NISTA DEVICES GmbH 2013 © All Rights Reserved1Nista Devices Technical Support:+41 55 5085814support@nistadevices.comDocumentation on all Nista Devices GmbH products can be found on thewebsite - http://www.nistadevices.com/1 How to connect a door lock with an ownpower supplyIP394X Door Phones use a voltage free relays to control external devices like electrical door locks.Relays contacts ‘REL1’ and ‘REL2’ pins can be in Normally Open (NO) or Normally Closed (NC)states. ‘Normally Open (NO)’ state means the disconnected voltage free loop between ‘REL1/2’pins and ‘Normally closed (NC)’ state means closed loop between ‘REL1/2’ pins.The NO/NC state specified by NC/NO jumper positionNote:The Relay 2 (REL2) works only in ‘Normally Open’ mode.