ADLINK ND-6520 - Manual (Page 19)

NuDAM-6520 • 15
Functional Block Diagram
Power Regulator
& Filter
Power Input
+10V ~ +30V
+5V
GND
Isolation +5V
Isolation GND
DC to DC
Converter
TXD
RXD
RTS
GND
Receiver
RS-232
/ Driver
SW1
Opto-Isolation
Switching
Communication
Controller
Direction Control
Communication
TVS : Transient Voltage Suppresser
PTC : Positive Temperature Coefficient
RS-422/RS-485
Receiver/Driver
Data+
Data-
Rx+
Rx-
Tx+
Tx-
PTC
TVS