ABB SB822（3BSE018172R1）Rechargeable Battery Unit

ABB SB822（3BSE018172R1）Rechargeable Battery Unit

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In RTU mode, messages start with a silent interval of at least 3.5 char-acter times. This is most easily implemented as a multiple of charactertimes at the baud rate that is being used on the network (shown asT1-T2-T3-T4 in the figure below). The first field then transmitted is thedevice address.The allowable characters transmitted for all fields are hexadecimal 0-9,A-F. Networked devices monitor the network bus continuously, includ-ing during the 'silent' intervals. 

When the first field (the address field) isreceived, each device decodes it to find out if it is the addresseddevice.Following the last transmitted character, a similar interval of at least 3.5character times marks the end of the message. A new message canbegin after this interval

ABB SB822（3BSE018172R1）  Technical drawing:

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