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E149721
B - 6
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
The Historical Logs are programmed using a list of Modbus Registers that will be cop-
ied into the Historical Log record. In other words, Historical Log uses a direct copy of
the Modbus Registers to control what is recorded at the time of record capture.
To supplement this, the programmable settings for the Historical Logs contain a list of
descriptors, which group registers into items. Each item descriptor lists the data type
of the item, and the number of bytes for that item. By combining these two lists, the
Historical Log record can be interpreted.
For example: Registers 0x03E7 and 0x03E8 are programmed to be recorded by the
historical log. The matching descriptor gives the data type as float, and the size as 4
bytes. These registers program the log to record "Primary Readings Volts A-N."
Historical Log Blocks:
Start Register:
0x7917 (Historical Log 1)
0x79D7 (Historical Log 2)
0x7A97 (Historical Log 3)
Block Size:
192 registers per log (384 bytes)
The Historical Log programmable settings are comprised of 3 blocks, one for each log.
Each is identical to the others, so only Historical Log 1 is described here. All register
addresses in this section are given as the Historical Log 1 address (0x7917).
Each Historical Log Block is composed of 3 sections: The header, the list of registers to
log, and the list of item descriptors.
Header:
Registers:
0x7917 - 0x7918
Size:
2 registers
Byte
0
1
2
3
Value
# Registers
# Sectors
Interval
Summary of Contents for Shark 200S
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