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E149701
B-10
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
NOTE:
As can be seen from the example, above, there is not a 1-to-1 relation
between the register list and the descriptor list. A single descriptor may refer to
multiple register items.
Register Items
Descriptors
0x03C7/
Float, 4 byte
0x03C8
0x1234
Signed Int, 2 byte
NOTE:
The sum of all descriptor sizes must equal the number of bytes in the data
portion of the Historical Log record.
Log Status Block:
The Log Status Block describes the current status of the log in question. There is one
header block for each of the logs. Each log's header has the following base address:
Log
Base Address
Alarms:
0xC737
System:
0xC747
Historical 1:
0xC757
Historical 2:
0xC767
Historical 3:
0xC777
I/O Change:
0xC787
PQ Event:
0xC797
Waveform:
0xC7A7
Bytes
Value
Type
Range
# Bytes
0-3
Max Records
UINT32
0 to 4,294,967,294
4
4-7
Number of Records Used
UINT32
1 to 4,294,967,294
4
8-9
Record Size in Bytes
UINT16
4 to 250
2
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