ABB SPIET800 Ethernet CIU Transfer Module

ABB SPIET800 Ethernet CIU Transfer Module

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Figure B-3 'Master Query with RTU Framing' shows an example of aModbus query message. Figure B-4 'Slave Response with RTU Fram-ing' is an example of a normal response. 

Both examples show the fieldcontents in hexadecimal, and also show how a message is be framedin RTU mode.The master query is a Read Holding Registers request to slave deviceaddress 06. The message requests data from three holding registers,40108 through 40110. Note that the message specifies the startingregister address as 0107 (006B hex).The slave response echoes the function code, indicating this is a nor.

ABB SPIET800 Technical drawing:

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