NAiS FP2 - Confirming Root no

2-14
2.4.4
Confirming Root No.
If multiple Multi Communication Units (MCU) have been installed, they are labeled “Root No. 1”, “Root
No. 2” and “Root No. 3” in sequential order, starting from the unit closest to the CPU unit.
Root numbers are not used directly in the handling of the Multi Communication Unit, but if a Multi-wire
Link Unit (when setting MEWNET-W mode or MEWNET-W2 mode), an ET-LAN unit or a computer
communication unit is being used at the same time, these numbers are sometimes specified on the
Multi-wire Link Unit or the ET-LAN unit side.
Key Point:
When the Multi Communication Unit is being used in the MEWNET-F mode, it is not counted as a Root
No.
Also when the MCU is being used in the general-purpose serial communication mode, it is not counted
as a Root No.