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4.4
Termination Resistor
If the ProtoAir is the last device on the serial trunk, then the End-Of-Line Termination Switch needs to be
enabled. To enable the Termination Resistor, move the TERM dip switch to the right as shown in
Figure
9.
Termination resistor is also used to reduce noise. It pulls the two lines of an idle bus together. However,
the resistor would override the effect of any bias resistors if connected.
NOTE: The R1 and R2 DIP Switches apply settings to the respective serial port.
NOTE: If the gateway is already powered on, DIP switch settings will not take effect unless the
unit is power cycled.
Figure 9: Termination Resistor DIP Switch
Page 14 of 66
Siemens ProtoAir Start-up Guide
R1 Termination
Resistor DIP Switch (1)
R2 Termination
Resistor DIP Switch (1)
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