Fig 5. 2-Wire connecting ADA-4040PC3 to PC with the use of ADA-I9140 USB to RS485/RS422
3.3. RS485 NETWORK CONNECTION
RS485/RS422 interface in ADA-4040PC3 converter is described as: Tx+/A, Tx-/B, Rx+, Rx-. Connection of ADA-4040PC1 to
RS485(4W) and RS485(2W) network are shown bellow.
3.3.1. CONNECTION OF SUNMASTER INVERTER TO RS485(4W) BUS MODBUS-RTU
Fig 6. Example connection of ADA-4040PC3 to RS485(4W) 4-wire bus and SunMaster Inverter to ADA-4040PC3
6
ADA-4040PC3
GND
USB
PC
USB
Rx+
Rx-
Tx+/ A
Tx-/ B
Tx+ / A
Tx- / B
Rx+
Rx-
Tx+ / A
Tx- / B
GND
Rx+
Rx-
GND
ADA-I9140
ADA-4040PC3
USB
connector
RS485 / RS422
connector
USB
connector
RTU
RS485 / RS422
connector
SUN
RS485 / RS422
connector
RS485 / RS422
connector
RS485(4W) BUS
19200Bd/8/N/1
MODBUS-RTU
MASTER
MODBUS-RTU
DEVICE
T
x+
/
A
T
x-
/
B
G
N
D
R
x+
R
x-
R
S
48
5(
4W
)
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
48
5(
4W
)
co
n
n
ec
to
r
T
x+
/
A
T
x-
/
B
G
N
D
R
x+
R
x-
R
T
U
R
S
4
85
/R
S
4
2
2
co
n
n
ec
to
r
S
U
N
R
S
4
85
/R
S
4
2
2
co
n
n
ec
to
r
A
D
A
-4
0
40
P
C
3
M
O
D
B
U
S
-R
T
U
/ S
U
N
M
A
S
T
E
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(2W)
9600Bd/8/N/1
A
(5
)
B
(6
)
.
B
(3
)
A
(4
)
R
S
4
85
co
n
n
e
ct
o
r
R
J
45
INVERTER
QS/XS/XL/CS/TL
SUNMASTER
G
N
D
G
N
D
