JPS625749A - Recognizing system for station position - Google Patents

Abstract

PURPOSE:To make each station recognize connection sequence within a closed ring transmission path sending a frame in which the initial value is set, from a reference station to all other stations and repeating a process to send out a new frame in which an updated value is set destinated to all stations only by the station that received the frame in the first place. CONSTITUTION:An ST (reference ST) sends out the frame having the information of connecting relative value '1' indicating multiple address (destinated to all stations) and the ST that receives the frame first interchanges it representing the frame received. And the ST forms the new frame having a value, for example, the value that one is added on the connecting relative value (designated as '2') and sends out it indicating as the multiple address. On and after, each ST repeats the operation. Also, each ST neglects the frame represented as received. Thereby, each ST can recognize the physical difference of connecting position from the reference ST by updating the connecting relative value located in order in the direction of data transmission.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to the operation and maintenance of a ring network, and in particular to station locations suitable for ascertaining the locations of stations (hereinafter referred to as STs) making up the network. Regarding recognition method.

[Background of the invention]

In the conventional method, as described in Japanese Patent Application Laid-Open No. 58-117750, information on the order of arrangement within the ring (physical local identifier) is given to the ST using a special device. It is not possible to provide the information to a plurality of STs with a device, and each ST needs to have each of the devices.

[Purpose of the invention]

An object of the present invention is to allow all STs in a network to grasp order information within a ring without using any special equipment.

[Summary of the invention]

An important issue is how to easily know where the ST that is the target of operation and maintenance is physically located. In other words, the network can freely change the arrangement of stations within a ring, so it is not possible to know where a station is within the ring using only the station's fixed address (transmission/reception address). Knowing where a device is physically located is important for improving operational and maintenance efficiency.

The present invention solves the above problem by providing each ST with an address (management address) that is different from the address used for normal communication (transmission/reception address). The management address is information useful for knowing the physical location of the ST. Operation and maintenance are performed using management addresses.

The ST obtains the management address by the following procedure. The feature of the ring network as a serial system, that is, the upstream ST receives a communication frame before the downstream ST in the data transmission direction, is utilized. When an ST that receives a frame sets a received indication on the frame and relays it, the next ST that receives the frame is an ST that received the frame upstream from its own ST if the received indication is set. can recognize that it exists. This makes it possible to distinguish a particular ST from others. Now, a certain ST (
A frame having the information that the reference ST) has the value (relative connection value) "1" is sent out by broadcasting (addressed to all STs) by specifying the address. The ST that first receives the frame sets a received indication and relays it. Then, a new frame having a value (here, "2") which is the connection relative value plus 1, for example, is formed and sent by designating a broadcast address. Thereafter, each ST repeats this operation, and each ST ignores the frame with the received indication. As a result, each ST can recognize the physical connection position difference from the reference ST by updating the connection relative value in the order in which they are arranged in the data transmission direction.

Next, there are the terminal stations, that is, the reference ST and the next “upstream” ST.
Consider the procedure for recognizing upstream and downstream relationships at (terminal ST). The reference ST can recognize the upstream/downstream relationship with the terminal ST by receiving a frame including the connection relative value (however, the received indication is not set). However, in this state, the terminal ST cannot recognize that its own ST is the terminal (that is, the next upstream of the reference ST), so it cannot recognize the upstream/downstream relationship with the reference ST.To make this recognition possible, the terminal ST must It is necessary to make the ST understand that this is the case.

In the present invention, each ST is freely disconnected from the network and the number of STs connected to the ring is not constant.
Let us know the number of The connection relative value updating procedure is performed around the ring at least twice. By making two rounds, all STs on the ring can be made to recognize the relative positional relationship with other STs. For example, in an ST composed of 250 STs, for example, on the -th round "75 The ST with the value “325” becomes “325” in the second round, and from this difference the total ST
I can recognize the number 250. Also, the ST of "250" on the - round becomes "s o o" on the second round, and it becomes exactly the second value on the - round, so the own ST is the final ST, that is, the next upstream of the reference ST. It is possible to recognize that the ST is located.

[Embodiments of the invention]

FIG. 1 is a schematic diagram of a communication system implementing the present invention. In Fig. 1, 1 is a ring-shaped transmission line, 2-11...
・, 2-6 is a ring communication adapter, 3-1, ..., 3
-6 is a data terminal device. In such a communication system,
Each ring communication adapter is connected in a ring shape. Each data terminal device can communicate with each other by being connected to a corresponding ring communication adapter. A data terminal device may include one or more devices such as a display device, a microcomputer, a data acquisition device, etc. The function of this system is to exchange or distribute data between these devices. Note that the ring communication adapter and the data terminal device can also be collectively referred to as a station.

FIG. 2 is a functional block diagram of the ring communication adapter.

The ring communication adapter includes a ring connection mechanism 30. It consists of electronic circuitry that performs electrical signal conversion for data sent to and received from the ring. Such signal conversion includes modulation and demodulation. The ring connection mechanism 30 receives data (
The ring connection mechanism 3o receives the serial data (serial data) and sends the data to the ring output line 41, and further extracts a timing signal from the received data and uses it to synchronize the transmitted and received data.

Ring attachment 30 is coupled to ring protocol management 32 via lines 42, 43 and 44. The data received from the ring input line 4o.

line 42 to ring protocol manager 32. Line 43 is a clock line for sending the aforementioned timing signal and is used to synchronize data transfer. Line 44 is a line for transmitting data signals to be synchronized and sent out to the transmission ring from ring protocol manager 32 to ring connection mechanism 30.

When the ring protocol management mechanism 32 recognizes a communication frame destined for its own ring communication adapter, the ring protocol management mechanism 32 copies the communication frame to the temporary storage mechanism 34 . The ring protocol manager 32 has lines 45, 46 and 4.
It is connected to the temporary storage mechanism 34 via 7. Lines 45 and 47 are lines for transferring data between temporary storage and ring protocol managers. read/write signal.

Control information such as address signals and timing signals are sent to line 4.
6 and is sent to the temporary storage mechanism 34. Furthermore, data exchange between the temporary storage mechanism 34 and the data terminal device is
This is done via lines 48 and 49. Ring protocol manager 32 sends data stored in temporary storage 34 to the transmission ring.

Figure 3 shows the structure of a communication frame. In Figure 3,
11 is a starting delimiter indicating the start of an array:
S D, 12 is a frame control indicating the type of frame: F C1
13 is the destination address (Destination Add
ress): DA, 14 is the sending address (S
source Address): S A, 15 is information (Iuformation): INF
O116 is a frame check sequence (Frama
Check 5equence): FC8 and FC17 are end limiters (Eud
ing Delimiter): ED, 18 is a frame status (Frame 5 status): FS that reflects the reception result of the frame. The next frame is provided for updating the connection relative value described above. If FCl2 is 1 byte, FCl2:B
Let '01000011' be a frame with connection relative value information (hereinafter referred to as adjustment frame), and FCl2:B'
Frames other than 0100000011 are frames other than adjustment frames. The internal configuration of INFO 15 of the adjustment frame is 1, for example, information type (Vector Identifier).
r): V119 and information value (Vector Value)
: V V Divided into 20. V119 and VV2
The size of 0 can be determined in advance. Here V119
is a connection relative information display, and VV20 is a connection relative value.

Note that the FS of the adjustment frame is indicated as being received by the ST that first received the frame.

FIG. 4 shows the adjustment frame reception operation flow of the ring communication adapter, especially the ring protocol management mechanism therein. First, as a premise of this operation flow, the ring communication adapter (reference ST) starts updating the connection relative value. sets the internal adjustment cycle counter (N) to 0. Then, the adjustment frame is sent out. DA of this adjustment frame
13 is the broadcast address, and VV20 is the reference connection relative value (
1), and it is assumed that FS18 indicates that it has not been received. The ring protocol management mechanism that receives this adjustment frame first checks the FS 18 (100), and if the frame has already been received, it ignores (discards) it. If it has not been received, then it is checked whether the own ST is the reference ST (101). If it is the reference ST, the adjustment cycle counter N is updated (plus 1) (1
02) L, check whether the reference ST has sent the adjustment frame twice or more, that is, whether N is 2 or more (103). If N is 2 or more, finish updating the connection relative value. . If N is not 2 or more, or if the FS 18 receives an adjustment frame indicating that it has not been received but its own ST is not the reference ST, it sends a new adjustment frame. The value obtained by adding 1 to the received connection relative value VV20 is set as the connection relative value of the own ST (1.04), and a new adjustment frame is created.

The new adjustment frame sets the self-connection relative value to its VV20
105), and store the circular address in DA13.
The FS 18 is set to be unreceived and sent out (106).

FIG. 5 shows the update status of the connection relative value. In FIG. 5, 200 is the relative connection value of the ST, solid arrow 201
is the flow of adjustment frames with FS18 set as unreceived,
A broken line 202 shows the flow of adjustment frames for which the FS 18 is set to have been received. In FIG. 5, each ST updates the connection relative value twice. Therefore, it has two self-connection relative values. As a result.

All STs can know the number of STs connected to the ring transmission path, and can recognize their upstream and downstream relationships, including the degree to which they are separated from each other (that is, the number of STs existing between them).

As an application of this embodiment, the following procedure can also be used. The reference ST does not send out the second adjustment frame, but instead notifies the other STs of the total number of STs.

The reason why the reference ST can recognize the total number of all STs is that the FS transmitted from the terminal ST when sending the first adjustment frame
This is because when the reference ST receives an adjustment frame for which No. 18 has not been received, it can be recognized that the number obtained by subtracting 1 from the connection relative value of the adjustment frame is the total number of all STs. In short, by having all STs understand the total number of STs and relative connection values, it is possible to recognize the upstream or downstream relationships of each ST from any point on the ring transmission path, including the extent to which they are separated from each other. become.

〔Effect of the invention〕

According to the present invention, it is possible to make all STs in a ring network aware of upstream and downstream relationships, including the extent to which they are separated from each other, without requiring any special equipment.

[Brief explanation of drawings]

Figure 1 is an overall configuration diagram of a system to which the present invention is applied;
Figure 3 is a configuration diagram of the ring communication adapter, Figure 3 is a configuration diagram of a communication frame, Figure 4 is the connection relative value update operation flow, and Figure 5 is a configuration diagram of the ring communication adapter.
The figure shows the connection relative value update status. Tomi 1 Figure TomiZ Figure 3

Claims (1)

[Claims] 1. In a station position recognition method for a communication network system in which a plurality of stations are connected in series to a closed ring transmission line that transmits data in one direction, initial values are set from a reference station to all other stations. Only the station that first received the frame recognizes the first frame, updates the value set in it, recognizes it as the connection order within the closed ring transmission path of its own station, and A station position recognition method characterized in that a new frame addressed to all stations is sent with an updated value set, and each station repeats the above process, thereby making each station recognize the connection order in a closed ring transmission path. . 2. In item 1, each station repeats the process twice in a closed ring transmission path, thereby causing itself to send out a new frame twice, and receiving the frame at each station. A station position recognition method characterized by recognizing the upstream and downstream relationships of each station by recognizing the total number of all stations connected to a closed ring transmission line based on two values set in two frames. .