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C: DNP Mapping
Electro
Industries/GaugeTech
The Leader In Power Monitoring and Smart Grid Solutions
Electro
Industries/GaugeTech
The Leader In Power Monitoring and Smart Grid Solutions
[dst] and [src] are the device address of the Shark® 200S meter and Master device,
respectively. Refer to Section C.7 for more detail on supported frames for the data
link layer.
In order to establish optimal communication with the Shark® 200S meter, we
recommend that you perform the Reset Link and Reset User functions. The Link
Status is not mandatory, but can be performed as well. The inter-character time-out
for DNP is 1 second. If this amount of time, or more, elapses between two consecu-
tive characters within a FT3 frame, the frame will be dropped.
C.4: Application Layer
The Shark® 200S meter’s DNP version supports the Read, Write, Direct Operate and
Direct Operate Unconfirmed functions.
• The Read function (code 01) provides a means for reading the critical measurement
data from the meter. This function should be posted to read object 60 variation 1,
which will read all the available Class 0 objects from the DNP register map. See the
register map in Section C.6. In order to retrieve all objects with their respective
variations, the qualifier must be set to ALL (0x06). See Section C.7 for an example
showing a read Class 0 request data from the meter.
• The Write function (code 02) provides a means for clearing the Device restart bit in
the Internal Indicator register only. This is mapped to Object 80, point 0 with varia-
tion 1. When clearing the restart device indicator use qualifier 0. Section C.7 shows
the supported frames for this function.
• The Direct Operate function (code 05) is intended for resetting the energy counters
and the Demand counters (minimum and maximum energy registers). These
actions are mapped to Object 12, points 0 and 2, which act as control relays. The
relays must be operated (On) in 0 msec and released (Off) in 1 msec only. Qualifi-
ers 0x17 or x28 are supported for writing the energy reset. Sample frames are
shown in Section C.7.
• The Direct Operate Unconfirmed (or Unacknowledged) function (code 06) is
intended for asking the communication port to switch to Modbus RTU protocol from
DNP. This switching acts as a control relay mapped into Object 12, point 1 in the
meter. The relay must be operated with qualifier 0x17, code 3 count 0, with 0
milliseconds on and 1 millisecond off, only. After sending this request the current
Summary of Contents for Shark 200S
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