UPort 1100 Series User’s Manual | Introduction |
1K TR
ON DIP
1 2 3
150 KX
Adjustable Pull High/low, Terminator Resistors for the
In some critical environments, you may need to add termination resistors to prevent the reflection of serial signals. When using termination resistors, it is important to set the pull high/low resistors correctly so that the electrical signal is not corrupted. The UPort uses DIP switches to set the pull high/low resistor values for each serial port.
To set the pull high/low resistors to 150 KΩ, make sure both of the assigned DIP switches are in the OFF position. This is the default setting.
To set the pull high/low resistors to 1 KΩ, make sure both of the assigned DIP switches are in the ON position.
SW | 1 | 2 | 3 |
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| Pull High | Pull Low | Terminator |
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ON | 1KΩ | 1KΩ | 120 Ω |
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OFF | 150 KΩ | 150 KΩ | Disable |
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