JP2541439B2 - Communication control device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication control device for controlling data communication according to a data communication protocol, and more particularly to a communication control device when the line speed and the data length of data change or are changed.

[0002]

2. Description of the Related Art FIG. 4 shows a communication system including a conventional communication control device. The communication system includes a host device 11, a communication control device 12 ′, a line 13, and a terminal device 14. The communication control device 12 ′ is connected to the host device 11 and the terminal device 14 via the line 13. The communication control device 12 'includes a communication procedure processing unit 21a and a timer processing unit 22, and controls data communication according to a data communication protocol.

The communication procedure processing section 21a has a timer value recording means 33 for holding a communication protocol monitoring timer value set by the higher-level device 11 and transmission data requested to be transmitted from the higher-level device 11 according to the data communication protocol.
The timer value recording means 33 is performed by transmitting the received data, which is transmitted to the host device 11 according to the data communication protocol from the line 13 to the host device 11 and further performs data communication.
And the procedure control means 31 for requesting the timer processing section 22 to monitor the communication protocol monitoring timer value held by the timer processing section 22.

The timer processing section 22 is a communication procedure processing section 21.
The communication protocol monitoring timer value requested by a is counted down every one cycle of a constant cycle clock, and when this request timer value becomes "0", the communication procedure processing unit 21a is notified of the timeout of the communication protocol monitoring timer value. It has a constant period clock means 41. As the constant cycle clock, for example, a basic clock made from a signal oscillated by a crystal oscillator at a constant interval of seconds or milliseconds is used.

In addition, the specification and the drawings attached to the application of Japanese Utility Model Application No. 61-66536 (Japanese Utility Model Application No. 62-178640) are transferred to a microfilm (hereinafter referred to as Reference Document 1) on which the drawings are taken. It is equipped with means to calculate the data transfer time from the amount of data to be set and the set communication speed and set the monitoring time in the monitoring timer, to report the operation abnormality quickly and accurately and reduce the influence on the system. A controller is disclosed.

Further, in Japanese Patent Laid-Open No. 2-237242 (hereinafter referred to as Reference 2), the terminal communication speed is detected and notified to the opposite station side, and automatically based on the communication speed information from the opposite station. There is disclosed a data line terminating device in which the communication speed can be automatically set by providing a monitoring controller for switching the communication speed.

Further, in Japanese Patent Laid-Open No. 2-200045 (hereinafter referred to as Reference Document 3), a communication timing signal from a modulator / demodulator is used as an input to store the counted value, and the value read from the storage means is used. A maintenance system of a communication control device is disclosed in which the user can be notified of the line speed inconsistency set by the modulation / demodulation device by determining the communication timing speed.

According to Japanese Utility Model Laid-Open No. 62-86750 (hereinafter referred to as Reference Document 4), additional data representing the data length is added to the transmitted text on the transmitting side and extracted on the receiving side to obtain the text data length. Disclosed is a time monitoring control device in a data transmission system, which sets a text data length monitoring time based on a set time of a character-to-character monitoring timer and can effectively perform time monitoring on variable-length text data. There is.

[0009]

In the above-mentioned conventional communication control device, there are different line speeds for each user and for each line, and the communication protocol monitoring timer value is manually set corresponding to each line speed. It is necessary to implement so-called system generation (hereinafter referred to as SG). Further, when the line speed is changed, it is necessary to reset the communication protocol monitoring timer value that has been set once again to a value corresponding to the line speed.

Further, there is a different data length for each user or for each line, and it is necessary to carry out so-called SG in which the communication protocol monitoring timer value is manually set in correspondence with each data length. Further, when the length of the data to be communicated is changed, it is necessary to reset the communication protocol monitoring timer value once set to a value corresponding to the length of the data to be communicated.

Therefore, the conventional communication control device has the following drawbacks.

Since the communication protocol monitoring timer value which is different for each user or each line is manually set, a setting error is likely to occur when the number of lines is large, and a line failure occurs due to the setting error of the communication protocol monitoring timer value. , It takes time to detect and correct the setting error of the communication protocol monitoring timer value.

Further, even when it is necessary to change the line speed and the communication data length, it is necessary to manually reset the communication protocol monitoring timer value. It takes time to detect and correct an incorrect value setting.

Further, the communication control device disclosed in the above-mentioned reference 1 is for early detection of a hardware abnormality, and the monitoring time obtained by calculation is not used for procedure control. The clock used is also the clock generated by the device itself, and the clock from the line is not used.

Further, the data line terminating device disclosed in Reference 2 only sets the communication speed automatically and does not use the set communication speed for procedure control.

Further, in the communication control device maintenance method disclosed in Reference 3, the user is notified of the inconsistency between the predetermined line speed and the line speed actually set by the modulator / demodulator. However, the received communication timing signal is not used for procedure control.

Since the time monitoring control device in the data transmission system disclosed in the above-mentioned reference document 4 needs to add the additional data indicating the data length in the transfer data, the structure becomes complicated and the additional data is added. As a result, the transmission efficiency of desired data deteriorates.

Therefore, an object of the present invention is to provide a communication control device which eliminates the need to set the SG of the monitoring timer value when the difference in data transfer length or the data transfer length is changed.

Another object of the present invention is to provide a communication control device which does not require SG setting of a monitoring timer value when the line speed is changed or the line speed is changed.

[0020]

A communication control device according to the present invention is connected to a host device and a terminal device via a line, controls data communication in accordance with a data communication protocol, and communicates with a communication procedure processing unit. And a timer processing unit.

According to the communication control device of the first aspect of the present invention, the communication procedure processing unit determines the length of the transmission data requested to be transmitted from the host device and the reception data received from the line according to the data communication protocol. A data length timer value calculation means for calculating a communication protocol monitoring timer value necessary for controlling the data communication protocol, and transmission data requested to be transmitted by the host device to the line according to the data communication protocol, and the line communication protocol And a procedure control unit for requesting the timer processing unit to monitor the communication protocol monitoring timer value calculated by the data length timer value calculation unit by transferring the received data received according to the above to the upper device and further performing data communication. However, the above timer processing unit uses the communication protocol monitoring timer value requested by the communication procedure processing unit. Constant period counted down for each cycle of the clock, when the request timer value becomes "0", characterized by having a fixed period clock means for notifying the time-out of the communication protocol monitoring timer value to the communication protocol processing unit.

According to the communication control device of the second aspect of the present invention, the communication procedure processing section includes timer value recording means for holding a communication protocol monitoring timer value set by the host device, and a transmission request from the host device. By transmitting the transmitted data to the line according to the data communication protocol and transferring the received data received from the line according to the data communication protocol to the host device, and further performing data communication,
And a procedure control unit for requesting the timer processing unit to monitor the communication protocol monitoring timer value held by the timer value recording unit, wherein the timer processing unit is a communication protocol monitoring timer value requested by the communication procedure processing unit. Is counted down every cycle of the communication clock of the line, and when the request timer value becomes "0", the communication procedure processing unit is provided with communication clock means for notifying the timeout of the communication protocol monitoring timer value. .

According to the communication control device of the third aspect of the present invention, the communication procedure processing unit determines the length of the transmission data requested to be transmitted from the host device and the reception data received from the line according to the data communication protocol. A data length timer value calculation means for calculating a communication protocol monitoring timer value necessary for controlling the data communication protocol, and transmission data requested to be transmitted by the host device to the line according to the data communication protocol, and the line communication protocol And a procedure control unit for requesting the timer processing unit to monitor the communication protocol monitoring timer value calculated by the data length timer value calculation unit by transferring the received data received according to the above to the upper device and further performing data communication. However, the above timer processing unit uses the communication protocol monitoring timer value requested by the communication procedure processing unit. Counts down for each cycle of line communication clock, when the request timer value becomes "0", characterized by having a communication clock means for notifying the time-out of the communication protocol monitoring timer value to the communication protocol processing unit.

[0024]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a communication system including a communication control device according to the first embodiment of the present invention. The communication control device 12 of the present embodiment has the same configuration as that shown in FIG. 4 except that the configuration of the communication procedure processing unit is different from that shown in FIG. Therefore, the communication procedure processing unit is attached at 21,
Components having the same functions as those of the components shown in FIG. 4 are designated by the same reference numerals, and their description will be omitted.

The communication procedure processing section 21 includes a procedure control means 31.
And a data length timer value calculation means 32.

The procedure control means 31 transmits a data transmission request from the higher-level device 12 to the line 13 according to the data communication protocol and receives the data received from the line 13 according to the data communication protocol, as in the conventional case. Have the function to

The data length timer value calculating means 32 has a function of calculating a communication protocol monitoring timer value indicating a monitoring time length necessary for controlling the data communication protocol, from the length of transmitted data (transfer data length).

In the same manner as the conventional one, the procedure control means 31 performs a data communication, and thereby a timer having a monitoring time length necessary for controlling the communication protocol calculated by the data length timer value calculating means 32 according to the data communication protocol. The timer processing unit 22 is requested to monitor.

The data length timer value calculation unit 32 uses the communication protocol monitoring timer value calculated from the transfer data length when the procedure control unit 31 requests the timer processing unit 22 to make a timer request. Even if it changes or changes, an appropriate communication protocol monitoring timer value can be requested from the higher-level device 11 without setting or resetting the communication protocol monitoring timer value.

Referring to FIG. 2, the communication control device 12a according to the second embodiment of the present invention is the same as that shown in FIG. 4 except that the configuration of the timer processing unit is different from that shown in FIG. It has a similar configuration. Therefore, the timer processing unit is designated by 22a, and those having the same functions as those of the constituent elements shown in FIG. 4 are designated by the same reference numerals and the description thereof will be omitted.

The timer processing section 22a is the communication clock means 4
It consists of 2. The communication clock means 42 uses the communication protocol monitoring timer value requested by the communication procedure processing unit 21 as the line 1
Count down every cycle of 3 communication clocks,
When the request timer value becomes “0”, the communication procedure processing unit 2
1a has a function of notifying the communication protocol monitoring timer value of timeout. Here, as the communication clock,
For example, CCITT, which defines an interconnection circuit between a data terminal equipment (DTE) and a data circuit terminating equipment (DCE).
(International Telegraph and Telephone Advisory Committee) In the case of 24 interfaces, the circuit 115 (receive signal element timing: RT) and the circuit 113 (transmit signal element
Timing: ST1) or circuit 114 (transmission signal element timing: ST2) is used. Here, the circuit 115 is an ON / OFF signal which is nominally equidistant at the timing for synchronizing the received data, and is the receiving timing sent by the DCE. Further, the circuit 113 is an ON / OFF signal which is nominally equidistant at the timing for synchronizing the transmission data, and gives the transmission timing transmitted by the DTE. The circuit 114 is an ON / OFF signal which is nominally equidistant at the timing for synchronizing the transmission data and gives the transmission timing to be transmitted by the DCE.

Since the communication clock means 42 uses the communication clock of the line 13 as the basic clock of the request timer value,
Even if the line speed is different or the line speed changes, the requested communication protocol monitoring timer is timed out at an appropriate time without setting or resetting the requested communication protocol monitoring timer at an appropriate time. be able to.

Referring to FIG. 3, a communication control device 12b according to a third embodiment of the present invention uses the communication procedure processing section 21 shown in FIG. 1 as a communication procedure processing section and uses it as a timer processing section in FIG. The timer processing unit 22a shown is used. Therefore, the communication control device 12b of this embodiment has the advantages of both the first and second embodiments described above.

[0035]

As described above, according to the present invention, the communication protocol monitoring timer value is calculated from the transfer data length and set, so that the communication protocol monitoring timer value differs depending on the difference in the transfer data length or the change in the transfer data length. No need to set or change values. Further, in the present invention, the unit of the communication protocol monitoring timer value is changed from the constant cycle clock such as seconds or milliseconds to the communication clock, thereby changing the communication protocol monitoring timer value due to the difference in the line speed or the change in the line speed. No need to set or change. Therefore, according to the present invention, it is possible to realize the SG of the communication protocol monitoring timer value.

[Brief description of drawings]

FIG. 1 is a block diagram showing a communication system including a communication control device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a communication system including a communication control device according to a second embodiment of the present invention.

FIG. 3 is a block diagram showing a communication system including a communication control device according to a third embodiment of the present invention.

FIG. 4 is a block diagram showing a communication system including a conventional communication control device.

[Explanation of symbols]

 11 host device 12, 12a, 12b communication control device 13 line 14 terminal device 21, 21a communication procedure processing unit 22, 22a timer processing unit 31 procedure control means 32 data length timer value calculation means 33 timer value recording means 41 constant cycle clock means 42 Communication clock means

Claims (8)

(57) [Claims] 1. A communication control device which is connected to a host device and is also connected to a terminal device via a line to control data communication according to a data communication protocol, wherein the communication control device comprises a communication procedure processing unit and a timer processing unit. The communication procedure processing unit has a communication necessary for controlling the data communication protocol based on a length of transmission data requested to be transmitted from the higher-level device and reception data received from the line according to the data communication protocol. Data length timer value calculating means for calculating a protocol monitoring timer value; reception data for transmitting transmission data requested to be transmitted from the higher-level device to the line according to the data communication protocol and received from the line according to the data communication protocol Is transferred to the higher-level device, and data communication is performed to obtain the data length. And a procedure control unit for requesting the timer processing unit to monitor the communication protocol monitoring timer value calculated by the imager value calculation unit, the timer processing unit monitoring the communication protocol requested by the communication procedure processing unit. Set the timer value to 1 of the fixed cycle clock
A communication control device comprising a constant period clock means for counting down every cycle, and notifying the communication procedure processing unit of a timeout of the communication protocol monitoring timer value when the request timer value becomes "0". . 2. The communication control device according to claim 1, wherein a basic clock generated from a signal oscillated by a crystal oscillator is used as the fixed cycle clock. 3. A communication control device connected to a host device and connected to a terminal device via a line to control data communication according to a data communication protocol, wherein the communication control device includes a communication procedure processing unit and a timer processing unit. The communication procedure processing unit holds timer value recording means for holding a communication protocol monitoring timer value set by the higher-level device; transmission data requested to be transmitted from the higher-level device according to the data communication protocol. Of the communication protocol monitoring timer value held by the timer value recording means by transmitting the received data received from the line in accordance with the data communication protocol to the host device and further performing data communication. And a procedure control unit for requesting the timer processing unit to monitor the timer. The communication protocol monitoring timer value requested by the communication procedure processing unit is counted down every cycle of the communication clock of the line, and when the request timer value becomes "0", the communication protocol processing unit monitors the communication protocol. A communication control device comprising communication clock means for notifying a timeout of a timer value. 4. The communication clock is CCITT
(International Telegraph and Telephone Advisory Committee) The communication control device according to claim 3, wherein a clock having a communication timing in the case of 24 interfaces is used. 5. The circuit 115 is used as the communication timing.
Received signal element timing RT given by, the transmit signal element timing given by the circuit 113
The communication control device according to claim 4, wherein any one of ST1 and the transmission signal element timing ST2 provided by the circuit 114 is used. 6. A communication control device which is connected to a host device and is also connected to a terminal device via a line to control data communication according to a data communication protocol, wherein the communication control device comprises a communication procedure processing unit and a timer processing unit. The communication procedure processing unit has a communication necessary for controlling the data communication protocol based on a length of transmission data requested to be transmitted from the higher-level device and reception data received from the line according to the data communication protocol. Data length timer value calculating means for calculating a protocol monitoring timer value; reception data for transmitting transmission data requested to be transmitted from the higher-level device to the line according to the data communication protocol and received from the line according to the data communication protocol Is transferred to the higher-level device, and data communication is performed to obtain the data length. And a procedure control unit for requesting the timer processing unit to monitor the communication protocol monitoring timer value calculated by the imager value calculation unit, the timer processing unit monitoring the communication protocol requested by the communication procedure processing unit. A communication clock means is provided for counting down the timer value for each cycle of the communication clock of the line, and notifying the communication procedure processing unit of the timeout of the communication protocol monitoring timer value when the request timer value becomes "0". A communication control device characterized by the above. 7. The communication clock is CCITT
(International Telegraph and Telephone Advisory Committee) The communication control device according to claim 6, wherein a clock having a communication timing in the case of 24 interfaces is used. 8. The circuit 115 is used as the communication timing.
Received signal element timing RT given by, the transmit signal element timing given by the circuit 113
The communication control device according to claim 7, wherein any one of ST1 and the transmission signal element timing ST2 provided by the circuit 114 is used.