If the Dell C8618QT, C5518QT, C6522QT, C5522QT monitor is not responding to RS232 commands, ensure the correct straight-through cable is used and not the cross-over cable. Reference Figure 1 below for details on the correct RS232 cable:
Figure 1: (English Only) RS232 straight through cable with pin assignment
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After ensuring the proper RS232 cable is being used, you must disable the network connection following the steps below:
Figure 2: C8618QT onscreen controls
Figure 3: On-screen network icon
Figure 4: Network disabled icon