3.1.3. CONNECTION TO RS485(2W) BUS
The converter has to be setted to operation in RS485 bus mode.
Fig. 7. ADA-4010 connection to RS485(2W) 2-wires bus and galvanic separation of SLAVE device
3.1.4. GND TERMINAL CONNECTION
Connection of GND terminals of RS485/422 interfaces, devices connected to RS485/422 bus, should be done in the case of a
potential difference of the signals grounds on interfaces RS485 / RS422, which prevents proper data transmission.
Cannot connect to the GND terminal - cables screens, PE circuit of electrical installation, signals grounds of other devices.
3.1.5. LINE TERMINATION
The application of Line Termination (terminator) Rt = 120 ohms will reduce electrical reflection in data line at high baud rate. It is not
needed below 9600Bd. The Line Termination resistor should be used if the distance is over 1000m @ 9600Bd or 700m @ 19200Bd
transmission, the resistor can be necessary if there are problems with the transmission correctness.
Example connection of Rt are shown on Fig. 6 & 7. Two Rt=120
W
, 5%, 0,25W are delivered with the converters.
3.1.6. CONNECTION OF RS232 DEVICE
Example connection of SLAVE device with RS232 interface to ADA-4010 are shown on Fig.6&7.
3.2. POWER SUPPLY
The power supply to ADA-4010 should be DC (regulated) from the scope 10 V= to 30V= and nominal power more 2W, e.g. DR-15-24.
The power cable from DC power supplies to the device must not be longer than 3m. Observe the polarity, connect positive (+) of DC
power supplies to V+ and negative (-) end to V- terminal.
ADA-4010 has the protection from opposite connection power supply.
If after power, on the front panel is not lit green LED PWR, check the power connection (polarity).
7
ADA-4010
(5) GND
GND
(2) Rx
(3) Tx
RS232
connector
DB-9F/DCE
Connector
RS485 / RS422
RS232
connector
DB-9M/DTE
ADA-I1040
GND (5)
Tx (2)
Rx (3)
Rt
Rx+
Rx-
Tx+/ A
Tx-/ B
RS485(4W) bus
PC or
MASTER device
RS232
C
o
n
n
e
ct
o
r
R
S
23
2
SLAVE-2
C
o
n
n
ec
to
r
R
S
2
32
SLAVE-3
C
o
n
n
ec
to
r
R
S
2
32
T
x+
/
A
T
x-
/
B
R
x+
R
x-
A
D
A
-4
0
10
T
x+
/ A
T
x-
/ B
R
x+
R
x-
R
t
T
x+
/
A
T
x-
/
B
R
x+
R
x-
C
o
n
n
ec
to
r
R
S
4
85
/
R
S
4
22
C
o
n
n
ec
to
r
R
S
4
85
/
R
S
4
22
C
o
n
n
e
ct
o
r
R
S
48
5
/ R
S
42
2
C
o
n
n
ec
to
r
R
S
2
32
C
o
n
n
ec
to
r
R
S
2
32
C
o
n
n
e
ct
o
r
R
S
23
2
A
D
A
-4
01
0
A
D
A
-4
0
10
SLAVE-1
RS232
RS232
G
N
D
.
.
T
x
R
x
G
N
D
.
.
T
x
R
x
G
N
D
.
.
T
x
R
x
G
N
D
.
.
T
x
R
x
G
N
D
.
.
T
x
R
x
G
N
D
.
.
T
x
R
x
Summary of Contents for ADA-4010
Page 11: ...11 ADA 4010...
