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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.