65
Level
trOll
Operator’s Manual
0052210 rev. 006
poWer ConneCtIonS
The Red wire provides power for Modbus and SDI-12 modes. The Brown
wire provides power for the 4-20 mA mode. If power is present on the
Brown wire and not on the Red wire, the device enters the 4-20 mA mode
automatically and stays in the 4-20 mode until power is removed from the
Brown wire or is applied to the Red wire. The Red wire has priority — if
power is applied to both wires at the same time, the device will operate in
Modbus or SDI-12 modes but not in 4-20.
CommunICatIonS
The device automatically switches between Modbus and SDI-12 modes
depending on which of the two interfaces has activity. Modbus and SDI-12
cannot be used at the same time — whichever one is currently in use will
block communication on the other.
using Win-situ
Win-Situ provides options for configuring analog/SDI-12 communications
(Setup tab) and Modbus communications (File menu > Settings). In
addition, the Level TROLL is capable of internal logging (programmed
in Win-Situ) while participating in a Modbus, SDI-12 or analog network.
However, Win-Situ cannot communicate with the Level TROLL while
it is trans mitting Modbus, SDI-12 or analog data, and conversely, the
instrument cannot receive or respond to Modbus, SDI-12 or analog
commands while connected to a PC serial port.
This “redundant logging” feature means
• if the PLC or recorder somehow “loses” data, the Level TROLL data
can be retrieved using Win-Situ.
seCtion 8: anaLoG, sdi-12, modBus
