Electro Industries Shark 200T Spezifikationen PDF herunterladen (Seite 174)

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B: Modbus Map and Retrieving Logs

Electro Industries/GaugeTech

The Leader In Power Monitoring and Smart Grid Solutions

Electro Industries/GaugeTech

The Leader In Power Monitoring and Smart Grid Solutions

1 Timestamp Only

2 Image

• Normal [0]: The default record. Contains a 6-byte timestamp at the beginning,

then N data bytes for the record data.

• Timestamp [1]: The record only contains the 6-byte timestamp. This is most

useful to determine a range of available data for non-interval based logs, such

as Alarms and System Events.

• Image [2]: The full record, as it is stored in memory. Contains a 2-byte check-

sum, 4-byte sequence number, 6-byte timestamp, and then N data bytes for the

record data.

• Records Per Window: The number of records that fit evenly into a window. This

value is set-able, as less than a full window may be used. This number tells the

retrieving program how many records to expect to find in the window.

(RecPerWindow x RecSize) = #bytes used in the window.

This value should be ((123 x 2) \ recSize), rounded down.

For example, with a record size of 30, the RecPerWindow = ((123 x 2) \ 30) = 8.2

~= 8

• Number of Repeats: Specifies the number of repeats to use for the Modbus Func-

tion Code 0x23 (35). Since the meter must pre-build the response to each log win-

dow request, this value must be set once, and each request must use the same

repeat count. Upon reading the last register in the specified window, the record

index will increment by the number of repeats, if auto-increment is enabled. Sec-

tion B.5.4.2 has additional information on Function Code 0x23.

0 Disables auto-increment

1 No Repeat count, each request will only get 1

window.

2-8 2-8 windows returned for each Function Code

0x23 request.

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Electro Industries Shark 200T Spezifikationen Seite 174