検索機能を使用して 500 を上回る Kepware の知識ベース記事の中から閲覧します。結果を絞り込むか、クエリーを下部の検索フィールドに入力します。

解決策が見つからなかった場合には、当社の PTC eSupport Portal で追加資料を確認することもできます。eSupport Portal へのログインを要求された場合、My Kepware の認証情報を使用できます。My Kepware アカウントが必要ですか? こちらで作成

各種検索方法:
View All Solutions

Kepware Knowledge Base: Solution


Resolving 'Communications error on COMn [***O***]'


Last Update: 2018/11/12

Possible Cause:
This is a character buffer overrun error.

Solution:
To resolve the error, refer to the instructions below.

  1. Open the Windows Device Manager. Then, click Ports | <the COM port in question> | Port Settings | Advanced.
  2. Next, decrease the Receive Buffer one notch from the maximum.
  3. Restart the computer. The new setting will not take effect until the computer has been restarted.
  4. Continue to decrease the Receive Buffer until the buffer overruns stop occurring.

Note: Do not automatically set the Receive Buffer to 1. It needs to be as high as possible without causing buffer overruns.

Related Products
KEPServerEX