In-Situ Level TROLL 400/500/700/700H Operators Manual - Manual (Page 67)

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Redundant Logging
The instrument is capable of internal logging while participating in a Modbus, SDI-12 or
analog network. However, Win-Situ 5 Software cannot communicate with the
instrument while it is transmitting Modbus, SDI-12, or 4-20 mA analog data, and the
instrument cannot receive or respond to Modbus, SDI-12, or 4-20 mA analog
commands while connected to a PC serial port.
If the PLC or data logger loses data, the data that was logged internally on the
instrument can be retrieved using Win-Situ 5 Software.
If the PLC or data logger experiences power loss, the instrument will continue to collect
data using its internal batteries and clock.
A port-powered RS485 converter like that shown for Modbus connections may be used
for temporary connection of the Level TROLL to a serial port on a PC.