C.1: Supported Link Functions; Application Layer; C.3: Data Link Layer - Electro Industries Shark 200 Installation & Operation Manual

C.3: Data Link Layer

The Shark® 200 meter can be assigned a value from 1 to 65534 as the target device
address for DNP. The data link layer follows the standard frame FT3 used by DNP Ver-
sion 3.0 protocol, but only 4 functions are implemented: Reset Link, Reset User,
Unconfirmed User Data, and Link Status, as depicted in the following table.
Refer to Section C.7 for more detail on supported frames for the data link layer.
In order to establish a clean communication with the Shark® 200 meter, we
recommend that you perform the Reset Link and Reset User functions. The Link
Status is not mandatory, but if queried, it will be attended to. The inter-character
time-out for DNP is 1 second. If this amount of time, or more, elapses between two
consecutive characters within a FT3 frame, the frame will be dropped.
C.4: Application Layer
The Shark® 200 meter's DNP version supports the Read, Write, Select, Operate,
Direct Operate and Direct Operate Unconfirmed functions. All Application layer
requests and responses follow the DNP standard. Some sample requests and
responses are included in this Appendix (see C.8: DNP Message Layouts on page C-
15).
• The Read function (code 01) provides a means of reading the critical measurement
data and status from the meter. This function code, depending upon the qualifier,
cab be used to read an individual object and point, a group of points within an
object, or all points within an object. It is also used to read Object 60, variation 1,
which will read all the available Class 0 objects from the DNP register map (see the
Object map in Section C.6). In order to retrieve all objects with their respective
variations, the qualifier must be set to ALL (0x06). See C.7: DNP Object Point Map
on page C-6 for an example showing a Read Class 0 request-data from the meter.
Electro Industries/GaugeTech
Electro Industries/GaugeTech
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The Leader In Power Monitoring and Smart Grid Solutions
Function
Reset Link
Reset User
Unconfirmed User Data
Link Status
Table C.1: Supported Link Functions
C: DNP Mapping
Function Code
0
1
4
9
#
Doc E149701 C-2