When using a mix of PM3's & PM4's:<br>
1) Connect each PM3 with USB cable directly into the computer or to USB 2.0 Hub. Plug hub into power outlet.  <br>
2) Connect USB hubs together where needed, and connect them to the computer.  There should be no more than 2 USB hubs between a PM3 and the computer.<br>
3) Connect all PM4's together with Ethernet cables.<br>
4) Connect ONE of the PM4 with a USB cable to the computer.  <br>
5) Add "Terminators" to any unused RJ45 jacks on PM4 monitors.<br>