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Adjustable Pull High/Low Resistors for the RS-485 Port
In some critical RS-485 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. Jumpers
JP3 and JP4 are used to set the pull high/low resistor values for the
serial port. To Set the pull high/low resistors to 150 KΩ, which is the
factory default setting, leave the two jumpers open. To set the pull
high/low resistors to 1 KΩ, use the jumper caps to short the two
jumpers.
MGate MB3180 Jumpers
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