2017717_b•en•2016-11-01
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10.2 hecklist for checking the connection work
10.2.1 orrect bus lines
JY(St)Y 2x2x0.8 mm
or
JY(St)Y 4x2x0.8 mm
YCYM 2x2x0.8 mm
or
YCYM 4x2x0.8 mm
For other line types
see chapter 3.2 on page 10
10.2.2 orrect bus structure
= Component
= Terminating resistor 120 Ω
Only a line structure is permissible – branch lines are only possible with
hubs.
Maximum length of a line 1200 m
see also chapter 3.2.1 on page 10
10.2.3 Bus termination
Terminating beginning and end of each line with 120 Ω resistor (the weather
station is terminated at the factory using jumpers with 120 Ω).
10.2.4 hecking resistance values of the bus line
In order to check the correct wiring of the bus lines, measure the resistance
between the bus lines Bus A and Bus B with a multimeter.
Approximate
measuring
value
State
Measure
0 Ω
Short circuit between the bus
lines
Check wiring, check line for
faulty insulation or damage
60 Ω
Fit bus line with two terminating
resistors
Wiring OK
120 Ω
Fit bus line with just one
terminating resistor
Connect missing terminating
resistor
∞ Ω
Bus line interrupted
Check wiring, check line for
interruptions or damage
10.2.5 ire allocation of bus line
Have the wires A and B of the bus line not been mixed up?
0 V wires of all devices and power supply units connected with each other?
