JPS6030239A - Setting system of communication speed - Google Patents

Abstract

PURPOSE:To set a communication speed in a short time without increasing the number of communication devices by permitting a start-stop system data communication device to discriminate the communication speed on the basis of predetermined data from a connected terminal equipment. CONSTITUTION:A terminal equipment T which desires to have a communication with an information processor HC calls an exchange EX, and transmits special data predetermined for communication speed discrimination when connected to an optional communication device CU. The device CU transmits this special data to a communication speed table TBL. The speed table TBL consists of a storage device stored with communication speeds (s) corresponding to discrimination results which are transmitted as addresses from a start-stop system transmitting and receiving circuit UART, and a communication speed (s) corresponding to the transmitted discrimination result is outputted and transmitted to the circuit UART. The circuit UART starts communicating with the connected terminal device T at the communication speed (s) transmitted from the speed table TBL.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a start-stop data communication device, and in particular to a start-stop data communication device that can be set to an idle communication speed.
(Regarding the 1i JI communication speed setting method.

(hl Background of the Technology There are more than 10 types of communication speeds for start-stop terminal devices, ranging from 100 pino I/sec to 9,600 bits/sec. Therefore, they can be connected to terminal devices with various communication speeds via exchanges. The information processing device needs to include a communication device that enables communication at the various communication speeds described above.

(e) Prior Art and Problems FIG. 1 is a diagram showing an example of a conventional communication device. 1st
In the figure, the information processing device 11C is accommodated in the exchange fPJEX via communication devices CUI to CUn, each having a different communication speed. Each communication device CUI to C
U n are selected by different selection numbers.

A terminal device T that communicates with the information processing device 1-IC via the exchange EX selects a communication device CUi (i is 1 to n) having a communication speed equal to its own communication speed, and performs communication.

As is clear from the above explanation (a conventional communication device CIJ
I to CIUn were classified according to communication speed. Therefore, there is a drawback that the number of communication devices required and the number of terminals accommodated in the exchange chamber increase. One way to do this is to provide one type of communication device that can be set to any communication speed, and after the terminal device F connects to any communication device using a unique selection number, a predetermined communication speed is set for the speed change request. A special signal (for example, continuous transmission of a break signal) is sent. The communication device that receives the special signal sequentially changes the set communication speed and returns predetermined data. When the communication speed of the communication device matches that of the terminal device 1' and the data can be received, the terminal device T stops transmitting the special signal. The communication device that detects the stop of the special signal starts communication at the currently set communication speed. However, with such a communication device, it takes a long time to set the communication speed to the same as that of the terminal device 'r, and the operation becomes complicated.

(dt) Purpose of the Invention The purpose of the present invention is to eliminate the drawbacks of the conventional communication devices as described above, and to make it possible to change the ITI transmission speed in a short period of time without increasing the number of required communication devices and the number of accommodated terminals. It lies in realizing the means.

(el Structure of the Invention This purpose is to set i'+J to any communication speed,
In a start-stop data communication device capable of identifying the logical value of each pin that constitutes data to be received, the logical value of each hint constituting predetermined data received from a connected terminal device is determined in advance. This is achieved by identifying the communication speed and setting the communication speed with the terminal device based on the identification result.

(fl　Embodiments of the invention An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a diagram showing a communication speed setting method according to an embodiment of the present invention, FIG. 3 is a diagram for explaining the operation shown in FIG. 2, and FIG. FIG. 3 is a diagram showing an example of a communication speed table. Note that the same reference numerals refer to the same objects throughout the plan. In FIG. 2, the information processing device HC is connected to the -ζ exchange IEX via a plurality of communication devices CU that can be set to any communication speed. Each communication device CU includes an asynchronous transmitting/receiving circuit UART that can be set to an arbitrary communication speed, and a communication speed table TBL for setting the communication speed S of the asynchronous transmitting/receiving circuit UART. Initially, the communication speed is initially set to S9600 hino 1-7 seconds. On the other hand, it is assumed that the plurality of terminal devices T accommodated in the exchange EX have any of 11 types of communication speeds ranging from 100 bits/second to 9,600 bits/second as shown in FIG. . A terminal device T desiring to communicate with an information processing device HC calls the exchange EX, selects a unique selection number, connects to any communication device CU, and then uses a special predetermined number for communication speed identification. Send data (for example, the number 4 in ASCII code 1). The special data is, for example, as shown in Fig. 4 (
8 bits (8 bits) with start bit ST (logical value 1) and stop bits 1-3P (logical value 0) as shown corresponding to a communication speed of 9600 bits/s in al.
Boolean value 00101101), exchange 11E
It is transmitted via X to the communication device CU. The communication device CU receives the start bit S constituting the received special data.
The logical values of each pin other than T are identified at identification times A to I using the initially set communication speed 5 = 9600 bits/second, and the identification results a to i are expressed in the communication speed table 'BL
to communicate. The communication speed of the connected terminal device T is 960
Identification result a by either 0 bits/sec, 4800 bits/sec, 2400 bits/sec, 1600 bits/sec, 1200 bits/sec, or 600 bits/sec or less
i to i are different from each other as shown in FIG.
BL is composed of a storage device that stores the identification results a to i transmitted from the start-stop transmitter/receiver circuit UART as each address and the corresponding communication speed S, and the communication speed corresponding to the transmitted identification results a to i. S is output and transmitted to the start-stop type transmitter/receiver circuit UART. Start-stop transmitter/receiver circuit UAR
T starts communication with the connected terminal device 1' according to the communication speed S transmitted from the communication speed table i'' T3L.If 600 bits/second or less is output from the communication speed table TBL, , the communication speed table TBL indicates the communication speed S transmitted to the start-stop type transmitting/receiving circuit U A RT by 600 pips.
−7 seconds and connected via exchange EX
11.1 Make the terminal device T return a special signal requesting retransmission of the special data. The terminal device T that has received the special signal retransmits the special data. Start-stop type transmitting/receiving circuit U
AR1' is set communication speed S-600 pino]-7 seconds as shown in Fig. 3 (as shown in bl), and each Hiso l- other than Sfu-I and Pi-I-ST constituting the special data received again. Identification is performed at identification times A to ■, and the identification results a to i are transmitted to the communication speed table TBL.Communication speed table TBL
, the communication speed S is outputted from the IS reply corresponding to the transmitted identification results a to i, and the start-stop type transmitting/receiving circuit U
Communicate to ART. The start-stop type transmitting/receiving circuit UART starts communication with the terminal device 1' at the communication speed S transmitted from the communication speed table TI31-.

As is clear from the following explanation, according to this embodiment, since the information processing device 1-IC is accommodated in the exchange EX by using only one type of communication device CU, the required number of communication devices and the number of accommodated αj11 children are as follows. This can be reduced compared to the case where communication speeds are classified as shown in FIG. In addition, the information processing devices 11c and 1
Since the terminal device 1' desiring ffl transmission only needs to transmit the special data predetermined for communication speed identification two or two times, the time for communication speed identification is shortened and the operation is simplified. .

Note that FIGS. 2 to 4 are only one embodiment of the present invention. For example, special data for identifying communication speed is ASCII.
The I code is not limited to the number 4, and many other variations may be considered, but the effects of the present invention will not change in any case. In addition, each communication device CU has a setting file for any of 11 types of communication speeds from 100 to 9600 seconds.
A first communication device CUa that can be set to any of five communication speeds, for example, from 9600 bits 1-7 seconds to 1200 bits 11/second;
It is divided into two groups: a second communication device CUb that can be set to any of six communication speeds from 600 hits/sec to 100 hits/sec, and each terminal device 'I' is set to the communication speed of its own device. There are many other modifications that can be considered, such as transmitting special data for communication speed identification only once by selectively connecting either configurable communication device CUa or CUb. Even in this case, the effects of the present invention remain the same. In addition, the means for outputting the communication speed S by receiving the identification results a to i of the start-stop type transmitter/receiver circuit U A RT is not limited to the communication speed table i''B L, and many other modifications may be considered. However, in either case, the effects of the present invention remain the same.Furthermore, it goes without saying that the communication speed, which is one aspect of the present invention, is not limited to what is shown in the drawings.

(gl) Effects of the Invention As described above, according to the present invention, it is possible to realize means that can set the communication speed in a short time without increasing the number of required communication devices and the number of terminals accommodated in the exchange.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a conventional communication device, FIG. 2 is a diagram showing a communication speed setting method according to an embodiment of the present invention, and FIG.
The figure is a diagram for explaining the operation shown in FIG. 2, and FIG. 4 is a diagram showing an example of the communication speed table in FIG. 2. In the figure, A to ■ are identification time points, a to i are identification results, CUI to CUn and Ct, J is a communication device, EX is an exchange, IC is an information processing device, S is a communication speed, SP is a stop bit bit, T is the terminal device, TBI is the communication speed table, UAR
T does not indicate an asynchronous transmitter/receiver circuit. Cow 3 Figure 4 Concave

Claims (1)

[Claims] In an asynchronous data communication device that can be set to any communication speed and that can identify the logical value of each bit that makes up the received data, each bit that makes up predetermined data that is received from a connected terminal device. A communication speed setting method characterized in that the logical value of is identified as a predetermined communication speed, and the communication speed with the terminal device is set based on the identification result.