JP5534605B2 - Asynchronous serial communication method - Google Patents

Asynchronous serial communication method Download PDF

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JP5534605B2
JP5534605B2 JP2010245075A JP2010245075A JP5534605B2 JP 5534605 B2 JP5534605 B2 JP 5534605B2 JP 2010245075 A JP2010245075 A JP 2010245075A JP 2010245075 A JP2010245075 A JP 2010245075A JP 5534605 B2 JP5534605 B2 JP 5534605B2
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asynchronous serial
serial communication
communication
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成実 浅井
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河村電器産業株式会社
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Description

本発明は、ホスト機と複数の端末機とが非同期シリアル通信線を介して接続された通信システムにおいて、シリアル通信信号と異なるフォーマットの制御信号を通信する方法に関する。   The present invention relates to a method of communicating a control signal having a format different from a serial communication signal in a communication system in which a host device and a plurality of terminals are connected via an asynchronous serial communication line.

非同期シリアル通信では、通常、転送速度、ビット長、パリティ等の仕様を取り決め、規定のフォーマットで通信を行っている。このため、異なるフォーマットの制御信号を送信しようとすると、通信エラーが発生し、通信自体が成立しない。そこで、例えば、特許文献１では、外部メモリに複数のフォーマットを登録しておき、端末機の種類に応じフォーマットを変えて、非同期シリアル通信を行う方法が提案されている。   In asynchronous serial communication, the communication speeds, bit length, parity, and other specifications are usually decided and communication is performed in a prescribed format. For this reason, if a control signal of a different format is to be transmitted, a communication error occurs and communication itself is not established. Therefore, for example, Patent Document 1 proposes a method of performing asynchronous serial communication by registering a plurality of formats in an external memory and changing the format according to the type of terminal.

特開２００８−４０５８２号公報JP 2008-40582 A

ところが、従来の通信方法によると、複数のフォーマットを登録しておくために、端末機に外部メモリを用意する必要がある。このため、通信システムのコストが高くつくばかりでなく、メンテナンスに手間がかかるという問題点があった。   However, according to the conventional communication method, it is necessary to prepare an external memory in the terminal in order to register a plurality of formats. For this reason, there is a problem that not only the cost of the communication system is high, but also maintenance is troublesome.

本発明の目的は、安価な通信システムを用いて、自由フォーマットの制御信号を簡易に通信できる非同期シリアル通信方法を提供することにある。   An object of the present invention is to provide an asynchronous serial communication method capable of easily communicating a free format control signal using an inexpensive communication system.

上記課題を解決するために、本発明の通信方法は、ホスト機と複数の端末機とが非同期シリアル通信線を介して接続されたシステムにおいて、ホスト機が特定端末機に通信開始を通知し、特定端末機がホスト機と他の端末機に応答電文を送信し、他の端末機が所定の時間受信を停止している状態で、同じ時間内にホスト機が自由フォーマットの制御信号を特定端末機に送信することを特徴とする。   In order to solve the above problems, the communication method of the present invention is a system in which a host machine and a plurality of terminals are connected via an asynchronous serial communication line, and the host machine notifies the specific terminal of the start of communication, The specific terminal sends a response message to the host machine and other terminals, and the other terminal stops receiving the specified time, and the host machine sends the free format control signal within the same time. It transmits to a machine.

本発明の非同期シリアル通信方法によれば、他の端末機が受信を待機している期間中に、ホスト機が制御信号を特定端末機に送信するので、安価な通信システムを用いて、自由フォーマットの制御信号を簡易に通信できるという効果がある。   According to the asynchronous serial communication method of the present invention, a host device transmits a control signal to a specific terminal during a period in which another terminal is waiting for reception. The control signal can be easily communicated.

非同期シリアル通信システムの一実施形態を示すブロック図である。1 is a block diagram illustrating an embodiment of an asynchronous serial communication system. 本発明による通信方法の一実施形態を示すフローチャートである。3 is a flowchart illustrating an embodiment of a communication method according to the present invention.

以下、本発明の実施形態を図面に基づいて説明する。図１に示すように、この実施形態の通信システム１は、一台のホスト機２に複数台の端末機３を非同期シリアル通信線４（例えばＲＳ４８５）で接続して構成されている。ホスト機２および端末機３には、それぞれ送受信回路とＭＣＵ（図示略）が装備され、ＭＣＵに搭載されたプログラムに従って双方向の非同期シリアル通信が行われる。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the communication system 1 of this embodiment is configured by connecting a plurality of terminals 3 to a single host machine 2 via an asynchronous serial communication line 4 (for example, RS485). Each of the host device 2 and the terminal device 3 is equipped with a transmission / reception circuit and an MCU (not shown), and bidirectional asynchronous serial communication is performed according to a program installed in the MCU.

図２は、ホスト機２が特定の端末機３Ａに制御信号を送信するときの通信手順を示す。ここで、まず、ホスト機２は特定端末機３Ａに通信の開始を通知する（Ｓ１１）。次に、特定端末機３Ａは、開始通知に応答する電文をホスト機２と他の端末機３Ｂに送信する（Ｓ１２）。   FIG. 2 shows a communication procedure when the host device 2 transmits a control signal to a specific terminal 3A. Here, first, the host machine 2 notifies the specific terminal 3A of the start of communication (S11). Next, the specific terminal 3A transmits a message in response to the start notification to the host machine 2 and the other terminal 3B (S12).

続いて、特定端末機３Ａは、タイマに設定された所定の時間の間、自機を受信待機状態とする（Ｓ１３）。他の端末機３Ｂは、同じタイマ設定時間の間、自機を受信停止状態とする（Ｓ１４）。そして、ホスト機２は、同じタイマ設定時間内に、自由フォーマットの制御信号を非同期シリアル通信線４を介して特定端末機３Ａに送信する（Ｓ１５）。   Subsequently, the specific terminal 3A sets its own device in a reception standby state for a predetermined time set in the timer (S13). The other terminal 3B puts its own device in a reception stop state during the same timer setting time (S14). Then, the host device 2 transmits a free format control signal to the specific terminal 3A via the asynchronous serial communication line 4 within the same timer setting time (S15).

このとき、特定端末機３Ａは、ホスト機２からの制御信号をそのままのフォーマットで自機のシリアル信号受信端子より受け取る（Ｓ１６）。この間、他の端末機３Ｂは、ホスト機２と特定端末機３Ａとの通信終了を判定するために、制御信号のモニタリングを行う（Ｓ１７）。   At this time, the specific terminal 3A receives the control signal from the host device 2 in its own format from the serial signal receiving terminal of the own device (S16). Meanwhile, the other terminal 3B monitors the control signal to determine the end of communication between the host machine 2 and the specific terminal 3A (S17).

その後、ホスト機２が送信を終了し、タイマ設定時間が経過すると、特定端末機３Ａが受信完了を判断し（Ｓ１８）、各端末機３Ａ，３Ｂが通常の受信待ち状態に復帰する（Ｓ１９，Ｓ２０）。そして、特定端末機３Ａが今回受信した制御信号の全ビット数をカウントし、この値を含む受信結果をホスト機２に報告する（Ｓ２１）。ホスト機２は、ビット数を照合し、通信結果を記録し（Ｓ２２）、一連の通信手順を終了する。   Thereafter, when the host device 2 finishes the transmission and the timer set time elapses, the specific terminal 3A determines that the reception is completed (S18), and each of the terminals 3A and 3B returns to the normal reception waiting state (S19, S19). S20). Then, the specific terminal 3A counts the total number of bits of the control signal received this time, and reports the reception result including this value to the host machine 2 (S21). The host machine 2 collates the number of bits, records the communication result (S22), and ends a series of communication procedures.

従って、この実施形態の非同期シリアル通信方法によれば、通信エラーを発生することなく、自由フォーマットの制御信号をホスト機２から端末機３に送信することができる。また、複数のフォーマットを登録するために外部メモリを用意したり、任意フォーマットに対応可能な通信プログラムのＭＣＵを使用したり、フォーマットの追加・変更に伴ってＭＣＵを交換したりする必要がなく、通信システムを安価に構成でき、メンテナンスを容易に行うことができる。   Therefore, according to the asynchronous serial communication method of this embodiment, a free format control signal can be transmitted from the host device 2 to the terminal device 3 without causing a communication error. In addition, there is no need to prepare an external memory to register multiple formats, use an MCU of a communication program that can handle arbitrary formats, or replace the MCU when adding or changing formats, The communication system can be configured at low cost, and maintenance can be easily performed.

なお、本発明は、上記実施形態に限定されるものではなく、発明の趣旨を逸脱しない範囲で、通信システムの構成や通信方法の手順を適宜に変更して実施することも可能である。   Note that the present invention is not limited to the above-described embodiment, and can be implemented by appropriately changing the configuration of the communication system and the procedure of the communication method without departing from the spirit of the invention.

１ 通信システム
２ ホスト機
３ 端末機
４ 非同期シリアル通信線 1 Communication system 2 Host device 3 Terminal 4 Asynchronous serial communication line

Claims (1)

ホスト機と複数の端末機とが非同期シリアル通信線を介して接続されたシステムにおいて、ホスト機が特定端末機に通信開始を通知し、特定端末機がホスト機と他の端末機に応答電文を送信し、他の端末機が所定の時間受信を停止している状態で、同じ時間内にホスト機が自由フォーマットの制御信号を特定端末機に送信することを特徴とする非同期シリアル通信方法。   In a system in which a host machine and multiple terminals are connected via an asynchronous serial communication line, the host machine notifies the specific terminal of the start of communication, and the specific terminal sends a response message to the host machine and other terminals. An asynchronous serial communication method, wherein a host device transmits a control signal in a free format to a specific terminal within the same time in a state where transmission is performed and other terminals have stopped receiving for a predetermined time.
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