ADLINK ND-6067 - Manual (Page 50)

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2.4.5 ND-6531 Functional Block Diagram
Figure 2-11 Block Diagram of ND-6531
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/Drive
Data+
Data-
Rx+
Rx-
Tx+
Tx-
PTC TVS