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Outdated Drivers Can cause hardware related Errors. Check your PC Drivers now.

dtrDrop(1)

The DTE dropped the Data Terminal Ready signal, terminating the call. This only applies to the RS-232 NIC interface regarding modems on the packetbus. It is recommended by 3COM to use DIPswitch 1 to override the DTR signal for modems on the packetbus. Total Control Manager may relay this error incorrectly due to it being the default value until initialized to none(32). Also see User-Request.