Solution:

If the unit can NOT be found with Vlinx Manager, there is a way to get into console mode upon powering so the user may review and reconfigure the device as necessary. Here are the steps (excerpt from the manual): By connecting the RS-232 serial port of a PC to the Serial Server Serial Port 1 through a null modem crossover cable(because the computer is a DTE device with DB-9M connectors) and powering up the unit while pressing the Shift and ~ keys in your computer keyboard together till the council screen is displayed (usually takes about 10 sec.). This method is also the alternate method to configure a Serial Server in case the Ethernet connection cannot be established.