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Enabling the Built-In 120 Ω Terminator
To enable NPort Express’s built-in 120 Ω termination resistor, you must short the
bottom two pins of jumper 6 (JP6), on DE-211’s circuit board. To do this:
1. Use a screwdriver to remove DE-211’s outer protective case, and then locate
JP6, as shown in the figures below.
2. By default, the top two pins of JP6 are shorted, which means that the built-in
120 Ω termination resistor is disabled (completely removing the jumper from
the pins also disables the resistor).
3. Use the jumper to short the bottom two pins of JP6 to enable the built-in 120 Ω
termination resistor.