Additional Information:

dry status description :

.iso.org.dod.internet.private.enterprises.3854.1.2.2.1.18.1.1.0 = ""
.iso.org.dod.internet.private.enterprises.3854.1.2.2.1.18.1.1.1 = STRING: "USV Carrier 230V ausgefallen"
.iso.org.dod.internet.private.enterprises.3854.1.2.2.1.18.1.1.2 = STRING: "USV Carrier Stoerung"
.iso.org.dod.internet.private.enterprises.3854.1.2.2.1.18.1.1.3 = STRING: "48V Gleichrichter 230V ausgefallen"
.iso.org.dod.internet.private.enterprises.3854.1.2.2.1.18.1.1.4 = STRING: "48V Gleichrichter Stoerung"
.iso.org.dod.internet.private.enterprises.3854.1.2.2.1.18.1.1.5 = STRING: "USV Koax Stoerung"
.iso.org.dod.internet.private.enterprises.3854.1.2.2.1.18.1.1.6 = ""
.iso.org.dod.internet.private.enterprises.3854.1.2.2.1.18.1.1.7 = ""
Dry Contact status

Here is SNMP OID for reading the dry contact status:
.1.3.6.1.4.1.3854.1.2.2.1.18.1.3.(Port-1)
The return value can be:

noStatus(1),
normal(2),
highCritical(4),
lowCritical(6),
sensorError(7),
sensorProbeSwitchStatus = 1.3.6.1.4.1.3854.1.2.2.1.18.1.3.X
Where: X is a port number starting from 0 to 7