Installation of I / O Dry Contacts to Didactum`s remote monitoring devices

All IP-based remote monitoring units from manufacturer Didactum are equipped with inputs for Dry Contacts. A Dry Contact is also referred to as a potential-free contact or reed contact. A potential-free contact has two possible switching states: Normally Open (NO)) or Normally Closed (NC).

With the support of Dry Contacts / potential-free contacts, status and fault messages from machines and important HVAC systems are transmitted to the Ethernet-based remote monitoring devices of Didactum.

If the Dry Contact is switched, the IP-based monitoring device will send notifications and alarms via e-mail and / or SMS (via GRPS / GSM modem or e-mail to SMS gateway).
In addition, SNMP traps can be sent to building or network management solutions (such as Nagios, OpenNMS, or WhatsUp Gold). The IP networked remote monitoring unit from Didactum also support SNMPwalk functions. So the potential-free contacts / dry contacts can queried remotely at time intervals via TCP / IP network.

By means of the actuator function, the Didactum remote monitoring device can also automatically carry out measures such as the switching of 12V relay outputs. All events are recorded in the Syslog database of the Didactum monitoring device including time and date stamp.

Connection of Dry Contacts

Here we show you how to connect the AS-400 Dry Contact Management Card for UPS systems to the IP-based Monitoring System 500 II. With the support of the UPS management board, the IP-networked Monitoring System 500 II will receive following notifications:

  • UPS battery operation
  • Failure of the UPS
  • Collective alert (UPS runs on battery / charge state of UPS battery / internal UPS fault)
  • UPS is in bypass mode
  • UPS is running on battery mode