3.3.2. CONNECTION OF SUNMASTER INVERTER TO RS485(2W) BUS MODBUS-RTU
Fig 7. Example connection of ADA-4040PC3 to RS485(2W) 2-wire bus and SunMaster Inverter to ADA-4040PC3
3.3.3. LINE TERMINATION Rt
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. Should be used the Line Termination resistor if the distance is over 1000m @ 9600Bd or 700m @ 19200Bd,
and if the disturbance in transmission will appear.
Example connection of Rt are shown on Fig. 6 & 7. Four Rt=120
W
, 5%, 0,25W are delivered with the converters.
3.4. POWER SUPPLY CONNECTION
To connect power supply to the converter, should have DC power supplies (regulated) output voltage from 10 V= to 30V=, min.
nominal power 2W, e.g. HDR-15-24. Power cable from DC power supplies to device can not be longer than 3m. Should connect
positive (+) end of DC power supplies to V+ device terminal and negative (-) end to V- on terminal block. ADA-4040PC1 has protection
against power supply reverse connection. If after power connection the green LED PWR on front panel is not lit, check correctness of
power supply connection (polarisation).
4. ACTIVATION
The converter can be power on after properly connection according to section above.
If after connection power supply on front panel will not light green led PWR, check correctness of power supply connecting
(polarization). When data is present the LEDs Tx and Rx should blink
ATTENTION!
AT BAUD RATE ABOVE 38.4 KBPS THE LED'S TX, RX WILL LIGHT WEAKLY DURING DATA TRANSMISSION
4.1. DESCRIPTION OF SIGNALLING LEDS
LED
Description
PWR
Signalling of Power Supply
RX
Signalling of data receiving through ADA-4040PC3 from RTU RS485/RS422 port
TX
Signalling of data transmitting from ADA-4040PC3 through RTU RS485/RS422 port
Yellow LED by
SW1
Not light – signalling of normal operating mode (RUN)
Blinking at frequency 1 Hz - signalling of configuration mode or data flow of software to the converter.
Blinking at frequency 2 Hz - signalling of factory default mode
Lit continuously – signalling of emergency firmware update
7
ADA-4040PC3
T
x+
/
A
T
x-
/
B
G
N
D
R
x+
R
x-
R
S
4
85
(4
W
)
co
n
n
ec
to
r
SLAVE-2
MODBUS-RTU
T
x+
/
A
T
x-
/
B
G
N
D
R
x+
R
x-
R
S
4
85
(4
W
)
co
n
n
e
ct
o
r
T
x+
/
A
T
x-
/
B
G
N
D
R
x+
R
x-
R
T
U
R
S
48
5/
R
S
4
22
co
n
n
e
ct
o
r
SLAVE-1
MODBUS-RTU
GND
Rt
Rt
Rx+
Rx-
Tx+/ A
Tx-/ B
T
x+
/ A
T
x-
/ B
R
x+
R
x-
R
t
R
t
RS485 / RS422
connector
RS485(2W) BUS
19200Bd/8/N/1
MODBUS-RTU
T
x+
/
A
T
x-
/
B
G
N
D
R
x+
R
x-
T
x+
/ A
T
x-
/ B
R
x+
R
x-
R
t
R
t
MASTER
MODBUS-RTU
DEVICE
A
D
A
-4
04
0
P
C
3
M
O
D
B
U
S
-R
T
U
/ S
U
N
M
A
S
T
E
R
G
N
D
RS485(2W)
9600Bd/8/N/1
A
(5
)
B
(6
)
.
B
(3
)
A
(4
)
R
S
4
85
co
n
n
ec
to
r
R
J
45
INVERTER
QS/XS/XL/CS/TL
SUNMASTER
S
U
N
R
S
4
85
/R
S
4
2
2
co
n
n
e
ct
o
r
