CEL-MAR ADA-4044H, User Manual

Page: 7 / 16

Fig. 4. Star type connection of devices with 4-wires RS485 interface to main 4-wires RS485 bus. Device separation from main
4-wires bus, extending the main bus by a further segments of 1200m, signal amplification, possibility of connection
additional 64 devices.
3.2.2. STAR TYPE CONNECTION FOR 2-WIRE RS485 BUS – CONFIGURATION OF 4-PORT
RS485-OUT
Using the ADA-4044H configured for operating with 4-port, 2-wire RS485 (the microswitch RS-485 PORT in position 2W), it's possible
to:
- connect up to 64 devices with 4-wire RS485 interface in 'star',
- extend the main bus by a further segments of 1200m,
- separate other segments of bus from main network – what increases the operational reliability,
- amplify the RS485 signal.
During the connecting, pay attention to the proper implementation of the connection according to the following drawings.
7
ADA-4044H
T
x+
T
x-
R
x+
R
x-
R
S
48
5(
4W
)
co
n
n
ec
to
r
G
N
D
R
t
R
t
R
x+
R
x-
G
N
D
T
x+
/
A
T
x-
/
B
IN
c
o
n
n
ec
to
r
R
S
48
5(
4W
)
O
U
T
co
n
n
ec
to
r
R
S
48
5
(4
W
)
R
2+
/A
4
R
2-
/B
4
T
2+
/A
3
T
2-
/B
3
R
t
R
t
V
ss
+
V
ss
-
V
ss
-
V
ss
+
P
ow
er
s
up
pl
y
R
1+
/A
2
R
1-
/B
2
T
1+
/A
1
T
1-
/B
1
R
t
R
t
RS485(4W)
connector
Tx-
GND
Rx+
Rx-
RS485(4W)
connector
Tx+
Tx-
GND
Rx+
Rx-
RS485(4W)
connector
Tx+
Tx-
GND
Rx+
Rx-
Tx+
Rt
Rt
A
D
A
-4
04
4H
S
LA
V
E
-3
3
S
LA
V
E
-3
4
S
LA
V
E
-6
4
...
S
LA
V
E
RS 485( 4W)
co nn ect or
Tx-
GN D
Rx+
Rx-
RS 485( 4W)
co nn ect or
Tx+
Tx-
GN D
Rx+
Rx-
RS 485( 4W)
co nn ect or
Tx+
Tx-
GN D
Rx+
Rx-
Tx+
Rt
Rt
S
LA
V
E
-2
S
LA
V
E
-1
...
S
LA
V
E
-3
2
SLAVE
R
S
48
5(
4W
)
co
n
n
ec
to
r
T
x+
T
x-
G
N
D
R
x+
R
x-
R
t
R
t
M
A
S
T
E
R
MASTER
S
eg
m
e
n
ts
o
f
2
x
R
S
4
85
(
4W
)
b
u
s
Ma in R S4 85 (4 W) bu s