JPS60142650A - Data transfer system - Google Patents

Data transfer system

Info

Publication number
JPS60142650A
JPS60142650A JP58250383A JP25038383A JPS60142650A JP S60142650 A JPS60142650 A JP S60142650A JP 58250383 A JP58250383 A JP 58250383A JP 25038383 A JP25038383 A JP 25038383A JP S60142650 A JPS60142650 A JP S60142650A
Authority
JP
Japan
Prior art keywords
data
receiving
station
request
time
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP58250383A
Other languages
Japanese (ja)
Inventor
Kazuo Koike
一男 小池
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP58250383A priority Critical patent/JPS60142650A/en
Publication of JPS60142650A publication Critical patent/JPS60142650A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/40Network security protocols

Abstract

PURPOSE:To shorten a data reception time by passing data from a communication controller to a CPU without providing a resending request wait time after receiving and checking data from an opponent station and returning an answer. CONSTITUTION:A receiving station B when receiving request to send (SEND REQ) transmits acknowledge (ACK) to receive data (DATA) and then transmits a signal DACK when the data is found correct by a CRC check. The DATA is sent to the CPU1' immediately. A transmitting station A transmits response request to resend (ENQ) unless a signal DACK at a point N of time is received. The receiving station B, on the other hand, is provided with the wait time T2 for the acknowledge resending request and resends the signal DACK when receiving the ENQ.

Description

【発明の詳細な説明】 技術分野 本発明は、データ転送方式に関し、特にデータ再送機能
を有する通信プロトコルを用いたデー;り転送方式に関
するものである。
DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a data transfer system, and more particularly to a data transfer system using a communication protocol having a data retransmission function.

従来技術 2つのステーション相互間でデータ転送を行′5場合、
第1図に示すように、各ステーションA。
Prior art When data is transferred between two stations,
As shown in FIG. 1, each station A.

Bはユーザのジョブを実行するメインCP’U l 、
 :l’とメモリ2,2、および通信を制御する通信制
御装置(CCU)のcpu3,3’とメモリ生、4′か
ら構成され、両CCU相互間を回線5で接続する。
B is the main CP'U l that executes the user's job,
1', memories 2, 2, CPUs 3, 3' of a communication control unit (CCU) that controls communication, and memory processors 4', and a line 5 connects the two CCUs.

両CCUのCPU3,3’は、通信プロトコルにしたが
って、データ転送を制御する。
The CPUs 3 and 3' of both CCUs control data transfer according to the communication protocol.

第2図は、従来の通信プロトコルのシーケンス・チャー
トである。
FIG. 2 is a sequence chart of a conventional communication protocol.

ステーション相互間でデータ転送を行う場合、受信局B
では、■’3ENDR,BQ(送信要求)を受信すると
、■これに対してACK(応答)を送信することにより
、■DATA(データ)を受信する。次に、受信したI
)ATAのCR,Cチェックを行い、これが正しい場合
、■D−ACK(CR,CチェックOKの応答)を送信
する。
When transmitting data between stations, receiving station B
Then, when ■'3 ENDR, BQ (transmission request) is received, ■ ACK (response) is sent to this, and ■ DATA is received. Next, the received I
) Check the ATA's CR and C, and if they are correct, send a D-ACK (CR, C check OK response).

このとき、■で示すように、送信局Aにおいて、もし■
のD−ACKを受信できなかった場合には、受信局Bが
正しくデータを受けられなかったものとみなし、再び■
5ENDR,EQ(送信要求)から送信を開始する。
At this time, as shown by ■, at transmitting station A, if ■
If receiving station B cannot receive D-ACK, it is assumed that receiving station B did not receive the data correctly and
Transmission starts from 5ENDR, EQ (transmission request).

このため、受信局Bでは、再送要求待ち時間T1を設け
、このT1の期間だけ再送要求が到来しない場合には、
正常終了として、受信局のメインCP U l’にDA
TAを渡してしまう。したがって、受信局BのメインC
P U l’は、再送要求待ち時間T1の期間分だけD
 A ’I” Aを受け取ることができず、転送時間が
長くなるという欠点がある。
For this reason, receiving station B sets a retransmission request waiting time T1, and if no retransmission request arrives during this T1 period,
As a normal completion, DA is sent to the main CPU of the receiving station.
I will hand over the TA. Therefore, the main C of receiving station B
P U l' is D for the period of retransmission request waiting time T1.
It has the disadvantage that it cannot receive A'I'A and the transfer time becomes longer.

目的 本発明の目的は、このような従来の欠点を改善し、相手
局のデータを受信してチェックを行い応答を返送した後
、再送要求待ち時間を設けることなく、データをCCU
からメインCPUに渡してデータ受信時間を短縮できる
データ転送方式を提供することにある。
Purpose The purpose of the present invention is to improve such conventional drawbacks, and after receiving data from the other station, checking it, and returning a response, the data is transmitted to the CCU without waiting time for a retransmission request.
The object of the present invention is to provide a data transfer method that can shorten the data reception time by passing the data from the main CPU to the main CPU.

構成 以下、本発明の構成を、実施例により説明する。composition Hereinafter, the configuration of the present invention will be explained using examples.

第3図(・工、本発明の実施例を示す通信プロトコルの
シーケンス・チャートでアル。
FIG. 3 is a sequence chart of a communication protocol showing an embodiment of the present invention.

第3図において、受信局Bは、■SEl’JD R,E
Q(送信要求)を受信すると、■へCK(応答)を送信
し、■DATA (データ)を受信することにより、デ
ータのCI(Cチェックが正しいとき、■D−A CK
を送信する。そして、■この後、直ちにメインCP U
 l’側にD A、 T Aを渡してしまう。
In Fig. 3, receiving station B is ■SEl'JD R,E
When Q (transmission request) is received, it sends CK (response) to
Send. ■After this, the main CPU immediately
DA and TA are handed over to the l' side.

送信局Aは、■の時点で■のD−A CKを受信できな
い場合、ENQ(応答再送要求)を送信する。一方、受
信局Bでは、その後、応答再送要求待ち時間T2を設け
る。もし、受信局BがENQを受信した場合には、■の
D−ACKを再送する。
If the transmitting station A cannot receive the D-ACK of ■ at the time point ■, it transmits an ENQ (response retransmission request). On the other hand, receiving station B then provides a response retransmission request waiting time T2. If receiving station B receives the ENQ, it retransmits the D-ACK of (2).

したがって、通常のデータ転送では、第2図に示す従来
のプロトコルの再送要求待ち時間T1の分だけ、転送時
間が短縮される。
Therefore, in normal data transfer, the transfer time is shortened by the retransmission request waiting time T1 of the conventional protocol shown in FIG.

第4図は、本発明における送信局と受信局の動作フロー
チャートである。
FIG. 4 is an operational flowchart of the transmitting station and receiving station in the present invention.

送信局では、第4図(a)に示すように、メイン・CP
Uから送信データを受信したならば(ステップ11 )
、5END R,EQを送信しくステップ12)、受信
側からのA CKを受信したとき(ステップ13)、1
) A T Aの送信を行う(ステップ14)。次に、
D−ACKを受信側から受信したときは終了となるが、
受信できないときには、ENQを送信する(ステップ1
5.16)。
At the transmitting station, as shown in Fig. 4(a), the main CP
If transmission data is received from U (step 11)
, 5END R, EQ is sent (step 12), and when an ACK is received from the receiving side (step 13), 1
) A T A is transmitted (step 14). next,
The process ends when D-ACK is received from the receiving side, but
If reception is not possible, send ENQ (Step 1)
5.16).

(3) 受信局では、第4図(b)に示すように、送信側から5
ENDR,EQが送られてきたか監視しくステップ21
)、送られてきたとき、ACKを送信する(ステップ2
2)。DATAを受信した後、これに対してCRCチェ
ックを行い(ステップ23゜24)、正しければD−A
CKを送信する(ステップ25)。D−ACKを送り終
ると同時に、受信DATAをメインCPUに転送する(
ステップ26)。そしてENQを受信したか否か監視し
、受信しないときは終了となり、受信したときは、D−
ACKを再送した後、終了する(ステップ27゜28.
29)。
(3) At the receiving station, as shown in Figure 4(b), the
Step 21: Monitor whether ENDR and EQ have been sent.
), send an ACK when it is sent (Step 2
2). After receiving DATA, perform a CRC check on it (steps 23 and 24), and if correct, D-A
CK is transmitted (step 25). At the same time as sending the D-ACK, transfer the received DATA to the main CPU (
Step 26). Then, it monitors whether or not it has received ENQ, and if it does not receive it, it ends, and if it does, D-
After retransmitting the ACK, the process ends (steps 27 and 28.
29).

効果 以上説明したように、本発明によればデータ再送機能を
有するプロトコルにおいて、再送要求待ち時間を設けな
くてよいため、データを送ってから受信局のメインCP
Uがデータを受信するまでの時間が、再送要求待ち時間
分だけ短縮される。
Effects As explained above, according to the present invention, in a protocol having a data retransmission function, there is no need to provide a retransmission request waiting time.
The time it takes for U to receive data is shortened by the retransmission request waiting time.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図はデータ通信における各ステーションの(4) 構成図、第2図は従来の通信プロトコルのシーケンス・
チャート、第3図は本発明の実施例を示す通信プロトコ
ルのシーケンス・チャート、第4図は本発明における送
信局、受信局の動作フローチャートである。 1.1’:メインCPU、 2.4. 2’、 4′:
メモリ、3.3’:CCUのCPU、5:通信回線。
Figure 1 is a (4) configuration diagram of each station in data communication, and Figure 2 is a sequence diagram of the conventional communication protocol.
3 is a sequence chart of a communication protocol showing an embodiment of the present invention, and FIG. 4 is an operation flowchart of a transmitting station and a receiving station in the present invention. 1.1': Main CPU, 2.4. 2', 4':
Memory, 3.3': CPU of CCU, 5: Communication line.

Claims (1)

【特許請求の範囲】[Claims] メインCP[Jと通信制御装置を備え、データ再送手段
を有する通信局において、通信制御装置が相手局からデ
ータを受信して、該データのチェックを行い、相手局に
応答を返送して応答再送要求待ちに入る前に、メインC
PU側に受信したデータを渡すことを特徴とするデータ
転送方式。
In a communication station that is equipped with a main CP [J and a communication control device and has data retransmission means, the communication control device receives data from a partner station, checks the data, returns a response to the partner station, and resends the response. Before waiting for a request, main C
A data transfer method characterized by passing received data to the PU side.
JP58250383A 1983-12-28 1983-12-28 Data transfer system Pending JPS60142650A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58250383A JPS60142650A (en) 1983-12-28 1983-12-28 Data transfer system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58250383A JPS60142650A (en) 1983-12-28 1983-12-28 Data transfer system

Publications (1)

Publication Number Publication Date
JPS60142650A true JPS60142650A (en) 1985-07-27

Family

ID=17207099

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58250383A Pending JPS60142650A (en) 1983-12-28 1983-12-28 Data transfer system

Country Status (1)

Country Link
JP (1) JPS60142650A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003500919A (en) * 1999-05-21 2003-01-07 松下電送システム株式会社 Handshake protocol retransmission procedure and device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003500919A (en) * 1999-05-21 2003-01-07 松下電送システム株式会社 Handshake protocol retransmission procedure and device

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