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Wiring the Network and Connecting the Computer
2-3
2.2.3 RS-485 Network
If your computer is equipped with an RS-485 interface, connect to the controller network
in accordance with the instructions provided with that option card.
If you plan to use a serial (COM) port to connect to your network, install an RS-232-to-
RS-485 converter on the port (see diagram below). A suitable converter is available from
Omega.
* Converter is supplied with a wallplug-mounted power
transformer.
RS-485 Communication:
One-to-many connection between an RS-232 port (with converter) and multiple
controllers; if the computer has an RS-485 port, no converter is needed
11
1
2
3
4
5
6
7
8
9
10
(B) (A)
14
12
13
Wire directly to screw terminals on
converter. B on converter goes to A
on unit, A on converter goes to B
RD(B)
RD(A)
TD(B)
TD(A)
To
Controller
Terminal 13
To
Controller
Terminal 14
(A)
(B)
GND
+12 V
Up to 2000 ft
RS-232/RS-485 converter;
Omega part number
223A001U01*
Computer
RS-232
port
Data cable assembly DB 9 to
DB 25, or DB 9 to DB 9
de
p
endin
g
on
y
our com
p
uter
Other controllers