Avaya 40DHB0002USBG manual RS485 Communication Systems, Ground Loops

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Wallboard Installation and Maintenance

Wallboard 22

 

 

 

 

 

 

RS485 Communication Systems

This standard officially allows 30 wallboards to be connected via a RS485 transmission cable of up to 1200 meters to a PC RS485 port.

The PC TX+ is connected to the wallboard RX+; similarly, the PC TX- is connected to the wallboard RX-. The recommended technique is to run a cable from the PC to the nearest wallboard then from this wallboard to the next nearest wallboard etc.

At the last wallboard on the bus it is necessary to connect a 120Ω terminating resistor between the wallboard RX+ and RX- connections using the supplied terminated RJ45 Plug and the RJ45 doubler.

The cable specification must include a twisted pair with an overall screen and characteristic impedance of 100 ohms.

Ground Loops

Proper operation of RS485 requires a signal return path. A third wire should connect all the system signal grounds together and is most often an additional shield conductor.

Distributed power systems in industrial applications may have differences in the AC power line grounds of several volts as measured from location to location. Ground differences that are greater than 5V RMS can destroy the RS485 transceivers. Loop currents can exist within the shield conductor because of these voltage potentials, causing data errors. Loop currents can be minimized by installing 100 ohm resistor in series with the cable shield and the RS485 Line Driver ground connection or by ensuring that the screen of the cable does not make contact with the wallboard frame earth. Spurs, which lead off from the main RS485 cable to a wallboard, should be kept to less than one meter long.

Compact Contact Center

Installation & Maintenance

40DHB0002USBG Issue 1 (11/14/2001)

Wallboard Installation and Maintenance • Page 39

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Contents Compact Contact Center Contents General IntroductionOverview System Software System SpecificationComputer Systems Expansion CardsConnecting the CCC Server Wallboard DevicesWallboard Agent Systems and below LimitationsClient PC Server PC Systems above 15 AgentsPC Configuration Create the C and SDX Shares Server PC Setup NT4Event Log Settings Windows NT Server 4.0 ModificationsFrom the Tools menu, click Assign Drive Letter Partition the DiskChange Base I/O Port Address to 2e8 Installation of Wallboard CardAdvantech ISA Wallboard Card Installation Advantech PCI Wallboard CardInstallation Definition dialog, select Client Tools Only Install Database ApplicationInstalling Msde Installing Microsoft SQLGuest Accounts Server PC Setup WindowsEvent Log Settings Windows 2000 ModificationsPartition the Disk Client PC Setup Windows NT Workstation Windows NT Workstation ModificationsMap Network Drive Windows 95 Modifications Client PC Setup WindowsWindows 98 Modifications Client PC Setup Windows 2000 Professional Installing CCC Install CCC ApplicationsReport Manager Trouble ShootingCCC Installation CCC Client applicationsAdministrator Rights System Supervisor No Name CCC User AccessStarting CCC User Access AdminSpdropserver Archiversql Change Server PC NameNT4 Server PC Change Server PC NameChange Odbc Settings Click on the Network Identification tab Windows 2000 ServerWindows 95/98 Change Client PC NamesOperating Systems Windows NT WorkstationWindows Administering the Database Telephone System RequirementsNaming Directory Numbers Report Manager Group ReportingIP400 in the Contact Center Environment Call Center View and Wallboard ManagerCCC reporting characteristics associated with Voice Manager Introduction Wallboard Installation MaintenanceInstallation WallboardCeiling Mounting Wall MountingNetwork Addressing RS485 Serial ConnectionSocket View Pin Mini-DIN Additional EquipmentConnection Details Compatible External DevicesLED Matrix Scanning Inspection Periodic Maintenance and InspectionCleaning Display Screen LED Illumination Test InspectionPin out Connections Serial Connection & Dip-Switch DetailsWallboard Terminal Box RJ45 Connector Pin Out Details Dip-Switch Details Network AddressTest Functions Baud RateGround Loops RS485 Communication SystemsWallboard Ceiling Mounting Dip-switch Number Serial Connection and ConfigurationIf switch 7 and 8 are on at a power reset RS485 System WiringPeriodic Maintenance & Inspection This page has deliberately been left blank Index Compact Contact Center

40DHB0002USBG specifications

The Avaya 40DHB0002USBG is a powerful and versatile device designed to meet the communication needs of modern businesses. Widely recognized in the realm of telecommunications, this product is part of Avaya's commitment to delivering advanced solutions that enhance productivity and collaboration in the workplace.

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Overall, the Avaya 40DHB0002USBG stands out as a premier choice for organizations looking to enhance their communication infrastructure. Its blend of superior audio quality, compatibility with Unified Communications, user-friendly design, security features, and flexible connectivity options makes it an essential tool for driving productivity and collaboration in the workplace. As businesses continue to evolve in a digital-first environment, solutions like the Avaya 40DHB0002USBG are poised to lead the way in effective communication strategies.
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