Westermo TD-29P - Manual (Page 13)

GB.27 6611-2022
7. Functional description
7.1 Block diagram
7.2 RS-485 connection
Amplifier S1:6
S1:7
RD
LED
DCD
LED
B A
Screw terminal
1 2 3 4 5 6 7 8
0V
F1 0V
+5V
–5V
0V
S2:4
S2:3
5V
0V
9
TD
LED
MCU
1–5, 7–9 not used
FSK
Demodulator
Isolated
Power Supply
S1:4
0V
0V
PWR
LED
Line
switch
Line
Power Supply
2-wire
7
6
A/A’
B/B’ B/B’
A/A’
Twisted pair
TD-29P
RS-485
equipment
Transmitter/
Receiver Transmitter/
Receiver