Bosch Appliances F.01U.252.722 7Connecting the RS-485, Incorrect connection, Correct connection

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NurseCall Relay UnitInstallation en 17

3.2.7Connecting the RS-485

One NurseCall Main Unit and up to 32 NurseCall Relay Units can be connected to an RS-485 bus. Please contact a specialist for a correct installation.

 See Section A.5.4 RS-485 socket (unit rear), page 34 for connector wiring.

CAUTION!

Do not use a star connection for the RS-485 network!

Incorrect connection:

Relay Unit 1

Main Unit

Relay Unit 2

Relay Unit n

Correct connection:

RS-485 bus (1 twisted pair cable)

100 Ω	100 Ω

Relay Unit n

Relay Unit 2

Main Unit

Relay Unit 1

NOTICE!

The NurseCall Main or Relay Units located at the two ends of the bus must be terminated with a 100 Ohm resistor.

Bosch Security Systems

User Manual

F.01U.252.722 V1 2011.12

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Contents NurseCall Relay Unit Page Table of Contents Operation MaintenanceDisposal AppendixImportance of safety instructions Safety instructionsDisregarding safety rules General safety instructions1Observation and information General description DescriptionTop view Yellow buttonBottom view Status Front viewRelay Unit rear view NurseCall Relay Unit V2.02 BN111.242.00A Detailed descriptionLoudspeaker DisplayKeys Function Relay output 4RS-485 interface5Antenna 1Unpacking 3InstallationList of contents Installation on a piece of furniture InstallationWall installation Installing the antennaConnecting to the mains Disassemble the unit see .5.1 Disassembling the unit, Correct connection 7Connecting the RS-485Incorrect connection Setting the 100 Ohm termination jumper 8Connecting the RS-232 to the Relay Plus UnitGeneralities ProgrammingDate TimeLocating ? First useOFF / on Relay Unit ID · +Assistance & Fire Priority Special settingsRelay Unit OFF Assistance & Fire Nonpriority Printer/display setup on the Relay Plus UnitMultitone Texte BAD/WC + HILFE-2 Standardtexte Technik + NOTRUF2Criter + 1 Spaces Display Zettler¬ Display Zettler Display Norsk ¬ Display Norsk Rota.of AlarmsYES ¡Display ffrrrb FL 2 +RO 3 +BE1 Selection Display Norsk5Operation Adjusting the loudspeaker volumeConsulting the alarm or event buffer Display indications Switching between alarm and event buffers indicationFirst information block Second information blockHelp Local ACKMonitoring the power supply 6MaintenanceMonitoring the backup battery Checking the systemDisassembling the unit CleaningParts replacement Procedure Backup battery replacingImportant Safety Instructions Battery DisassemblyDisposal Returning to the manufacturerAAppendix Electrical specificationsDimensions and weight List of criteria Criterion Number Alarm a or Event E CommentPower socket unit bottom ConnectorsLine socket unit bottom RS-232 socket Relay Plus Unit rearPage Bosch Security Systems

F.01U.252.722 specifications

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