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Controller Requirements and Connections
The instrument can be connected to a controller or logger for communication via the following protocols.
l
SDI-12
l
RS485 Modbus
l
RS232 Modbus (with converter)
Wiring Overview
Refer to the diagrams on the following pages. Trim and insulate unused wires. The shielded wire should be wired to a chassis
ground or earth ground. See "Safety" on page 5
Stripped-and-Tinned Cable
Signal
Color
Ground/Return
Black
External Power
Red
No Connection
Brown
RS485 (-)
Green
RS485 (+)
Blue
SDI-12
White
Power Connections
The Aqua TROLL 400 requires an external 8 to 36 VDC power source. The red wire must be connected to the positive
terminal of the power source. The black wire must be connected to the negative terminal of the power source, which is often
referred to as the system ground or return.