First of all, let me give you the steps on how to use Monitor. 1. Start the NI-FBUS Interface Configuration Utility. 2. In the configuration window, select the port you want to configure and click the Edit button. 3. Select Monitor for the Usage. 4. Click the OK button. Your software is configured.
Then to be clear, Configurator relies on Communications Manager (CM). While Monitor is a separate software which doesn't rely on CM at all. So to run ICU, you need to close CM first. And to run Configurator and Monitor you need to configure the interface first.
For your implementation to run Configurator and Monitor at the same time, there are two solutions. 1. you could run Configurator and Monitor at the same time on the same laptop too. In this solution, you need two USB-8486 and to configure one of them to Monitor Usage.
2. just like you mentioned to run Configurator and Monitor in two PCs. Again, you need to configure one of them to Monitor Usage.
And since the default address for NI-FBUS interface card is 16. If you didn't change the default address for the interface and run CM directly, that will have two same address card in the same network. That results in the conflict.