing into of doing the essence transmission.

With reference to Fig. 6, can send two requests from node, and two orders of reception major node, its circuit abnormality is simple, be very suitable for transmitting two to three or the occasion of more slightly signals, because major node is being controlled the transmission of token and can stored respectively from the communication protocol of node, therefore, the node that has than sophisticated functions also can insert in the network of this expansion synchronous token.Take a knot cypress continuously, except shift register approach, also can adopt counting or processor to realize.

Be intermediary and make one outside node carries out communication through major node, also can adopt and the classical the same method of token mode, one when node occupies token, send the packets of information that contains destination address, and target is accepted this packets of information from node according to the address, major node is monitored this two communications from node, when learning that a communication finishes, send CLK, realize the transfer of token, because token is by major node control, so realize the dynamic priority assignment of each node very easily.

Claims (2)

1, a kind of synchronous token communication modes and expanded application thereof, it is characterized in that the synchronous token communication modes, this system is by three signal line: token line T, data wire D, synchronised clock line CLK constitutes, and a major node and several being set from node, token transmits under the effect of synchronised clock (or control signal), and the communications access of node is simplified.

2,, it is characterized in that a node takies each clock of token joint cypress continuously, and effect that respectively takies the joint cypress of each joint cypress is distributed, thereby simplified the circuit of node according to right 1 described synchronising communication with token and expanded application thereof.

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