Andover Controls Infinity Configuration Guide

Download

Controlling Tomorrow’s World

Infinity Network Configuration Guide

Downloaded from - http://www.guardianalarms.net

Version B

Reproduction or distribution forbidden.

Subject to change without notice.

Order No. 30-3001-169

IMPORTANT NOTICE

This product is subje ct to c hange wit hout notice . Thi s documen t does not co nstit ut e any warranty , e xpress or implied. Andove r Co ntro ls Corp oration rese rves the rig ht t o alte r capa bi litie s, pe rforma nce, and prese ntati on of this product at any time.

The following trademarks are used in this manual: CROSSTALK is a registered trademark of Digital Communications Associates, Inc.

IBM PS/2, PC/AT, and NETBI OS are a reg i stered trademarks of I n ternational Bu siness Machines, Inc. MS-OS/2 is a trademark of Mic r osoft Corporation. VT is a trademark of Digital Equipment Corporation. ARCNET is a trademark of Datapoint Corporation. Ethernet is a trademark of Xerox Corporation.

ii Andover Controls Corporation

Preface

The Infinity Network Configuration Guide presents instructions for planning and in- stalling an ARCNET- or Ethernet-EnergyNet and multiple Infinets.

It first presents basic information on local area networks (LANs), then introduces the ARCNET-EnergyNet and how to set up an EnergyNet configuration. Next, it introduces the Ethernet-EnergyNet. It th e n presents information on Infinets, the smaller networks that branch off of the EnergyNet.

Finally, it presents how to interpret the LEDs on EnergyLinks and InfiLinks and how to interpret errors that may be related to t he network on the keypads of 900 or 810 controllers.

At the end is a glossary of LAN terminology that encompasses both ARCNET and Ethernet concepts.

Infinity Network Configuration Guide iii

iv Andover Controls Corporation

Chapter 1—Introducing Local Area Networks

What Is a Local Area Network? ......................................................................... 1-2

What Is a Controller? .................................................................................... 1-2

What Is a Workstation? ................................................................................. 1-2

What Is a File Server? ................................................................................... 1-2

What Is a Node? ............................................................................................ 1-2

What Is Network Topology? ............................................................................... 1-3

What Is Bus Topology? ................................................................................1-4

What Is Star Topology? ................................................................................1-4

What Is Ring Topology? ............................................................................... 1-6

What Are the Types of Active Hubs? ................................................................. 1-7

Modular Active Hubs ....................................................................................1-7

Non-modular Active Hubs ............................................................................ 1-7

Active Links .................................................................................................. 1-7

EnergyNet Active Hubs ................................................................................ 1-7

What Types of Cables Form LANs? ................................................................... 1-9

What Is Coaxial Cable? ................................................................................ 1-9

What Is Twisted Pair Cable? ........................................................................ 1-9

What Is Fiber Optic Cable? .......................................................................... 1-9

How Fast Is Data Transmitted? ........................... .......... .......... .......... .........1-10

How Is Data Transmitted on LANs? ................................................................1-11

What Is Token Passing? .............................................................................. 1-11

What Is CSMA/CD? ................................................................................... 1-11

What Are Signaling Methods? ............................................ .......... .......... .... 1-12

What Is Baseband? ...................................................................................... 1-12

What Is Broadband? .................................................................................... 1-13

What Is Carrierband? .................................................................................. 1-13

Advan tages of Ba seband O v er Broadb a n d .......... .................. .....................1-13

How Do You Establish Communication on LANs? .........................................1-14

What Are Software Drivers? ....................................................................... 1-14

What Is a Network Operating System? .......................................................1-14

Infinity Network Configuration Guide v

Chapter 2—Understanding ARCNET-EnergyNet

What Is ARCNET-EnergyNet? .......................................................................... 2-2

What Are the Nodes on ARCNET-EnergyNet? ...........................................2-2

Why Is Token Passing Effective? ................................................................. 2-3

What Is the Hub of ARCNET-EnergyNet? ........................................................ 2-4

What Are Components of EnergyLink 2000? ..............................................2-4

What Is the Active Link/Repeater of ARCNET-EnergyNet? .............................2-7

What Is the ARCNET-EnergyNet Network Interface Card? .............................. 2-8

Chapter 3—Selecting a Cabling Arrangement for ARCNET-EnergyNet

Preparing Coaxial Cables .................................................................................... 3-2

Forming Simple Bus Configurations .................................................................. 3-4

Point-to-Point Connections with Coaxial Cable ...........................................3-4

A Simple Coaxial Cable Bus Topology ........................................................ 3-5

A Coaxial Cable Bus Topology with Workstations ...................................... 3-6

Rules for All Coaxial Cable Bus Topology Networks ................................. 3-7

A Simple Coaxial Cable Star Topology ....................................................... 3-9

Switching Cable Types with EnergyLink 2000s ..............................................3-10

Fiber Optic Bus Topology with EnergyLink 2000s and 2101s ..............................3-10

Rules for Fiber Optic Networks .................................................................. 3-11

Employing EnergyLink 2000s in Complex Configurations ............................. 3-12

Distributed Star Topology with EnergyLink 2000s .................................... 3-12

Expanding the Network with EnergyLink 2000s ....................................... 3-14

Rules When Using EnergyLink 2000s in a Distributed Star Topology ...... 3-14

Cascading EnergyLink 2000s .....................................................................3-15

Extending a Bus with an EnergyLink 2000 ................................................ 3-16

Planning Your Cabling Configuration .............................................................. 3-17

Measuring Cable Lengths ........................................................................... 3-17

Selecting a Cable Type ............................................................................... 3-17

Calculating Total Delays on Long Networks ............................................. 3-18

Summary of Node Connection Rules for All ARCNET-

EnergyNet Topologies ........................................ .......... .......... .......... .......... ...... 3-19

Chapter 4—Understanding Ethernet-EnergyNet

What Is Ethernet-EnergyNet? ............................................................................. 4-2

What Are the Nodes on Ethernet-EnergyNet? .............................................. 4-3

Why Is the CSMA/CD Access Method Effective? ....................................... 4-4

What Is the Hub of Ethernet-EnergyNet? ........................................................... 4-4

What Are Components of EnergyLink 2500? ..............................................4-6

What Is the Ethernet-EnergyNet Network Interface Card? ........................ .. .... .. 4-9

vi Andover Controls Corporation

Chapter 5—Selecting a Cabling Arrangement for Ethernet-EnergyNet

Understanding Cable Types ................................................................................ 5-2

Characteristics of Unshielded Twisted Pair Cable .......................................5-2

Characteristics of Thick Coaxial Cable ........................................................ 5-3

Chara c t e r istics o f Th i n n e t Co a x i al Cable .......... .................. ........................ .5-4

Characteristics of Fiber Optic Cable ............................................................. 5-5

Summary of Characteristics of Cable Types ................................................ 5-7

Forming a Simple Point-to-Point Configuration with Twisted Pair Cable .........5-9

Twisted Pair (10Base-T) Ethernet-EnergyNet .............................................. 5-9

Forming a Star Configuration with Twisted Pair Cable ...................................5-11

Forming a Distributed Star Configuration with Twisted Pair Cable ................5-12

Rules for Twisted Pair Networks ................................................................ 5-15

Understanding Thin Coaxial Cable ................................................................... 5-16

Using Coa x i a l Ca b l e s ........... ........ ............... .............. .............. .............. ...... 5-16

Forming a Simple Two-Node Bus with Thin Coaxial Cable

Using T Con n e ct o rs ....... ........ .............. ............... ........ .............. .............. ........ .. 5 - 1 7

Expanding the Simple Bus with Thin Coaxial Cable Using T Connectors ...... 5-20

Lengthening the Thin Coaxial Cable Bus ......................................................... 5-21

Forming a Simple Bus with Thin Coaxial Cable Using Cable Taps ................ 5-23

Forming a Star or Distributed Star Configuration with

Thin Coaxial Cable Using EnergyLink 2500 ................................................... 5-27

EnergyLink 2500 as a Node on Each Bus ................................................ .. 5-31

Rules for Thin Coaxial Cable Distributed Star Topology Networks .......... 5-32

Forming a Two-Node Bus Configuration with Fiber Optic Cable ................... 5-34

Lengthening the Fiber Optic Bus ...................................................................... 5-36

Forming a Star Configuration with Fiber Optic Cable .....................................5-37

Connecting Fiber Optic Cable to EnergyLink 2500 ................................... 5-40

Cascading EnergyLink 2500s Using Fiber Optic Cable ............................. 5-42

Calculat ing Total Si g n al Lo ss .... ............... ........ .............. .............. ........ ...... 5-4 3

Rules for Fiber Optic Networks .................................................................. 5-44

Employing Multiple Cable Types in Long/Complex Networks ..........................5-45

Determining Total Network Length ...................................................................... 5-45

Calculating Total Delay on Long Networks ......................................................... 5-46

Employing Bridges in Long Networks ................................................................. 5-48

Using Local Bridges .............................................................................................. 5-48

Using Remote Bridges ........................................................................................... 5-48

Planning and Setting Up a Long Network ............................................................ 5-50

General Guidelines for Mixed-Cable Distributed Star

Topology Ethernet-EnergyNets ............................................................................. 5-60

Infinity Network Configuration Guide vii

Chapter 6—Understanding and Cabling Infinet

What Is Infinet? .................................................................................................. 6-2

What Are the Nodes on Infinet? ................................................................... 6-2

Why Is Token Passing Effective? ................................................................. 6-3

What Is the Twisted Pair Hub of Infinet? ........................................................... 6-4

What Is the Fiber Optic Link of Infinet? ............................................................ 6-5

Forming Twisted Pair Infinet Configurations .....................................................6-6

Extending the Infinet with InfiLink 200 ....................................................... 6-6

Employing InfiLink 200 in Star Configurations ................................................. 6-7

Using Modems with InfiLink 200 ................................................................6-7

Forming Mixed Fiber Optic and Twisted Pair Infinet Configurations ............... 6-9

Extending the Infinet with InfiLink 210 ....................................................... 6-9

Employing InfiLink 210 in an Extended Daisy-Chain ..................................... 6-11

Employing InfiLink 210 in Star Configurations ............................................... 6-12

Limiting Cable Signal Loss Over Fiber Optic Cable ..................................6-15

Planning Your Cabling Configuration .............................................................. 6-16

Infinet Map Drawing Conventions ............................................................. 6-16

Selecting a Cable Type ............................................................................... 6-17

Chapter 7—Interpreting LEDs on EnergyLinks and InfiLinks

Understanding EnergyLink 2000 LEDs ............................................................. 7-2

Interpreting Normal LED Responses ............................................................ 7-3

Interpreting Flashing Lights .......................................................................... 7-3

Responding When +PWR and –PWR LEDs Do Not Light Up .......................... 7-4

Understanding InfiLink 200 LEDs ..................................................................... 7-6

Interpreting Normal LED Responses ............................................................ 7-6

Baud Rate Setting on InfiLink 200 ...............................................................7-7

Checking Fuse on InfiLink 200 ....................................................................7-7

Understanding EnergyLink 2500 LEDs ............................................................. 7-8

Interpreting LED Responses ......................................................................... 7-8

Responding to Excessive Collisions ........................................................... 7-10

Understanding InfiLink 210 LEDs ................................................................... 7-11

Interpreting Normal LED Responses .......................................................... 7-11

Baud Rate Setting on InfiLink 210 .............................................................7-12

Understanding Keypad Errors on 900 or 810 ................................................... 7-13

Error 1 ........ .............. .............. ........ ............... .............. ........ .............. .......... 7-13

Error 2 ........ .............. .............. ........ ............... .............. ........ .............. .......... 7-13

Error 3 ........ .............. .............. ........ ............... .............. ........ .............. .......... 7-13

Error 4 ........ .............. .............. ........ ............... .............. ........ .............. .......... 7-13

Error 5 ........ .............. .............. ........ ............... .............. ........ .............. .......... 7-13

viii Andover Controls Corporation

Appendix A—RS-232 Port Pinouts for Controllers and Workstations Appendix B—Using Thick Coaxial Cable for Ethernet-EnergyNet

Forming a Simple Bus Configuration w ith Thick Coax ial Ca ble ..........................B-2

Using a Transceiver to Tap into Ethernet-EnergyNet ..................................B-4

Tapping Directly into Ethernet-EnergyNet ...................................................B-5

Installing Thick Coaxial Transceivers ..........................................................B-5

Lengthening the Thick Coaxial Cable Backbone ...............................................B-7

Rules for Thick Coaxial Cable Bus Topology Networks . ...... .......... .......... ..B-8

Appendix C—Totaling Propagation Delays for Ethernet-EnergyNet Appendix D—Mapping Conventions for Andover Networks

ARCNET-EnergyNet Map Drawing Conventions ............................................ D-2

Ethernet-EnergyNet Map Drawing Conventions ............................................... D-4

Glossary—LAN Terminology

Infinity Network Configuration Guide ix

x Andover Controls Corporation

Chapter 1 Introducing Local Area Networks

Local Area Networks

This chapter covers the following:

• What Is a Local Area Network?

• What Is Network Topology?

• Active Hub Types

• LAN Cable Types

• LAN Data Transmission

• LAN Communications

Infinity Network Configuration Guide 1-1

Local Area Networks

What Is a Local Area Network?

A local area network (LAN) is a minimum of two controllers or a controller and a workstation connected with cabling and running software.

The LAN lets multiple workstations and controllers communicate with (“talk to”) one another, sharing data, storage space, programs, printers, terminals, other software, and other equipment.

A LAN transmits data much faster than a point-to-point link, such as one over an RS-232C cable. Where RS-232C usually cannot transmit data faster than 19,200 baud, a LAN can transmit data at the rate of 1 to 10 Mb/sec, hundreds of times faster.

With a LAN you can also connect many different types of equipment, which is why a LAN is the perfect method for connecting a building control, process control, or security system network.

Also, while LANs do not usually extend beyond a mile in length, they can extend much further than an RS-232C connection.

What Is a Controller?

A controller is a computerized piece of equipment that you use to control an HVAC system, building access, or process.

What Is a Workstation?

A workstation is a computer complete with a screen and a built-in storage dis k that you use to access and modify the controller or controllers on your network.

What Is a File Server?

A file server is a workstation that stores files for other workstations or controllers on the network. You can store all your controllers’ programs on the file server if you choose.

What Is a Node?

Each workstation, file server, or controller of the LAN is called a “node.”

1-2 Andover Controls Corporation

What Is Network Topology?

Network “topology” is the way you arrange the nodes of the network and connect them with the cables. Three types of topology available on most LANs are as follows:

• Bus Topology

• Star Topology

• Ring Topology

What Is Bus Topology?

Bus topology is an arrangement of nodes on a single cable (also called a “bus”). Each node is connected to the bus with a connector. A bus sends each message to all nodes at once. This system of transmission is called a “broadcasting” system.

Figure 1-1. Bu s Topolo gy LAN. This is a “standa rd” Ener gyNet configuration.

LAN

Cable

Local Area Networks

Workstation

Controller

Nodes

Controller

Workstation

Infinity Network Configuration Guide 1-3

Local Area Networks

What Is Star Topology?

Star topology is an arrangement where all nodes are connected to a central hub that is a communications device.

You can add nodes to the network by connecting them to the central hub. After the LAN becomes active, you can still add another node. You can configure an EnergyNet in this topology.

Figure 1-2. St ar Topology LAN

Controller

Workstation

Central Hub

Controller

Workstation

1-4 Andover Controls Corporation

Controller

Local Area Networks

What Is a Central Hub?

A central hub in a star topology LAN is either a series of wires connected at one location (passive hub) or a communications device that transmits data to all nodes connected to it (active hub).

In simple terms, an active hub requires power to function, whereas a passive hub is merely a location where multiple wires connect.

An “active hub” is one that acts like a “network repeater,” an electronic device that retransmits signals that have traveled a long distance. It regenerates signals over distances of up to 6,561 ft (2,000 m). Active hubs let you isolate networ k nodes so that if an error occurs on one node or noise interferes with the functioning of one cable, the rest of the network is minimally affected.

A “passive hub” is one that merely connects several nodes, but does not retransmit signals. In a passive hub, you must use all ports on the hub, or properly terminate them.

If one node or one port on a passive hub is not terminated, the entire network is disrupted. Under such a system, you could not isolate a network node. Problems on one node would reverberate over the network.

So that you can easily remove nodes from the network, Andover

Controls supports only active hubs.

Infinity Network Configuration Guide 1-5

Local Area Networks

What Is Ring Topology?

Ring topology is an arrangement of nodes in a single continuous loop. Data transmits from node to node in one particular direction. The ring topology is not supported by EnergyNet because if a single node fails, the entire network fails.

Figure 1-3. Ring Topology LA N

Workstation

Controller

Never attempt to form a ring topology with EnergyNet.

1-6 Andover Controls Corporation

Workstation

Active Hubs Types

The following are the most common types of active hubs used in star topology networks:

• Modular Active Hubs

• Nonmodular Active Hubs

• Active Links

Modular Active Hubs

Also called “variable port hubs,” modular active hubs let you determine how many ports you want connected to them. You insert a module with the number and type of ports you want into one of the connectors on the hub.

The modules can be for various types of cables, so you can have fiber optic cable on one module, coaxial cable on another, and so on—all connected at one hub.

Nonmodular Active Hubs

Local Area Networks

Also called “fixed port hubs,” nonmodular active hubs have a fixed number of ports, usually eight. To connect more than eight nodes to a network using nonmodular active hubs, you cascade other hubs from a port on one hub to a port on another.

Active Lin ks

You can use an active link as either a repeater or as an interface to switch to another type of cabling.

When you’ve reached your maximum cable length on a bus, you can use a repeater to extend the cabling a further distance.

You can use another type of active link to switch from fiber optic cabling to coaxial cabling or twisted pair cabling. (For more on cabling, see the next section, What Types of Cables Form LANs?)

EnergyNet Active Hubs

Andover Controls has two active hubs, one for an ARCNET-EnergyNet and the other for an Ethernet-EnergyNet.

EnergyLink 2000 (ARCNET-EnergyNet)

EnergyLink 2000 is the Andover Controls modular active hub for an ARCNET- EnergyNet networking 9000 and 9500 controllers. It can have up to four modules

and up to 16 ports. You use EnergyLink 2000 as either an active hub or a multiport cable-switching active link. To use it as a cable-switching active link, you would replace some of the modules with modules for a different cable type.

Infinity Network Configuration Guide 1-7

Local Area Networks

You can also extend the network length with an EnergyLink 2100 as a network repeater. Or you can purchase EnergyLink 2101(for both coaxial and fiber optic cable) as either a network repeater or an active link for cable switching.

Essentially, EnergyLink 2100 and 2101 are active hubs with only four ports. You’ll find out more about EnergyLink 2000, EnergyLink 2100, and EnergyLink

2101 in the next chapter.

EnergyLink 2500 (Ethern et-EnergyNet)

EnergyLink 2500 is the Andover Controls modular active hub for an Ethernet- EnergyNet networking 9200 and 9300 controllers. It can have up to seven modules,

each with a single port. You use EnergyLink 2500 as both an active hub and a multiport cable-switching hub. To use it as a cable-switching hub, you use modules for various different cable types.

You’ll find out more about EnergyLink 2500 in subsequent chapters.

1-8 Andover Controls Corporation

LAN Cable Types

Three types of cable form LAN connections:

• Coaxial

•Twisted Pair

• Fiber Optic The type of cable you should use often changes with the particular circumstances

of your installation.

What Is Coaxial Cable?

Coaxial cable is a shielded cable and is the most commonly used cabling for LANs because its shield protects data being transmitted from outside noise. Shielding is necessary when running cables through equipment rooms where HVAC controllers reside. It offers the best noise protection at the lowest cost.

What Is Twisted Pair Cable?

Local Area Networks

Twisted pair cable is an unshielded and less expensive cable than coaxial. It is sometimes the choice in a low noise environment or for use with Ethernet networks. However, data transmits less reliably over twisted pair cabling and the controller must often retransmit the data. Although it is perfectly acceptable for EthernetEnergyNet, because it is less reliable than other types of cable, we do not recom- mend or support twisted pair cabling for ARCNET-EnergyNet.

What Is Fiber Optic Cable?

Fiber optic cable is a shielded cable and o ften used where the LAN requires outdoor cables. Fiber optic cable is used to protect against lightning damage and other electrical disturbances. It offers the best noise protection possible, but at a high cost.

Table 1-1. Compared Characteristics of Coaxial, Fiber Optic, and Twisted Pair Cabling

Characteristic Coaxial Twisted Pair Fiber Optic

Installed Cost Low Low High Distance Medium Low High Topologies Star, Bus Star, Bus Star Noise Immunity Medium Low High Outdoor Use Good Poor Excellent Transmit Speed Medium Low High

Infinity Network Configuration Guide 1-9

Local Area Networks

How Fast Is Data Transmitted?

Each of the three types of cables transmits data at different rates:

• Coaxial—Between 1 and 15Mb/sec.

• Twisted Pair—Maximum of 10Mb/sec.

• Fiber Optic—200 Mb/sec. ARCNET-En ergy Net transmits data at a rate of 2.5Mb/sec. Ethernet-EnergyNet

transmits data at 10 Mb/sec. Although one may appear to have obvious advantage over the other, you may want to consider some of the other differences between ARCNET and Ethernet before you choose which one to use in your installation.

1-10 Andover Controls Corporation

LAN Data Transmission

Each node on the network accesses the network to transmit and receive data. The method of access is a set of rules called “protocols.” Two types of protocols used on LANs are as follows:

• Token Passing

• Carrier-Sense Multiple Access with Collision Detection

(CSMA/CD)

What Is Token Passing?

The token is an electronic signal. Token passing access sends a single token to each node. The token checks to see if the node has data to transmit. The network passes the token sequentially, from node to node.

One node receives the token and immediately transmits any data it wants to submit. The data broadcasts over the network to all other nodes, but only the node that should receive it responds to it. The network then passes the token along to the next node where the process repeats. If a node has no data to transmit, it merely passes the token to the next node.

Local Area Networks

Under the token passing system, each node on the network is an equal. No single central controller or workstation is required. For this reason, the length of time required to pass a piece of data through the token passing system is always consistent for a given data size. For example, all messages that are 10 bytes transmit in the same number of seconds. If the message is longer, it takes more time, shorter, it takes less time. Heavy network traffic (network activity) does not slow down the rate data transmits at.

Another advantage to token passing is that should a node fail, the network automatically skips it when passing the token, so that communication continues among all nodes that are functioning.

Similarly, when you add a new node to the network, the network automatically recognizes that node and passes the token to it at its time in the sequence.

If you cut the network into two parts, each automatically becomes a separate network. Breaking the network becomes a useful tool when troubleshooting.

Both ARCNET-EnergyNet and Infinet are token passing access networks. For the most efficient token-passing network, Andover recommends you use up to 50 controllers on ARCNET-EnergyNet.

What Is CSMA/CD?

CSMA/CD networks bring messages onto a cable “highway.” Just as on an automobile highway, as long as traffic is normal, cars (nodes) can cut into the flow easily.

Infinity Network Configuration Guide 1-11

Local Area Networks

As long as the quantity of traffic is correct for that network highway, information moves readily along the network paths from node to node.

However, when traffic builds up, as in downtown rush hour, the cars must compete to be the first in line. The same happens on a CSMA/CD network when the traffic builds up. Whenever the active node (car) pauses, another node must cut it off and force its way in to gain access to the network. Thus, when traffic is heavy, CSMA/ CD network nodes compete for access to the network.

In extreme cases, cars become bottlenecked trying to get into the same narrow street and it becomes impossible to get in. The same can occur on a CSMA/CD network, so that in excessively heavy network traffic, some messages may not transmit as quickly as they ought to.

Also, in traffic jams there are sometimes collisions. The same can occur on the network. Network collisions are not fatal, and after they occur, the nodes whose data collide simply pause and try once again to get onto the network highway.

As you have probably figured out, in heavy traffic, you might have a hard time estimating the time required to transmit a piece of data over a CSMA/CD access network. However, on this type of network, the size of the data does not influence the rate at which it is tr ansmitted. Since network traffic increases as you add nodes to the network, CSMA/CD access networks are practical as long as the volume of traffic is not extremely high. The highest traffic networks might achieve better results using token passing.

Ethernet-EnergyNet is a CSMA/CD network that you might choose for EnergyNets with up to 50 controllers.

One of the best reasons to choose Ethernet, as dis cussed earlier, is speed. At 10 Mb/ sec, Ethernet is considerably faster than an ARCNET operating at 2.5 Mb/sec. In the right installation, Ethernet is a reasonably priced alternative, because you can form it using twisted pair cable, the lowest-priced cable available for a LAN.

What Are Signaling Methods?

Three methods of transmitting data on LANs are as follows:

• Baseband

• Broadband

• Carrierband Each method uses a different type of signal.

What Is Baseband?

Baseband networks transmit either analog or digital signal s over the cabling system on a single channel. The baseband system encodes digital signals in pulse form be-

1-12 Andover Controls Corporation

Local Area Networks

fore entering the cable and decodes them back to their digital for m when they reach the destination node. EnergyNet is a baseband network.

What Is Broadband?

Broadband networks send data over tot ally separate channels depending on the type of data it is. They can transmit voice over one channel and video over another, using digital and analog signals as required.

Before a broadband network sends a signal, it modulates the signal into noninterfering frequencies through a radio frequency (RF) modem. When it the signal reaches its destination, the broadband demodulates the signals back to their digital or analog form.

What Is Carrierband?

Carrierband is like a single channel on a broadband network. It requires a modem and modulates the signal when it sends it out, but does not demodulate the signal when it reaches its destination.

Advantages of Baseband Over Broadband

Although broadband networks are flexible in transmitting signals, they are difficult to add a node to. You must reengineer the portion of the broadband network you want to add the node to.

Baseband networks, on the other hand, are easy to install and add nodes to. You never need to reengineer the network when adding a node.

Also, baseband networks require only a few components that almost anyone can assemble, while broadband networks require many more components and engineering expertise to install.

Infinity Network Configuration Guide 1-13

Local Area Networks

LAN Communications

After you have connected your network with the appropriate cables, how do you actually get the controllers and workstations talking? You use two types of software:

• Software Drivers

• Network Operating System

What Are Software Drivers?

Software drivers provide the instructions to transmit data over the network. The ARCNET-En ergy Net software driver is a NETBIOS c ompatible driver. The Ethernet-EnergyNet software driver is a NETBEUI compatible driver. NETBIOS and NETBEUI are standard drivers used by common network operating systems.

What Is a Network Operating System?

The network operating system is the software that lets workstations and controllers on a network share hardware resources, such as disk drives and printers.

Two types of environments exist in the operating s ystem: shared resource and peerto-peer.

A shared resource environment has a file server that distributes data as required to the nodes on the network. The software on each node accepts requests from the users and sends those requests to the file server whenever required. EnergyNet has the Microsoft OS/2 LAN Manager for its network operating system whenever workstations are on the network.

When two controllers communicate with each other (without a workstation), they use the peer-to-peer environment. They do not have a central file server. Instead, nodes access files through Andover network protocols. Protocols are rules that govern communication on the network.

Andover Controls combines shared resources and peer-to-peer communication forming a unique environment for building control. Andover Controls equipment uses shared resources for graphics and long term storage and peer-to-peer for controller to controller data exchange.

1-14 Andover Controls Corporation

Chapter 2 Understanding ARCNET-EnergyNet

ARCNET-EnergyNet

This chapter covers the following:

• What Is ARCNET-EnergyNet?

• What Is the Hub of ARCNET-EnergyNet?

• What Is the Active Link/Repeater of ARCNET-EnergyNet?

• What Is the ARCNET-EnergyNet Network Interface Card?

Infinity Network Configuration Guide 2-1

ARCNET-EnergyNet

What Is ARCNET-EnergyNet?

The ARCNET EnergyNet1 is a high-performance, token-passing local area network (LAN) of Andover Controls controllers and workstations and the network software that makes them communicate. Over a million ARCNET nodes are currently installed worldwide.

The ARCNET-EnergyNet network drivers are NETBIOS. The workstations on the network communicate through the operating system, the Microsoft OS/2 LAN Manager software. The LAN Manager uses a shared resource environment, with a file server serving all other workstations on the network.

ARCNET-En ergy Net has a minimum of two controllers or a controller and a workstation, usually connected with RG-62/u coaxial cable. It can connect up to 254 nodes. Data transmits over the ARCNET-EnergyNet at a rate of 2.5 Mb/sec when you use coaxial cable. Depending on your particular installation, you may want to use fiber optic combined with coaxial cabling instead. You can use both types to construct ARCNET-EnergyNet.

Although ARCNET-EnergyNet has a token-passing data access syst em, it has a combination bus and star topology called “distributed star” topology.

ARCNET-EnergyNet is a baseband network, connected by up to 4 miles (6.4 km) of coaxial cabling. The number of nodes on the network inf luences the length of c able that connects the entire network, but the maximum distance you can have between two nodes is 1,428 ft (435 m) with coaxial cabling and 6,000 ft (1,828.8 m) with fiber optic cabling.

As with any baseband network, ARCNET-EnergyNet is easy to install. It requires only cabling and interface modules. You may also use EnergyLink 2100 or 2101, electronic repeaters, to extend the amount of cabling beyond the limit for a given number of nodes. EnergyLink 2100 (or 2101) amplifies and retransmits signals so that they can travel further on the network.

What Are the Nodes o n ARCNET-Ener gyNet?

The two types of nodes on ARCNET-EnergyNet are controllers and workstations. The 9000 and 9500 controllers are ARCNET-EnergyNet controllers. (Other con-

trollers, called Infinet controllers, are not directly connected to the ARCNETEnergyNet. See Chapter 6 for more o n the Infinet controller network.) Each 9000 controller counts as a single node on ARCNET-EnergyNet. You give an ID to each controller by setting a DIP switch inside it. How to set the EnergyNet ID is in the installation guide for the 9000 controllers.

1. ARCNETControl s s o ftwa re.

2-2 Andover Controls Corporation

EnergyNet

is ARCNET, developed by Datapoint Corporation, combined with Andover

ARCNET-EnergyNet

The 8000 workstation is a user-friendly IBM PC workstation with detailed color graphics that connects to the network. The 8000 workstation can also be a file server, storing files for other workstations on the ARCNET-EnergyNet. You can program all your controllers from a single workstation that operates as a file server, if you choose. Each workstation or server counts as a single node on ARCNETEnergyNet. You give each workstation an ID by setting a switch on its network interface card. How to set the switch is detailed in the ins tructions you received with the card.

Each active hub is also considered a node on the network. You set the ID of the hub as described in the EnergyLink Installation Guide.

Why Is Token Passing Effective?

Token passing, as discussed in Chapter 1, is one of the best methods for real-time building control systems because data of a particular length is always transmitted in a given amount of time. Token passing allows ARCNET-EnergyNet to not only accept data of any length, but also automatically acknowledge receiving data and automatically check for errors, giving all nodes equal access to the network.

ARCNET-EnergyNet handles all network control so that 9000 and 8000 software can ignore network control and operate more efficiently.

If you remove a controller or workstation from the network, the ARCNETEnergyNet automatically reconfigures itself and continues operating without interruption.

Infinity Network Configuration Guide 2-3

ARCNET-EnergyNet

What Is the Hub of ARCNET-EnergyNet?

The hub of ARCNET-EnergyNet is EnergyLink 2000. EnergyLink 2000 is a 16-port modular active hub that retransmits messages to the

spokes (arms) of the hub just the way an electronic network repeater would. The hub has four modules, with four ports each. You can have coaxial, fiber optic,

or mixed coaxial and fiber optic modules on the EnergyLink 2000. Because you can interchange modules, you can have EnergyLink 2000 function as a cable switching center, if you connect the appropriate modules to it.

You do not have to terminate unused ports on the EnergyLink 2000. Because the ports are always properly terminated, you can later disconnect one node from the network without interrupting the building control system.

When EnergyLink 2000 connects several nodes, it controls communication on two fronts:

• Between the nodes in the star.

• Between the nodes in the star and the other hubs on the network. Because each node has a separate transceiver, you do not encounter problems with

cable loading. See also the EnergyLink 2000 Installation Guide supplied with the unit.

What Are Components of EnergyLink 2000?

Figure 2-1. EnergyLink 2000 Before Modules are Connected

6 inches (15.24 cm)

Where Four Modules Connect

2-4 Andover Controls Corporation

ARCNET-EnergyNet

You can mount the EnergyLink 2000 inside another NEMA enclosure or mount it on a wall as is.

When you first see EnergyLink 2000, you see four slots. You insert a module with four ports in each those slots. Then you have 16 ports in all. If you need only 12 ports, you need only use three modules.

When you order EnergyLink 2000, you order at least one module with either all four ports coaxial, all four ports fiber optic, or two ports coaxial and two ports fiber optic. To order EnergyLink 2000 and the modules, use the following Andover Controls model numbers:

• Andover Controls Model # 2000—16 port hub (115/230V 50/60 Hz)

• Andover Controls Model # 2001— Module with 4 coaxial ports

• Andover Controls Model # 2002— Module with 2 coaxial ports, 2 fiber optic ports

• Andover Controls Model # 2003—Module with 4 fiber optic ports

You can order a maximum of four modules per hub. Figure 2-1 shows ports on the modules. Each coaxial port connects to the male end

of a BNC connector and each fiber optic port connects to the end of a fiber optic cable.

Figure 2-2. Ports for Different Cables on Various Modules

Four Coaxial Ports on Module

Two Coaxial, Two Fiber Opt ic

Four Fiber Optic Ports on Module

Ports on Module

Although the hub behaves the way a repeater would, you would not want to use it as a repeater, because you would not take advantage of the 16 ports. Andover Controls has a repeater with four coaxial ports called EnergyLink 2100. If you want to

Infinity Network Configuration Guide 2-5

ARCNET-EnergyNet

switch from coaxial to fiber optic cable, you can pur chase the EnergyLink 2101 active link, with two coaxial and two fiber optic cable ports.

How Do You Read EnergyLink 2000’s LEDs?

EnergyLink 2000 also has LED lights on top that correspond to each module. The LEDs to the right of the rightmost module are for timing and reconfiguration. The timing light indicates ARCNET-EnergyNet is receiving and transmitting signals. The reconfiguration light turns on to indi cate that the network has been configured. The network reconfigures itself when you remove a node.

The activity LEDs on the rest of the modules blink to indicate that ports on that module are receiving and transmitting data. See Chapter 7 or the EnergyLink Instal- lation Guide for more details on how to interpret the LEDs.

2-6 Andover Controls Corporation

ARCNET-EnergyNet

What Is the Active Link/Repeater of ARCNETEnergyNet?

A small-scale version of the EnergyLink 2000, the EnergyLink 2100 has a single module with four coaxial ports and acts as a network repeater. You can also use it as a hub for three or four nodes that all require coaxial cable.

EnergyLink 2101 has a single module with two coaxial and two fiber optic ports. You often use it as a cable-switching active link. It can also be a network repeater for either a coaxial or fiber optic cable bus.

To order EnergyLink 2100 or 2101, use the following Andover Controls model numbers:

• Andover Controls Model # 2100—4 coaxial port active link/repeater

• Andover Controls Model # 2101—2 coaxial and 2 fiber optic port active link

In some instances, you can interchange EnergyLink 2100 with EnergyLink 2000. It is, basically, a hub with fewer ports.

In other instances, such as when you switch cable types, you can interchange EnergyLink 2000 with EnergyLink 2101. Both can also be the central hub of a star with mixed cable types, but the EnergyLink 2101 would form only a three- or fourarm star.

Infinity Network Configuration Guide 2-7

ARCNET-EnergyNet

What Is the ARCNET-EnergyNet Network Interf ace Card?

ARCNET-EnergyNet supports two network interface cards that let you connect workstations to the network:

• Andover Controls Model # 2020 for AT bus systems (IBM PC and Compaq computers)

• Andover Controls Model # 2040 for IBM PS/2 bus systems

See your Andover Controls Representative for specific hardware supported. Because the network interface card is considered a node on the

ARCNET-EnergyNet, it must have an EnergyNet ID, just as all other nodes on the network have.

You select the EnergyNet ID by setting a DIP switch inside the controller cabinet. You can assign each node an ID from 1 to 254. EnergyNet ID number 0 is reserved by ARCNET-EnergyNet to broadcast a message to all nodes. Otherwise, you can use any of the other ID numbers for any node or network interface card.

To assign the AT bus (Compaq) card an ID, set a DIP switch on it following the instructions provided with the card. To assign the PS/2 card an ID, you set it through the software. Details on how to set the PS/2 card ID are included in the computer’s documentation for the Reference disk.

EnergyNet IDs for 9000 controllers range from 1 to 223 and for 8000 workstation range from 224 to 254.

When passing the token from node to node, ARCNET-EnergyNet starts with the node with the lowest EnergyNet ID number and proceeds to the one with the highest. When it reaches the highest ID number, ARCNET-EnergyNet returns to the lowest, proceeding in a cycle called a “logical ring.”

As shown in the figure on the next page, the logical r ing is based on the EnergyNet ID number, not on the physical placement of the nodes.

2-8 Andover Controls Corporation

Figure 2-3. Logical Ring vs. Physical Layout of Nodes

ARCNET-EnergyNet

Logical Ring

230

Layout of Nodes on Network

230

8000 Workstation

9000 Controller

224

126

224

126

9000 Controller

8000 Workstation

9000 Contro lle r

Infinity Network Configuration Guide 2-9

ARCNET-EnergyNet

2-10 Andover Controls Corporation

Cabling Configuration for ARCNET

Chapter 3

Selecting a Cabling Arrangement for ARCNETEnergyNet

We recommend you read all of the information in this chapter before designing your own ARCNET-EnergyNet configuration. This chapter covers the following:

• Preparing Coaxial Cables

• Forming Simple Bus Configurations

• Switching Cable Types with EnergyLink 2000s

• Employing EnergyLink 2000s in Complex Configurations

• Planning Your Cabling Configuration

• Summary of Node Connection Rules for All Topologies

Infinity Network Configuration Guide 3-1

Cabling Configuration for ARCNET

Preparing Coaxial Cables

No matter which type of network topology you use, each length of coaxial cable connecting to a controller, workstation, EnergyLink 2000, EnergyLink 2100, or EnergyLink 2101 must have a BNC male connector at both ends. If the cables are not already premade, you prepare them by attaching the male connectors.

If possible, you should use premade cables, because when creating your own, you could inadvertently cut a single wire too short, or twist or break a wire. If a single wire is not properly connected, you later have communications problems that may be difficult to diagnose.

Figure 3-1 shows a single piece of prepared coaxial ARCNET-EnergyNet cable. Each piece of coaxial cable from male connector to male connector must be at least 6 ft (1.82 m) long.

Figure 3-1. ARCNET-EnergyNet Coaxial Cable

6 ft. (1.82 m)

minimum

Male Connectors on either end of Coaxial Cable —Each connects directly to controllers at ends of bus

Figure 3-2 shows the ARCNET-EnergyNet coaxial T connector (Andover Controls Model # 2070). This connector is required on most (but not all) controllers on a bus. (More about buses later.)

Figure 3-2. ARCNET-EnergyNet Coaxial T Connector

Coaxial Cable

Connects to coaxial connector on a controller

not

at end of bus

3-2 Andover Controls Corporation

Cabling Configuration for ARCNET

Figure 3-3 shows the coaxial ARCNET-EnergyNet cable co nnecting to t h e T connector.

Figure 3-3. ARCNET-EnergyNet Coaxial Cable Connections

Connects to Controller or Workstation

Male BNC Connector

BNC T Connector

Prepared Cables

Connect to Another Node and Connects directly to controller at end of Bus

Plug the end of the coaxial T connector for the ARCNET-Energy Ne t c ab le into the ARCNET-EnergyNet connector just above and to the left of the uppermost RS-485 port on the controller board. (Or directly connect the male BNC connector to the controller if it is at the end of a bus. See the next section for details on buses.)

Every T connector on the network has three ends. The bottom of the T always connects to the coaxial connector on a controller or workstation on the network. The two sides of the T connector always connect to a coaxial cable.

Infinity Network Configuration Guide 3-3

Cabling Configuration for ARCNET

Forming Simple Bus Configurations

Let’s look at a series of simple configurations first.

Point-to-Point Connections with Coaxial Cable

Suppose you want to connect two 8000 workstations, two 9000 controllers, or one of each. To connect two nodes point-to-point, you must first terminate the nodes.

Each controller is terminated when you purchase it, with a built-in removable 93 Ω terminator.

Figure 3-4 shows the built-in terminator in upper left corner of the printed circuit board inside the 9000 controller.

Figure 3-4 . Built-i n Te rminator on 90 00 C ont roller

Fuse for

2000

Built-in Removable 93 Ω Terminator

EnergyLink

Power

Capacitor

•

EnergyLink 200 0

Connection

Power

in Pico Fuse Socket

Coaxial Cable Connection

Each workstation can be terminated with a jumper on its network interface card. To form the two-node network, terminate the workstation (see the card instructions) and connect the two nodes. Connect the male BNC connector on the coaxial cable directly to the workstation’s network interface card.

Figure 3-5 shows a simple point-to-point connection with no hub in the simplest bus topology.

3-4 Andover Controls Corporation

Cabling Configuration for ARCNET

Figure 3-5. Two-Node Point-to-Point Connection

Workstation Has Jumpered Interface Card Terminator

Controller Has Built-in Terminator

9000 Controller

8000 Workstation

A Simple Coaxial Cable Bus Topology

If you want to join three nodes, you could join three 9000 controllers in a bus topology, as long as you leave the terminator in tact at both ends of the bus and remove it from the node(s) in between.

The bui lt- in 93 Ω term inat or i s in a pi co fuse so cke t. When yo u do not want to terminate a controller, remove the terminator from the socket.

Figure 3-6 shows three controllers in a bus topology network.

Figure 3-6. Three -N o de Bus To pology with Ter m in at ors

9000 Controller

9000 Control le r

(Terminator Removed)

With coaxial cabling, you can connect up to 19 contr ollers ( 9000s ) on one continuous bus, as long as you terminate the network properly on both ends and keep the length requirements.

Rule for Using Connectors and Terminators on Coaxial ARCNET-EnergyNet: Always direct connect controllers at the end of a bus with a male connector and

leave the terminator on the board in tact. Always connect controllers in the middle of a bus with a coaxial T connector and

remove the terminator from the board.

Infinity Network Configuration Guide 3-5

Cabling Configuration for ARCNET

A Coaxial Cable Bus Topology with Workstations

You can also have a bus topology network with an 8000 workstation on either end. In this configuration, whether or not you need a terminator on the end of the bus depends on the kind of network interface card each workstation has:

• With the AT card, you can terminate the connection by jumpering the appropri-

ate terminal on the card to form a terminator right there on the card. (See the card instructions.)

• With the PS/2 card, you must terminate the bus by connecting a

93 Ω terminator to the open end of the T connector.

If you have all IBM or Compaq workstations on an AT bus, you can select those that terminate the network and jumper their cards. When you do this, connect the male BNC connector on the coaxial cable directly to the network interface card.

You terminate the workstation with a PS/2 card by attaching a 93 Ω connector to the open end of the coaxial T connector.

Figure 3-7 shows the terminated T connector on a PS/2 card.

Figure 3-7. Coaxial T Connector Terminated for PS/2 Card

93 Ω Terminator connects to a coaxial T connector to

Coaxial Cable

terminate PS/2 card

Connects to coaxial connect or on con troller

3-6 Andover Controls Corporation

Cabling Configuration for ARCNET

Figure 3-8 shows how two workstations with jumpered terminators form the ends of a three-node bus topology network.

Figure 3-8. Three-Node Bus Topology with Jumpered Termi nato rs on Workstati ons

9000 Controller

8000

Workstation

8000

Workstation

with Jumpered

with Jumpered Terminator

Terminator

Rules for All Coaxial Cable Bus Topology Networks

You must adhere to the following when creating an all coaxial cable bus topology ARCNET-En ergy Net:

• Terminate the bus at both ends by leaving the 93 Ω terminator in tact on the controllers. You can terminate a workstation by setting the jumper on the workstation network interface card.

• Connect male connectors directly to the network interface card on workstations without a T connector if terminated on a jumper on the card.

• Use only Andover Controls T connectors (Andover Controls Model # 2070).

• Keep the length of a bus connection at a maximum of 1,000 ft (304.8 m) for eight nodes and decrease or increase it proportionally for more or fewer nodes (see table on next page).

• Keep the maximum number of nodes to 19 with a length of the bus cable limited to 200 ft (60.96 m).

• Be sure each piece of cable from node to node is a minimum of 6 ft (1.82 m) long.

Infinity Network Configuration Guide 3-7

Cabling Configuration for ARCNET

We do not recommend using more than 19 nodes on a single bus. Table 3-1 shows the amount of cable allowed for from two to 19 nodes. Remember,

the general rule is eight nodes per 1,000 ft (304.8 m) of cable.

Table 3-1. ARCNET-EnergyNet Bus Cable Length vs. Number of Nodes

Nodes Maximum Cable Length

2 1,428 ft (435.25 m) 3 1,356 ft (413.30 m) 4 1,285 ft (391.66 m) 5 1,213 ft (369.72 m) 6 1.141 ft (347.77 m) 7 1,070 ft (326.13 m) 8 998 ft (304.19 m)

9 926 ft (282.24 m) 10 855 ft (260.60 m) 11 783 ft (238.65 m) 12 711 ft (216.71 m) 13 640 ft (195.07 m) 14 568 ft (173.12 m) 15 496 ft (151.18 m) 16 425 ft (129.54 m) 17 353 ft (107.59 m) 18 281 ft (85.64 m) 19 210 ft (64 m)

You can extend the length of cable for a particular number of nodes using EnergyLink 2100.

3-8 Andover Controls Corporation

Cabling Configuration for ARCNET

A Simple Coaxial Cable Star Topology

If you try to form a three-node network by tying the three nodes together at one point in a star topology, you add a passive hub or either an EnergyLink 2100 or an EnergyLink 2000.

Figure 3-9 shows a three-node star topology with a hub. In this configuration, where you use an EnergyLink 2000 or EnergyLink 2100, you must terminate all workstations or controllers, because the hub acts as a node at the end of a bus. So all nodes on this network must have terminators.

Figure 3-9. Three-Node Star Topology wi th a Hub

Maximum

Length Bus

Cable Is

200 ft.

(50.96 m)

for Passive

Each Arm Off the Hub Is Like a Bus

EnergyLink 2000 2100

Hub or

Active

Link

ub, 1428 ft.

(435.25 m)

Energy-

for

Link 2000

Energy-

Link 2100

9000

Controller

8000

Workstation

Workstatio

8000

Because after three nodes, the passive hub becomes extremely unreliable, Andover does not recommend you use passive hubs.

Also, since the maximum length cables you should use with a passive hub is between 100 and 200 ft, using a passive hub would restrict your network. If you use an EnergyLink 2000 instead, you can extend cable 1428 ft (435.25 m) between nodes. Remember, if you remove a node from a passive hub, the entire network is disrupted. So, even in a simple star topology where long cabling is not required, we recommend EnergyLink 2000s or EnergyLink 2100s for the greatest flexibil ity and reliability. See the section called Employing EnergyLink 2000s in Complex Configurations.

Infinity Network Configuration Guide 3-9

Cabling Configuration for ARCNET

Switching Cable Types with EnergyLink 2000s

Fiber Optic Bus Topology with EnergyLink 2000s and 2101s

Andover Controls recommends you use glass fiber optic cable for running ARCNET-EnergyNet cable outdoors or through a high-noise environment. You may choose to form an entire bus of fiber optic cable or merely extend a coaxial network between buildings with fiber optic cable.

How do you connect fiber optic cable to a controller with coaxial connector on its board? You use EnergyLink 2000 with modules for both coaxial and fiber optic ca- ble. Or you use an EnergyLink 2101 because it has two coaxial and two fiber optic ports. You’ll need one EnergyLink 2000 or EnergyLink 2101 for each controller or workstation on the fiber optic bus. Connect each as follows:

1. Connect one end of a prepared coaxial cable to a coaxial port on the EnergyLink 2000 or EnergyLink 2101.

2. Connect the other end of the prepared coaxial cable to one side of the T connector on the controller or to the network interface card of a workstation.

Be sure to run a minimum of 6 ft (1.82 m) of coaxial cable from the controller or workstation to the EnergyLink 2101 (or EnergyLink 2000).

3. Be sure the built-in terminator is in place on each controller and that each workstat ion’s netwo rk interfac e c ard is jumpe red to termina te it.

4. Run glass fiber optic cable from a port on one EnergyLink 2101 (or EnergyLink 2000) to a port on the next EnergyLink 2101 (or EnergyLink

2000).

Figure 3-10 shows a three-node fiber optic bus topology with EnergyLink 2101s.

Figure 3-10 . Three-Node Fiber Opt ic Bus Top ology

Fiber Optic Cable

EnergyLink 2101

Minimum 6 ft. (1.82 m) Coaxial Cable

9000 Controller

3-10 Andover Controls Corporation

8000 Workstation

8000 Workstatio n

Cabling Configuration for ARCNET

Rules for Fiber Opt ic N et wo rks

If you choose to employ fiber optic cable be sure you meet the following criteria:

• Follow National Electrical Code (NEC) restrictions if running cable through HVAC plenums or ducts. You can use Teflon-coated cable in this situation if the code requires it.

• Be sure the amount of cable between nodes does not exceed 6,000 ft. (1,828.8 m) (See also the table at the end of this chapter.)

• If cable between nodes must exceed 6,000 ft (1,828.8 m), then use EnergyLink

2101 as a repeater. See the section called Extending a Bus with an EnergyLink 2000 later in this chapter.

• Be sure the overall network does not exceed 20,000 ft (6,096 m).

An EnergyLink 2000 is somewha t like a network r epeater because it retransmits s ignals, so you can also use it to extend the length of the fiber optic bus.

You can also use other EnergyLink 2000s to expand the number of nodes on the network. For more information on using EnergyLink 2000s, see the section called Employing EnergyLink 2000s in Complex Configurations.

Infinity Network Configuration Guide 3-11

Cabling Configuration for ARCNET

Employing EnergyLink 2000s in Complex Configurations

Distributed Star Topology with En ergyLink 2000s

The most flexible way to add 8000 workstations or 9000 controllers to ARCNET- EnergyNet is through an EnergyLink 2000 or similar model.

EnergyLink 2000s allow you to expand your network much further than buses or

passive hubs would allow. You use several EnergyLink 2000s for groups of nodes and cascade the hubs togeth-

er, forming “buses” between them. Each single arm of the star is also a bus and can have up to seven nodes on 1,000 ft (304.8 m) of coaxial cable (EnergyLink 2000 is the eighth node). This combination of bus and star topology for ARCNETEnergyNet is called a “distributed star” topology.

Figure 3-11 shows an all coaxial cable distributed star topology.

Figure 3-11. Coaxial Distribut ed S ta r Topology Netw or k

EnergyLink 2000

Coaxial Buses Cascading

EnergyLink 2000

Each Arm ("Spoke")

EnergyLink 2000

Is Like a Bus

Each Arm ("Spoke")

EnergyLink 200 0

of Can Have up to Seven Nodes on 1,000 ft. (304.8 m) (Eight including

EnergyLink 2000

the

3-12 Andover Controls Corporation

)

Cabling Configuration for ARCNET

Figure 3-12 shows a fiber optic cable distributed star topology.

Figure 3-12. Fiber Optic Distributed Star Topology Network

EnergyLink 2000

Fiber Optic Buses Cascading

EnergyLink 2000

Each Arm ("Spoke")

EnergyLink 200 0

of Is Like a Bus

Each Spoke Is Coaxial Cable and Can Have up to Seven Nodes on 1,000 ft. (304.8 m) of Cable (Eight Nodes including the EnergyLink 2000)

EnergyLink 2000

Distributed star topology is the most common configuration of ARCNETEnergyNet. You can form it with a variety of types of cabling, from coaxial cabling to fiber optic to twisted pair. Coaxial cabling is still the one that connects all nodes to the network, but you may switch to other types of cabling using EnergyLink 2000 or EnergyLink 2101 and following the criteria under the rules for each type of network given earlier in this chapter.

Infinity Network Configuration Guide 3-13

Cabling Configuration for ARCNET

Expanding the Network with EnergyLink 2000s

A single EnergyLink 2000 can have up to 16 ports. Either a single node or a bus of up to seven nodes (the EnergyLink 2000 becomes the eighth) can connect to a single port. The prepared coaxial cable male BNC connector attaches to a standard port without a T connector or terminator.

The other models of EnergyLink 2000 offer up to four ports. You can use them as hubs if you plan to form smaller stars.

The EnergyLink 2000s offers the following expansion options:

• You can have more than four nodes without losing reliability.

• You need not terminate unused ports.

• A fault on one cable or node does not affect other cables or nodes on the network.

• You can add or remove nodes without reconfiguring the network.

• You can use a cable length of up to 1,000 ft (304.8 m) between low impedance nodes.

• You can have a coaxial bus off each EnergyLink port with up to seven nodes on it. Since EnergyLink 2000 (or other models of EnergyLink 2000) is considered a node of each bus it connects to, you can have only seven more nodes on 1, 000 ft (304.8 m) of cable.

• The total cable cascading EnergyLink 2000s (or other models of EnergyLink

2000) can be up to 4 miles (6.4 km) long.

• You can cascade up to eight EnergyLink 2000s.

• You can easily switch cable types at any time by inserting a module with the number and type of ports you want into one of the connectors on the EnergyLink

2000. Or you can switch cable types with EnergyLink 2101.

• You can have multiple modules for various cable types, so you can have fiber optic cable on one module, coaxial cable on another, and so on—all connected at one EnergyLink 2000.

Each port on the EnergyLink 2000 has a transceiver that matches that of the controller or the network interface card of the workstation.

Rules When Using EnergyLink 2000s in a Distributed Star Topology

When using a distributed star topology, you must adhere to the following:

• For all types of cabling, you must terminate every controller or workstation at the end of a spoke on a hub—either by leaving the 93 Ω terminator in the controller in tact or by jumpering the card on the workstation.

3-14 Andover Controls Corporation

Cabling Configuration for ARCNET

• All of the restrictions given earlier for each type of cabling also apply in the distributed star configuration.

• Only one end of a bus may connect to an EnergyLink 2000.

• For every 1,000 ft (304.8 m) of cabling with seven nodes on the s ame bus, you must install one EnergyLink 2000 as a repeater.

Cascading EnergyLink 2000s

You can cascade EnergyLink 2000s by connecting a prepared coaxial cable to an open port on each one.

Figure 3-13 shows three cascaded EnergyLink 2000 hubs.

Figure 3-13. Stacked EnergyLink 2000 Hubs Cascaded with Coaxial Cable

Coaxial Cable

Stacking EnergyLink 2000s dramatically increases the number of nodes you can have connected in one area.

You can also cascade and stack other members of the EnergyLink 2000 family, but when you do, you reduce their already limited number of ports, so they are not as practical a choice for connecting multiple stars.

Refer to the EnergyLink 2000 manual for further information on stacking your EnergyLink 2000s.

Infinity Network Configuration Guide 3-15

Cabling Configuration for ARCNET

Extending a Bus with an EnergyLink 2000

To increase the number of feet of coaxial cable between two controllers, you use an EnergyLink 2000, as follows:

Caution

Remember that every EnergyLink 2000 series link counts as a node on the network. Each one reduces the total number of workstations and cont rollers you can have on the network.

1. Disconnect one male end of a connected coaxial cable from the last controller and connect it to the first open port of the EnergyLink.

2. Connect the end of a new prepared coaxial cable to a second open port of the EnergyLink.

Figure 3-14 shows how the EnergyLink 2000 connection looks.

Figure 3-14. Connecting an EnergyLink 2000 to Extend a Bus

T Connector for Workstation with PS/2 Card

EnergyLink 2000

First Coaxial Cable

Second Coaxial Cable

Connect to the Next Controller on the N etwork

3. Connect the new coaxial cable to the next controller or workstation on the network.

4. Be sure that the workstation is properly terminated if it is at the end of the bus.

3-16 Andover Controls Corporation

Cabling Configuration for ARCNET

Planning Your Cabling Configuration

When you plan your configuration, decide first how many controller s y ou want on the network. How are they situated? Would it be best to put them on hubs? If you have more than a few, for the best reliability and simplest troubleshooting, you should go with a star or distributed star topology.

Andover Controls strongly recommends that you draw a system map, showing all cables, controllers, workstations, hubs, and other elements of each ARCNET-

EnergyNet at your installation. You should draw a separate map of each ARCNET- EnergyNet. You should use the conventions described in Appendix D. When you

contact our Technical Services Department for assistance, you will be required to show us a map that uses these conventions.

Measuring Cable Lengths

Refer to your ARCNET-EnergyNet map. For each star on the distributed star network, measure the distance from the hub to

each controller, workstation, or other EnergyLink 2000, 2100, or 2101. Record the distance on the map.

For a bus network, measure the distances between nodes and record them. Now add up the total and refer to the table on cable lengths and information on ca-

bling requirements for coaxial or fiber optic cables earlier in this chapter.

Selecting a Cable Type

If you exceed the lengths acceptable for coaxial cable yo u may want to use f iber optic cable.

Be sure you meet the requirements of all local ordinances and of the National Electrical Code (NEC), article 725, where flame resistance and smoke emissions standards are stated. Plenum rated cable, although more costly, does meet these regulations.

Table 3-2 shows a selection of cable types and their order numbers. You can choose from two types of either coaxial or fiber optic cable for both plenum and nonplenum.

Infinity Network Configuration Guide 3-17

Cabling Configuration for ARCNET

Table 3-2. Coaxial and Fiber Optic Cables for ARCNET-EnergyNet

Cable Type NonPlenum Plenum

RG-62/u

Coaxial Brand-Rex

#RG 62

Brand-Rex #RG 62

Brand-Rex

62.5/125 Fiber Optic

Andover Controls recommends RG-62/u as the standard cable for ARCNET-

#HF062T2ZL Belden 225812

EnergyNet

Be sure you have a BNC T connector for every controller.

Calculating Total Delays on Long Networks

On long networks sometimes signal delay occur between nodes. The total delay cannot exceed 31 µs on ARCNET-EnergyNet.

Each node and cable on the network adds to the total delay of the network. Table 3-3 gives the amount of delays produced by cables and EnergyLink 2000s.

You can add up the amounts to predict the delay on your network.

Table 3-3. Network Delay Produced by Network Parts

Node or Cable Delay (µs)

EnergyLink 2000s

0.01/box

RG-62/u 0.12/100 ft

62.5/125 0.15/100 ft

3-18 Andover Controls Corporation

Cabling Configuration for ARCNET

Summary of Node Connection Rules for All ARCNET-EnergyNet Topologies

You can connect a terminated workstation or controller to one of the following:

• Another workstation or controller (point-to-point connection).

• Any of the EnergyLink 2000s.

• Either end of a bus.

You can connect a workstation or controller that is not terminated to one of the following:

• Anywhere on the bus except the ends.

• Any of the EnergyLink 2000 series links (if controller is first node on arm of star).

You can connect any of the EnergyLink 2000 series links to one of the following:

• A single terminated workstation or controller.

• Another link in the EnergyLink 2000 series.

• Only one end of a given bus with up to 1,000 ft (304.8 m) of cable, using seven nodes.

Table 3-4 shows the maximum length of cable between nodes you can use for the various cable types on particular topologies.

Table 3-4. Maximum Lengths of Cable Segments for Coaxial and Fiber Optic Cabling of ARCNET-EnergyNet

Cable and Topology Maximum Cable Length

Coaxial RG-62/u Star 1,428 ft (435.25 m) Coaxial RG-62/u Bus 1,428 ft (435.25 m) for 2 nodes

(minus 72 ft (21.94 m) for each extra node)

Glass Fiber Optic 62.5/125 Bus 6,000 ft (1,824.8 m)

Infinity Network Configuration Guide 3-19

Cabling Configuration for ARCNET

3-20 Andover Controls Corporation

Chapter 4 Understanding Ethernet-EnergyNet

Ethernet-EnergyNet

This chapter covers the following:

• What Is Ethernet-EnergyNet?

• What Is the Hub of Ethernet-EnergyNet?

• What Is the Ethernet-EnergyNet Networ k Interfac e Card?

Infinity Network Configuration Guide 4-1

Ethernet-EnergyNet

What Is Ethernet-EnergyNet?

The Ethernet-EnergyNet

is a high-speed CSMA/CD local area network (LAN) of

Andover Controls controlle rs and wor ks tations and the network software that makes them communicate.

The Ethernet-EnergyNet network drivers are NETBEUI-compatible. The workstations on the network communicate through the operating system, the Microsoft-OS/ 2 LAN Manager software. The LAN Manager uses a shared resource environment, with a file server serving all other workstations on the network.

Ethernet-EnergyNet has a minimum of two controllers or a controller and a workstation, usually connected with RG-58 a/u coaxial cable. It can connect up to 254 nodes. Data transmits over the Ethernet-EnergyNet at a rate of 10 Mb/sec. Depending on your particular installation, you may want to use unshielded twisted-pair, fiber optic, or coaxial cabling in a variety of combinations. You can use all three types in combination to construct a single Ethernet-EnergyNet.

Ethernet-EnergyNet can be constructed as a bus or daisy chain or in a combination bus/daisy chain and star topology called “distributed star” topology.

Andover’s Ethernet-EnergyNet is a baseband network, connected by up to 1,635 f t (500 m) of twisted pair cabling, 3,033 ft (925 m) of thin coaxial cable, and/or up to 19,683 ft (6,000 m) of fiber optic cable. You can have an entire network length of up 10,229 ft if you use all three types of cable (see the next chapter for more details on cabling arrangements). The number of nodes on the network depends on the type

of cable you use. For each applicable segment2 of coaxial cable, you can have 30 nodes. Each segment of twisted pair or fiber optic cable connects two nodes in an arrangement called a “point-to-point” configuration.

As with an y baseband networ k, E thernet- En ergyNet is e a s y to install. I t requires only ca bling and interface modules . Y ou may also use EnergyLink 2500, an el ectroni c repea ter and /or cabl e switc hing b ox, to e xtend t he amount of cabling to its maximum, to form a distributed star topology, and to utilize eve ry type of cable available. The Energy Link 2500 am plifies and retran smits signals so that they can travel further on the network. I t also has mo dules that allow you to change the type of cable. You lear n mo r e about the EnergyLink 2500 later in th is c ha pter.

What Are the Nodes on Ethernet-EnergyNet?

The two types of nodes on Ethernet-EnergyNet are controllers and workstations.

1. Ethernettrols software.

2. Note that you cannot have 30 nodes on every segment, because of Internetwork Repeaters, discussed in the next chapter.

EnergyNet

is Ethernet, developed by Xerox Corporation, combi ned with Andover Con-

4-2 Andover Controls Corporation

Ethernet-EnergyNet

The 9200 controllers a re Eth ern et-EnergyNet controllers . (O th e r controllers, called Infinet controllers, are not directly connected to the EthernetEnergyNet. See Chapter 6 for more on the Infinet controller network.) Each 9200 controller counts as a single node on Ethernet-EnergyNet. Each co n tro lle r requires two types of IDs:

• EnergyNet ID—The ID you assign strictly for use by EnergyNet. You set this ID by setting a DIP switch inside the controller.

• Ethernet ID—The ID assigned by Andover Controls that allows the unit to be used on not only your Ethernet, but on a world-wide Internet. The Ethernet ID is a number that is unique for every node in the entire world.

How to set the EnergyNet ID is in the installation guide for the 9200 controller. How to set the Ethernet ID is in the programmer’s guide for the Infinity or ICS controllers or in the programmer’s guide for the workstation.

The 8000 workstation is a user-friendly IBM PC workstation with detailed color graphics that connects to the network. The 8000 workstation can also be a file server, storing files for other workstations on the Ethernet-EnergyNet. You can program all your controllers from a single workstation that operates as a file server, if you choose. Each workstation or server counts as a single node on EthernetEnergyNet. You give each workstation an ID by setting a switch on its network interface card. How to set the switch is detailed in the inst ructions you received with the card.

Each active hub is also considered a node on the network. You set the ID of the hub as described in the EnergyLink 2500 Installation Guide.

Why Is the CSMA/CD Access Method Effective?

A CSMA/CD network, as discussed in Chapter 1, is one of the best methods for real-time building control s ystems. Ethernet -EnergyNet uses this data transmission system to transmit data rapidly, producing a highly responsive control system network.

Ethernet-EnergyNet handles all network control so that 9200 and 8000 software can ignore network control and operate more efficiently.

If you remove a controller or workstation from the network, the Ethernet-EnergyNet automatically reconfigures itself and continues operating without interruption.

Infinity Network Configuration Guide 4-3

Ethernet-EnergyNet

What Is the Hub of Ethernet-EnergyNet?

The hub of Ethernet-EnergyNet is EnergyLink 2500. EnergyLink 2500 is a seven-port modular active hub and cable-switching box that

retransmits messages to the spokes (arms) of the hub just the way an electronic network repeater would.

The hub can have up to seven modules, each with a single port. Each module can be for either coaxial, twisted pair, or fiber optic cable. Because you can interchange modules, you can have EnergyLink 2500 function as a cable switching center, if you connect the appropriate modules to it.

When EnergyLink 2500 connects several nodes, it controls communication on two fronts:

• Between the nodes in the star.

• Between the nodes in the star and the other hubs on the network.

Since fiber optic cable does not conduct electricity, when fiber optic cable connects two arms of the network, it isolates them electrically, which protects each arm from any electrical problems on another arm.

Because each node has a separate transceiver, you do not encounter problems with cable loading.

The EnergyLink 2500 has some other special ch aracteristics. It detects collisions on any bus connected to it. When it detects more than 31 consecutive collisions on a single arm of a star, it automatically partitions the network at the port to that bus or star.

When it partitions the network at that port, that one bus or arm is temporarily unable to communicate with the others. This partitioning protects the rest of the network from those collisions until the situation is resolved.

Once the situation is resolved, the port to the bus or star begins functioning normally again.

If a bus or arm has been partitioned from the network, LEDs on the EnergyLink 2500 indicate that situation.

In the next few sections, you find out some basic information about the EnergyLink

2500. For more information, you can refer to the EnergyLink 2500 Installation

Guide supplied with the unit.

4-4 Andover Controls Corporation

Ethernet-EnergyNet

What Are Components of EnergyLink 2500?

Figure 4-1 shows what the EnergyLink 2500 looks like before you connect the modules. (You always mount the EnergyLink 2500 inside a 9200 controller.)

Figure 4-1. EnergyLink 2500

Cutouts in Front of Enclosure for Modules

When you first see EnergyLink 2500, you see seven long narrow oval cutouts. You insert a module with a single port into the unit so that its LEDs display through the cutouts. You do not have to use all ports, only those that you need.

When you order EnergyLink 2500, you order at least one module. You can use various combinations of coaxial, twisted pair, or fiber optic modules in the ports. To order EnergyLink 2500 and the modules, use the following Andover Controls mod- el numbers:

• Andover Controls Model # 2500—Seven-port Ethernet Hub (+ 5 V, powered by the 9200 controller)

• Andover Controls Model # 2501—Twisted Pair Module (10BASE-T)

• Andov er C ontrol s M odel # 2502—Thi n Coaxial Module ( 10BASE-2)

• Andov er C ontrol s M odel # 2503—Fib er Optic Module ( 10BASE- F L )

Infinity Network Configuration Guide 4-5

Ethernet-EnergyNet

Figure 4-2 shows a port on a fiber optic module. Each fiber optic port connects to the end of a fiber optic cable. Each coaxial port connects to the male end of a BNC connector. Each twisted pair port connects to an RJ 11 connector.

Groove

Figure 4-2. Po rt for Fi ber Opt i c Cable

LEDs That Display

EnergyLink 2500

Receive

Fiber Optic Cable Port s

Transmi t

20-pin Female Connector

Although the hub behaves the way a repeater would, you might not want to use it as a repeater, because you would not take advantage of the seven ports. By using various cable types in the seven ports, you can form multiple-cable-type networks.

How Do You Set the Repeater Interface Controller (RIC) DIP Switch?

You set the Repeater Interface Controller DIP switch on the EnergyLink 2500 to indicate whether the hub is using a twisted pair interface controller (for twisted pair cable), an AUI interface controller (for c oaxial or fiber optic cable), or some combination of both.

For exact settings of the RIC DIP switch, refer to the EnergyLink 2500 Installation Guide.

How Do You Read EnergyLink 2500’s LEDs?

EnergyLink 2500 also has LED lights that correspond to each module. One of the LEDs on the twisted pair modules indicates polarity reversal, a potential

problem on twisted pair networks. Both twisted pair and fiber optic cable modules have an LED for detecting a broken

wire on the cable segment.

4-6 Andover Controls Corporation

Ethernet-EnergyNet

All types of cable have LEDs that indicate receiving data, collisi ons, and part itioning of the network at a particular arm of the hub.

See Chapter 7 or the EnergyLink 2500 Installation Guide for more details on how to interpret the LEDs.

Figure 4-3. EnergyLink 2500 with Seven Modules

Modules with LEDs Displaying through Cutouts in Front of Enclosure

Infinity Network Configuration Guide 4-7

Ethernet-EnergyNet

What Is the Ethernet-EnergyNet Network Interface Card?

If you can set the EnergyNet ID of a 9200 controller by setting a DIP switch inside the controller cabinet, how do you set it on a workstation? You set it on the network interface card for the workstation.

Ethernet-EnergyNet supports two types of network interface cards that let you connect workstations to the network:

• Cards for IBM PC/AT and Compaq computers on an AT bus Purchase with any of the following connector types: RJ 45, AUI, BNC, or ST.

• Cards for IBM PS/2 computers on a PS/2 bus Purchase with any of the following connector types: RJ 45, AUI, BNC, or ST.

See your Andover Controls Representative for specific cards available. Since the workstation with a network interface card is considered a node on the

Ethernet-EnergyNet, it must have not only an EnergyNet ID, but an Ethernet ID, just as all other nodes on the network have.

While EnergyNet IDs for 9200 controllers range from 1 to 223, for 8000 worksta- tions they range from 224 to 254. (EnergyNet ID number 0 is reserved by EthernetEnergyNet.) You set the EnergyN et ID on the card, according to the card manufac- turer’s instructions. Ethernet IDs are usually preassigned when you purchase the equipment.

To find the workstation’s Ethernet ID and then set it up in the SX 8000 software, refer to the SX 8000 Programmer’s Guide for instructions .

4-8 Andover Controls Corporation

Cabling Configuration for Ethernet

Chapter 5

Selecting a Cabling Arrangement for EthernetEnergyNet

We recommend you read all of the information in this chapter before designing your own configuration. This chapter covers the following:

• Understanding Cable Types

• Forming a Simple Point-to-Point Configurat ion with Twisted Pair Cable

• Forming a Star Configuration with Twisted Pair Cable

• Forming a Distributed Star Configuration with Twisted Pair Cable

• Understanding Thin Coaxial Cable

• Forming a Simple Two-Node Bus with Thin Coaxial Cable Using T Connectors

• Expanding the Simple Bus with Thin Coaxial Cable Using T Connectors

• Lengthening the Thin Coaxial Cable Bus

• Forming a Simple Bus with Thin Coaxial Cable Using Cable Taps

• Forming a Star or Distributed Star Configuration wit h T hin Coa xia l C a ble Using EnergyLink 2500

• Forming a Two-Node Bus Configuration with Fiber Optic Cable

• Lengthening the Fiber Optic Bus

• Forming a Star Configuration with Fiber Optic Cable

• Employing Multiple Cable Types in Long/Complex Networks

• Employing Bridges in Long Networks

• Planning and Setting Up a Long Network

Infinity Network Configuration Guide 5-1

Cabling Co nf ig uration for Ethern e t

Understanding Cable Type s

When creating an Ethernet-EnergyNet, you can use any or all of the fol lowing cable types:

• Unshielded Twisted Pair Cable

• Thick Coaxial Cable

• Thin Coaxial Cable (Thinnet or Cheapernet)

• Fiber Optic Cable

Before you find out how to design your network, let’s take a look at the characteristics of each type of cable.

Characteristics of Unshielded Twisted Pair Cable

Unshielded twisted pair cable is telephone cable. Twisted pair cable is very inexpensive and easy to install and maintain. In fact, you can sometimes put an Ethernet on spare twisted pairs available on an existing telephone system.

Caution

You should always have an existing telephone system checked to be sure it is made up of twisted pair cabling before using it for Ethernet-EnergyNet. You can have the cable tested by a qualified cable installer or consultant. 10Base-T equipment manufacturers often provide twisted pair cable certification testing services.

For an Ethernet-EnergyNet you require two twisted pair cables, one for the transmit signal, the other for the receive signal. The two pairs are wrapped together in a single coating. Despi te its low cost, twisted pair cable transmits data a t a rapid rate

with less than one error in 100 million (108) bits. A twisted pair network can have an entire network length of 1,635 ft (500 m) with segments (lengths of cable without repeaters or between two repeaters) of up to 327 f t ( 100 m). The cable should have

a twist rate of 2 to 10 twists per foot and has a impedance of 85 to 111 Ω. You use twisted pair cable to form an Ethernet that meets the IEEE 10Base-T

specifications.

Twisted Pair Network Topologies

You usually run twisted pair from a central location, such as a hub inside a 9200 controller, forming a star topology LAN. Or, you can run twisted pair between two controllers, in a point-to-point topology.

Figure 5-1 shows a twisted pair star topology network.

5-2 Andover Controls Corporation

Figure 5-1. Twisted Pair Star Topology Network

Twisted Pair Cabling Is Always Connected Point-to-Point

Cabling Configuration for Ethernet

Each node on the twisted pair network is connected in a point-to-point arrangement, so that each segment of cable connects only two nodes ( the hub is also a node). Two is the maximum number of nodes you can have on any segment of twisted pair cable.

The connectors for twisted pair cable are like the twisted pair connector found on the 9200 controller, an RJ 45 connector.

You cannot have bridges, taps, or T connectors on a twisted pair network; however, you can have an EnergyLink 2500 hub mounted inside a 9200 controller.

Characteristics of Thick Coaxial Cable

You can form a coaxial Ethernet with RG 11 coaxial cable. Because of its high cost, thick coaxial cable is rarely used for Ethernet-Ener gyNet.

This coaxial cable forms a network that meets the IEEE 10Base-5 specifications. A network made with this “thick” coaxial cable is expensive, but has a high tolerance for noise. You can form a thick coaxial Ethernet-EnergyNet with an entire network length of up to 11,808 ft (3,600 m) with segments (lengths of cable without repeaters or between two repeaters) of up to 1,640 ft (500 m).

Thick Coaxial Cable Network Topologies

You set up thick coaxial cable in a bus topology by running special transceiver cable called “AUI cable” from each node to the coaxial cable. The thick coaxial bus is called the “backbone.”

Infinity Network Configuration Guide 5-3

Cabling Co nf ig uration for Ethern e t

You connect the AUI cable to the coaxial cable backbone using a special transceiver (called a “tap”), that taps into the cable.

Figure 5-2.shows a thick coaxial bus topology network.

Figure 5-2. Thick Coaxial Bus Topology Network

Thick Coaxial Bus, Called the “Backbone”

For information on setting up a cabling configuration with thick coaxial cable, refer to Appendix B.

Characteristics of Thinnet Coaxial Cable

You can form another type of coaxial Ethernet with RG 58 a/u or RG 58 c/u coaxial cable. Since this cable is thinner than that used for thick coaxial networks, such a network is called Thinnet. Since Thinnet coaxial cable is less expensive that other types of coaxial cable, Ethernets formed with it are sometimes called “Cheapernet.” This coaxial cable forms a network that meets the IEEE 10Base-2 specifications.

Thinnet coaxial cable, unlike twisted pair cable, is a shielded cable. The shielding protects the cable from noise in the environment. A Thinnet can have an entire network length of 3,033 ft (925 m) with segments (lengths of cable without repeaters or between two repeaters) of up to 606 ft (185 m).

Thin Coaxial Cable Network Topologies Using T Connectors

You can set up thin coaxial cable in bus topology by connecting the cable to a T connector that you screw onto each node.

Figure 5-3 shows a thin coaxial bus topology network. This one employs T connectors.

5-4 Andover Controls Corporation

Cabling Configuration for Ethernet

Figure 5-3 . Thin C oaxial Bus To pol o gy Ne tw o rk

Terminat ed N od es

Connectors and Terminators on Thin Coaxial Cable Networks

The connectors for the RG-58 a/u or RG-58 c/u cable are T connectors. You can buy pieces of cable with preattached T connectors to put together 10Base-2 Ethernets.

Screw-on 50 Ω terminators are required on end units of the network.

Caution

Always use premade coaxial cables, rather than trying to screw BNC connectors onto the ends of cable pieces. Premade cables form the most reliable thin coaxial Ethernets.

Thin Coaxial Cable Network T opologies Using Cable Taps

Instead of using T connectors, you can set up Thinnet in a bus topology by connecting each node to a transceiver (also called a “tap”).

AUI cable “drops” from the bus and connects the transceiver to the controller or workstation. This cable can be up to 164 ft (50 m) long. You can purchase AUI transceivers specifically designed to attached to thin coaxial cable.

Characteristics of Fiber Op tic Cable

Fiber optic cable is the highest performance cable you can use to form EthernetEnergyNet. Fiber optic cable is made of glass or plastic and tran smits signals made of high intensity light. B ecause of its unique nature, fi ber optic cable can t ransmit a signal for longer distances than any other type of cable available for EthernetEnergyNet.

Fiber optic cable is also the most relia ble cable; howe ver, it is more expensive than coaxial or twisted pair. Because it is resistant to noise, fiber optic cable is the best cable for outdoor cable runs.

The type of fiber optic cable you can use to form Ethernet-EnergyNet is called graded index, multimode fiber optic cable, usually 62.5/125 µm size. Throughout

Infinity Network Configuration Guide 5-5

Cabling Co nf ig uration for Ethern e t

this manual, any information you see about fiber optic cable is about this 62.5/125 cable. For information on other types, refer to the manufacturer’s specifications.

The 62.5/125 fiber optic cable is ideal for the wavelength of 850 nm produced by Ethernet transmitters . T his wavele ngth, requi re d for E therne t-EnergyNet, operates using light emitting diodes (LEDs) to send a “signal” down the cable. Andover recommends this cable because it meets the IEEE specificat ions f or a 10Base-F L Ethernet and it is the most economical form of fiber optic cable—ideal f or building automation and process control systems.

Fiber Optic Cable Topologies

You must connect fiber optic cable to the Ethernet-EnergyNet by running twisted pair, thin coaxial, or transceiver (AUI) cable from the 9200 controller to the EnergyLink 2500. The 2500 becomes a media changing device, where you then connect the fiber optic cable to a fiber optic port.

The network you form this way can be a bus or a star topology. Figure 5-4 shows a fiber optic bus topology network.

Figure 5-4. Fiber Optic Bus Topology Network

Fiber Optic Cable

5-6 Andover Controls Corporation

Figure 5-5 shows a star topology network.

Figure 5-5. Fiber Optic Star Topology Network

9200

Controller

Twisted

EnergyLink

2500

Hub

Cabling Configuration for Ethernet

Pair

Cable

You can also combine these two topologies to form a distributed star topology. Regardless of the topology, each node (yes, EnergyLink 2500 is a node) on the fiber optic network is connected in a point-to-point arrangement, so that each segment (length of cable without repeaters or between two repeaters) connects only two nodes. In the case of a bus, two nodes are an EnergyLink 2500 and a 9200 controller, or an EnergyLink 2500 and a workstation. Two is the maximum number of nodes you can have on any segment of fiber optic cable.

Connectors on Fiber Optic Cable Networks

To connect to the fiber optic port on the EnergyLink 2500, you use ST style fiber optic connectors. Because these connectors seal the connection tightly, they retransmit the signal from the hub with a minimal loss of light intensity.

Summary of Characteristics of Cable Types

Table 5-1 summarizes the types of cable, the minimum and maximum cable length, the maximum network length, and number of nodes per segment for each type.

Infinity Network Configuration Guide 5-7

Cabling Co nf ig uration for Ethern e t

Table 5-1. Types and Characteristics of Cable for Ethernet-EnergyNet

IEEE Cable Type

Twisted Pai r 10BASE-T None

Thick Coaxial 10BASE-5

Thin Coaxial

Fiber Optic 10BASE-FL None

Cable Type Impedance

Network

Designation

10BASE-2

(Thinnet)

Table 5-2 lists the impedance and Belden equivalents for each cable type.

Table 5-2. Ordering Information for Ethernet-EnergyNet Cable Types

Minimum Segment Length

8.2 ft (2.5 m)

20 in (0.5 m)

Maximum Segme n t Length

327 ft (100 m)

1,640 ft (500 m)

606 ft (185 m)

6,561 ft (2000 m)

Maximum Networ k Length

1,635 ft (500 m) 2

11,808 ft (3,600 m) 100

3,033 ft (925 m) 30

19,683 ft (6000 m) 2

Brand-Rex * Part Numbers

Maximum Nodes per Segment

Twisted Pair 100 Ω (85 -111 Ω) BE 57562 Twisted Pair Plenum 100 Ω (85 -111 Ω) Belden #88102 Thick Coaxial RG-11 50 Thick Coaxial RG-11 Plenum 50 Thin Coaxial RG-58 a/u or c/u 50 Thin Coaxial RG-58 a/u or c/u

Plenum 50 Fiber Optic 62.5/125

PVC Jacket Fiber Optic 62.5/125

Plenum-Rated Fiber Optic 62.5/125

Outdoor

Ω Ω Ω

Ω

Not Applicable HF062T2ZL (1 pr.)

Not Applicable HF062S2GNM (1 pr.)

RG 11 RG 11 RG 58

RG 58

HF062T4L (2 pr.)

HF062S4GNM (2 pr.)

5-8 Andover Controls Corporation

Cabling Configuration for Ethernet

Forming a Simple Point-to-Point Configuration with Twisted Pair Cable

Twisted Pair (10Base-T) Ethernet-EnergyN et

Suppose you want to connect two 8000 workstations, two 9200 controllers, or one of each. You can connect them directly from the 10Base-T connector on one 9200 controller (or the workstation interface card) to the 10Base-T connector on the other.

Figure 5-6.shows the location of the 10Base-T RJ 45 connector in the upper left corner of the printed circuit board on the 9200 controller.

Figure 5-6. Location on 9200 Controller of 10Base-T RJ 45 Connector Used in

Twisted Pair Configurations

10BASE-2

Coaxial

10BASE-2

10BASE-5

10BASE-T

RJ 45

for

Twisted Pair

AUI

10BASE-5

(AUI)

10BASE

2 5T

ENL PWR

10BASE- T

Ethernet

Switch

10BASE-2 10BASE-5 10BASE-T

Ethernet

Switch

Above the RJ 45 twisted pair connector and to the right you see two Ethernet switches. Be sure to set each of these Ethernet switches to 10Base-T for twisted pair.

Infinity Network Configuration Guide 5-9

Cabling Co nf ig uration for Ethern e t

Figure 5-7.shows a two-node twisted pair point-to-point configuration.

Figure 5-7. Twisted Pair Point-to-Point Configuration

Twisted Pair Cable

9200 Controller

Each Controller Has Built-in

9200 Controller

Twisted Pair Port Labeled 10Base-T

You connect the twisted pair cable to the 10Base-T RJ 45 connector inside the 9200 controller, on the upper left corner of the printed circuit board. The cable you use in this situation must be cross-over cable, rather than straight-through cable. (You find out the difference later.)

To connect a workstation, you connect the twisted pair cable to the 10Base-T RJ 45 connector on the workstation network interface card (01-4004-014 on an AT computer or 01-4004-018 on a PS/2 computer).

Two is the maximum number of nodes you can have on any segment of twisted pair cable. Each node is automatically terminated at an RJ 45 connection. It is terminated to show the node is at the end of a network—at the end of a cable or the end of an arm of a star.

Since each controller or workstation has only one twisted pair port, you have now used all of the twisted pair ports available on these two controllers. So, how do you connect a third controller or workstation to this network?

You form a star configuration.

5-10 Andover Controls Corporation

Forming a Star Configuration with Twisted Pair Cable

You can connect three to six controllers with twisted pair cable by connecting them all to an EnergyLink 2500 hub.

Figure 5-8.shows such a star topology network with a single star. This star has the maximum number of twisted pair cable segments allowed on an EnergyLink 2500 hub—six. Each cable connects from the hub to one other node in a point-to-point configuration. When you connect each node to the hub, you use straight-through cable, rather than cross-over cable.

Figure 5-8. Twis te d Pa ir S tar Topology Netw ork wi t h Maxi m um N umber of Twisted

Pair Segments Allowed on EnergyLi nk 2500

Twisted Pair Cable (Can Be Coaxial)

9200 Controller

Cabling Configuration for Ethernet

Max 327 ft. (100 m)

Twisted

Pair

Cable

EnergyLink

2500

You can also choose to use coaxial cable to connect to Port 1 of the hub (only ports 2 through 7 can have twisted pair cables) and still have six ports left for twisted pair cable.

This configuration is ideal for a small network. B ut what if you want to develop this network further?

Hub

Twisted Pair

Cable

8000 Workstation

Infinity Network Configuration Guide 5-11

Cabling Co nf ig uration for Ethern e t

Forming a Distributed Star Configuration with Twisted Pair Cable

To have more than six controllers/workstations, you can connect a segment of twisted pair cable from the EnergyLink 2500 to another EnergyLink 2500. This connection is referred to as “cascading” repeaters.

Figure 5-9.shows a network with two cascaded repeaters. Each hub then allows up to four twisted pair arms—in addition to the connections

to each other and to the controller at the center of the star.

Figure 5-9. Twisted Pair Distributed Star Topology Network wi th Two EnergyL ink 2500s

Cascaded Together

9200

Controllers

Max 327 ft.

(100 m)

Cascaded

EnergyLink 2500

Note

Remember that you can never connect twisted pair cable to Port 1 on the hub.

You can continue to cascade hubs until you have the maximum of four EnergyLink 2500s.

Figure 5-10.shows an twisted pair distributed star topology with four cascaded hubs. Note that each hub has the maximum number of twisted pair cables connected to it—six. One cable always connects the 9200 at the center of the star. However, if you use coaxial cable to connect to the 9200, you can have one extra arm of twisted pair cable in each star.

5-12 Andover Controls Corporation

Cabling Configuration for Ethernet

Figure 5-10. Twisted Pair Distributed Star Topology Network with Four EnergyLink 2500s

Cascaded Together

Total Network Length Cannot Exceed 1,635 ft. (500 m)

Twisted Pair Cable Th at Connects to

9200

Controller Housing the Link

EnergyLink 2500

Max 327 ft. (100 m)

Twisted Pair Cascading

EnergyLink 2500

With twisted pair cables, be sure the cable from either a 9200 or a workstation to the EnergyLink 2500 is a straight-through cable. Cable between cascaded EnergyLink 2500s should be cross-over cable.

Figure 5-11.shows when you should use each type of cable, cross-over or straightthrough. Notice which wires cross to form the correct cross-over cable.

Infinity Network Configuration Guide 5-13

Cabling Co nf ig uration for Ethern e t

Figure 5-11. Wh en t o Emp lo y Twi ste d Pai r Straight-Through

or Cross-Over Cable

Straight

-Through Cable

9200

Controller

1 2 3 6

RJ 45 Connectors

1 2 3 6

EnergyLink

2500

1 2 3 6

EnergyLink 2500

inside

5-14 Andover Controls Corporation

9200

Crossed

Pairs

inside

Cross-Over

Cable

EnergyLink 250 0

inside

9200

Cabling Configuration for Ethernet

Rules for Twisted Pair Networks

If you choose to employ twisted pair cable, be sure your network meets the following criteria:

• Follow National Electrical Code (NEC) restrictions if running cable through HVAC plenums or ducts. You can use Teflon-coated cable in this situation if the code requires it.

• Be sure the amount of cable between nodes (a single segment of cable) does not exceed 327 ft (100 m).

• Be sure you never have more than two nodes on a single segment of cable.

•Each E n ergyLink 2500 is a node on the network.

• To form a star topology, use EnergyLink 2500 as a hub.

• Be sure the overall network is does not exceed 1,635 ft (500 m).

Infinity Network Configuration Guide 5-15

Cabling Co nf ig uration for Ethern e t

Understanding Thin Coaxial Cable

Using Coaxial Cables

No matter which type of network topology you use, if you are using coaxial cable, each piece of thin coaxial cable connecting to a controller, workstation, or EnergyLink 2500 must have a BNC male connector at both ends. You should use premade cables, because premade cables provide the most trouble-free networks.

Figure 5-12.shows a single piece of premade coaxial EnergyNet cable. Each piece of coaxial cable from male connector to male connector must be at least 20 in. (0.5 m) long for Ethernet.

Figure 5-12. Premade Ethernet-EnergyNet Thinnet Coaxial Cable with Connectors

20 in. (0.5 m)

minimum

Male Connectors on either end of Coaxial Cable

Note

Remember that a piece of cable differs from a segment. A segment of thin coaxial cable is between two repeaters or hubs. A piece of thin coaxial cable is between two controllers.

5-16 Andover Controls Corporation

Cabling Configuration for Ethernet

Forming a Simple Two-Node Bus with Thin Coaxial Cable Using T Connectors

Suppose you want to connect two 8000 workstations, two 9200 controllers, or one of each. To connect two nodes, you first connect a T connector to each node and terminate the nodes.

Figure 5-13.shows the EnergyNet coaxial T connector (Andover Controls Model #

2070). Every T connector on the network has three ends. The bottom of the T al-

ways connects to the coaxial connector on a controller, workstation, or EnergyLink 2500 on the network.

Figure 5-13. Ethernet-EnergyNet Coaxial T Connector

Coaxial Cable

Screws onto Controller, Workstation, or

The two sides of the T connector usually connect to a coaxial cable, but if you are terminating the network at the controller or workstation, you connect cable to one

side of the T and attach a 50 Ω terminator to the other side of the T. Where does the T connector attach to a 9200 controller? Figure 5-14.shows where you connect the coaxial connector in the upper left corner

of the printed circuit board inside the 9200 controller. After you screw on the T connector, if the node should be terminated, screw a 50 Ω terminator onto the open side of the T connector, as shown in the figure.

Next, look to the right of the coaxial connector and down. You see two Ethernet switches. Be sure you set both of them to 10Base-2.

EnergyLink 2500

Infinity Network Configuration Guide 5-17

Cabling Co nf ig uration for Ethern e t

Figure 5-14. Location on 9200 Controller of Coaxial Connector Used in Thin Coaxial Bus

Configuration with Built-in Transceivers

10BASE-2

Coaxial

50 Ω Terminator

Coaxial T

Connector

10BASE-5

AUI

10BASE

2 5T

ENL PWR

10BASE-2 10BASE-5 10BASE-T

Ethernet

Switches

10BASE-5

(AUI)

10BASE-T

RJ 45

On a workstation, the T connector screws onto the network interface card (01-4004016 for AT computers and 01-4004-020 for PS/2 computers). And on an EnergyLink 2500, the T connector screws onto a coaxial port.

Now, connect the premade thin coaxial cables to open sides of the T connector on each node.

Figure 5-15.shows how the thin coaxial Ethernet-EnergyNet cable connects to the T connector.

5-18 Andover Controls Corporation

10BASE-T

Cabling Configuration for Ethernet

Figure 5-15. Ethernet-EnergyNet Thin Coaxial Cable Connecting to T Connector

Male BNC Connector

BNC T Connector

Male BNC Connector

Connects to Controller or Workstation

Premade Cable

Connect to Another Node’s T Connector

Figure 5-16.shows the resulting simple point-to-point connection in a bus t opology with no hub. In this situation, since each node is at an end of the network, each node must be terminated.

Figure 5-16 . Two-No de Point-to- Point B us Topol ogy

Thin Coaxial Ethernet-EnergyNet with T Connectors

Controller T Connector

Is on Printed Circuit Board

Terminator Screws on Here

9200 Controller

Controller and Workstation

Works tation T Connector

Is on Network Interface

Card

Min 8.2 ft. (2.5 m) Max 606 ft. (185 m)

Terminator Screws on Here

8000 Workstation

Are Both Terminated

Infinity Network Configuration Guide 5-19

Cabling Co nf ig uration for Ethern e t

Expanding the Simple Bus w ith Thin Coaxial Cable Using T Connectors

To add more controllers/workstations to the two-node bus formed with T connectors, you first screw a T connector to each new node.

Then return to the two-node bus you developed earlier and remove the terminator from the end you want to extend. Connect a piece of premade cable to the open side of the T connector. Then connect the other end of the premade cable to the T connector on another node.

Repeat this process until you reach the last node. Then be sure to screw the 50 Ω terminator onto the last node. You can connect 30 nodes like this on up to 606 ft (185 m) of thin coaxial cable.

Figure 5-17.shows an expanded bus topology formed with thin coaxial cable and T connectors.

Figure 5-17. Expanded Bus Topology Thin Coaxial Ethernet-EnergyNet with T Connectors

Max Segment without Repeater 3,033 ft. (925 m) w/ Up to 30 Controllers

Min 8.2 ft. (2.5 m) Max 606 ft. (185 m)

The Two End Nodes

Are Terminated

5-20 Andover Controls Corporation

Cabling Configuration for Ethernet

Lengthening the Thin Coaxial Cable Bus

Now that you have extended the thin coaxial Ethernet-EnergyNet as far as possible, how do you have more than 606 ft (185 m) of cable on the network and make a network the total network length of 3,033 ft

(925 m)? How do you add more than 30 nodes? The answer to both of these questions is that you use the EnergyLink 2500 as a

repeater to build a longer network and the longer network then allows you to add more nodes, since every other 606 ft (185 m) segment allows up to 30 nodes.

Why every other segment? Because once you have at least three EnergyLink 2500s, you must have inter-repeater links (IRLs). An inter-repeater link is cable that connects two repeaters, but has no controllers or workstations on it.

Figure 5-18.shows where the inter-repeater links would be if you used the maximum of four EnergyLink 2500s with five segments of cable. Notice that the EnergyLink 2500s are connected to each other. This arrangement is called “cascading” hubs.

You can also form inter-repeater links on a 10Base-2 Ethernet-EnergyNet using twisted pair or fiber optic cable. Be sure, however, that the segment length is not longer than allowed for that cable type.

1. Remember, how ever, that s in ce stations on th e segme nt of cabl e may be onl y 29, since the

EnergyLink 2500

is also a node, the number of controllers/work-

Infinity Network Configuration Guide 5-21

EnergyLink 2500

becomes the 30th node .

Max 606 ft. (185 m) & 29 Controllers or Workstations

Max 606 ft. (185 m) & No

Controllers

Workstations

(each housed in a 9200 controller)

Inter-Repeater Links

Max 606 ft. (185 m) & 29 Controllers or Workstations

Max 606 ft. (185 m)

& No Controllers

Workstations

(each housed in a 9200 controller)

nk 250

Max 606 ft. (185 m) & 29 Controllers or Workstations

Total Network Length Cannot Exceed 3,033 ft. (925 m)

Cabling Co nf ig uration for Ethern e t

Figure 5-18. Inter-Repeater Links on Thin Coaxial Ethernet-EnergyNet Bus

5-22 Andover Controls Corporation

Cabling Configuration for Ethernet

Forming a Simple Bus with Thin Coaxial Cable Using Cable Taps

Another way of forming a bus with thin coaxial cable is to attach up to 164 ft (50 m) of a special cable called AUI cable to the Attachment Unit Interface (AUI) port on each 9200 controller or workstation network interface card.

Figure 5-19.shows the location of the AUI port in the upper left corner of the printed circuit board on the 9200 controller.

After you connect the AUI cable to the AUI port, look to the right and up. You see two Ethernet switches. Be sure you set both of them to 10Base-5. Why 10Base-5 for a 10Base-2 network? Because whenever you use the AUI port, you must always set the Ethernet switch to 10Base-5.

Figure 5-19. Location of AUI Port on 9200 Controller and Settings of Ethernet Switches

When Using AUI Cable to Connect to a Thin Coaxial Cable Network

10BASE-2

Coaxial

Set This Ethernet Switch to 1 0Base-5

10Base-5

AUI Port

to Connect

AUI Cable

10BASE-5

(AUI)

10BASE

2 5T

10BASE-2 10BASE-5 10BASE-T

Set This Ethernet Switch to 10Base-5

10BASE-T

RJ 45

10BASE-T

Infinity Network Configuration Guide 5-23

Cabling Co nf ig uration for Ethern e t

You then connect the pieces of thin coaxial cable to special transceivers (also called “taps”), so that a series of taps are lined up on the bus. The taps you can purchase to use with thin coaxial cable each have a built-in T connector (01-4006-002) so the male BNC connectors on the ends of the coaxial cable screw directly onto the taps.

Figure 5-20.shows the taps along a thin coaxial bus.

Figure 5-20. Transceivers (Taps) on a Thin Coaxial Bus

T Connec tor s

Transceiver

{

MAU Ports

Each tap has a built-in T connector on one side and a Medium-Attachment Unit (MAU) port on the other. This port is where you plug in the AUI cable.

Figure 5-21.shows the AUI cable connecting to the 9200 controller AUI port on one end and to the MAU port on the transceiver at the other end.

5-24 Andover Controls Corporation

Cabling Configuration for Ethernet

Figure 5-21. AUI Cable Connecting 9200 Controller to Thin Coaxial Cable Transceiver

Female AUI Port on

9200

Controller

Male Connector on Transceiver Cable

AUI Cable Minimum of 20 in. (0.5 m) Maximum of 164 ft. (50 m)

Male Connecto r on MAU of Transceiver

Female Connector on Transceiver Cable

Thin Coaxial Cable

Transceiver

Figure 5-22.shows the thin coaxial bus with cable taps.

Figure 5-22. Controllers Connected to Transceivers on Thin Coaxial Bus via AUI

Cable

Thin Coaxial Cable

Max 606 ft. (185 m) with up to 30 Taps

Transceiver

}

AUI Cables (Between 20 in. (0.5 m) and 164 ft.

Each Controller Has Built-in AUI Port

The tap transforms the signal it receives from the AUI cable so that the signal can be sent down the coaxial cable.

(50 m))

Infinity Network Configuration Guide 5-25

Cabling Co nf ig uration for Ethern e t

You can have as many as 30 ta ps on a 606 ft (185 m) segment of th in coaxial cable. The distance between each tap must be a minimum of 20 in. (0.5 m).

The AUI cable to the transceiver from the controller or workstation can be up to 164 ft (50 m).

Why would you use this type of bus? Because it allows you to drop a cable from a tap on the bus to the controller or workstation. If you use T connectors instead, you cannot drop any cable from, for instance, a T connector in the ceiling to the controller or workstation. With T connectors, you must run the bus directly to the T connector and have the T connector directly on the controller board or workstation network card. With AUI cable, however, you can run the bus through the ceiling and then drop down from it. This alternative, often ref erred to as a “cable drop,” can be extremely convenient in many installations.

However, using AUI cable does add to the amount of total delay on the network and, thereby, does influence the total length of the network. You learn more about how delays influence the total length of the network later, when you attempt to use a variety of cable types in one network.

5-26 Andover Controls Corporation

Cabling Configuration for Ethernet

Forming a Star or Distributed Star Configuration with Thin Coaxial Cable Using EnergyLink 2500

To put more than 30 nodes on a thin coaxial Ethernet-EnergyNet, you can form stars. The way to form stars is to mount the EnergyLink 2500 inside the 9200 controller. The EnergyLink 2500 hub becomes the center of a star with a maximum of six additional thin coaxial arms.

As shown in Figure 5-23, when you connect thin coaxial cable directly to the hub ports, you should screw the bottom of a T connector to the hub, terminate one side of the T connector with a 50 Ω terminator, and connect coaxial cable to the other side of the T connector.

Figure 5-23. Ethernet-EnergyNet Coaxial T Connector

50 Ω Terminator

Coaxial Cable

Screws onto Coaxial Port of

Figure 5-24.shows a thin coaxial star with an EnergyLink 2500 hub at the center. This particular network has only a single controller or workstation on each arm of the star. In this configuration, you would terminate each node and terminate the other end of each two-node bus at the EnergyLink 2500.

Note that in this configuration, because you have more than two coaxial cables connecting to the hub, you must have an external power supply wired to the hub.

EnergyLink 2500

Infinity Network Configuration Guide 5-27

Cabling Co nf ig uration for Ethern e t

Figure 5-24. Thin Coaxial Star Topology Network

Thin Coaxial Cable can fo rm a star configuration with

EnergyLink 2500

Terminated Nodes

Max 606 ft. (185 m)

Coaxial or Twisted Pair Cable can connect

9200

to hub

External Power Supply required for more than two Coaxial

EnergyLink

2500

Hub

Terminated Nodes

Cables on hub

You can connect the central 9200 of the star to the hub using one of two alternate types of cable:

• Thin coaxial cable, running from the coaxial 10Base-2 connector inside the 9200 to a coaxial port on the EnergyLink 2500.

• Twisted pair cable, running from the RJ 45 10Base-T connector inside the 9200 to a twisted pair port on the EnergyLink 2500.

To further expand this star, you can add nodes onto each arm, so each one forms a bus.

Figure 5-25.shows a thin coaxial star with an EnergyLink 2500 hub at the center. This particular network has a bus with up to 29 controllers/workstations on each arm of the star.

5-28 Andover Controls Corporation

Cabling Configuration for Ethernet

Figure 5-25. Thin Coaxial Distributed Star Topology Network with a Single Hub

Thin Coaxial or Twisted Pair Cable Can Connect

9200

to Hub

Each Thin Coaxial Arm of a Star Can Be a Bus with up to 30 Nodes

Max 606 ft. (185 m) Up to 30 Nodes

EnergyLink

2500

You terminate the node at the end of each bus and terminate the coaxial port on the

EnergyLink 2500. Remember, you can also lengthen some buses with EnergyLink 2500s, as long as you never use more than four EnergyLink 2500s per network and

you observe the rules concerning inter-repeater links (IRLs). Figure 5-26.shows a distributed star topology with two cascaded hubs. Using this

kind of configuration, you can have up to 150 nodes on a single star. You can have up to four cascaded hubs, but should never exceed the Ethernet-EnergyNet maximum of 50 nodes.

Caution

Never cascade more than four hubs.

Hub

Infinity Network Configuration Guide 5-29

Cabling Co nf ig uration for Ethern e t

Figure 5-26. Thin Coaxial Distributed Star Topology Network with Two Cascaded Hubs

Thin Coaxial or Twisted Pair Cable Can Connect

9200

to Hub

You Can Cascade Together Multiple

EnergyLink 2500

s to Connect Multiple Thin Coaxial Stars

Max 606 ft.

Max 606 ft. (185 m) Up to 30 Nodes

If you want to put a node on the thin coaxial network with twisted pair cable, you can use a twisted-pair-to-coax adaptor (01-3004-001). The adaptor has a RJ 45 connector on one side and a male BNC connector on the other side.

The adaptor is effective for up to 327 ft (100 m) of twisted pair and 327 ft (100 m) of coaxial cable.

You can employ this kind of adaptor in situations where you want to connect a single node to the bus rather than forming a star. Since you can have a maximum of four EnergyLink 2500s , by using the adaptor you can save the hubs for situations where you really need them.

(185 m) Up to 30 Nodes

5-30 Andover Controls Corporation

Cabling Configuration for Ethernet

EnergyLink 2500 as a Node on Each Bus

On an arm of a star, you can actually have 30 nodes—29 of them controllers or workstations and one the EnergyLink 2500. When the center of the star joins multiple buses, which bus is the EnergyLink 2500 on? It is a node on each bus that terminates at the hub.

The next three figures each illustrate a way of putting together buses with the EnergyLink 2500.

Figure 5-27.shows the 9200 housing the EnergyLink 2500 and both units on the same coaxial bus.

Figure 5-27. Both 9200 and Hub on Same Thin Coaxial Bus

Both

9200

and

hub on same

Bus with Up to 28 Other Nodes

Thin Coaxial bus (This cable is part of the bus)

In this arrangement, since both the EnergyLink and the 9200 are on the sa me coa xial bus, that bus can have only 28 other nodes, because the 9200 and the hub are the other two nodes.

As shown in Figure 5-28, another way to connect the EnergyLink 2500 to a bus is to connect the bus directly to a coaxial por t on the hub so that the 9200 that houses the hub is on another coaxial bus. This way, because the bus does not include the 9200 housing the hub, it can have 29 other nodes. (Although not shown, you can have up to four coaxial buses on the hub.)

Infinity Network Configuration Guide 5-31

Cabling Co nf ig uration for Ethern e t

Figure 5-28. 9200 and Hub on Different Thin Coaxial Buses

Bus with Up to 28 Other Nodes

29th node on

bus to left

Figure 5-29.shows yet another alternative. This alternative is a way to join two coaxial buses that each have 29 controllers or workstations. The configuration connects each bus to an EnergyLink 2500 and has the 9200 that hous es the hub con- nect to the hub using twisted pair cable.

Hub is on this Thin Coaxial Bus, and the

9200

that houses the Hub is on another bus (shown to the left)

Bus with up to 29 other nodes

Figure 5-29. 9200 Not on a Bus and EnergyLink 2500 Central Hub for Two Thin Coaxial

Buses

Single Central

9200

Connected to Hub with Twisted Pair Cable

Other Buses Connected Directly to Hub Ports

Bus with up to 29 other nodes

Remember, whenever you use twisted pair cable, you connect only two nodes; in this case those nodes are the 9200 and the EnergyLink 2500.

Bus with up to 29 other nodes

Rules for Thin Coaxial Cable Distributed Star Topol ogy Networks

You must adhere to the following when creating a thin coaxial cable bus topology Ethernet-EnergyNet:

• To use T connectors:

5-32 Andover Controls Corporation

Cabling Configuration for Ethernet

— Terminate the controllers at both ends of an arm by screwing

a 50 Ω terminator into the T connector on each controller. To terminate a workstation, refer to the instructions included with the network interface card.

— Use Andover Controls T connectors (Andover Controls Model

# 2070) to connect controllers or workstations directly to the bus.

• To use cable taps: — Use Andover Controls thin coaxial cable taps to tap directly into the thin

coaxial cable and then run AUI cable from the tap to the controller or workstation AUI port.

— Connect each controller/workstation to the cable tap with up to 164 ft (50

m) of AUI cable.

•Use an EnergyLink 2500 as the cent er of the star .

• Keep the length of an arm or cable segment at a maximum of 606 ft (185 m).

• Keep the maximum number of nodes per arm to 30, including the EnergyLink

2500. This means the following:

You can have up to 29 controllers and/or workstations on a bus that connects directly to the

On a bus that includes both the hub and the

EnergyLink 2500

9200

controller that houses it, you can have up to 28 additional controllers and/or workstations.

• Remember, the EnergyLink 2500 is a node on every bus that connects to it.

• Be sure each piece of cable from node to node or cable tap to cable tap is a minimum of 20 in (0.5 m) long.

• Connect the EnergyLink 2500 to the controller that houses it using twisted pair cable to maximize the number of nodes on the thin coaxial bus.

• You can add segments to the network using EnergyLink 2500.

• Keep the total network length at a maximum of 3,033 ft (925 m).

Infinity Network Configuration Guide 5-33

Cabling Co nf ig uration for Ethern e t

Forming a Two-Node Bus Configuration with Fiber Optic Cable

Andover Controls recommends you use glass fiber optic cable for running EthernetEnergyNet cable between buildings or through a high-noise environment. You may choose to form an entire bus of fiber optic cable or merely extend another type of network between buildings with fiber optic cable.

Suppose you want to connect a 9200 controller to another 9200 controller using fiber optic cable.

How do you connect fiber optic cable to a controller when it has connectors for coaxial cable, twisted pair, and AUI cable, but no connector for fiber optic cable? You run either thin coaxial or twisted pair cable from the controller to an EnergyLink 2500. The EnergyLink 2500 should have at least one module for either twisted pair or thin coaxial cable. The other modules ca n all be for fiber optic ca ble. You then run fiber optic cable from one EnergyLink 2500 to another, cascading them together.

Figure 5-30.shows a two-controller fiber optic bus topology network with EnergyLink 2500s (you can have the same arrangement with workstations or a controller and a workstation). You cannot have any nodes along the bus between these two controllers, because you can never have more than two nodes on a single segment of fiber optic cable.

Figure 5-30. Tw o-C on t rol l er Fi ber Optic Bus Top ol ogy

Ethernet-EnergyNet

Since Thin Coaxial Cable

Can Be Thin Coaxial

or Twisted Pair

Cable Connecting

Buses Must Be Terminated at Both Ends of the Coaxial Connector, This Port on the Hub Is Terminated

Controller to Hub

Fiber Optic Cable

Max 6,561 ft. (2000 m)

5-34 Andover Controls Corporation

EnergyLink

2500

Cabling Configuration for Ethernet

You can also put workstations on the fiber optic bus by connecting cable to the fiber optic port on the network interface card of the workstation (01-4004-017 for an AT computer, 01-4004-021 for a PS/2 computer).

Infinity Network Configuration Guide 5-35

Cabling Co nf ig uration for Ethern e t

Lengthening the Fiber Optic Bus

To lengthen the fiber optic bus, you add another node the same way you put the first two controllers onto the bus. You can have up to four repeaters, so you can add a maximum of four controllers onto the bus.

Figure 5-31.shows a four-controller fiber optic bus topology with EnergyLink 2500s. (This bus actually has eight nodes, including the EnergyLinks.)

Figure 5-31. Fo ur- C o nt ro lle r Fi ber Optic Bus Top ology

Coaxial or Twisted Pair Cable

Max 6,561 ft.

(2000 m)

Fiber Optic Cable

Total Network Cannot Exceed 19,683 ft. (6000 m)

5-36 Andover Controls Corporation

Forming a Star Configuration with Fiber Optic Cable

You can also use the EnergyLink 2500 to form a fiber optic star. The EnergyLink 2500 can have up to seven fiber optic ports. You need, however, to

have at least one port on each hub be either a twisted pair or coaxial cable port so that you can connect the 9200 controller to the hub.

Figure 5-32.shows a four-arm fiber optic star topology with EnergyLin k 2500s. Notice that this star does not require an external power supply for the hub. The hub requires external power when you have more than four fiber optic cables connected to it.

Figure 5-32. Four- A r m Fib er Opt i c Star Topology

Cabling Configuration for Ethernet

Max 6,561 ft.

(2000 m)

Total Network (including All Arms) Cannot Exceed 19,683 ft. (6000 m)

As you can imagine, you would soon run out of hubs this way. So how can you have a star with more controllers or workstations? One way is to connect single controllers to a fiber optic bus using thin coaxial cable and a coax-to-fiber adaptor (01-3004-002). You insert the adaptor where you have the EnergyLink 2500 on each arm of the star.

The adaptor has a male BNC connector (for coaxial cable) on one side and an ST connector (for fiber optic cable) on the other side.

The adaptor is effective for up to 327 ft (100 m) of coaxial cable and 3,270 ft (100 m) of fiber optic cable.

Infinity Network Configuration Guide 5-37

Cabling Co nf ig uration for Ethern e t

Since you can have more adaptors than hubs, you can have up to six nodes on the star by using the adaptor and still have the option of using three more hubs somewhere else.

Figure 5-33.shows a six-arm fiber optic star topology with one EnergyLink 2500 and several coax-to-fiber adaptor cards. In this arrangement, you have more than four fiber optic cable ports on the hub, so you must have an external power supply for it. (The star actually has seven arms, but the seventh is formed with coaxial cable.)

Figure 5-33. Six-Arm Fiber Optic Star Topology Employing Coax-to-Fiber Adaptors

Fiber Optic Cable Connecting from

EnergyLink 2500

to Adaptors

Max 6,561 ft.

(2000 m)

Fiber Optic Cable

Coax-to-Fiber

Coaxial Cable

Adaptor

Connecting Controllers to Coax-to-Fiber Adaptors

To expand a small star, you could have stars on the end of each arm of the star. How?

5-38 Andover Controls Corporation

Andover Controls Infinity Configuration Guide

Specifications and Main Features

Frequently Asked Questions

User Manual

Preface

Contents

Chapter 1

Introducing Local Area Networks

What Is a Local Area Network?

What Is a Controller?

What Is a Workstation?

What Is a File Server?

What Is a Node?

What Is Network Topology?

What Is Bus Topology?

What Is Star Topology?

What Is a Central Hub?

What Is Ring Topology?

Active Hubs Types

Modular Active Hubs

Nonmodular Active Hubs

Active Lin ks

EnergyNet Active Hubs

EnergyLink 2000 (ARCNET-EnergyNet)

EnergyLink 2500 (Ethern et-EnergyNet)

LAN Cable Types

What Is Coaxial Cable?

What Is Twisted Pair Cable?

What Is Fiber Optic Cable?

How Fast Is Data Transmitted?

LAN Data Transmission

What Is Token Passing?

What Is CSMA/CD?

What Are Signaling Methods?

What Is Baseband?

What Is Broadband?

What Is Carrierband?

Advantages of Baseband Over Broadband

LAN Communications

What Are Software Drivers?

What Is a Network Operating System?

Chapter 2

Understanding ARCNET-EnergyNet

What Is ARCNET-EnergyNet?

What Are the Nodes o n ARCNET-Ener gyNet?

Why Is Token Passing Effective?

What Is the Hub of ARCNET-EnergyNet?

What Are Components of EnergyLink 2000?

How Do You Read EnergyLink 2000’s LEDs?

What Is the ARCNET-EnergyNet Network Interf ace Card?

Chapter 3

Preparing Coaxial Cables

Forming Simple Bus Configurations

Point-to-Point Connections with Coaxial Cable

A Simple Coaxial Cable Bus Topology

A Coaxial Cable Bus Topology with Workstations

Rules for All Coaxial Cable Bus Topology Networks

A Simple Coaxial Cable Star Topology

Switching Cable Types with EnergyLink 2000s

Fiber Optic Bus Topology with EnergyLink 2000s and 2101s

Rules for Fiber Opt ic N et wo rks

Employing EnergyLink 2000s in Complex Configurations

Distributed Star Topology with En ergyLink 2000s

Expanding the Network with EnergyLink 2000s

Rules When Using EnergyLink 2000s in a Distributed Star Topology

Cascading EnergyLink 2000s

Extending a Bus with an EnergyLink 2000

Planning Your Cabling Configuration

Measuring Cable Lengths

Selecting a Cable Type

Calculating Total Delays on Long Networks

Summary of Node Connection Rules for All ARCNET-EnergyNet Topologies

Chapter 4

Understanding Ethernet-EnergyNet

What Is Ethernet-EnergyNet?

What Are the Nodes on Ethernet-EnergyNet?

Why Is the CSMA/CD Access Method Effective?

What Is the Hub of Ethernet-EnergyNet?

What Are Components of EnergyLink 2500?

How Do You Set the Repeater Interface Controller (RIC) DIP Switch?