NEREIX MASTER - Revision 3 of 03/2010
Page7
4 TYPICAL BUS CONNECTION LAYOUTS
IMPORTANT INFORMATION ON THE BUS CONNECTION
- Respect the A and B polarity on the whole system
- Respect the layouts carried on the following pages
- Use a shielded and twisted 2 x 0.35 mm2 cable
- Connect the screen to the Master board only (C terminals) and not to the metering units (slaves)
- There must be continuity on the screen even in correspondence with the metering unit input / output
SINGLE BRANCH SYSTEM WITHOUT AMPLIFIERS
The overall length of the cable must not be more than 700 - 800 metres (indicatively).
Only the final slave must be “terminated” by a 330 Ohm resistance.
The 330 Ohm termination resistance must be placed between the terminals A and B of the last slave module
SINGLE BRANCH SYSTEM WITH AMPLIFIERS (OPTIONAL)
The overall length of the cable must not be more than 700 - 800 metres (indicatively).
Only the final slave must be “terminated” by a 330 Ohm resistance.
The 330 Ohm termination resistance must be placed between the terminals A and B of the last slave module.
MASTER
Module
1
Module
2
Module
3
Module
n.
R
R
=
=
3
3
3
3
0
0
O
O
h
h
m
m
MASTER
R
R
=
=
3
3
3
3
0
0
O
O
h
h
m
m
Module
1
Module
2
Module
3
Module
n + …
Module
n+2
Module
n+1
Signal
Amplifier
I
I
N
N
O
O
U
U
T
T
2
2
O
O
U
U
T
T
1
1
Содержание NEREIX Master
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