Functional Description; Block Diagram; Rs-422/485 Connection - Westermo TD-29 AC Manuel D'installation

7. Functional description

7.1 Block diagram

PWR
LED
0V
Line
switch
S1:4
Line
0V
S1:7
0V
Power Supply
F1

7.2 RS-422/485 connection

4-wire
Twisted pair
TD-29
9
A'
Receiver
8
B'
7
A
Transmitter
6
B
NC 5
6611-2001
Amplifier S1:6
RD
LED
FSK
Demodulator
Isolated
Power Supply
RS-422
equipment
A
Transmitter
B
A' Receiver
B'
D-Sub
RD TD SG DSR RTS
2 3 5 6
0V
5V
TD LED
DCD
LED
MCU
+5V
0V
–5V
2-wire
TD-29
Transmitter/
Receiver
NC
Screw terminal
CTS CTS RTS TD RD SG B
7 8 1 2 3 4
0V
S2:4
5V
S2:3
RTS LED
0V
S2:2
5V
CTS LED
S2:1
0V
Twisted pair
7
A/A' A/A'
6
B/B' B/B'
5
A B' A'
5 6 7 8 9
RS-485
equipment
Transmitter/
Receiver
GB.27