ABB S201-K2 Miniature Circuit Breaker

ABB S201-K2 Miniature Circuit Breaker

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Standard Modbus serial networks use two kinds of error checking. Par-ity checking (even or odd) can be optionally applied to each character.Frame checking (CRC) is applied to the entire message. Both the char-acter check and message frame check are generated in the masterdevice and applied to the message contents before transmission. Theslave device checks each character and the entire message frame dur-ing receipt.

The master is configured by the user to wait for a predetermined time-out interval before aborting the transaction. This interval is set to belong enough for any slave to respond normally. If the slave detects atransmission error, the message will not be acted upon. The slave willnot construct a response to the master. Thus the time-out will expireand allow the master's program to handle the error. Note that a mes-sage addressed to a nonexistent slave device will also cause a time-out. A proper time-out value is 100 ms.

ABB S201-K2 Technical drawing:

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