Samsung SSA-P102T/EXP manual EARTH-GROUNDING the Communication Cables, Host PC

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EARTH-GROUNDING THE COMMUNICATION CABLES

We recommend you to use a proper grounding system for the communication cables.

The best grounding method is to earth-ground the shield wire of the communication cable. However, the earth-grounding of the communication cable is not easy at all, and it also causes an increased installation cost. There are three grounding points available for installation:

1.Earth Ground

2.Chassis Ground

3.Power Ground

The most important thing about the earth-grounding lies in connecting neither end of the shield wire to the grounding system simultaneously. This will cause a current flow through the shield wire when the voltage level of both ends of the shield wire is not equal and this current flow will introduce some noise and interference to communications.

It is recommended to connect ONLY one end of the shield wire of the communication cable to the grounding system. If you can locate an earth-grounding point nearby, connect one end of the shield wire to that point. If you could hardly locate an earth grounding point nearby, connect one end of the shield wire to the chassis ground point. If you could locate neither of an earth or chassis grounding point nearby, connect one end of the shield wire to the power ground point (GND). Note that if the chassis ground is not properly connected to the earth and floated from the ground level, grounding to the chassis ground will yield the worst communication performance. If this is the case, use the power ground point rather than the chassis ground.

INSTALLATION AND EXTERNAL CONNECTION

HOST PC

RS-422/RS-232

RS-232Converter

RS-422

RS-422 Cable

Communication

Wires Connect ShieldWire Open

Earth Ground

or Chasis Ground or Power Ground

RS-422

RS-422

RS-422

GND

GND

GND

GND

SSA-P102 #1

SSA-P102 #2

SSA-P102 #3

SSA-P102 #n

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Contents Please visit our website Access Control PanelSafety information Safety informationImportant Safety Instructions Contents Product introduction FeaturesWHAT’S Included Door Open Alarm and Forced Door Open AlarmHoliday Setup Duress ModeMain Board Input #2 Buzzer control settingsPower LED Displays the status of the power supply Input #3Cable Selection Termination Resistor in RS-422 Communication Connecting the Termination Resistor and DiodeTermination Resistor Bypass Diode ConnectionHost PC EARTH-GROUNDING the Communication CablesReader Connection POWER, READER, and I/O ConnectionPower Connection Check the location of the power portInput Connection Output Connection GND Communication Line ConnectionRS-232 Communication Port Connection Host PCRX+ TX+ RS-422 Communication Port Connection StandaloneHost TX+ RX+SSA-P102 RS-422 Communication Port Connection Multiple UnitsTCP/IP Communication Connection TCP/IP Communication Port ConnectionHUB TCP / IP System Initialization Reader Input BIT SetupInitializing the system using the Initialize switch InitializationUse the switch to set the value Board ID SettingCommunication Speed Setup Problem Action TroubleshootingTroubleshooting System is in sync with the PC Service for your helpIrrelevant card number is displayed Product specifications Product SpecificationsCorrect disposal of batteries in this product

SSA-P102T/EXP specifications

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