YSI IQ SensorNet 2020 XT Terminal - Manual (Page 69)

System 2020 XT USB Installation
3 - 39 ba76019e01 12/2012
3.8 Connecting the voltage supply
Note
How to connect the voltage supply is comprehensively described in the
operating manual of the MIQ power supply module.
3.9 Commissioning
3.9.1 Topology and terminator switch
For failure-free operation, the terminator switches (terminating
resistors) must always be set to ON on two MIQ modules. On which
modules this has to be done can be taken from the topology of the
IQ S
ENSOR N ET system:
Fig. 3-26 Correct setting of the terminator switches
Main line Longest cable section with terminator switches at
its ends.
The terminator switches on both ends must be
set to ON.
If all MIQ modules are at one location, i. e. in a
module stack, the length of the main line is zero
(star-shaped wiring).
Branch line All lines that branch from the main line.
Branch lines can be branched further.
x x
s
s
s
s
s
s
s
Trunk line (”longest cable section”)
Star-shaped wiring
Branch line
Branch line 1
Branch line 2
Branch line 3
(with subbranches)
s
x
MIQ/... with terminator switch OFF
MIQ/... with terminator switch ON
Sensor
x x