NPort 5000 Series User Manual
184
NPort IA5000 Series (DIP Switches)
NPort IA5150 Models
NPort IA5250 Models
The DIP switches are located beneath the DIP switch panel on the side of the unit.
To add a 120 Ω termination resistor,
set switch 3 to ON; set switch 3 to OFF (the default setting) to
disable the termination resistor.
To set the pull high/low resistors
to 150 KΩ,
set switches 1 and 2 to OFF. This is the default setting.
To set the pull high/low resistors to 1 KΩ,
set switches 1 and 2 to ON.
Switch 4 on the port’s assigned DIP switch is reserved.
When setting up your RS-485 and RS-422 networks, you should use termination resistors to prevent signal
reflections. The NPort IA5000 Series has built-in pull high/low resistors and terminators, so you can consider
to enable them when has a communication problem by the default settings with RS-485 and RS-422
networks. The following figures illustrate how to properly configure termination for a 2-wire RS-422/RS485
network, and a 4-wire RS485 network. You will usually only need to install termination resistors (typically
120 Ω) on the first and last devices on your n
etwork.
Setting up terminators for a 2-wire RS422/RS485 network