Cable Termination At Interface - MICRO-EPSILON IF2035-PROFINET Operating Instructions Manual

Installation and Assembly
4.2.3

Cable Termination at Interface

i
Ensure correct cable termination for an RS485 bus or RS422 bus!
We recommend a 120 Ohm terminating resistor between the signal lines at both the bus start and end. IF2035-PROFINET works as a
master for both interfaces; internally, a 120 Ohm terminating resistor has already been permanently incorporated. The IF2035-PROF-
INET should be at the bus start.
A
120
Ohm
B
IF2035
Fig. 8 Cable termination RS485,
n = max. 16 slaves
IF2035-PROFINET
120
Ohm
Slave n
Slave n-1
Fig. 9 Cable termination RS422
RX+
120
Ohm
RX -
TX -
120
Ohm
TX+
IF2035
120
Ohm
120
Ohm
Slave 1
Page 14