JPS5963840A - Method for controlling transmission - Google Patents

Abstract

PURPOSE:To prevent the duplicated registration of the same address in a system by processing a management work related to data transfer between communication stations by a control processor. CONSTITUTION:A control station LC4 receives a station controlling slot. Each communication station receives a loop controller controlling slot having a synchronous code and a destination station address for the self-station, a broad cast slot in which a flag is set up, and a communication slot having a destinated station address for the self-station in which a flag is set up.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a transmission control method for transferring data between a plurality of communication stations.

Prior Art A conventional transmission system of this type is shown in Figure 1.+7)
75E Atsuta. Figure Nioite (1a), (1b), (1c
) are respectively communication stations (the drawing symbol is S
T, ST, STc), (2a),
(2b).

A B (2c) is a terminal, (3) is a loop-shaped transmission line, and (4) is an fi control station (designated as LC in the drawing). Terminal (2a), (2b),
(2c) uFor example, the data stored in it is 2'xf-john (l
a) , (lb), (lc) are transferred to each other via f. The transmission line (3) is composed of a coaxial cable, an optical fiber, or the like.

Signals are transmitted on the transmission path (3) in the form of bit series. Figure 2 is a diagram showing the format of the signal transmitted on the transmission line (3), where 5YNC indicates a synchronization signal, one frame is comprised between the synchronization signal 5YNC and the next synchronization signal 5YNC, and one frame It contains n communication packets in addition to the synchronization signal 5YNC, and each packet contains a flag indicating that F is in use, DS-AD is the destination station address, and S S -A DH is the source station address. , CTL i'j: fffll ml field, DATA is data.

The control station (4) serves as the clock (I!11) for the entire system, and sends out the synchronous message 5YNC at a constant cycle.The synchronous signal iff consists of a specific predetermined bit pattern, and this bit pattern is detected. By doing this, the communication station can detect the position of the synchronization number 411 and know the position jM! of each packet in the frame.

each) lfl communication station (la) ', ' (lb)
, (lc) and control fill station (4
) is equipped with a shift register, and the signal from the transmission line (3) is input from the 'W column signal generator of this shift register, is shifted at a predetermined clock, and is output from the serial signal output terminal of the shift register. is outputted to the transmission line (3) and added to the serial signal output terminal of the shift register in the station located at fAr below the signal flow. goes around once.

Each communication station reads a signal from the parallel signal output terminal of the shift 1/register within the station, and writes a desired signal to the shift register from the parallel signal input terminal of the shift register.

The communication station where the data transfer request has occurred reads the flag F indicating whether or not the packet is in use for each packet, and if it detects a packet that is not in use (i.e. empty bucket) 1, the packet's flag Ff: Used. Set to middle display, DS-AD, SS-
AI), CTL, and DATA (Fig. 2) are all written in a certain manner and sent to the downstream transmission line (3) in the data flow.

The %a communication station always checks the DS-AD address of the packet whose flag F indicates it is in use, and if it matches the address of its own station, it reads the packet and clears the flag F ( (display indicating unused). In this case, one communication station may have 1f+i+j'i or more station addresses that can be set by a program in addition to its own unique address.

For example 1', the unique station address HA of station STA (1a). However, if it is possible to set the address Ax + A2 by the program, then at station 5TA (la), D
The bit pattern of S-AD is A. r At + A2
It is necessary to detect whether the pit pattern matches any one of the pit patterns, and a comparison circuit for this purpose is provided as Ao +
For AI and A2, respectively (Ii:i must be changed.

At the station that sent the data using three packets, the packet goes around the transmission path (3) and is sent to 111.
If the flag F is cleared when the terminal returns to its own station, it knows that the data S' has been received at the destination.

If the destination communication station is out of order,
:3) There is a circuit in which the earth signal bypasses that station and is input directly to the next station.
1', and therefore, at the source station, the flag F of the packet sent by itself is cleared and the packet returns without being cleared. In this case, the source station clears flag F and treats the data transfer as having ended unsuccessfully due to "destination bypass."

The conventional transmission system Q↓ is configured as described above, so when an 11jl communication station holds one or more types of station addresses that can be set by program in addition to the unique address, all of these station addresses A comparator circuit must be provided to compare the destination station address Ds-AD in the packet, and an accident may occur where different communication stations use the same address. Ta.

Purpose of the Invention The present invention has been made to eliminate the drawbacks of the conventional ones as described above, and even if there is a communication station that maintains addresses that can be set by a program, different communication stations can use the same address. The purpose of this invention is to provide a transmission system in which such an accident does not occur, and in which each communication station only needs to be equipped with a comparison circuit corresponding to its own unique station address.

Structure of the Invention In order to achieve the above-mentioned object, the present invention provides a controller HI processor as a terminal device of a control station,
Data transfer operation between each communication station
This system handles related management tasks.

In other words, the tasks handled by the control processor are (a)
To a communication station that requests registration of a station address other than its own unique station address,
Only if the registration of the address is not a double registration, register the address and notify the corresponding communication station, (b) sequentially specify the Seishin stations and have them report their status. ← ← 1 Status of all communication stations 1 - Broadcast to all communication stations 1 , (c) Specify the destination from the communication station I, 1
When a 1-line connection is requested, the communication slot number is specified and a link establishment command is given to the communication station that uses a station address other than the station address unique to the own station. , converting the address being used into an address unique to the communication station and sending it out.

EXAMPLES Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 3 is a block diagram showing an embodiment of this invention, and in FIG. 7A3, the same reference numerals as in FIG. 1 indicate the same or equivalent parts,
(5) is a control processor (the drawing symbol is LP). FIG. 4 is a diagram showing the format of the signal transmitted on the transmission path (3) in FIG. 3, where 5YNC is the synchronization code f:
1 bit to configure LC8T 1 bit to configure Haroop controller control slot 4'4 5TST 1 bit to configure station 1ill control slot, BC
:T is 1 bit that constitutes a broadcast slot,
CMSO7CMS(n-1) is number 0 to ff1(n-
This is 1 bit that constitutes the communication slot of the n-channel number 1). Therefore, one frame consists of (4+n,) bits.

In the configuration shown in Figure 2, each packet is time-divided, but
In the 81♂1 configuration shown in FIG. Assuming that LC8T is transmitted and the communication slot CMSO is made up of q pits, one CMSO is transmitted every q frames.

FIG. 5 is a diagram showing the transmission path of the loop controller control slot LC8T.
It reaches the designated communication station (5TA in the case of FIG. 5) via the i-station LC+41, and command signals such as a status collection command and a link establishment command are sent.

Figure 6 is a diagram showing the transmission path for the station control slot 5TsT, and the communication station (5TA in Figure 6)
From there, the information reaches the controller L P (5) via the control station L C+41, where status reports, address registration requests, line connection requests, etc. are sent.

FIG. 7 is a diagram showing the transmission path of the Broadgeast slot BC8'l', from the control processor LP(5) to all communication stations via the control station LC+41, and the status information of all communication stations to all communication stations. to transmit.

Figure 8 is a diagram showing the transmission path of CMS (communication throat).It is a diagram showing a CMS transmission path between two communication stations (in the example of Figure 8, STA and ST
and between STo and STD) are relinked by this slot. Slot assignment is done by control processor L.
Perform P (5).

Therefore, the control station L C+41 receives the station control slot 5TST, and each communication station receives the synchronization code, the loop controller control slot whose destination station address is its own, and the flag (
If the broadcast slot (FLAG) is set and the communication slot (FLAG) is set and the destination station address is own, the CMS receives.

The method of transmission i1ill (jill) is performed in the steps described below.

(a) LP uses LCST to send a status transmission command to the communication station specified by the destination station address. - (b) The communication station that received the status transmission command uses STST to send its own status information to the LP.

Status information includes terminal down, station down, binoculars in progress, etc.

(c) When I and P collect the status information of all communication stations, they transmit the status information of all communication stations to all communication stations using RCST.

cd) Each song (M station can have one or more station addresses that can be set by program in addition to the unique address, and can communicate with this address. Unique atto 1/s 1υ A communication station requesting registration of an external address uses the iSTST to request the LP to register, and the LP that receives the registration request confirms that the requested address is not already registered, and then registers. The reception response is sent to the communication station using LCST.

(e) Communication station i where the data transfer request occurred
t Specify the destination station and send a line connection request to STST.
This will give you 1 coin on LP.

(t) The LP that receives the connection request checks whether the CMS is free, whether the status of the destination station is normal, and whether the destination station has established a link with another station; If this condition is not met, a response indicating that line connection is not possible is sent to the requesting station.
Send using ST. When the above conditions are met, a vacant communication slot is assigned and a link establishment command using LCST't- and the assigned communication slot number are sent. At this time, if the destination station address is an address set in the program, the LP converts this into a unique station address and sends it. Therefore, each communication station only needs to be provided with a comparison circuit for a unique station address.

(g) Both communication stations that received the IJ link establishment command transfer data using the designated communication slots 11r and s5.

In the embodiment shown in FIG. 3, the transmission path (3) is a loop transmission path, but the method of the present invention can be similarly applied to a multi-drop type transmission device as shown in FIG. In FIG. 9, the same reference numerals as in FIG. 3 indicate the same or corresponding parts. Further, instead of the bit multiplexing time division shown in FIG. 4, the block multiplexing time division shown in FIG. 2 can be used, or instead of the time division, frequency division can be used.

As can be seen from the effects of the present invention, in this invention, the π-I+ processor is
i! 1.1. Since the status information, address registration information, and link information of all communication stations are managed centrally, it is easy to know the traffic of the transmission line and information necessary for maintenance. This has the advantage that it is possible to prevent the information from being registered twice, and to simplify the communication station side.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing a conventional loop transmission system.
2 is a diagram showing the format of the signal transmitted on the transmission path in FIG. 1, FIG. 3 is a block diagram showing an embodiment of the present invention, and FIG. Figure 5 shows the format of the signals to be transmitted. Figure 5 shows the transmission in the loop controller surface control slot, Figure 6 shows the transmission in the station control slot, Figure 7 shows the format in the broadcast slot, and Figure 8 shows the transmission in the communication slot. FIG. 9 is a block diagram showing another embodiment of the present invention. (la), (], b), (lc)...respectively communication stations, (2a), (2b), (2c)...
Terminal, (3)...Transmission line, (4)...
- Control station, (5)...control processor. Note that the same reference numerals in each figure indicate the same or corresponding parts. Agent story Nobu Nobu - Figure 1, 2nd FM, 3rd v! J Figure 7 Figure 8 Figure 9

Claims (1)

[Claims] A transmission control method when a number of communication stations transfer data between communication stations in a time-sharing manner under the control of a single control station. and a control processor (f) connected to the control station.
[il] Specify a desired communication station using the loop controller control slot, which is one time-sharing slot, via the il switch and instruct that the status of the communication station should be reported]b All steps; A status reporting stage [beak] in which the communication station commanded by the command stage sends the status of the communication station to the control processor using the station control slot, which is one time-sharing slot; There is a stage in which the control processor, which has collected the status of the stations, sends the status information of all communication stations to all communication stations using a broadcast slot, which is a time-sharing slot, and a request to set an address that can be set by a program is generated. The communication station uses the station control slot to send the address for which settings are requested to the control processor, and if the address for which the settings are requested does not overlap with an already registered address, the control processor registers it as a new address and registers it. Sending a reception response to the communication station using the loop controller control slot; and the communication station requesting data transfer designating the destination communication station and requesting the control processor to connect the line using the station control slot. The control processor, which has received the line connection request, allocates an unused slot among the plurality of communication slots provided in a time-division manner to communicate between the communication station of the transfer request and the destination (m).
1 liter of the above loop controller for the station
Use the Tsukuda I slot to send out the Thronto Gogo assigned above and the link establishment command, and if this J↓A destination station address is set in the program and is an address with a "+", it becomes an address with 1^1. The present invention is characterized in that it includes a stage 1 for converting and transmitting the data, and a stage for executing data transfer by using the assigned slot #1fc number 11'I between the communication station that received the link establishment command. Transmission open side 1 method.