JUMPER AND SWITCH SETTINGS
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4.2.2 Host 1 RS485 HD Termination
OFF ON
Figure 8 – Host 1 RS485 HD Termination Resistance Switch
The Host 1 RS485 HD termination resistance switch 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 be OFF (disabled).
This switch must also be OFF (disabled) when Host Interface Modules
are used.
4.2.3 Host 2 RS485 HD Termination
OFF ON
Figure 9 – Host 2 RS485 HD Termination Resistance Switch
The Host 2 RS485 HD termination resistance switch 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 be OFF (disabled).
This switch must also be OFF (disabled) when Fieldbus Modules are
used.
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