Samsung SSA-P102 Connecting the Termination Resistor and Diode, Bypass Diode Connection

Page 10

installation and external connection

CONNECTING THE TERMINATION RESISTOR AND DIODE

Termination Resistor

A resistor is inserted for matching the line’s impedance to prevent distortion and reduction in RS-422 or RS-485 long distance data communications, which is referred to as termination resistor.

Note that termination resistors of lower than 90 accepted for the communications system.

"	RS-485	RS-485		A
RS-485/RS-232
Converter
#	120Ω		120Ω	B
	Termination Resistors
				Last SSA-P102
	<Termination Resistor in RS-485 Communication>
			120Ω
	TX+		RX+
RS-485/RS-232	TX-		RX-
RS-485/RS-232	RS-422	RS-422
Converter	RS-422	RS-422
Converter	RX+		TX+
	RX-		TX-
120Ω				Last SSA-P102
	Termination Resistors

<Termination Resistor in RS-422 Communication>

Bypass Diode Connection

If you connected an inductor (door lock or alarm device) to the output relay, there should occur a voltage surge while the inductor was between turning on and turning off. If you do not connect a bypass diode to the relay, the voltage surge will cause damage to the electric circuit of the controller. To reduce this surge, it is recommended to connect a bypass diode to the relay.

DC+

DC-

SSA-P102Lock/Alarm

Cathode Anode

1N4004 ~ 1n4007 or equiv.

10_ installation and external connection

Image 10

Contents Access Control Panel Please visit our websiteSafety information Safety informationImportant Safety Instructions This device may not cause harmful interference,Contents Features Product introductionDuress Mode Door Open Alarm and Forced Door Open AlarmHoliday Setup WHAT’S IncludedMain Board Input #3 Buzzer control settingsPower LED Displays the status of the power supply Input #2Cable Selection Bypass Diode Connection Connecting the Termination Resistor and DiodeTermination Resistor Termination Resistor in RS-422 CommunicationEARTH-GROUNDING the Communication Cables Host PCCheck the location of the power port POWER, READER, and I/O ConnectionPower Connection Reader ConnectionInput Connection Output Connection RS-232 Communication Port Connection RS-232 Pin Female ConnectorCommunication Line Connection Check the location of the communication portRS-232C RS-422 Communication Port Connection StandaloneMAX m RS-422 Communication Port Connection Multiple Units SSA-P102TCP/IP Communication Port Connection TCP/IP Communication ConnectionUse the switch to set the value Reader Input BIT SetupInitializing the system using the Initialize switch InitializationCommunication Speed Setup Board ID SettingUse the switch to set the value Troubleshooting TroubleshootingProblem Action Properly established D0, D1 Service for your helpIrrelevant card number is displayed System is in sync with the PCProduct Specifications Product speciﬁcationsCorrect disposal of batteries in this product