JPS5829537B2 - Tsuushinseigiyosouchiniokeru Cord Hen Kanboshiki - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a code conversion method in a communication control device that controls multiple lines and multiple terminals in a data communication processing system.

Generally, in the data communication processing system shown in FIGS. 1 and 2, the central processing unit 4 executes a program stored in the main storage device 5, and the program is
When desiring data communication with a terminal device 1 connected to one line, the central processing unit 4 issues a channel program (command or set of commands) to the communication control device 2 via the channel control device 3, and controls the communication. The device 2 is designed to execute independently determined functions according to a given channel program.

In this step, the communication control device 2 that controls a large number of terminal devices 1 uses a message buffer (or text buffer).
The main storage device 5 is used as a line buffer for each line.
There were many things that I didn't own that had a buffer of 0 characters.

Conventionally, in this type of communication control device, when performing code conversion, it is necessary to assemble and disassemble characters, check the generation of character parity, detect transmission control codes, check the generation of block check codes, etc. Even when a shift code is not included or a shift code is included, a shift code is usually attached before the block information of the transmission block as shown in Fig. 7a, and according to this shift code. , the code conversion of that block was performed by the method shown in FIG.

That is, in FIG. 4, the character received from the line enters the shift mode switch 12 from the data reception register 11, and when a shift-out character is detected in the shift-in mode and a shift-in character is detected in the shift-out mode, the characters are changed. The shift mode is switched to , this mode is stored in the storage section, and input into the code addressing device 14 on the shift-out side and the code addressing device 13 on the shift-in side, respectively, and the shift code is detected in the shift mode switching device 12. If not, it is entered into the code addresser 13 or 14 according to the current shift mode in the memory.

The code addresser 13 or 14 addresses the codes in the shift-in code conversion table 151 and the shift-out code conversion table 15-2 in the code conversion table 15, respectively.

Furthermore, when a shift code is not necessarily added before the block information of a transmission block, the shift mode at the end of each received transmission block (that is, the shift mode switch 12 stores it).

) as the interrupt status of the channel control device 3.
The central processing unit 4 notifies the central processing unit 4 that the received block should be received in the notified shift mode before issuing a reception command to receive the next block from the same terminal. This problem is solved by notifying the communication control device 2 through the channel control device 3 using the channel program. Although it is effective in that code conversion is sometimes possible, it is necessary to know in advance from which terminal the next transmission block will be received.

However, when it is impossible to know this terminal in advance, for example, when polling is performed by specifying the terminal control device 66n-1 connected to an arbitrary line on the center side as shown in FIG. In the case of any-poling, which takes in a transmission block from any one terminal device 15n-1-m connected to the device 6n-0, the conventional means described above has the disadvantage that code conversion cannot be performed.

In view of the above-mentioned drawbacks of the conventional art, the present invention provides that transmission blocks from a large number of terminal devices that handle shift codes on a single line connected to a communication control device are not necessarily given a shift code before the block information. However, if these transmission blocks are received in a mixed manner, one transmission text from the same terminal device is sent divided into several transmission blocks, and these blocks are sent consecutively. In order to enable code conversion in this type of device, in cases where the transmission block of another terminal device interrupts these transmission blocks and is received by the communication control device. The communication control device is equipped with a storage unit that controls the shift mode in accordance with the character specified at the beginning of the block that specifies the terminal device, and the shift mode between transmission blocks is organically controlled. , which attempts to provide a new method that can easily handle a large number of lines at the same time and perform code conversion, in which a receive transmission block is started by either shift-in or shift-out shift mode. In a communication control device that controls a transmission method that is not necessarily specified at the beginning of the reception transmission block, a communication control device that controls a transmission method that is not necessarily specified at the beginning of the reception transmission block, corresponds to the terminal device specified by the character preceding the block in the reception transmission block, a storage unit that updates a shift mode with a shift character immediately before the end character of the received transmission block received every several blocks constituting the text, and stores this shift mode; and a character that specifies the terminal device. and means for reading out the corresponding storage unit, and each time the information character is received, code conversion is performed according to the stored shift mode. .

The code conversion method according to the present invention will be explained in detail below.

First, let's talk about the general code conversion method in this invention.
Referring to the figure, as shown in FIG. A large number of terminal devices 1 611 to each of □ to 6n
m, .
6n- each have a terminal device specification character UAm, and when data flows from the terminal device 11-6n to the terminal control device 6n to the communication control device 2, when SAn and then UAm enter the device 2 as data, the above-mentioned 5, first, SAn is received in the data reception register 11, and the shift mode table 19n corresponding to SAn, which forms part of the address and is registered in advance in the base address table 16 of the shift mode table. The base address An specifying is read out and stored in the shift mode bit addresser 18, and then the UAm received in the data reception register 1 is directly stored in the addresser 18.

In addition, in the line number register 7, the line number LNl is stored in advance before importing these An and UAm.
When An and UAm are stored in the addresser 18, the gate of the line number register 7 is opened and the L Nl and An are stored.
, UAm in the addresser 18, the corresponding shift mode table 1
The position of the shift mode bit corresponding to the terminal SAn, UAm of the line LNl in 9n can be addressed, and this shift mode bit can be updated and read out at high speed.

Therefore, the base address table 16 to shift mode table 19tn are set to the SA shown in FIG.
, UA-, and is a replacement for the shift mode switch 12, which is controlled only by the Tama shift code.

The thickness of the shift mode table 19tn generally has the number of registered combinations determined by the maximum number of UA- code units, and the configuration of one registration is determined by the number of lines.

Next, an embodiment of the code conversion method according to the present invention will be described with reference to FIG.

The example shown in FIG. 6 has the configuration of the data communication processing system shown in FIG. , 6□, and a maximum of three terminal devices 1 611 to 3, 1-6□-1 to 2 are connected to the terminal control devices 61 and 6□, and as shown in FIG. 7c. Assume that the center is receiving and receiving transmission blocks from each terminal device by uni-poling.

If the SA UA- code is 7 units (8 units including parity), in FIG. 6, 111 is 1 byte (1 byte is an 8-bit storage unit,
(same below) data reception registers, 113 and 114
115 and 1152 are code addressers on the shift-in side and shift-out side, respectively; 115 and 1152 are code conversion tables on the shift-in side and shift-out side, respectively;
6 is the base address table of the shift mode table of 127 bytes x 1 byte, 117 is the line number register,
118 is a shift mode bit addresser; 11
91 to 3 are 127 bytes x 2 bytes (2 bytes is 16
This is the shift mode table (meaning that the line can be controlled).

In the above configuration, as shown in FIG. 7b, the 5AI (terminal control device 61) of the line LNl is polled, and the S input 1. UAL (terminal device 1-6□-1
) is received in shift-in mode, and this mode is the corresponding shift mode table 1 of FIG.
191.

Next, 5A2 (terminal control device 62) of the same line is polled, and SA2, UA3 (terminal device l-62-
3) the transmission block is received in shift-out mode;
This mode is stored in the corresponding bit in the corresponding shift mode table 1192.

Finally, the SA1 of the same line is polled, and the S
AI and UAI receive the last transmission block of text, but this block information is not preceded by a shift code, but this block has the shift mode of the block of the first SA, tUAI, In other words, you need to receive it in shift-in mode.

This is done by reading out and determining the shift bit in the corresponding shift mode table 1191.
It is easy to know that the shift-in mode is in effect, and after that, code conversion is executed by the code conversion table 115 via the code addresser 113 in this shift mode.

As described in detail above, in a data communication processing system in which multiple lines and multiple terminals are connected to a communication control device, when unipoling is executed, a shift mode control logic is configured in the communication control device. This determines what kind of SA the arbitrary line connected to this communication control device is.

It is not known in advance whether a transmission block will be received from a terminal device with UA-, and the terminal device with UA-SA.

It is extremely effective for code conversion when the shift mode control of shift-in and shift-out is organically related between transmission blocks from a terminal device with UA-, and the shift mode control is Since the UA- code or line number serves as the address of the storage section where the shift mode is stored and read, the storage,
The reading process is quick and does not reduce the processing capacity of the communication control device as a preprocessing for indexing the conventional code conversion table, especially when dealing with multiple lines and multiple terminals. It is extremely effective.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional general data communication processing system, and FIG. 2 is a block diagram showing a data communication processing system connected with multiple lines and multiple terminals, which is particularly effective in relation to the present invention. , FIG. 3 is a block diagram showing a data communication processing system related to an embodiment of the present invention, FIG. 4 is a block diagram showing general code conversion in a conventional communication control device, and FIG. 5 is a block diagram showing a data communication processing system related to an embodiment of the present invention. FIG. 6 is a block diagram showing code conversion according to a specific embodiment of the same, and FIG. 7a is a block diagram showing code conversion according to one embodiment. FIG. FIG. 77b, an explanatory diagram showing a certain transmission block, is an explanatory diagram showing an any-poling transmission control procedure related to the present invention. 1.1-...Terminal device, 2...Communication control device, 3...Channel control device, 4...
...Central processing unit, 5...Main storage device, 6,6
-...Terminal control device, 11.111...
・Data reception register, 13°113 and 14,11
4... Code addresser on shift-in and shift-out side, 15°15t and 1151,1
152 and 1152... Code conversion table on shift-in and shift-out side, 16, 116...
...Base address table of shift mode table, 17,117...Line number register, 18
, 118... Addresser for shift mode bits, 191-n, 1191-3... Shift mode table.

Claims (1)

[Claims] 1. In a communication control device that controls a transmission method that is not necessarily specified at the beginning of the reception transmission block, in which the reception transmission block is started by either shift mode, shift-in or shift-out,
The shift mode is updated by the shift character immediately before the end character of the received transmission block, which is received every several blocks and corresponds to the terminal device specified by the character preceding the block and constitutes the text related to the same terminal device. identify a storage unit that stores this shift mode and a character that specifies the terminal device;
A code conversion method, comprising means for reading out the storage section corresponding thereto, and performing code conversion according to the stored shift mode each time the information character is received.