JPS61242142A - Communication control system - Google Patents

Abstract

PURPOSE:To attain the communication among plural types of terminals of different characters of calling frame synchronizing signals, by executing the transmission control procedure corresponding to a synchronizing character pattern when the coincidence is secured between said character pattern and a bit pattern sent from a communication circuit. CONSTITUTION:Registers 1-1-1-n hold different character patterns, and the contents of these registers are compared with the output of a shift register 2 which converts the serial bit data sent from a communication circuit 7 into the parallel bit data through a synchronizing pattern comparison detecting part 3. When the part 3 obtains the coincidence between the output of the register 2 and the contents of a certain register 1-i, a processing part 6 executes a transmission control procedure 4-i corresponding to the synchronizing character pattern held by the register 1-i. This secures a flexible countermeasure to the incoming calls arriving a synchronously just with a single circuit.

Description

[Detailed Description of the Invention] [Summary] A plurality of synchronization character patterns are held and compared with a bit pattern sent from a communication line, and when a match is found, a transmission control procedure corresponding to the synchronization character pattern is performed. A configuration is shown that runs the .

[Industrial application field]

The present invention relates to a communication control system, and in particular, a communication control system that is connected to a communication line, establishes a synchronization operation by detecting a synchronization character sent from the communication line, and then shifts to control of a predetermined transmission control procedure. It relates to a communication control method in a device.

[Conventional technology]

In conventional synchronous serial data transmission using communication lines, communication is performed using one type of transmission control procedure per line. This method uses a method in which the 5YNC character used for synchronization on the sending and receiving sides differs depending on the transmission control procedure, but only one type of 5YNC character is set on the receiving side and synchronization is thereby established. This is because of this.

[Problem that the invention seeks to solve]

Therefore, it is necessary to fixedly limit the transmission control procedure used in one line to one type or several common types of 5YNC characters, or to set the line to be used to one specific transmission control procedure in advance before communication. was necessary.

This means that many types of terminals/terminals can be connected to one line, such as a k-switched line.
In a communication system in which a host may be connected by conversion, a problem arises in that the terminals/hosts to be connected are limited.

[Means for solving problems]

FIG. 1 is a diagram showing the principle of the present invention, and in the figure, 1-1 to 1-
n is a register, 2 is a shift register, 3 is a synchronization pattern comparison and detection section, 4-1 to 4-n are various transmission control procedures, 5 is a memory, 6 is a processing section, and 7 is a communication line.

Registers 1-1 to 1-n hold different synchronization character patterns, and their contents are transmitted from the communication line (output of shift register 2 which converts serial bit data into parallel bit data and outputs it). are compared in the synchronization pattern comparison and detection section 3. When the output of the shift register 2 and the contents of one of the registers 1-i match in the synchronization pattern comparison and detection section 3, the processing section 6 Transmission control procedure 4-i corresponding to the synchronization character pattern held in -i is executed.

[Effect]

The present invention has means for establishing synchronization using any of a plurality of types of 5YNC characters, and the 5YNC characters that have been synchronized
Communication control is performed using a transmission control procedure corresponding to the YNC character, and this allows, for example, communication between multiple types of terminals/hosts with different 5YNC characters incoming calls via a switched line. becomes possible.

〔Example〕

FIG. 2 is a block diagram of a communication control device according to an embodiment of the present invention, in which 10 is a microprocessor (MPU).
, 11 is memory, 12 is synchronization establishment display register, 13
-1 to 13-n are synchronization pattern setting registers, 14-1
14-n is a comparator, 15 is a shift register, 16 is a bit sampling section, 17 is a synchronization establishment timing control section, 18 is a communication LSI, 19 is a received data (line) and a received clock signal (line), 20 is external synchronization signal (line)
, 21 is a reset signal (line), 22 is a reception wait/each procedure transition processing unit, 23-1.23-2. ---
--- is a transmission control procedure processing unit.

The operation is as follows.

The received data is sampled by the reception clock signal in the bit sampling section 16 and sequentially input in series to the shift register 15. On the other hand, the parallel outputs of the shift register 15 are compared with the synchronization pattern setting registers 13-1 to 13-n by comparators 14-1 to 14-n. If the comparison results in a match with the contents of any register 13-1, the comparator 14-1 sends a match signal to the synchronization establishment timing control section 17. The synchronization establishment timing control unit 17 displays on the synchronization establishment display register 12 which register's contents match the match. in this case,
The synchronization establishment display register 12 displays that there is a match in the register 13-i.

Further, the synchronization establishment timing control unit 17 creates a synchronization clock (for example, 8 bit time) for each character based on the coincidence signal from the comparator 14-1, and sends it as an external synchronization signal 20 to the communication LS 11B. This establishes subsequent character synchronization.

On the other hand, by reading the contents of the synchronization establishment display register 12, the microprocessor 10 identifies that synchronization has been established with any of the 5YNC characters, and shifts to controlling the transmission control procedure that corresponds to the type of the 5YNC character. .

Thereafter, communication control is executed based on that procedure. Note that the read operation of the synchronization establishment display register 12 and the transition processing operation to the transmission control procedure processing section 23-1 are performed by the reception wait/each procedure transition processing section 22.

As is clear from FIG. 2, in the embodiment, in order to reduce the load on the microprocessor 10, the communication LS 11
A configuration using 8 is adopted.

As described above, the communication LS 118 operates based on an external synchronization signal from the synchronization establishment timing control section 17.

At the time of reception (waiting for a call), the microprocessor 10 resets the synchronization establishment (coincidence signal) in the synchronization establishment timing control section 17 using the reset signal 21, and sets the 5YNC character expected to be received to the synchronization pattern setting register 13. -1 to 13-n and waits for the match signal to rise.

As described above, when the coincidence signal is raised, control is transferred to the corresponding procedure depending on the type of 5YNC character, and thereafter communication control operations are performed in the same manner as normal (conventional).

〔Effect of the invention〕

According to the present invention, for example, in a communication control device that uses a switched line to communicate with terminals/host stations using a plurality of different transmission control procedures, it is possible to flexibly respond to incoming calls that arrive asynchronously on one line. It is now possible to do so, and the effects are extremely large.

[Brief explanation of drawings]

FIG. 1 is a principle diagram of the present invention, and FIG. 2 is a block diagram of a communication control device according to an embodiment of the present invention. In FIG. 2, 10 is a microprocessor, 11 is a memory, 12 is a synchronization establishment display register, and 13-1 to 13-
n is a synchronization pattern setting register, 14-1 to 14-n are comparators, 15 is a shift register, 17 is a synchronization establishment timing control section, 23-1.23-2. ----- are transmission control procedure processing units.

Claims (1)

[Scope of Claims] A communication control device that is connected to a communication line, establishes synchronization by detecting a synchronization character sent from the communication line, and thereafter performs data transmission under the control of a predetermined transmission control procedure, A plurality of register means (1-1 to 1-n) each holding a different synchronization character pattern, and a bit serial/parallel converter that converts and outputs serial bit data sent from the communication line (7) into parallel bit data. Means (2) compares the contents of the plurality of register means (1-1 to 1-n) with the output of the bit serial/parallel conversion means (2) and sends it out from the communication line (7). Synchronous character pattern comparison detection means (
3), and means (5) for storing a plurality of transmission control procedures (4-1 to 4-n) corresponding to the different synchronization character patterns, and the output of the synchronization character pattern comparison detection means (3). Based on the corresponding transmission control means (4-1 to 4-n
) is a communication control method.