6 / 10Siemens RXZ90.1 – Receiver with PPS2 interface CA2N1644en_05Building Technologies 02.08.2010Additional notes:• The room unit starts in installation mode each time batteries are inserted (after min.30s off load)• When there are no room units in its device list, the receiver starts in installation modewhen the power supply is connected. It scans for installation signals for 3 ½ minutes,and identifies all room units in installation mode within its receiver range• The first 5 room units identified are entered in the device list of the receiver• For each receiver, a delay must precede the process of establishing communication,as the receiver can also pick up signals from other room units in the vicinity Wait at least 4 minutes between each new installation sequence• A Receiver with at least one room unit in its device list will not switch to installationmode after a power failure, but continue normal operation with the associated roomunits.• Connecting the receiver to the power supply (power ON) when the device list isempty (snap-mount RXZ90.1 receiver on mounting plate)• Connecting the controller to the power supply, when the receiver is connected tothe controller and its device list is empty• With fewer than 5 room units registered, connecting the diagnostic plug to thereceiver and pressing the button briefly ( < 1s)• Plugging the RXT20.1 service terminal into the receiver with an empty device list,and pressing the service pin on the RXT20.1 >4s• Sustained pressure (>5s) on the button of an existing room unit. The receiver willdelete this room unit from its device list and then switch to installation modeDiagnostics and the diagnostic plugThe process of establishing communication (receiver status) can be monitored byconnecting the diagnostic plug to the receiver.The plug can be assembled in-house or ordered from your national Landis & Staefaoffice. It is an aid for the service staff and cannot be purchased normally.• Connections 3 and 4 are short-circuited by a pushbutton• Connections 5 (+) and 6 (–) are used to operate a red LED• Connections 7 and 8 are used to operate the green LEDs(One of the two green LEDs will light up, depending on the polarity of the bus powersupply)Tool socketSeries resistorsR = 11.2k4 3 2 178 6 500495LEDs (2mA) Button2x green 1x redRJ45 telephone-type socketCable (8-wire)Green LED (<2mA)Green LED (Optional,lights up in event ofincorrect polarity)Red LEDPushbuttonInstallation modeDifferent ways of settingthe receiver to installa-tion mode