Bosch F.01U.278.516 User Manual download pdf (Page 16)

16 en | Installation Relay Unit

F.01U.278.516 | V1.0 | 2012.11 User Manual Bosch Security Systems

3.2.6 Connecting the RS-485

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

specialist for a correct installation.

 See Section A.5.3 RS-485 socket (unit rear), page 30 for connector wiring.

Incorrect connection:

Correct connection:

CAUTION!

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

Relay Unit n

Relay Unit 1

Relay Unit 2

Main Unit

RS-485 bus (1 twisted pair cable)

Relay Unit n

Relay Unit 1

Relay Unit 2

Main Unit

100 Ω

100 Ω

NOTICE!

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

Ohm resistor.

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 31 32

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