If you are not finding the unit there are a few things to check.
Make sure you have the latest firmware for you unit. We often provide firmware to ensure the communication protocols are up to date.
Make sure the wiring is correct. Make sure all the units R1 and R2 communication wires are landed to the same connectors on each. You also want to ensure they connect to the intesis box correctly. R1 > A3 and R2 >A4.