Sonic Alert DCP301 user manual Connecting for Communications, RS-485 interface

Chapter 4. WIRING

4-13 Connecting for Communications

Some controller models support the RS-485 communications interface. Select the RS-485 communications models by selected the required catalog No.

Connect as follows.

Handling Precautions

The DCP301 operates as a slave station.

■RS-485 interface

Add-on terminal base

57

58

59

60

61

SDA

SDB

RDA

RDB

SG

Handling Precautions

•Multi-drop connection of slave stations is possible.

•Make sure that different addresses are set for each slave station.

•Provide terminating resistor (total of 4 in the case of a 5-wire system connec-

tion) on both ends of the communications path. Use terminating resistor of 150Ω± 5%, 1/2W min.

•In the case of a 3-wire system connection, short-circuit terminals (57) and (59), (58) and (60) on the DCP301.

•Do not short-circuit the RDA and RDB, or SDA and SDB terminals. Doing so might damage the DCP301.

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