Siemens REP-1 Installation Instructions Manual

Installation Instructions

Model REP-1
Network Repeater Module

INTRODUCTION

The Model REP-1 from Siemens Industry,
Inc., is an MXL module that permits the
user to extend the distance of the MXL
RS-485 network as well as the distance of
the NIM-1R RS-485 network. The REP-1
also supports both Style 4 and Style 7
wiring.

The MXL network uses an RS-485 inter­face for its network wiring. The RS-485
supports up to 32 nodes on each pair of
wires (See Note below).

Note: A node is any location where

the network wires are con­nected to the screw terminals
of an MXL System module.

The REP-1 module reproduces the RS-485
signal on a new pair of wires. The new
signal makes it possible to add more nodes
to the system.

OPERATION

An REP-1 Repeater module may be used to:

1. Add nodes to the end of a system
network by providing a repeated
network,

2. Add a Style 4 or Style 7 tap to a
system, or

3. Add a Style 4 tap to a Style 7
network.

Siemens Industry, Inc.
Building Technologies Division
Florham Park, NJ

P/N 315-092686-8

Figure 1

REP-1 Repeater PC Board

Siemens Building Technologies, Ltd.
Fire Safety & Security Products
2 Kenview Boulevard
Brampton, Ontario
L6T 5E4 Canada

Basic Repeater Operation

(Refer to Figures 2A and 2B)

The REP-1 has two independent 2-wire
RS-485 repeaters that permit the addition
of another 80 ohms of wire to a Style 4
circuit by using the REP-1 at the end of the
network. When an REP-1 Repeater is in
place, there can be up to 64 nodes on that
network; however, two of the nodes are
used for the repeater module itself.

An REP-1 module uses one node on each
network pair to which it is connected. Al­though this decreases the 32 available
nodes on a network run, the REP-1 module
adds 31 new nodes on the repeated net­work.

CSG-M Control of System Size

Even though the REP-1 supplies an
increased node count in a system, the total
system size is still controlled by the CSG-M.
This limit guarantees that the MXL System
can support the number of modules installed.

PROGRAMMING

(See Figure 1)

There is one switch (S1) and one jumper
(JP1) on the REP-1 that must be set before
installing the REP-1 in the MOM-4 module.

Setting the Switch on REP-1

The S1 switch on the REP-1 has two
positions available.

The REP-1 module occupies one node on
the original network and one node on the
repeated network in both Style 4 and Style
7 wiring.

Adding a T-Tap to a System

(See Figures 2C and 2D)

If an REP-1 module is connected along a

Style 4 or a Style 7 network, the repeated
network can run in a new direction. This
type of setup makes it possible to have a
star configuration on the network.

Converting Style 7 to Style 4 in
a System

(See Figure 2E)

A Style 4 tap can be added to a Style 7
network by using an REP-1 module. This
is helpful when installing RCC-1s and
MOI-1s/7s in a Style 7 system if Style 7 is
not required for those modules.

When an REP-1 is used to add Style 4 to a
Style 7 network, REP-1 connects to two
nodes, thus adding 30 new nodes.

• The left-side position (7 to 4) of the
switch enables conversion from
Style 7 to Style 4.

• Select the right-side position
(NORM) of the switch if the REP-1
is used as a repeater.

Selecting the Correct Position
for the JP1 Jumper

The REP-1 provides electrical isolation
between the local power supply and the
RS-485 lines. The JP1 jumper on the
REP-1 has two positions relating to this
feature—PSR and MMB.

• Select the left-side position (PSR) for
the jumper if the REP-1 is installed in
an enclosure with a PSR-1. This set­ting protects ground fault isolation for
the system. (See CAUTION on the next
page.)

• Select the right-side position (MMB)
for the jumper if the REP-1 is installed
in an enclosure with an MMB so as

to protect ground fault isolation circuits

For additional information on the MXL/MXLV
System, refer to the MXL/MXLV Manual,

P/N 315-092036.

.

2

CAUTION

For NIM-1R Network

If a REP-1 is used on a NIM-1R

network, place the JP1 jumper in the

PSR position, no matter in which type

of cabinet the REP-1 is installed.

A—Basic Repeater--Style 4

ELECTRICAL RATINGS

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tnerruCeludoMCDV42ybdnatSAm04

B—Basic Repeater--Style 7

C—T-Tap Running in One

Direction with Style 4

* Place a 120-ohm resistor,

P/N 140-820150, where indicated.

Figure 2

REP-1 Basic Wiring (Including

placement of EOL resistors)

D—T-Tap Running in Two

Directions with Style 4

E—Conversion from Style 7

to Style 4

3