Samsung Series r5+ 550 Installation Guide download pdf (Page 221)

Hardware Installation Guide

revision 88 — 221

43. Installation

To install the Star Multiplexer, perform the installation procedures described in the following sections, in the

order in which they are presented.

43.1. Wiring

1. Wire the upstream host communication.

2. Wire the downstream device communication.

3. Wire the power input.

43.1.1 Upstream Controller Communication

The Star Multiplexer can communicate to the Intelligent System Controller by one of four downstream

ports, either by RS-485 (2-wire) communications or RS-232 to RS-485 converters. The recommended

configuration is with RS-485 (2-wire) communications.

Each port of the Intelligent System Controller (ports 2-5) can support up to four (4) Star Multiplexers within

1000 feet of the Intelligent System Controller. The Intelligent System Controller ports are not limited to only

the Star Multiplexer. The controller is capable of other addressable devices (such as the Input Control

Module, Output Control Module, Single Reader Interface Module, or Dual Reader Interface Module) on the

same port as the Star Multiplexer. However, the same distance limitation applies.

Upstream Host Communication Wiring

The RS-232 communications interface is for short distance wiring or point to point communications. This

interface is intended for a short distance communication because its high impedance is more susceptible to

noise. Cable length is generally limited to 50 feet (15m). If required, this distance may be extended to a few

hundred feet by using low capacitance shielded cables (the optimal cable is a Belden 9610 or equivalent

wire) or line signal converters.

RS-232 2-WIRE

RxDTxD

TR+

TXD

TR-

RXD

GND

RS-485 2-WIRE

TR+

TXD

TR-

RXD

GND

GND TR-TR+

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Samsung Series r5+ 550 Installation Guide Page 221