YSI IQ SensorNet 2020 XT Terminal - Manual (Page 8)

Overview System 2020 XT USB
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1.2 The IQ S ENSOR N ET system 2020 XT USB
1.2.1 Structure of the system
The IQ S ENSOR N ET is a modular measuring system for online analysis.
Modular means that the essential functional units of the measuring
system are distributed in components that can be individually compiled
for special applications.
The essential functional units of the IQ S ENSOR N ET
system 2020 XT USB include:
 Terminal/controller
 IQ sensors
 Inputs (current inputs)
 Outputs (relay contacts, current outputs, valve outputs)
 Additional terminals (mobile terminals, software terminal)
 Help functions (e.g. power supply unit).
System communication The functional units are connected with one another via a common line
(Fig. 1-2). The line consists of two wires and a shield. It transports
digital information between the controller and the other modules. At the
same time, the line is used to supply all modules with electrical voltage
from a power supply unit. The power supply unit is only required for the
power supply and is not used in the system communication.