Contemporary Control Systems EXP User Manual

MOD HUB Series

A Line of Modular Active Hubs for ARCNET®
Local Area Networks

User Manual

#TD401600-0MO

®

Trademarks

Contemporary Controls, ARC Control, ARC DETECT and
EXTEND-A-BUS are trademarks or registered trademarks of
Contemporary Control Systems, Inc. ARCNET is a registered
trademark of Datapoint Corporation. Other product names may be
trademarks or registered trademarks of their respective companies.
TD401600-0MO Revised November 2010

Copyright

© Copyright June 1996–2010 by Contemporary Control Systems,
Inc. All rights reserved. No part of this publication may be
reproduced, transmitted, transcribed, stored in a retrieval system, or
translated into any language or computer language, in any form or
by any means, electronic, mechanical, magnetic, optical, chemical,
manual, or otherwise, without the prior written permission of:

Contemporary Control Systems, Inc.
2431 Curtiss Street
Downers Grove, Illinois 60515 USA
Tel: [phone]
Fax: [phone]
E-mail: [e-mail]
WWW: http://www.ccontrols.com

Contemporary Controls Ltd

14 Bow Court
Fletchworth Gate

Coventry CV5 6SP UK
Tel: [phone]
Fax: [phone]
E-mail: [e-mail]

Disclaimer

Contemporary Control Systems, Inc. reserves the right to make
changes in the specifications of the product described within this
manual at any time without notice and without obligation of
Contemporary Control Systems, Inc. to notify any person of such
revision or change.

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Contents

Chapter 1 Introduction......................................................... 1

1.1 Description ................................................ 1

1.2 Benefits ..................................................... 2

1.3 Specifications ............................................ 2

1.4 Regulatory Compliance ............................. 4

1.5 Power Requirements ................................. 4

1.6 Ordering Information ................................ 4

Chapter 2 Installation ........................................................... 6

2.1 Introduction ............................................... 6

2.2 Electromagnetic Compliance ..................... 6

2.3 Flange Mounting ....................................... 7

2.4 MTG-RAK — Rack Mounting Kit........... 7

2.5 Connecting Cables to the MOD HUB ....... 8

2.6 Turning the Active HUB “ON” ............... 16

2.7 Ensuring Proper HUB Operation ............ 17

2.8 Troubleshooting T ips .............................. 17

2.9 Isolating Faulty Nodes with Line

Activity Indicators................................... 19

2.10 Supporting Extended T imeouts ............... 20

Chapter 3 Operation .......................................................... 22

3.1 Theory of Operation ................................ 22

Chapter 4 Service ............................................................... 24

Technical Support .............................................. 24

Warranty ............................................................. 24

Returning Product for Repair ............................. 24

Declaration of Conformity.................................. 24

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Appendix

Permissible Segment Lengths ............................ 25

List of Figures

Figure 2-1 EIA-485 Daughterboards .................................. 13

Figure 2-2 Each -485 hub port has provisions for

applying bias and termination. Make sure
common mode voltage (Vcm) does not

exceed +/–7 Vdc ............................................... 14

Figure 2-3 AC Coupled EIA-485 Option (-485X) ............. 15

Figure 2-4 Front Panel of the MOD HUB Shown

Fully Loaded ..................................................... 16

Figure 2-5 The extended timeout settings only affect

the RECON light with no affect to the hub

operation ........................................................... 21

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1 Introduction

1.1 Description

The MOD HUB series of modular active hubs provides a
convenient and flexible method of expanding ARCNET local
area networks. EXP expansion modules are installed into the
MOD HUB that support the particular cabling technology
desired. The MOD HUB is available with either four expansion
slots or twelve. Since most expansion modules support four
ports each, a total of 48 ports can be provided within one hub.
MOD HUBs can be cascaded via an expansion port on each hub
to expand the network to the limit of the ARCNET technology .

The MOD HUB is provided with an integral universal voltage
power supply , four or sixteen slot card cage and internal timing
module permanently installed into the hub's backplane. There
are no expansion modules provided with the MOD HUB. The
timing module uses a precision delay line timing generator
which regenerates the incoming ARCNET signal without
introducing excessive bit jitter . The regenerated signal is then
sent to all other ports on the hub. A watchdog timer is included
to prevent the possibility of hub lockup eliminating the necessity
of cycling power on a failed hub. The hub unlatch delay time is
derived from a crystal oscillator for high accuracy and
repeatability .

Active hubs increase the robustness of ARCNET networks.
They maximize the distance that can be achieved on each cable
segment — up to 2000 feet on coaxial segments. They prevent
interference to the network by squelching reflections caused by
open or shorted cable segments attached to the hub. Unused hub
ports need not be terminated. Active hubs allow for a distributed
star topology , thereby minimizing the cabling required in a
plant.

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There are several LED indicators that assist in troubleshooting
the network. One LED indicator informs if the network has
undergone a reconfiguration. Another indicator senses if the hub
is properly generating internal hub signals. There are separate
LEDs that monitor the two internal power supplies.

1.2 Benefits

• Compatible with the baseband ARCNET network

• Compatible with all Contemporary Controls’ (CC) network

interface modules (NIMs)

• Supports up to 48 ports in four-port increments

• Two sizes of enclosures: 16 and 48 ports

• Offers easy expansion with plug-in modules

• Mixes coaxial, twisted-pair and glass fiber optic cable

in one hub

• Isolates network faults with diagnostic LEDs

• LED indicator identifies reconfiguration of the network

• Minimizes hub jitter with precision delay line timing

• Activity LEDs for each port

• Provision for rack mounting

• Watch-dog timer prevents hub lockup

• Hub unlatch delay digitally controlled

1.3 Specifications

Mechanical
See diagrams on page 3.

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Environmental
Operating temperature:

Storage temperature: –

0°C

40°C

to
to

+60°C

+85°C
Functional
Hub delay: 320 ns (typ)

Unlatch delay time: 5.9 µs (typ)
Extended timeouts: Supports all three extended ARCNET
timeouts.
Signalling rate: 2.5 Mbps nominal
Compliance: ANSI/A TA 878.1

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1.4 Regulatory Compliance

UL 1950 listed
cUL listed per CSA 22.2 No. 950-95
IEC 950 classified
CFR 47, Part 15 Class A
CE Mark

1.5 Power Requirements

Electrical

MODHUB-16 series MODHUB-48 series

Input voltage: 100 VAC to 230 VAC 100 VAC to 230 VAC

(+/–10%) (+/–10%)
Input current: 0.5 amps max 1.0 amps max
Input frequency: 47 Hz to 63 Hz 47 Hz to 63 Hz
Input fuse(s): 1 amp slo blo 1 amp slo blo

5 mm x 20 mm 5 mm x 20 mm

1.6 Ordering Information

Select an adequately sized MOD HUB for the number of ports
required. The MODHUB-16 has four slots and can support up
to 16 ports. The MODHUB-48 has twelve slots and can support
up to 48 ports. EXP expansion modules generally support four
ports each and are ordered separately . Refer to EXP data sheets
for detailed information.

MOD HUB “E” designation means export model and is shipped
with a continental Europe power cord. These units have two
input fuses to address unpolarized power systems and carry the
CE Mark. This model can be modified at the factory for single
fuse operation if requested.

MOD HUB “F” designation means flange-mounted enclosure
which is standard for panel-board mounting. For rack mounting,
do not specify the “F” designation, but order a MTG-RAK
instead. The MTG-RAK supports either two MODHUB-16s
(-16Es) or one MODHUB-48.

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MODHUB-16F-N designation means that a version of the
MODHUB-16F (with vented cover) is installed into a NEMA 1
enclosure. A duplex receptacle is provided inside the NEMA 1
enclosure. This receptacle must be wired via a conduit
connection from an appropriate power source.

Model Description
MODHUB-16 16-pt. powered card cage

(120V 50/60 Hz)

MODHUB-16E 16-pt. powered card cage

(230V 50/60 Hz)

MODHUB-16F 16-pt. powered card cage flange

mounted (120V 50/60 Hz)

MODHUB-16EF 16-pt. powered card cage flange

mounted (230V 50/60 Hz)

MODHUB-16F-N 16-pt. powered card cage flange

mounted NEMA 1 enclosure
(120V 50/60 Hz)

MODHUB-48 48-pt. powered card cage

(120V 50/60 Hz)

MODHUB-48E 48-pt. powered card cage

(230V 50/60 Hz))

MTG-RAK MODHUB rack-mounting kit

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2 Installation

2.1 Introduction

The MOD HUB can be either desktop mounted, panel mounted
or rack mounted. One model, the MODHUB-16F-N has its own
NEMA 1 enclosure for wall mounting.

2.2 Electromagnetic Compliance

The MOD HUB series complies with Class A radiated and
conducted emissions as defined by CFR 47 Part 15 and EN55022.
This equipment is intended for use in nonresidential areas. Refer
to the following notices in regard to the location of the installed
equipment.

Note:

with the limits for a Class A digital device, pursuant to Part 15
of the CFR Rules. These limits are designed to provide
reasonable protection against harmful interference when the
equipment is operated in a commercial environment. This
equipment generates, uses, and can radiate radio frequency
energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio
communications. Operation of this equipment in a residential
area is likely to cause harmful interference in which case the user
will be required to correct the interference at his own expense.

This equipment has been tested and found to comply

Warning

This is a Class A product as defined in EN55022. In a
domestic environment this product may cause radio
interference in which case the user may be required to take
adequate measures.

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