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Is the Modbus port on a Unity Momentum considered Modbus Port 1 when using an XMIT instruction ?

Issue
What are the Modbus port designations on a Unity Momentum M1 and M1E

Product Line
Unity Momentum, Unity Pro

Resolution
When using a Unity Momentum M1, the Modbus ports are designated as MB port 0 and MB port 1.
When using a Unity Momentum M1E, the Modbus port is designated as MB port 0.