Rs485 Bus Termination - Datalogic C-BOX 200 Installation Manual

C-BOX 200

2.4.5 RS485 Bus Termination

The switch S2 enables or disables the insertion of the bus termination
resistor for RS485 Half Duplex Multidrop applications.
In Multiplexer applications the termination resistor must be
enabled ONLY on the last device of the chain, the farthest away
from the Multiplexer (assuming the Multiplexer is the first device
of the chain). On all the other devices this resistor MUST NOT
be enabled (S2 = OFF).
Normally it is not necessary to enable the terminator resistor (S2
always OFF); it is suggested only in applications where the
communication speed or the bus length are critical parameters.
12 - Installation
Figure 2.11 - Termination resistance switch
CAUTION
ON
OFF
S2
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