In-Situ Level TROLL 400/500/700/700H Operators Manual - Manual (Page 66)

1-800-446-7488 66 www.in-situ.com
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 the Red and Brown wires at the same time, the device
will operate in Modbus or SDI-12 modes but not in 4-20.
Communication Protocols
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. The communication protocol that is currently in use will block
communication on the other.
Win-Situ 5 Software provides options for configuring analog/SDI-12 communications
and Modbus communications on the Tools tab.
For additional information on Modbus and SDI-12
communications, including the SDI-12 commands and Modbus
registers, see
www.in-situ.com/Technical_notes and scroll
to the Communications and Software Technical Notes section.