Optelecom-nkf 9000 series User manual

9000 Series

Installation and Operation Manual

Model 9971-C

10 Base T to High-Speed Port Interface Card

For transport of a 10 Base T Ethernet signal via the duplex

high-speed port available on selected models of Optelecom video

transmission cards

UM50314, Manual 9971-C, ECO23616, Rev. D

Table of Contents

Section Page

Safety Instructions ii

Functional Description 1

9971-C Indicator and Connector Locations 2

Set Up and Operation of the 9971-C 4

Typical Application Drawing 18

Troubleshooting 9971-C Links 18

Operation with the Network Management Software 19

Specifications 20

UM50314, Manual 9971-C, ECO23616, Rev. D

The optical devices used in this equipment are Hazard Level 1M. As required by IEC60825-1, the installer is responsible for insuring that the label

depicted below is present in the restricted locations where this equipment is installed.

This assembly contains parts sensitive to damage by electrostatic discharge (ESD). Use ESD precautionary procedures when

touching, removing, or inserting parts or assemblies.

The chassis into which this unit is installed must be housed in a properly rated NEMA enclosure.

When this unit is operated in extremely elevated temperature conditions, it is possible for internal and external metal surfaces to

become extremely hot. Care should be taken to insure this unit is installed in a restricted area where only properly trained service

personnel have access to the unit.

Safety Instructions RM-3

This product may be electrically connected to products containing Class 1M lasers or LEDs.

• Class 1M laser product according to IEC60825-1:1993+A1+A2

•CAUTION: Use of controls or adjustments or procedures other than those specified herein may result in hazardous

radiation exposure.

• Precautions should be taken to prevent exposure to optical radiation when the unit is removed from its enclosure or when

the fiber is disconnected from the unit.

• Laser radiation may be present on a fiber connection to this unit even when the power has been removed from the unit.

• This unit is intended for installation in locations where only trained service personnel have access to the fiber connections.

• The locations of all optical connections are listed in the Connection Locations and Function section of this manual.

• Optical outputs and wavelengths are listed in the Specifications section of this manual.

The safety information contained in this section, and on other pages of this manual, must be observed whenever this unit is operated,

serviced, or repaired. Failure to comply with any precaution, warning, or instruction noted in the manual is in violation of the standards

of design, manufacture, and intended use of the unit. Optelecom-NKF assumes no liability for the customer’s failure to comply with any

of these safety requirements.

Hazard Level 1M The border shall be black and the

background shall be yellow.

LASER RADIATION

DO NOT VIEW DIRECTLY WITH OPTICAL INSTRUMENTS (MAGNIFIERS).

CLASS 1M LASER PRODUCT

CAUTION:

DISCONNECTED OPTICAL CONNECTORS MAY EMIT OPTICAL ENERGY.

DO NOT VIEW BEAM WITH OPTICAL INSTRUMENTS (MAGNIFIERS).

iii

Los dispositivos ópticos usados en este equipo son de Nivel de Riesgo 1M. Según lo exige la norma IEC60825-1, el instalador es responsable de

asegurar que la etiqueta descrita a continuación esté presente en las ubicaciones restringidas donde se instale este equipo.

Este ensamblaje contiene piezas sensibles al daño por descargas electrostáticas (ESD, por sus siglas en inglés). Use

procedimientos para prevenir las descargas electrostáticas al tocar, desmontar o insertar piezas o ensamblajes.

El chasis en el cual está instalada esta unidad debe estar dentro de un alojamiento debidamente calificado por NEMA.

Cuando se opera esta unidad en condiciones de temperatura sumamente elevada, es posible que las superficies internas y

externas de metal se pongan extremadamente calientes. Debe tenerse cuidado para asegurar que esta unidad se instale en un

área restringida donde sólo tenga acceso a la unidad el personal de servicio debidamente capacitado.

Instrucciones de seguridad RM-3

Este producto puede conectarse eléctricamente a dispositivos que contienen rayos láser o diodos emisores de luz Clase 1M.

• Producto láser Clase 1M conforme a la norma IEC60825-1:1993+A1+A2

•PRECAUCIÓN: El uso de los controles o ajustes o procedimientos aparte de lo especificado aquí puede ocasionar exposición peligrosa

a la radiación.

• Deben tomarse precauciones para evitar la exposición a la radiación óptica cuando se saque la unidad de su alojamiento, o cuando se desconecte la

fibra de la unidad.

• Puede haber radiación láser en una conexión de fibra a esta unidad aun cuando se haya eliminado la corriente de la unidad.

• Esta unidad está destinada a instalarse en ubicaciones donde sólo el personal de servicio competente tenga acceso a las conexiones de fibra.

• Las ubicaciones de todas las conexiones ópticas se enumeran en la sección Ubicaciones de las conexiones y funciones de este manual.

• Las salidas ópticas y longitudes de onda aparecen en la sección Especificaciones de este manual.

Debe observarse la información de seguridad contenida en esta sección, y en otras páginas de este manual siemptre que se opere, dé

servicio o repare esta unidad. Si no se cumple con alguna precaución, advertencia o instrucción indicada en este manual se infringen los

estándares de diseño, fabricación y el uso destinado a la unidad. Optelecom-NKF no asume ninguna responsabilidad si el cliente no

cumple con alguno de estos reequisitos de seguridad.

RADIACIÓN LÁSER

NO VER DIRECTAMENTE CON INSTRUMENTOS ÓPTICOS (DE AUMENTO)

PRODUCTO LÁSER CLASE 1M

PRECAUCIÓN:

LOS CONECTORES ÓPTICOS DESCONECTADOS PUEDEN EMITIR ENERGÍA ÓPTICA

NO VER EL HAZ CON INSTRUMENTOS ÓPTICOS (DE AUMENTO)

Nivel de Riesgo 1M El borde debe ser negro y

el fondo debe ser amarillo.

Die optischen Vorrichtungen in diesem Gerät haben Gefahrenstufe 1M. Wie vorgeschrieben durch IEC60825-1 ist der Installateur dafür verantwortlich,

sicherzustellen, dass die unten abgebildeten Schilder an den Orten mit eingeschränktem Zugang, an denen dieses Gerät aufgestellt ist, vorhanden sind.

Diese Baugruppe enthält Teile, die durch elektrostatische Entladungen (ESD) beschädigt werden können. Vorsichtsmaßnahmen

zum Schutz vor elektrostatischer Entladung treffen, wenn Teile oder Baugruppen berührt, ausgebaut oder eingefügt werden.

Das Gestell, in dem diese Einheit eingebaut ist, muss in einem entsprechend klassifizierten NEMA-Schutzgehäuse

untergebracht sein.

Wenn diese Einheit bei besonders hohen Temperaturen betrieben wird, können interne und externe Metallflächen extrem heiß

werden. Es muss darauf geachtet werden, dass diese Einheit in einem Bereich mit eingeschränktem Zugang aufgestellt wird,

damit nur geschultes Wartungspersonal Zugang zur Einheit hat.

Sicherheitsanleitungen RM-3

Dieses Produkt kann elektrisch an Geräte angeschlossen sein, die Laser oder LEDs der Klasse 1M enthalten.

• Laserprodukt der Klasse 1M gemäß IEC60825-1:1993+A1+A2

•VORSICHT: Wenn die Bedienungselemente anders als hier beschrieben bzw. andere Einstellungen verwendet werden, kann es zu

schädlicher Strahlenaussetzung kommen.

• Es müssen Vorsichtsmaßnahmen getroffen werden, um Aussetzung an optischer Strahlung zu vermeiden, wenn die Einheit aus dem Gehäuse

genommen oder die Faseroptik von der Einheit getrennt wird.

• In einer Faseroptik-Verbindung dieser Einheit kann auch dann Laserstrahlung vorhanden sein, wenn die Stromversorgung zur Einheit abgeschaltet wurde.

• Diese Einheit ist zum Einbau an Orten vorgesehen, an denen nur geschultes Personal Zugang zu den Faseroptik-Verbindungen hat.

• Die Lage aller optischen Verbindungen ist im Abschnitt über die Lage von Anschlüssen und Funktionsweise dieses Handbuchs zu finden.

• Optische Ausgänge und Wellenlängen sind im Abschnitt mit den technischen Daten dieses Handbuchs zu finden.

Die in diesem abschnitt und auf anderen seiten dieses handbuchs enthaltenen sicherheitsinformationen müssen befolgt werden, wenn diese einheit betrieben,

gewartet oder repariert wird. Falls vorsichtsmassnahmen, warnungen oder anweisungen in diesem handbuch nicht befolgt werden, verstösst dies gegen die

konstruktions, und herstellungsstandards und erfolgt im gegensatz zum vorgesehenen verwendungszweck dieser einheit. Optelecom-NKF übernimmt keine

haftung für das verabsäumnis des kunden, diese sicherheitsanforderungen einzuhalten.

LASER-STRAHLUNG

NICHT DIREKT MIT OPTISCHEN INSTRUMENTEN (LUPEN) ANSEHEN

LASER-PRODUKT DER KLASSE 1M

VORSICHT:

ABGEKLEMMTE OPTISCHE STECKVERBINDER KÖNNEN OPTISCHE ENERGIE FREI SETZEN

NICHT MIT OPTISCHEN INSTRUMENTEN (LUPEN) IN DEN STRAHL BLICKEN.

Gefahrenstufe 1M Schwarzer Rand und

gelber Hintergrund.

Les appareils optiques utilisés dans cet équipement correspondent à un niveau de danger 1M. Comme exigé par la norme IEC60825-1, il incombe à

l’installateur de s’assurer que l’étiquette ci-dessous est présente aux endroits d’accès limité où cet équipement est installé.

Cet ensemble contient des pièces sensibles aux décharges électrostatiques (ESD). Prendre les précautions relatives aux ESD avant

de toucher, retirer ou insérer des pièces ou des ensembles.

Le châssis dans lequel est installé cet appareil doit être placé dans une enceinte NEMA conforme aux spécifications nominales.

Lorsque cet appareil fonctionne à une température ambiante extrêmement élevée, il est possible que les surfaces métalliques

internes et externes deviennent extrêmement chaudes. S’assurer que cet appareil est installé dans une zone dont l’accès est

limité à un personnel de maintenance correctement formé.

Consignes de sécurité RM-3

Ce produit pourra être branché par un câble électrique à des appareils qui contiennent des lasers de classe 1M ou des diodes

électroluminescentes.

• Produit laser de classe 1M conformément à IEC60825-1:1993+A1+A2

•ATTENTION: L’utilisation de commandes ou réglages, ou de procédures différentes de celles indiquées ici risque de

provoquer une exposition dangereuse au rayonnement.

• Prendre des précautions pour empêcher une exposition au rayonnement optique lorsque l’appareil est retiré de son

boîtier ou lorsque le câble optique fibre est débranché de l’appareil.

• Un rayonnement laser pourra être présent dans un câble optique branché sur cet appareil, même une fois l’alimentation coupée.

• Cet appareil est prévu pour une installation à des endroits où seul un personnel de maintenance formé a accès aux câbles optiques.

• Les points de branchement de tous les câbles optiques sont indiqués à la section Points de branchement et fonction de ce manuel.

Les consignes de securite contenues dans cette section et dans le reste de ce manuel doivent etre respectees a chaque fois que cet appareil

est utilise ou fait l’objet d’une maintenance ou d’une reparation. Le non-respect d’une precaution, d’un avertissement ou d’une instruction

figurant dans ce manuel est une violation des normes de conception, fabrication et indication d’usage de l’appareil. Optelecom-NKF n’est

pas responsable du non-respect de ces consignes de securite par le client.

RAYONNEMENT LASER

NE PAS REGARDER DIRECTEMENT AVEC DES INSTRUMENTS OPTIQUES (LOUPES)

PRODUIT LASER DE CLASSE 1M

ATTENTION:

LES CONNECTEURS OPTIQUES DEBRANCHES PEUVENT EMETTRE UNE ENERGIE OPTIQUE.

NE PAS REGARDER LE FAISCEAU AVEC DES INSTRUMENTS OPTIQUES (LOUPES)

Niveau de danger 1M La bordure doit être noire et

le fond jaune.

Functional Description

A pair of 9971-C interface cards provide transmission for one 10 Base T Ethernet link and two independent 115

Kbps data channels via the duplex high-speed ports available on selected video or data over fiber transmission

cards. Currently, the 9971-C will operate with the 9252DT/DR, the 9421DT/DR, and the 9672 cards.

The cards operate on 6VDC as supplied by the chassis into which it is installed.

9971-C Indicator and Connector Locations

FIGURE 1

1. LINK INDICATOR

This indicator illuminates green when the RJ45 Ethernet port is connected to an active Ethernet connection.

2. FDUP INDICATOR

This indicator illuminates green when the RJ45 Ethernet port is operating in the full duplex mode.

3. HDUP INDICATOR

This indicator illuminates yellow when the RJ45 Ethernet port is operating in the half duplex mode.

4. ERR INDICATOR

This indicator illuminates red when the local RJ45 Ethernet port is operating full duplex and 9971-C at the

other end of the optical link is operating in half duplex or vice versa.

5. Rx INDICATOR

This green LED blinks when the RJ45 Ethernet port is receiving data.

6. Tx INDICATOR

This green LED blinks when the RJ45 Ethernet port is transmitting data.

7. 10 BASE T ETHERNET CONNECTOR

This RJ45 connector is the MIDX compatible Ethernet connector. It operates like a hub port and will

connect with a standard cable to a PC or other device. When connecting to a hub, use either the a

standard cable to uplink port on the hub or a crossover cable to a standard hub port.

8. LOOP INDICATOR

This three-color indicator provides status on the high-speed port connection to the opposite end of the link

• If red (No Sync, No Loop), there is a problem with the signal being received from the opposite end of

the link.

• If yellow (Sync, No Loop), the local receiver is receiving a good signal from the far end, but the far

end is not receiving the signal from the local end.

• If green (Sync, Loop), the local receiver has a good signal and the remote receiver is reporting a good

signal.

9. HIGH-SPEED PORT CONNECTOR

This RJ45 connector connects to the high-speed port on the fiber communication card via the provided

standard Cat5 Ethernet cable.

10. CHANNEL 1 DATA I/O CONNECTOR

This removable screw type connector serves as the I/O cable for data channel 1.

11. CHANNEL 2 DATA I/O CONNECTOR

This removable screw- type connector serves as the I/O cable for data channel 2.

12. S1 DIPSWITCH

This dipswitch sets half/full duplex mode for the Ethernet link.

Set Up and Operation of the 9971-C

Set up and operation of the 9971-C cards consists of setting the data port switches, installing the unit into a

Series 9000 chassis, connecting the provided Cat5 jumper cable from the high-speed port on the optical

communications card to the 9971-C. Any standard (not crossover) RJ45 Cat5 cable will also work correctly.

The card should be removed to set dipswitch S1, as the switch is only read during the power up cycle.

Setting S1 Dipswitch

TABLE 1

Switch S1 NOTE: Both ends of a 9971 link must be

operating in the same mode.The error LED will

illuminate if they are not operating in the same

mode.

Position 1 Position 2 Function

On On Half Duplex: Select this mode if one or both 9971s

are to be connected to half duplex device such as

a hub.

On Off Full Duplex: Select this mode if both 9971s are

connected to devices that are set/forced to

10 mbs full duplex.

Off Off Auto-Negotiate: Select this mode when connecting

to 10/100 full duplex device, such as a switch.

NOTE: This mode is, strictly speaking, not valid

for a 10 mbs only device such as a 9971. The

Auto-Negotiate process may fail when connecting

to a switch that already has heavy traffic running.

The failure can be observed by the fact that the full

duplex LED is blinking. The workaround is to

temporarily remove the source of the traffic until

the 9971 Auto-Negotiate completes.

Limitations for Half Duplex

When an Ethernet link operates in the half duplex mode, there are limitations imposed on the end-to-end

length of the system. Operating on fiber does not change these limitations and the user should be aware

that, in general, the collision domain limits the total network diameter to 4000 meters or less, including fiber

runs. If portions of the system are operating at 100 Mbps, the distances may be less.

Setting the Data Port Mode Switches

The 9971-C supports two Data Option Module Type B Plug-ins. The switches on each one are identical and are

set according to the charts below.

Option Module Type B — Duplex Data

SET UP

Compared to the first and interim versions, the latest version has an additional bias switch to set for more robust RS485

operation of the data module. The bias resistors keep the differential signal pair biased so that when it is in a High-Z state the

line receivers interpret the line as being inactive (no data transmitted). Refer to Table B-2 for connector and switch locations.

• Left hand connector row(s) (nine pins each).

• Switch S1: This eight position dipswitch is used in conjunction with dipswitches S2 and S3 to select the

data interface. Refer to Table B-2 for setting this switch.

• Switch S2: This six position dipswitch is used in conjunction with dipswitches S1 and S3 to select the data

interface. Refer to Table B-2 for setting this switch.

• Switch S3: This four position dipswitch is used in conjunction with dipswitch S1 and S2 to select the data

interface. Refer to Table B2 for setting this switch.

• Right hand connector rows (seven pins each).

NOTE:Both inputs and outputs on both ends of the link are set independently and can be configured as different

data types. This allows different interface settings on each input and output on both ends of a data link. For

example, one end of the link could be configured for RS232 and the other for RS485 4-wire. The Option Module

converts the data in and out to the selected data types. This eliminates the need for data converters.

NOTE: Use this table only for the latest version.

TABLE B-2 — INTERFACE SELECTION TABLE

Data Interface Settings (Latest Version)

Input/Output Type Switch S1 Switch S2 Switch S3

123456781234561234

RS232 Input OFF ON OFF OFF OFF

RS232 Output OFF OFF ON OFF OFF OFF

RS422 Input T T ON ON T ON OFF ON ON* ON*

RS422 Output OFF OFF OFF OFF ON OFF OFF

RS485 4-Wire Input T T ON ON T ON OFF ON B B

RS485 4-Wire Output OFF ON OFF OFF ON B B

RS485 2-Wire (Duplex) T T ON ON T ON OFF ON ON ON OFF OFF B B

Manchester Input T T OFF OFF ON ON OFF ON OFF OFF

Manchester Output OFF OFF ON OFF ON OFF OFF

NOTES:

* Setting S3, positions 1 and 2, to the “On” position for RS422 insures that the input line receiver interprets

the input as “inactive” under all conditions if there is no active RS422 signal driving the input. If this is not

important, these switches can be left in the “Off” position.

• “T” indicates Termination Resistor. When set to the “On” position, the Termination Resistors are enabled;

“Off” disables the Termination Resistors. Refer to the Termination Rules Section.

• “B” indicates Bias Resistors. The bias resistors may be necessary on RRS485 systems to eliminate data

errors. Information on setting these resistors can be found in the Termination Rules section (page 17).

• Empty locations do not apply to the particular Input or Output type listed on the left side.

• When using bidirectional or duplex data, you must set both the input and output switches to the correct data type.

Option Module Type B — Duplex Data

EXTERNAL CONNECTIONS

Connections are made to the module via the 5-pin removable screw terminal connector. Refer to the

following tables and figures for the connection configurations. Note that on all signal connection drawings,

the arrows indicate signal flow direction.

RS232

Option Module type B supports 3-wire RS232 communications. The signal input to pin 1 of the terminal block

is transmitted to the other end of the link and is output on pin 3. Care must be taken to insure that the

external equipment is connected input to output and output to input.

TABLE B-3 — OPTION MODULE B RS232 SIGNALS AND CONNECTIONS

Pin # Function RS232 (DTE) Signal Name

1 Input RD

2 No Connection

3 Output TD

4 No Connection

5 Signal Common Common

RS232 Connections

COM

Optical

Link

Host

Card

Host

Card

Type B Option Module

Connected

Equipment

COM

Connected

Equipment

Optelecom-NKF Equipment

FIGURE B-4 — RS232 CONNECTIONS

RS422

Option Module B supports both 2-wire (simplex) and 4-wire (duplex) RS422 communications. RS422 is a

differential communications scheme and uses the polarity difference between the + and – leads to transmit

the data bits. The signals input on pins 1 and 2 at one end of the link are transmitted to the other end of the

link and are output on pins 3 and 4.

Different manufacturers mark their RS422 devices in different ways and there is no consistent common

terminal marking scheme. In RS422, when there is no data activity, the system is said to be in a mark state.

During data transmission, the system toggles between mark and space states. During idle (mark state), when

no data is being transmitted, the output + terminal will be positive with reference to the output – terminal.

Care must be taken to ensure that external equipment has its output terminals connected to the external

equipment input terminals. Connect + to + (plus) and – to – (minus).

RS422 is a “one-to-many” type system, permitting up to 10 receivers to be electrically connected to one

transmitter. Refer to the “Termination Rules for RS422, RS485, and Manchester” on page 15 for more details

on terminations to ensure you have terminated multiple connections correctly. Fiber connections isolates

each end of a system, effectively creating more than one electrical buss. A system controller for Pan, Tilt, and

Zoom (PTZ) could connect to up to 10 B-type Option Module inputs, with only the last input having the

termination enabled. At the other end of each link, each RS422 output could drive 10 more inputs. Since this

end of the link is optically isolated from the transmit end, it must be treated as a separate system and should

have the last input in the daisy chain terminated.

Although RS422 and RS485 are differential input communications standards and are more immune to noise

caused by poor grounding and electrical noise, the shielding and grounding of the signal wires is still important.

Signal grounds and shields should be connected at both ends on most signal runs. When the ground potential

of one end of the electrical connection is at a different potential than the other, the voltage differential can

exceed the maximum common mode immunity of the input circuits and cause improper operation of the

equipment. If this voltage should become exceedingly large due to lightning or static buildups, damage to the

signal inputs is possible. Connecting the ground (and shield) connections on both ends reduces this potential.

Data connections in outdoor locations (traffic and external security systems, for example) are especially

vulnerable to these kinds of problems and should have grounds connected at both ends of the wiring. In

addition, power, data, and video signals should have noise and surge protection modules installed in the lines

ahead of the communications equipment.

Refer to the section on “Termination Rules’ for more details on RS422 termination.

TABLE B-4 — OPTION MODULE B RS422 SIGNALS AND CONNECTIONS

Pin Number Function

1 Input +

2 Input –

3 Output +

4 Output –

5 Signal Common

RS485

Option Module B supports both 2-wire (duplex) and 4-wire (duplex) RS485 communications. RS485 is a

differential communications scheme and uses the polarity difference between the + and – leads to transmit

the data bits. It is similar to RS422, but has the capability of paralleling transmitters because the transmitters

are tristated (shut off) when not actually transmitting data. Because of this, a duplex or bidirectional link can

be operated on either two or four wires. In 4-wire operation, the signals input on pins 1 and 2 at one end of

the link are transmitted to the other end of the link and are output on pins 3 and 4, respectively. For 2-wire

operation, the signals input on pins 1 and 2 at one end of the link are transmitted to the other end of the link

and are output on pins 1 and 2.

Different manufacturers mark their RS485 devices in different ways and there is no consistent common

terminal marking scheme. During data transmission, the system toggles between mark and space states.

Care must be taken to ensure that external equipment has its output terminals connected to the Option

Module input terminals and the Option Module output terminas are connected to the external equipment

input terminals. Generally speaking, connect + to + (plus) and – to – (minus). In rare cases, you may have to

connect the Option Module + (plus) to the external equipment – (minus) and the Option Module – (minus) to

the external equipment + (plus).

RS422 2-Wire Connections

(Simplex)

Optical

Link

Host

Card

Host

Card

Type B Option Modules

TX+

TX–

GND

COM

Connected

Equipment

RX+

RX–

GND

COM

Connected

Equipment

Optelecom-NKF Equipment

FIGURE B-6 — RS422 2-WIRE SIMPLEX CONNECTIONS

RS422 4-Wire Connections (Duplex)

Optical

Link

Host

Card

Host

Card

Type B Option Module

TX+

RX+

TX–

RX–

GND

COM

TX+

RX+

TX–

RX–

GND

COM

Connected

Equipment

Connected

Equipment

Optelecom-NKF Equipment

FIGURE B-5 — RS422 4-WIRE DUPLEX CONNECTIONS

RS485 2-Wire Connections (Duplex)

Optical

Link

Host

Card

Host

Card

Type B Option Modules

–

GND

COM

Connected

Equipment

–

GND

COM

Connected

Equipment

Optelecom-NKF Equipment

FIGURE B-7 — RS485 4-WIRE CONNECTIONS (DUPLEX)

RS485 4-Wire Connections (Duplex)

Optical

Link

Host

Card

Host

Card

Type B Option Module

TX+

RX+

TX–

RX–

GND

COM

Connected

Equipment

TX+

RX+

TX–

RX–

GND

COM

Connected

Equipment

Optelecom-NKF Equipment

FIGURE B-8 — RS485 2-WIRE CONNECTIONS (DUPLEX)

TABLE B-5 — OPTION MODULE B RS485 SIGNALS AND CONNECTIONS

Pin Number Function

4-Wire 2-Wire

1 Input + Input/Output +

2 Input – Input/Output –

3 Output + Internally Connected to Pin 1

4 Output – Internally Connected to Pin 2

5 Signal Common — Chassis Ground

TABLE B-6 — OPTION MODULE B MANCHESTER SIGNALS AND CONNECTIONS

Pin Number Function

1 Input +

2 Input –

3 Output +

4 Output –

5 Signal Common

RS485 is a “many-to-many” type system, permitting up to 32 devices or receivers to be electrically connected

to one transmitter. Refer to the “Termination Rules for RS422, RS485, and Manchester” later in this section for

more details on terminations to ensure you have terminated multiple connections correctly. The fiber

connection isolates parts of a system, effectively creating more than one electrical buss. A system controller

for Pan, Tilt, and Zoom (PTZ) could connect to up to 32 B-type Option Module inputs with terminations

required on both physical ends of the buss having the termination enabled. At the other end of each optical

link, each RS485 I/O could interface with 31 other I/Os. Since this end of the link is optically isolated from the

transmit end, it must be treated as a separate system and has each end of its bus terminated.