Chapter 3
–
Installation
3-4
RMBA-01 User
’
s manual
Bus termination
The built-in active bus termination must be switched on
if the RMBA-01 module is installed at the end of the
bus. Otherwise the bus termination must be switched
off. Bus termination prevents signal reflections from the
bus cable ends.
Figure 3-4 Bus termination switch (S1)
Note:
The built-in termination circuitry of the RMBA-01
is of the active type, so the module has to be powered
for the termination to work. If the module needs to be
switched off during operation of the network, the bus
can be terminated by connecting a 220 ohm, 1/4 W
resistor between the A and B lines.
ON
ON
Bus termination OFF
Bus termination ON
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