Nexstar AD 4305 Installation And Operation Manual

AD 4305

RS-485 MULTIPLEXER

Installation and
Operation

5452 Betsy Ross Drive
Santa Clara, CA 95054-1184
[phone]
FAX [phone]

P/N 66109923001 Rev. A

© 1996 Westinghouse Security Electronics. All rights reserved.

DigiReader, QuadraKey, DuraKey, NexKey and NexStar are trademarks of Westinghouse Security Electronics.

Printed in the United States of America.

LIMITED WARRANTY

Westinghouse Security Electronics (WSE) warrants to the original user the equipment
manufactured by WSE as described herein to be free from defects in material and workmanship
for a period of one year from the date of purchase by such user or fifteen (15) months from the
date of shipment from the factory, whichever is sooner (command key / magnetic stripe card
warranties differ, see below), provided:

I WSE has been notified within such period by return of any alleged defective

equipment, free and clear of any liens and encumbrances to WSE or its authorized
dealer at the address specified, transportation prepaid; and

II the equipment has not been abused, misused or improperly maintained and/or

repaired during such period; and

III such defect has not been caused by ordinary wear and tear; and

IV such defect is not a result of voltage surges/brownouts, lightning, water damage/

flooding, fire, explosion, earthquakes, tornadoes, acts of aggression/war, or similar
phenomena; and

V accessories used as integral to WSE systems have been approved by WSE (e.g.,

coaxial cables, batteries, etc.); and

VI the equipment has been installed, the installation supervised or installation tested by

an authorized WSE dealer.

WSE shall at its option, either repair or replace, free of charge, the equipment found, upon
WSEs inspection to be so defective.

WSE MAKES NO OTHER WARRANTY, AND ALL IMPLIED WARRANTIES INCLUDING ANY
WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ARE
LIMITED TO THE DURATION OF THE EXPRESSED WARRANTY AS SET FORTH ABOVE.

WSES MAXIMUM LIABILITY HEREUNDER IS LIMITED TO THE PURCHASE PRICE OF
THE EQUIPMENT. IN NO EVENT SHALL WSE BE LIABLE FOR ANY CONSEQUENTIAL,
INDIRECT, INCIDENTAL OR SPECIAL DAMAGES OF ANY NATURE ARISING FROM THE
SALE OR USE OF THE EQUIPMENT.

Some states do not allow limitations on incidental or consequential damages or how long an
implied warranty lasts, so the above limitations may not apply. This warranty gives specific legal
rights; however, other rights which vary from state to state, may pertain.

Analog command keys are warranted for 5 years; digital command key / magnetic stripe card
warranties vary. See product literature.

DR 4305 NexStar Installation and Operation

FEDERAL COMMUNICATIONS COMMISSION RADIO FREQUENCY

INTERFERENCE STATEMENT

The NexStar RS-485 Multiplexer sold by Westinghouse Security Electronics has been tested
and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC
Rules. These limits are designed to provide reasonable protection against harmful interference
in a residential installation. This equipment generates, uses and can radiate radio frequency
energy and if not installed and used in accordance with the instructions herein, may cause
harmful interference to radio communications. If this equipment does cause interference to
radio or television reception, consult the dealer or an experienced radio/television technician
for correction.

The user may find helpful the following booklet, prepared by the Federal Communications
Commission: How to Identify and Resolve Radio/TV Interference Problems." This booklet is
available from the US Government Printing Office, Washington DC 20402, stock number: 004­000-00345-4.

UL-294 Notice

294

The NexStar RS-485 Multiplexer is UL-294 listed and may be used in a UL-294 listed
access control system. All system components must be UL-294 listed and installed
according to manufacturers' instructions to comply with UL-requirements.

iv

IMPORTANT WARNING

Do not connect the NexStar without having carefully read this guide. If this is the first time you have
installed this type of device, have another person check the connections before turning on the power.
The warranty is void if you damage any component because of an error in wiring a connection. Follow
these basic procedures and precautions to avoid damage to the components (local codes and practices
may also apply and must be complied with).

P/N 66109923001 Rev A v

DR 4305 NexStar Installation and Operation

Table of Contents

Scope ................................................................................................................................................... 1

Introduction ........................................................................................................................................... 1

Specifications ........................................................................................................................................ 2

Physical Description .............................................................................................................................. 2

Cover ............................................................................................................................................. 3

Base ............................................................................................................................................... 3

PCA ................................................................................................................................................ 4

LEDs ........................................................................................................................................ 4

Fuses ....................................................................................................................................... 5

Jumpers ................................................................................................................................... 5

Phoenix Connectors ........................................................................................................................ 5

Wire Insertion .......................................................................................................................... 6

S-Net Wiring ................................................................................................................................... 7

Termination .............................................................................................................................. 8

Installation Sequence ............................................................................................................................ 8

Troubleshooting .................................................................................................................................... 9

Communications Errors ............................................................................................................ 9

List of Figures

Figure Description Page

1 S-Net Layout using a NexStar ............................................................................................ 1

2 NexStar ............................................................................................................................. 2

3 Cover Label ....................................................................................................................... 3

4 NexStar Base and Mounting Holes .................................................................................... 3

5 NexStar Printed Circuit Assembly ...................................................................................... 4

6 Transmit LEDs ................................................................................................................. .. 5

7 Termination Jumper ........................................................................................................... 5

8 Connector Pin-Outs ........................................................................................................... 6

9 Wire Insertion .................................................................................................................... 6

10 Drop Wiring ....................................................................................................................... 7

11 S-Net Termination .............................................................................................................. 8

12 Branch Isolation ............................................................................................................... 10

13 Alternate Branch Isolation ................................................................................................ 10

List of Tables

Table Description Page

1 Specifications .................................................................................................................... 2

2 Component Locations ........................................................................................................ 4

3 Approved Fuse Vendors .................................................................................................... 5

4 Recommended S-Net Cable .............................................................................................. 7

5 Troubleshooting ................................................................................................................. 9

vi

SCOPE

This manual provides information necessary to install, use and troubleshoot a NexStar RS-485
Multiplexer. It is assumed that the person reading this manual is familiar with access control
systems and standard installation practices. The information provided in this manual is not
intended to conflict with the building, electrical, fire or safety codes required for any given
installation.

INTRODUCTION

The NexStar is a symmetrical 5-port repeater with built-in arbitration logic. Any one port will
relay the data it receives to the other four ports. Bus arbitration is done on a first-come, first­served basis. During periods of no activity, the NexStar automatically places all 5 ports into the
receive mode to wait for the next message.

The NexStar provides a link between a WSE access control unit, such as the NexSentry or SE
818SC, and multiple S-Net runs. A single S-Net run may be a maximum of 4000 feet (1200
meters). Using all of the NexStar 's five symmetrical ports, the end-to-end S-Net length can
span up to 8000 feet (2400 meters) and contain up to 20,000 feet (6000 meters) of installed
wiring.

ACCESS

CONTROL

UNIT

4000 FEET

(1200 METERS)

DR 4205K

MSRK

NEXSTAR

DR 4205

DR 4204

DR 4208

Figure 1: S-Net Layout using a NexStar

VIP2

DR 4204

DR 4205K

P/N 66109923001 Rev. A 1

DR 4305 NexStar Installation and Operation

g

g

In the simplest configuration, the NexStar allows home-run wiring which eliminates excessively
long wire runs and the need to make multiple connections to a single terminal block

SPECIFICATIONS

Specifications for the NexStar are shown in the table below.

Table 1: Specifications

Inp ut Voltag e +15 to +28 VDC

Operating Current 50mA

Pass-Thru Current 2A

Operating Humidity 0 to 90%, non-condensin

Operating Temperature -4° F to 50° F -20° C to +50° C

Size 8 in X 4.5 in X 1.5 in 20 cm X 11 c m X 3.5 cm

Weight 13 oz 400

PHYSICAL DESCRIPTION

The NexStar consists of a single printed circuit assembly (PCA) in a two-part housing. Male
Phoenix connectors on the PCA are accessed through the side of the housing for port
connections.

4 PLACES

COVER

PCA

BASE

Figure 2: NexStar

2

COVER

The cover of the NexStar snaps onto the base. The LEDs mounted on the PCA are visible
through holes on the cover. A label identifies the LEDs and pin-out wiring for each port.

COM ACTIVE

TX-1 TX-2 TX-3 TX-4 TX-5

SHIELD

COMMON

DATA

DATA+

+28 VDC

SHIELD

COMMON

DATA

DATA+

+28 VDC

SHIELD

COMMON

DATA

DATA+

+28 VDC

SHIELD

COMMON

DATA

DATA+

+28 VDC

Figure 3: Cover Label

SHIELD

COMMON

DATA

DATA+

+28 VDC

BASE

The base of the housing has four through holes for mounting the NexStar to a wall or other
surface. Four standoffs are affixed to support the PCA.

7.29 in

(18.5 cm)

3.2 in

8.1 cm)

STANDOFF

4 PLACES

MOUNTING HOLE

4 PLACES

P/N 66109923001 Rev. A 3

Figure 4: NexStar Base and Mounting Holes

DR 4305 NexStar Installation and Operation

PCA

All components and circuitry are contained on the single PCA. Figure 5 shows the board
locations of connectors, fuses, LEDs and jumpers. These components are listed in Table 2 and
further described below.

LEDS

Figure 5: NexStar Printed Circuit Assembly

Table 2: Component Locations

PCA Location

Lab el Fu nc tion LED Connector Jumper Fus e

TX-1 Port 1 Transmit CR18 J5 JP5 F5

TX-2 Port 2 Transmit CR17 J4 JP4 F4

TX-3 Port 3 Transmit CR16 J3 JP3 F3

TX-4 Port 4 Transmit CR15 J2 JP2 F2

TX-5 Port 5 Transmit CR14 J1 JP1 F1

COM ACTIVE Active CR19

The COM ACTIVE LED will be illuminated when any data is being passed through the NexStar.
The five port LEDs will illuminate when the associated port is transmitting. On the left side of
Figure 6, the NexStar is receiving data from an ACU on port one. This data is then transmitted

4

to all the remaining ports. All LEDs except TX-1 are illuminated. On the right side of the figure,
the NexStar is receiving data from an S-Net device on port 3. Again, data is transmitted to all
other ports; all LED's except TX-3 are illuminated.

FUSES

COMM ACTIVE

TX-1 TX-2 TX-3 TX-4 TX-5

ACU S-NET S-NET S-NET S-NET

COMM ACTIVE

TX-1 TX-2 TX-3 TX-4 TX-5

ACU S-NET S-NET S-NET S-NET

Figure 6: Transmit LEDs

Note: High speed network communications may cause all LEDs to appear illuminated.

Each of the five ports on the NexStar is individually fused. Fuses for the ports are located at
positions F1 through F5 on the PCA. These fuses are 2-amp, normal-blow. Approved suppliers
for replacement fuses and the vendor's part numbers are shown in Table 3.

Table 3: Approved Fuse Vendors

Ven dor Part Number

L ittlefu se 273002

Bel MB2

JUMPERS

Five jumpers on the PCA can be used to provide termination required (see page 8) for S-Net
lines. Installing a jumper enables a 120-ohm, ¼ watt resistor.

NO TERMINATION 120 OHMS TERMINATION

Figure 7: Termination Jumper

P/N 66109923001 Rev. A 5

DR 4305 NexStar Installation and Operation

D

ata twisted pair

Figure 8: Connector Pin-Outs

The shield wire is connected to the ACU ground to provide single-point grounding. See the
appropriate ACU manual for additional information.

+28 VDC

Power and Ground

twisted pair

DATA+

GROUND

DATA

SHIELD

WIRE INSERTION

For wire insertion to Phoenix connectors, the following procedure is recommended:

1. Strip the wire end.

2. Twist the exposed strands tightly and tin the ends.

3. Crimp an appropriate size ferrule on the end of the wire. Be sure that the ferrule is crimped
on bare conductor metal, not the insulation.

PHOENIX

CONNECTOR

CRIMP

SLEEVE

WIRE

Figure 9: Wire Insertion

4. Insert ferrule in the appropriate Phoenix connector terminal. Tighten the connector binding
screw and torque to 5 inch-pounds (0.56Nm).

6

S-NET WIRING

S-Net is a serial network for communication between the ACU and node devices. Typically, the
cable used is two twisted-pairs with an overall shield; one pair is for data, the other pair is for
DC power. While the maximum length of an S-Net branch is 4,000 feet (1200 meters), it is
recommended that separate twisted-pair cables for data and power when lengths exceed 500
feet (150 meters). Table 4 lists recommended cable.

S-Net Length < 500 Feet

Data and Power

S-Net Length > 500 Feet

Data Only

S-Net Length > 500 Feet

Po wer On ly

S-Net cable should be installed as a single cable; splices should be soldered or secured with
crimp lugs. Drop-lines to a S-Net devices should not exceed 6 feet (1.85 meters) in length.

Table 4: Recommended S-Net Cable

Ty p e Description Gauge

Belden 9552
Belden 1069

Belden 9841 1-Pair 24 AWG

Belden 9341
Belden 9342
Belden 9343

2-Pair

2-Co nduct or

18 AWG
16 AWG

18 AWG
16 AWG
14 AWG

CRIMP LUGS

OR SOLDER

S-NET RUN
MAXIMUM LENGTH
4000 FT (1200 M)
TERMINATE AT EACH END

S-NET

DEVICE

Figure 10: Drop Wiring

DROP
MAXIMUM LENGTH
6 FT (1.85 M)
DO NOT TERMINATE

P/N 66109923001 Rev. A 7

DR 4305 NexStar Installation and Operation

TERMINATION

Each S-Net run must be terminated at each end with a 120-ohm, ¼ watt resistor connected
between the data lines. Figure 11 is a sample block diagram indicating where termination
resistors must be installed. In this diagram, an S-Net device may be an ACU, DigiReader,
keypad, etc. See Figure 7 for installing the termination jumpers for NexStar ports.

Figure 11: S-Net Termination

INSTALLATION SEQUENCE

The basic steps to install the NexStar are:

1. Install S-Net wiring. See page 7 for wiring information

2. With cover on to protect the PCA, mount te NexStar base. See Figure 4.

3. Terminate S-Net branches at each end. See the above for information on termination
requirements for each S-Net branch. Remove the NexStar cover to install jumpers as
required.

4. Replace the NexStar cover if removed in step 3.

5. Make S-Net connections.

8

TROUBLESHOOTING

g

p

p

g

g

g

jump

Table 5 lists error symptoms and suggests troubleshooting actions.

Table 5: Troubleshooting

Po wer Faults

Check fuses

No LEDs illuminated

No communciations on one port

No power at one or more ports

All lights steady except on one port Data A and data B wiring may be reve rsed. Check wiring on port with unlit LED.

Excessive data errors

Check wirin

Ver ify DC voltage to unit

ower is present, ACU may be off-line

If

Check

ort fuse

Check port wirin

Check fuses for affected ports

Ch eck wirin

Check wirin

Check termination resistors and

for affected ports

Communications Errors

shield connections for ground loops

ers

COMMUNICATIONS ERRORS

1. Keep port with the ACU connected to the NexStar (see Figure 12).

2. If the ACU branch does not include other S-Net devices, connect a second branch (see
Figure 13).

3. Verify correct operation of ACU and S-Net devices.

4. If problems are detected, perform troubleshooting procedures for communications errors
as listed in Table 5.

5. When no problems are detected, connect other branches, one at a time, and repeat steps
3 and 4.

P/N 66109923001 Rev. A 9

DR 4305 NexStar Installation and Operation

Figure 12: Branch Isolation

10

Figure 13: Alternate Branch Isolation