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place. Unconfirmed communication is always possible and does not require a RESET.
User Data ( Function 3 )
After receiving a request for USER DATA, the meter will generate a Data Link CONFIRMATION,
signaling the reception of that request, before the actual request is processed. If a response is
required, it will also be sent as UNCONFIRMED USER DATA.
Unconfirmed User Data ( Function 4 )
After receiving a request for UNCONFIRMED USER DATA, if a response is required, it will be
sent as UNCONFIRMED USER DATA.
Address
DNP 3.0 allows for addresses from 0 - 65534 ( 0x0000 - 0xFFFE ) for individual device
identification, with the address 65535 ( 0xFFFF ) defined as an all stations address. Shark meters'
addresses are programmable from 0 - 247 ( 0x0000 - 0x00F7 ), and will recognize address 65535
( 0xFFFF ) as the all stations address.
D.3: Transport Layer
The Transport Layer as implemented on Shark meters is subject to the following considerations:
Transport Header
Multiple-frame messages are not allowed for Shark meters. Each Transport Header should indicate
it is both the first frame ( FIR = 1 ) as well as the final frame ( FIN = 1 ).
D.4: Application Layer
The Application Layer contains a header ( Request or Response Header, depending on direction )
and data. Specific notes follow.
Application Headers
Application Headers contain the Application Control Field and the Function Code.
Application Control Field
Multiple-fragment messages are not allowed for Shark meters. Each Application Header should
indicate it is both the first fragment ( FIR = 1 ) as well as the final fragment ( FIN = 1 ).
Application-Level confirmation is not used for Shark meters.
Function Codes
The following Function codes are implemented on Shark meters.
Read ( Function 1 )
Objects supporting the READ function are:
•
Binary Outputs ( Object 10 )
•
Counters ( Object 20 )
•
Analog Inputs ( Object 30 )
•
Class ( Object 60 )
e
Electro Industries/GaugeTech
Doc #: E145701
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