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ROHRBACK COSASCO SYSTEMS CORRATER 9020 Manual de usuario Pagina 15

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Installation
11
Maximum Number of Transmitters with 24 VDC Supply
Cable Length Wire Gauge
300 m 600 m 900 m 1200 m
AWG Dia (in) 1000 ft 2000 ft 3000 ft 4000 ft
10 0.120 32 32 32 32
12 0.096 32 32 32 27
14 0.076 32 32 22 17
16 0.060 32 21 14 10
18 0.048 27 13 9 6
20 17 8 5 4
22 10 5 3 2
The connection arrangement for multi-drop wiring is shown in figure 7.
Warning: RS 485 is a serial, not parallel, connection system. Only short connections are
permitted between the RS 485 bus and the transmitter (not more than 50 feet). Splitting
the RS 485 bus into two or more spurs of more than 50 feet is not permitted without an
RS 485 repeater module.
Conventions of designating Tx+ and Tx-, or A and B for RS 485, commonly vary with different
manufacturers. The conventions used here correspond with the EIA standard. Under idle
conditions, terminal B is positive with respect to terminal A. The corrosion computer can use a
plug-in isolating RS 485 card on a desktop or industrial computer, or an external RS 232 to RS
485 converter (preferably isolating), such as the RCS model MA-1000, on a portable computer
(see figure 8).
Figure 7 Multi-drop wiring
D
T
x
A
Tx 1
Corrosion
Computer
Tx+ (A)
RS 485
Tx- (B)
Junction
Box at TX 1
Safe Area
DC Supply
+24v +0v
Hazardous Area
A
0
v
+
2
4
v
B
ABDC
Multi-drop up to 32 transmitters
Junction
Box at TX 2
Junction
Box at TX 3
C
T
x
B
Tx 2
T
x
B
D
T
x
A
AB
0
v
+
2
4
v
C
0
v
+
2
4
v
T
x
A
T
x
B
Tx 3
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