User’s Guide ______________________________________________________________________
46 ___________________________________________________________________M210925EN-B
Data Communication Interfaces
0505-206
Figure 24 Data Communication Interfaces
With RS-485 and RS-422 interfaces, termination resistors need to be
used at both ends of the line, if data rate is 9600 Bd or higher and
distance is 600 m (2000 ft) or longer. Resistor range 100 ... 180 Ω is
suitable for twisted pair lines. Resistors are connected across RX- to
RX+ and across TX- to TX+ (with two-wire RS-485 only one resistor
needed).
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