cias MANTA - Page 49


CIAS Elettronica S.r.l. Ed. 1.5
Installation Handbook Page 48 of 57 MANTA 50 – 80
“STAR” NETWORK ARCHITECTURE USING “BUSREP”AS A MULTIPLIER
Line RS- 485
max 1200 mt.
L1
L4
BUSREP 1
L3
L2
Field
Device
32
2
1
1
1
3
31
Field Devices
Line RS- 485
max 1200 mt.
2
3
32
Line RS- 485
max 1200 mt.
Field Devices
2
3
32
Field Devices
2
3
32
The figure shows a system which requires a RS 485 serial line with several branch loops (“Star”
network architecture). This architecture is created using a BUSREP as a multiplier. The 4 resulting
sections can be up to 1.200 mt. long each and a maximum of 32 devices, including the BUSREP,
can be connected to each one. The first section includes the serial line converter
1
SERIAL LINE
CONVERTER
RS-485/USB
RS-485
USB
PW TX RX
Line RS- 485
max 1200 mt.
The figure shows a system which requires a RS 485 serial line that is longer than 1200 mt.
Using two BUSREP as regenerators, it was divided up into 3 sections each of which was shorter in lenght.
In this case there are less than 32 field devices, but they can be distributed on 3600 metres-long line.
Line RS- 485
max 1200 mt.
Line RS- 485
max 1200 mt.
Line RS- 485
max 1200 mt.
L1
L4
BUSREP 1
L3
L2
L1
L4
BUSREP 2
L3
L2
Field Device Field Device
Field Device
1
3
10
11
13
12
14
20
21
23
22
24
29
R
S
-
4
8
5
SERIAL LINE
CONVERTER
RS-485/USB
USB
PW TX RX