JPH0244847A - Terminal connection system - Google Patents

Abstract

PURPOSE:To reduce a rate when a system becomes busy by connecting a terminal having various and different transmission codes to plural telephone lines having one representative telephone number. CONSTITUTION:With realizing that three kinds of codes come to be the common codes only by readjusting a part of the codes, respective terminals transmit terminal types to a host by using the common codes. Namely, one representative telephone number can be given to ten telephone lines connected to a host computer 1. Since use code identification information is transmitted from a terminal 7 by the common codes, the call can be terminated to any line 2. It is not solidly decided to which line a call is made from which terminal. Thus, the rate that the system becomes busy is reduced and the telephone line can efficiently be used.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a terminal connection method, and in particular, a method for connecting a large-sized computer and a plurality of terminals such as personal computers through a telephone network. The present invention relates to a terminal connection method suitable when each terminal transmits a different code.

[Conventional technology]

Conventionally, the methods of using subscriber switched telephone networks for data transmission include (a) connecting a computer, etc. to a modem (modulator/demodulator);
(2) A method of communicating with other terminals by switching between the telephone and data terminal equipment alternately using a converter (first, the telephone dial the other party, and after connecting with the other party, switch the converter from the telephone to the data terminal) and (
c) There is a method of connecting a data terminal device to a handset of a telephone via an acoustic coupling device to perform data communication.

In particular, the connection method using an acoustic coupling device (c) above is widely used as a simple communication method, although data communication can be performed from anywhere as long as there is a telephone, although high-quality communication cannot be achieved. In this connection method using an acoustic coupling device, start-stop type terminals are connected and transmission and reception are performed using start-stop codes. The start/stop code consists of a start signal (binary symbol 0) and a stop signal (
These are characters and control codes surrounded by binary symbols 1).

As a conventional connection method for start-stop type terminals, for example, NTT
It is described in the technical reference material ``Packet Switching Service Interface (NPT Edition)'', pp. 15-18.

As shown in the above document, in conventional start-stop terminals, when a terminal joins a communication system, it specifies the transmission code to be used. Usually, the transmission codes used are (a) ASCII code and (b) J
There are IS 7 unit codes and (c) JIS 8 unit codes.

A S CI I (American Standard)
ard Code forInformation
nIinterchange) code is an American standard and is often used in personal computers. This code is obtained by adding one parity bit to seven bits from the first bit (2'bit) to the seventh bit (2'bit). For example, the sign of A is (1000001) and the sign of B is (1000
010), and the code of C is (1000011).

Next, the JIS 7 unit code is the 7 unit code for Roman characters,
There are three types: 7-unit code for katakana and 7-unit code for Roman characters and katakana. Among these, the Roman alphabet/Katakana code uses the functional characters SI and SO to determine whether it is regarded as Roman alphabet or Katakana. SI precedes the character and uses the Roman character until the next SO appears. Also, SO precedes and katakana characters are used until the next SI appears.

This code is also from the 1st bit (2'bit) to the 7th bit.
This is the sum of 7 bits (up to 21 bits) and 1 parity bit. For example, the sign of A is (1
000001), and the sign of B is (1000010)
, the sign of C is (1000011), and AS
It is exactly the same as the CII code. The only difference is that a katakana code is added.

Next, unlike the above-mentioned 7-unit code, the JIS 8-unit code assigns Roman letters and katakana to separate codes. However, from the 1st bit (28 bit) to the 8th bit h (21
bit), but if the first bit is 0, it is a Roman alphabet, and the first bit] is 1.
If the case is katakana and the first bit is removed, J
It is exactly the same as the IS7 unit code. For example, the code of A is (01000001) and the code of B is (01000
010), and the code of C is (01000011,).

[Problem to be solved by the invention]

As mentioned above, in the conventional connection method using an acoustic coupling device, the communication system had to provide separate telephone lines for each different transmission code for a plurality of terminals. In other words, 3 terminals use ASCII code, 5 terminals use JIS 7 unit code, and 5 terminals use JIS 7 unit code.
When 8 terminals use 8 unit codes, 16 lines are divided into 3 lines for ASCII codes, 5 lines for JIS 7 unit codes, and 8 lines for JIS 8 unit codes. Since the transmission code is specified when a terminal joins, it is necessary to allocate lines accordingly, but if terminals that join in the middle are heavily weighted towards one code, allocation becomes difficult.

Therefore, the usage efficiency of telephone lines has decreased, and the proportion of lines that are unusable, that is, is busy, has increased.

As described above, in the conventional technology, it has not been possible to connect terminals having different transmission codes to the same telephone line, but no attempt has been made to make this possible.

An object of the present invention is to solve these conventional problems and to provide a terminal connection that allows start-stop terminals with different transmission codes to connect to the same line, thereby making it possible to use the telephone line efficiently. The goal is to provide a method.

[Means to solve the problem]

In order to achieve the above object, the terminal connection method of the present invention connects a host computer and a plurality of start-stop non-procedural terminals that use a code consisting of 7 bits + parity bits and a code consisting of 8 bits without parity. In a communication system connected via a telephone network, the host computer is provided with a memory that stores a table that defines the usage code of the terminal, and after the terminal makes a call to the host computer, the terminal makes a call to the host computer. , the host computer sends usage code identification information consisting of a predetermined code, and upon receiving the usage code identification information, converts the 28 bits of each character of the usage code identification information described in - to (0)2. After editing, the terminal usage code definition table stored in the memory is searched to obtain the usage code of the terminal, and after determining the usage code, the host I to the computer uses the code determined.
It is characterized by communication between the f-calculator and the terminal. Further, if the terminal sends the usage identification information to the host I to the computer and the host computer cannot search the usage code of the terminal from the terminal usage code definition table using the usage code identification information, the host computer 1. Another feature is that an error message is constructed using only the character code from which the parity bit in the J87 unit code has been removed, and the error message is sent to the terminal. Furthermore, when the computer side of the host 1 is connected to the telephone network through a plurality of subscriber lines and communicates with a plurality of terminals using different codes from each other via the telephone network, one Either set a representative address, or allocate some lines of the multiple subscriber lines mentioned above for communication with terminals with specific codes, and set one representative 71~response for the remaining lines. It also has its own characteristics.

[For production]

In the present invention, the shift h-in side of the JIS7 unit code,
In other words, the character for which the code is input and the character whose first bit (2" bit) of the JIS 8 unit code is (0)2 are exactly the same, if you ignore the first pip 1- (211 bit) above. We are focusing on this.

In other words, the ASCII code and the JIS7 unit code are the same, and these codes and the JIS8 unit code are the same as the JIS7 unit code.
If the [th]-p1- of the S8 unit code is removed, all three become the same. In this way, by using three types of codes in common, after connecting terminals that use different types of codes to the same line, this common code can be used to determine the true code used and the specified Subsequent communication is performed using the code. As mentioned above, these three types of codes contain alpha heads (uppercase and lowercase letters), numbers, and other symbols, so these symbols can be used to identify the attributes of the terminal, that is, the terminal It is possible to notify the host l- (system side) of the code to be executed.

Among the shift-in characters of the J-87 unit code, a message consisting only of characters with a parity pitch of 1- or (0)2 can be output as an ASCII code by setting each character's 211b]t to (0)2 and outputting it to the terminal. , JI87 unit code and JIS8 unit code, it can be displayed correctly on any terminal, so there will be no malfunction.

The procedure of the present invention is that, first, when a terminal and a telephone line are connected, the shift-in side sends the code identification information of the ASCI I code and JIS 7 unit code to the host computer, and in the case of a JIS 8 unit code, the first bit (2”b
it) sends the code identification information to be used from the shift-in side to the host computer using the code (0)2. Here, the usage code identification information is predetermined by the system. for example,
Terminals that specify JIS7 unit code are 'A' and J.
Terminals that specify IS8 unit code are l B l,
A terminal whose designated code is an ASCII code is designated as 10'. On the host side, 211 bits of each character of the received identification information are set to (0)2, read as a JIS8 unit code, and the code to be used is determined from the contents. In other words, the ASCII code and the 2' bit of the T I87 unit code are even parity bits and are (0)2 if there is no error, and the 211 bit of the JIS 8 unit code is
If is set to (0)2, the codes of the three parties will be common. Then, if the identification information of the host computer is A, B, or C, the host computer uses JIS 7° and JIS 8. It is determined that each code is an ASCII code. In this way, the code to be used is determined for each terminal, and from then on, communication is performed using the code to be used. Also, when the code to be used cannot be determined due to an input error by the operator, for example, the code identification information to be used is A.

If there are only three types, B and C, but D is sent due to an operator's key operation error, the host side will send the message to the terminal side. In other words, the parity bit (even parity) of the shift-in side characters of the JIS 7 unit code is (0).
Error messages consisting only of characters that are 2 (for example,
'error! ') to the terminal and waits for the code identification information to be input again. This will ensure that the correct usage code is entered.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a schematic diagram of a communication system to which the present invention is applied.

In FIG. 2, the communication system uses a connection method using an acoustic coupling device, and a host computer 1, which communicates with a plurality of terminals using different codes, is connected to a modem 3 and an NCU (network control unit). It is connected to a telephone network 5 by a plurality of telephone lines 2 via 4. On the other hand, a start-stop non-procedure terminal (hereinafter simply referred to as a terminal) 7 is connected to a plurality of telephones 6 accommodated in the telephone network 5 via a modem 3, respectively. As the start-stop type non-procedure terminal 7, a personal computer or the like is normally used.

In the conventional system, these terminals 7 communicate using one of three types of codes as a designated code, so the telephone line 2 on the host computer 1 side is also divided into three types. For example, if the telephone line 2 connected to the host computer 1 is
If there are 0 lines, assuming that JIS7 unit codes, JIS8 unit codes, and ASCII codes are used at a ratio of 5:3:2, communication requests have arrived from many terminals for a small number of lines. At times, the busy rate increases. Additionally, traditionally, on the host side,
It is impossible to have one representative number for all 10 lines, and it is necessary to have a representative number for each of the three types of lines.

In contrast, in this embodiment, ten telephone lines connected to the host computer 1 can have one representative telephone number. In this embodiment, since the used code identification information is first transmitted from the terminal 7 using a common code, the call can be received on any line 2, and therefore, it is not fixed which terminal receives the call on which line. It will not be decided. As a result, the proportion of busy calls is reduced, allowing efficient use of telephone lines.

FIG. 1 is a sequence chart 1 of a communication procedure and a host computer processing procedure showing an embodiment of the present invention, and FIG. 3 is a diagram of a terminal type definition table stored in the host computer.

First, when a call is received from a certain terminal 7 to the host computer 1 (step 11), the host computer 1 responds by calling
- response (step 12). Next, when some key is input from the terminal 7 (step 13), the host l-
From the computer code, JIS7, JIS8, and A, 5
'CR'''L F' B E L', which are characters that can be output to a terminal that handles any CII code, is output (step 14).The ASCI I code for 'CR' is (○OO1101, ), the J Engineering 87 unit code is (000], 101.), and the JIS 8 unit code is (
00001101), therefore, if the first -pill~ is removed only in the case of the JIS8 unit code, the three types will become a common code I. Also, the ASCI I code of 'LF'BEL' is (0001010) (00001↓1) respectively.
and the JIS7 unit code is (0001010
)(0000111), and the JIS 8 unit codes are (00001010) and (00000111), respectively, so if the first pick l- of the JIS 88 unit code is removed, it becomes common to the three types of code 1.

Next, when the terminal 7 inputs the 'terminal type', that is, the identification information l A I I B I ' CI to the code 1 used (step 15), the host 1-computer 1 starts the processing routine. First, the usage code of the terminal 7 is determined by searching the terminal tape definition table 22 shown in FIG. 3 (step 16). For example, if the terminal type is 'A', use code JIS7 as an attribute.
is output. If the terminal type entered from terminal 7 is not found in table 22 (step 17), an error message 'SI'e is sent to terminal 7.
Output rror'LF''CR' (step 19)
.

In addition, when transmitting characters, the necessary control code is sent back and forth and the character code is transmitted, which allows both receiving functions to operate effectively. Also, when outputting error messages, please use the JIS 8 unit code 2.
11blt is sent as (○)2. As a result, this message can be output in the correct code to the terminal 7 that uses any of the JIS7 unit code, JIS8 unit code, and ASCII code I~. As a result, the terminal type (used code identification information) is sent from the terminal 7 again.

Once the usage code for the terminal 7 is determined (step 17), a business start message is constructed from the determined code and output to the terminal 7 (step 20.21). That is, if the terminal type is A, the business start message is configured using JIS7 unit code, if it is B, it is configured using JIS8 unit code, and if it is C, it is configured using ASCII code 1-, and then sent to the terminal 7. Output.

In this way, in this embodiment, we focused on the fact that a common code can be obtained by only partially modifying three types of codes, and each terminal uses this common code to send the terminal type to the host. There is no need to allocate the line to be used depending on the type of code, and any line can be used. Therefore, one representative telephone number can be defined for all lines. Note that, if necessary, it is also possible to allocate only some lines to the three types and give the remaining lines a representative telephone number. For example, it is also possible to allocate only two emergency lines based on JIS 7 unit codes and allocate representative@new numbers to the remaining lines so that normal communication can be carried out.

〔Effect of the invention〕

As explained above, according to the present invention, terminals with various different transmission codes can be connected to multiple telephone lines having one representative telephone number, so the busy rate is reduced. , it becomes possible to use telephone lines efficiently.

[Brief explanation of the drawing]

Fig. 1 is a sequence chart h of communication procedures between a host computer and a terminal and processing procedures of the host computer showing an embodiment of the present invention, Fig. 2 is a block diagram of a communication system to which the present invention is applied, and Fig. 3 is a diagram of a terminal type definition table stored in the memory within the host computer. 1: Post computer, 2: Telephone line, 3: Model 11.4
: NCU (Network Control Unit), 5: Telephone network, 6: Telephone,
7: Terminal (start-stop type non-procedural terminal), 22: Terminal type definition table.

Claims (1)

[Claims] 1. A host computer and a plurality of start-stop non-procedural terminals using a code consisting of 7 bits + parity bits and a code consisting of 8 bits without parity are connected via a telephone network. In the communication system, the host computer is provided with a memory that stores a table that defines the usage code of the terminal, and after the terminal makes a call to the host computer,
The terminal sends usage code identification information consisting of a predetermined code to the host computer, and upon receiving the usage code identification information, the host computer converts the 2^8 bits of each character of the usage code identification information into (0 )_2, search the terminal usage code definition table stored in the memory above to find the usage code of the terminal, and after determining the usage code, use the code determined by the host computer to communicate with the host computer. A terminal connection method characterized by communication between the terminals. 2. If the terminal sends the usage code identification information to the host computer and the host computer cannot search the usage code of the terminal from the terminal usage code definition table using the usage code identification information, the host computer 2. The terminal connection system according to claim 1, wherein an error message is configured using only character codes with parity bits removed, and the error message is sent to the terminal. 3. When the host computer side is connected to the telephone network through a plurality of subscriber lines and communicates with a plurality of terminals using mutually different codes via the telephone network, one representative address is provided to the plurality of subscriber lines. A patent claim characterized in that a part of the multiple subscriber lines is allocated for communication with a terminal with a specific code, and one representative address is set for the remaining lines. Terminal connection method according to scope 1 or 2.