Installation and Operation Handbook Installation
1.2.6
Wiring of 2-wire EIA-485 serial communications link
Com
Note:
All resistors are 220 ohm 1/4W carbon composition.
Local grounds are at equipotential. Where equipotential is not available wire into
separate zones using a galvanic isolator.
Use a repeater (KD845) for more than 32 units.
A
B
PC
Eurotherm Universal
Communications Interface
KD485
RX
TX
Com
Com
TX
RX
Up to 32 S2000 controllers or
Interface Units may
be included on the network
232
Com
B
A
Com
A
B
Com
A
B
Com
A
B
Local Earth
Local
Ground
Zone 1
Local
Ground
Zone 2
Area 1
Com
A
B
E
F
D
Local
Earth
HE
HF
HD
Series 2000
Controller
HE
HF
HD
Series 2000
Controller
For reasons of safety
do
not
connect to
local earth here.
Local
Earth
Local
Earth
Local
Earth
Local
Earth
Local
Earth
HE
HF
HD
Series 2000
Controller
Galvanic
Isolation
Barrier
Local
Ground
Zone 1
Local
Ground
Zone 1
Local
Ground
Zone 1
Figure 1-6: EIA-485 wiring
2-wire EIA-485 is a connection which allows up to 32 controllers
to be multi-dropped from a single communications link over a
distance of up to 1.2Km. To ensure reliable operation of the
communications link, (without data corruption due to noise or
line reflections) the connections between the controller should
be made using a twisted pair of wires inside a screened cable
with the connections terminated with resistors in the manner
shown in this diagram. This diagram also shows the use of a
Eurotherm KD485 converter to connect the EIA-485 link into a
standard EIA-232 computer port.
HA025041 issue 12 Aug 14
1-7
Summary of Contents for XST-2-0-12-1V1-E28
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