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

Page 17
Image 17
Bosch Appliances F.01U.252.722 user manual 7Connecting the RS-485, Incorrect connection, Correct connection

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