JPS5856551A - Discriminating system for rotating connecting state by slave station control procedure - Google Patents

Abstract

PURPOSE:To improve the rotating efficiency for point-to-point exclusive connection, by providing a discriminating function for same slave station control means, in a data communication system. CONSTITUTION:The user designates point-to-point or multi-point informing system for a slave station. Through this designation, a slave station control program gives information to a communication control program with a channel command word CCW. The communication control program discriminates the connection whether it is point-to-point or multi-point with the CCW information, and when it is the point-to-point connection, a carrier channels are remained ON and when it is the multi-point connection, the carrier control is done. Thus, in case of the point-to-point connection, the time for the carrier channel control can be saved.

Description

[Detailed Description of the Invention] In the conventional system, whether there is one or more slave computers connected to one data communication line, the slave computers are connected to the central computer. The slave station control procedure is the same, and the transport connection path is turned on every time a message is sent for any connection.

Turn off, and turn on the transport connection between the messages.

Needed connection time to turn off.

In the case where there is only one electronic IT computer for the slave station, that is, in the case of a point-to-point dedicated connection, the transport connection path is not turned off while a series of messages are being sent; In other words, in the case of a multi-point connection, the purpose is to control the conveyance connection path every four sentences as in the past. In order to achieve this purpose, the present invention uses one central computer and one or more In a data communication system in which electronic computers for slave stations are connected by one data communication system (71-), the data communication system 11 is The main feature is to identify whether there is one or multiple connections to the line and to control the transport connection path.

In general, the same control procedure can be used for the slave station controller JW to send a message to the central Shizuko S unit whether there is one or more slave stations, that is, whether there is a point-to-point dedicated connection or a multi-point connection. In general, 6 degrees, therefore, the transmission connection path is turned on for each message sent, just like in the case of multi-point connection.
It turns off.

The connection control time for this is added, which increases the total transmission time of the message, that is, the circuit usage time of the transport connection path, and the circuit efficiency deteriorates. In the present invention, by providing an identification function in the same slave station control procedure, the point-to-point dedicated 1t
Improving Line Efficiency in Continuation A block diagram of a data communication system with a multi-point connection in which the transport connection path is controlled for each message as in the past is shown.

In the figure, 1 is a central electronic computer, 2 is a slave computer, and 3 is a data communication circuit II8. Figure 2 shows a comparison diagram of the point-to-point connection and control of conveyance connection paths between the method according to the present invention and the conventional method. As shown in the figure, this method saves time due to turning on and off the transport connection path (carrier) compared to the conventional method.

FIG. 3 is a block diagram showing an example of a method in the slave station control procedure of the present invention. When creating a /stem for a slave station, the user specifies whether it is a point-to-point connection or an 11 point connection. With this specification, the slave station 111
1 (1 program (VTAM) notifies the constant value control program when the slave system is woken up. In other words, the slave control program connects CCW cloak (bit O is O) or connects to the control point (
The second byte, which has the information that bit 0 is 1), is the own station address, and serves as the address for polling from the host combinator or the stage access for select ink. The communication control program is based on whether bit O of the first byte of CCW is O or point-to-point *fl! If it is a point-to-point connection, the carrier connection path (carrier) is kept on, and if the multipoint connection is 0, the carrier system is used. In the figure, ■, ■, ■, ■ indicate the order of operations in the slave station control procedure.

As described above, in the case of a point-to-point connection, Q) time is saved for dryer control, so that the circuit efficiency is improved. The carrier control time is approximately 40 milliJ seconds in IBI (U), and if the number of messages is 14a, it is 40 x n
i 17 seconds carrier occupation time is saved.

[Brief explanation of the drawing]

Figure 1 shows a block diagram of a data communication system with point-to-point connection and multi-point connection, and Figure 92 shows a comparison of carrier control between the unconventional method and the conventional method in point-to-point connection. 1 is a block diagram showing an embodiment of a method in a slave station control procedure of the present invention; FIG. In FIG. 1, 1 is a central computer, 2 is a slave computer, and 3 is a data communication line. ■ Point 1 Tsuku F°I> LKf Island Hi■ MaI
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Claims (1)

[Claims] In a data communication system in which one central computer and one or more slave computers are connected by one data communication line,
A program that sends a message from the electronic computer of the slave station establishes a connection with the data communication line -? Or, it is a time based on a slave station control procedure characterized by identifying plurality and controlling the conveyance contact path! lI connection state classification method.