47
A B COM
A B COM
A B COM
A B COM
MODBUS CONNECTION
Master
Slave
Slave
Slave
120 Ohm
120 Ohm
+
+
-
GROUND
EXC. -
MBUS A(+)
V
OUT
I
OUT
A.COM
TR 1 (OUT)
TR 2 (OUT)
MBUS B(-)
MBUS GND
SGN. -
EXC. +
SGN. +
ZERO
START
POWER
-
-
+
-
+
+
-
A
A
D
D
14
16
13
5
6
7
4
3
2
11
12
15
1
8
10
9
RS 485
OUTPUTS
ANALOG OUT
INPUTS
µC
- The schematic picture of the PD-20S Transmitter could be seen below. With is perfect
isolation feature, the signal quality will be excellen
t.
d. Schematic Picture
