JPS6347384B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a transmitting teletype and at least one
two receiving teletypes are adjustable to a first and second mode of operation, or at least one receiving teletype is operable in only one mode of operation and the transmitting and receiving teletypes are adjustable. The present invention relates to a method for adjusting a teletype to a different operating mode, such that after connection a predetermined character string is transmitted for adjusting to a first operating mode, and to a device implementing this method.

For teletypes that can operate by selecting one of two operating methods, for example, one with different transmission speeds, after connecting the transmitting and receiving teletypes and exchanging beacon signals, the transmitting teletype It is known to transmit a predetermined character string from a type to a receiving teletype, thereby adjusting the receiving teletype to a mode of operation with a high transmission rate.
In this case, it is assumed that the transmitting teletype has confirmed that the receiving teletype can operate at high transmission speeds. To confirm this, before starting the actual transmission, the indicator signals are exchanged once more, already from this point on at a high transmission rate. In this known method, if the receiving teletype is not configured to operate at a high transmission rate, an operating mode with a lower transmission rate is not automatically switched on.

The basic problem of the invention is to provide a method with which a teletype can be adjusted to the appropriate one of two modes of operation. According to the invention, this problem is solved by the features recited in claim 1.

The method according to the invention allows a transmitting teletype capable of operating in two modes of operation to be shared with a receiving teletype also capable of operating in two modes of operation, such that each is used in the optimum mode of operation. It has the advantage of being able to work. Furthermore, it is also possible to co-operate the sending teletype with a teletype that is available in only one mode of operation. In all cases the switching takes place automatically.

The further character string returned from the receiving teletype is examined as follows. That is, only the first character is checked, so that the predetermined character string does not appear during the transmission of the text and is therefore not erroneously adjusted to another mode of operation. Another string check is also performed within a predetermined period. This method can be advantageously used, for example, in the following cases: That is, a teletype is provided for the transmission of coded Korean characters, with the associated code being transmitted in the "intercharacter space" after each syllabic character in the first or second mode of operation; In some cases, the data may not be transmitted.

It is advantageous to use the characters AAAA or BBBB as the character string or further character string for switching.

A particular embodiment of the apparatus for carrying out the method according to the invention is constructed as follows. That is, a control device installed in the teletype has a memory and a comparator, in which a character string and another character string are stored, and a character string received by the comparator is stored. is compared with the specified string. The switch stage additionally has a counter and a further memory connected to the counter, which counts the first received character, in which the received character string is temporarily stored. Advantageously, the memory, comparator and counter are components of a microcomputer.

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

In the equipment shown in Figure 1, the three teletypes F1 to F3 are connected to the switching center via long-distance lines FL.
Connected to VS. Teletypes F1 and F2 are state-of-the-art and can operate in two operating modes B1 and B2. On the other hand, the Teletype F3 is an old-fashioned device and operates only in one operating system B2.

Teletypes F1-F3 are used, for example, to transmit coded Korean characters. In older teletypes, the end of a syllabic character in text written in Korean characters is detected by "intercharacter spacing." Therefore, when transmitting text from teletype F1 to F3, teletype F1 must be adjusted to operating mode B2 in order to print syllabic characters accurately. In state-of-the-art teletypes, the end of a syllabic letter is automatically detected and "letter spacing" between syllabic letters is unnecessary. Thus, when transmitting texts from teletype F1 to teletype F2, the two teletypes can be adjusted to operating mode B1. In operation method B1, "intercharacter spaces" between syllable characters are not transmitted. Adjustment to operation method B1 is performed as follows. That is, Teletype F1 and Teletype F2.
After connecting and exchanging identification signals, Teletype F
1 transmits a predetermined character string, for example, AAAA. If the teletype F2 only operates in mode B2, this string is only transmitted. If the teletype F2 is capable of operating in two modes of operation, then upon receiving the above-mentioned character string, the teletype F2 sends back another character string, for example BBBB, to the teletype F1. At the same time, the teletype F2 is adjusted to the operating mode B1. When the teletype F1 also receives the returned character string, it is likewise adjusted to the operating mode B1, so that the text is transmitted using the operating mode B1.

The above process will be explained in detail with reference to FIG.

The teletype shown in the block circuit diagram of FIG. 2 is based on one of the known teletypes. This teletype has a keyboard TA, a perforated tape reader LL, a receiver EM connected to a long-distance line as input devices, and a printing mechanism DR as output devices.
It has a perforated tape punch LS and a transmitter SE connected to a long distance line. The teletype further has a control device ST for controlling the functional operation of the teletype. The control device ST additionally has a switch stage SS and switches SW1, SW2, which is provided with memories S1 to S3, comparators V1, V2 and a counter Z. Memory S, comparator V and counter Z may be configured as a microcomputer.

If this teletype acts as a transmitting teletype, after the connection with the receiving teletype has ended and indicator signals have been exchanged, the character string AAAA stored in memory S1 is transmitted via the transmitter SE and the long distance line FL. and transmitted to the receiving teletype. If the receiving teletype is capable of operating in both operating systems B1 and B2, it also has the same configuration as the illustrated teletype. The received character string is counted by a counter Z and temporarily stored in the memory 2. Comparator 1 compares the temporarily stored character string with the character string stored in memory 1, and if the two are the same, adjusts the receiving teletype to operating mode B1. This operation is performed by the illustrated switch SW1.
Comparator V1 also sends a signal to memory S3. A further character string BBBB is stored in the memory S3 and is transmitted via the transmitter SE to the transmitting teletype. The first character string transmitted by the receiver is in the sender's teletype.
It is counted by counter Z and stored in memory S2. A comparator V2 compares the stored contents of the memory S2 with the stored contents of the memory S3, and if they are the same, the transmitting teletype is adjusted to the first operating mode B1 by means of a switch SW2. After this, the characters will be transmitted according to the mode of operation B1.

If the receiving teletype can only operate in operation mode B2, the receiving teletype does not return the above-mentioned different character string BBBB. In this case, the receiving teletype first arrives and the memory S2
The character stored in V2 generates a negative comparison result at the output of comparator V2. Therefore the switch
SW2 is not switched, and the transmitting teletype remains adjusted to operation method B2.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the connection relationship of three teletypes connected to a switching center VS, and FIG. 2 is a block circuit diagram of a switch stage provided in the control device of the teletype. B1, B2...Operating system, F1-F3...Teletype, VS...Switching office, FL...Long distance line,
EM...Receiver, TA...Keyboard, LL...Perforated tape reader, ST...Control device, SS...Switch stage, Z...Counter, S1 to S3...Memory, V1, V2...Comparator , SW1, SW2...
Switch, SE...transmitter, DR...printing mechanism,
LS...Perforated tape/punch.

Claims (1)

Claims: 1. The transmitting teletype and at least one receiving teletype are adjustable to first and second modes of operation, or the at least one receiving teletype is adjustable to only one mode of operation. A method of adjusting a teletype to a different operating mode by transmitting a predetermined string of characters to adjust to the first operating mode after connecting the sending and receiving teletypes. , the second teletype F2 is 2
If it is possible to adjust to two operation methods B1 and B2, the second
The teletype F2 of is adjusted to the first operating mode B1, and the receiving teletype F2 is adjusted to the transmitting teletype F2.
1, another predetermined character string by which the transmitting teletype is adjusted to the first operating mode B1, and the receiving teletype F3 only operates in one operating mode B2. adjusting the teletype to a different mode of operation, characterized in that, in the case of adjusting the teletype to a different mode of operation, said further character string is not transmitted to the sending side teletype F1, so that the sending side teletype F1 is adjusted to a second mode of operation; Method. 2. Claim 1, in which the first received code or character of the teletypes F1, F2 operable in the two operating modes B1, B2 is compared and tested on the basis of a predetermined code or character string. The method described in section. 3. Codes received within a predetermined time among the teletypes F1 and F2 that can operate in two operating modes B1 and B2 are compared and examined based on a predetermined code string. Or the method described in Section 2. 4 First or second operation method (B1 or B
2) is used in a coded transmission system for Korean characters, in which a code word corresponding to an "intercharacter space" is transmitted after each syllable. Method described in Crab. 5 First or second operation method (B1 or B
2) is used in a transmission method in which Korean characters are coded, and in this transmission method, a code word corresponding to an "intercharacter space" is not transmitted after each syllable. Method described in Crab. 6. The method according to any one of claims 1 to 5, wherein AAAA is used as the predetermined character string and BBBB is used as the other character string. 7. The transmitting teletype and the at least one receiving teletype are adjustable to a first and second mode of operation, or the at least one receiving teletype is operative in only one mode of operation; In a device for adjusting teletypes to different operating modes by transmitting a predetermined string of characters to adjust to a first operating mode after the transmitting and receiving teletypes are connected, the known teletype has a switch stage SS, which is provided with memories S1, S3 and comparators V1, V2 for a predetermined character string, and these comparators V1, V2 convert the received character string into the memory S1. , is compared with the character string stored in S3, and when a positive comparison result is obtained,
A device for adjusting a teletype to a different operation mode, characterized in that the teletype is adjusted to a first operation mode B1. 8. A patent claim in which the switch stage SS has a counter Z, and the counter Z counts a predetermined number of characters whose number corresponds to a predetermined character string, and sends the corresponding number of characters to the temporary storage memory S2. The device according to item 7. 9 Switch stage SS is microcomputer MR
Claim 7 or 8 formed from
Apparatus described in section.