What could cause all of the Modbus port lights to flash rapidly on my BM85C bridge mux?

If all of the Modbus port LED's are rapidly flashing simultaneously, check to see if
configuration port dip switches are correctly set. The bridge comes with all the
configuration port switch settings down, the BM85C requires the right/ upper switch to
have switch 8 in the up position. The configuration port switches are recessed and
easy to overlook.