Westermo TD-23 - Manual (Page 9)

9 6600-2204
Functional description
Modem
chip
control
Analog filter
Frequency
modulation
Selectable
output level
Selectable
input sensitivity
Line relay
Data
buffer
DSR
GND
VCC
GND
2 or
4-wire
GND
RTS CTS DCD RD TD TD RD
Relay
output
DIP-switches
RS-232 RS-422/485
Data
buffer
Frequency
demodulation
Modem
Processor
Modulated data
OR
Block diagram