Installation guide

Modbus Plus Transaction Elements
890 USE 100 00
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Source Address
The address of the node originating the message, in the range of 1 to
64.
MAC Function Code
This field defines the action to be performed at the MAC level by the
destination.
Byte Count
This field defines the quantity of data bytes to follow in the message.
LLC Data
This field contains the LLC level packet, which includes the Modbus
command. The LLC field is detailed on the next page.