DATALOGIC |
2.4.5 RS485 Bus Termination
ON
OFF
S2
Figure 2.11 - Termination resistance switch
The switch S2 enables or disables the insertion of the bus termination resistor for RS485 Half Duplex Multidrop applications.
CAUTION
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