deviceControlConnectionDownDTR 1.3.6.1.4.1.8691.2.8.1.4.1.2.1.1.1.8

For some applications, serial devices must obtain the Ethernet link status by reading the DTR signal from the NPort 6000 series device server. If this setting is set to 'goes low,' DTR will change its state to low if the Ethernet link is off.