Moxa Technologies 5400 Series user manual Adjustable Pull High/low Resistors for the RS-485 Port

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NPort 5400 Series User’s Manual

Getting Started

Adjustable Pull High/low Resistors for the RS-485 Port

In some critical environments, you may need to add termination resistors to prevent the reflection of serial signals. When using termination resistors, it is important to set the pull high/low resistors correctly so that the electrical signal is not corrupted. Since there is no resistor value that works for every environment, DIP switches are used to set the pull high/low resistor values for each RS-485 port.

To set the pull high/low resistors to 150 KΩ, make sure both of the assigned DIP switches are in the OFF position. This is the default setting.

To set the pull high/low resistors to 1 KΩ, make sure both of the assigned DIP switches are in the ON position.

Pull high/low resistors for the RS-485 Port

	SW	1	2	3

		Pull High	Pull Low	Terminator
	ON	1KΩ	1KΩ	1KΩ

Default	OFF	150KΩ	150KΩ	---

ATTENTION

Do not set the resistors to 1 KΩ when using RS-232. Doing so will degrade the RS-232 signals and reduce the effective communication distance.

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Contents Sixth Edition, March NPort 5400 Series User’s ManualTrademarks Copyright NoticeDisclaimer Table of Contents Chapter IP Serial LIB Introduction Product Features Package ChecklistOverview Product Specifications Power Requirements Software FeaturesSerial Communication Parameters MechanicalGetting Started ‰ Panel Layout ‰ Connecting the HardwareNPort 5410/5450/5450I Panel LayoutNPort 5430/5430I Wiring Requirements Connecting the HardwareConnecting the Power Grounding the NPortConnecting to a Serial Device Connecting to the NetworkLED Indicators LED Name LED Color LED FunctionPull high/low resistors for the RS-485 Port Adjustable Pull High/low Resistors for the RS-485 PortInitial IP Address Configuration Default IP address Factory Default IP AddressInitializing the NPort’s IP Address LCM DisplayDetailed Menu Options Button Name ActionInact. time Delimiter ARP NPort Administration SuiteTelnet Console Page Page Choosing the Proper Operation Mode Real COM Mode TCP Server Mode UDP Mode TCP Client ModePair Connection Mode Disabled Mode Reverse Telnet ModeWeb Console Configuration Opening Your Browser NPort 5400 Series User’s Manual Web Console Configuration Time Basic SettingsServer name Time zoneWeb/Telnet Console LCM password protectTime server Web consoleReset button protect Network SettingsMethod Function Definition IP Address IP ConfigurationNetmask GatewayIP Address Report Snmp SettingsSetting Factory Default Necessity 4002 Optional Serial SettingsAuto report to IP Auto report to UDP portSerial Parameters Real COM Mode Operating SettingsInterface Max. Connection Max ConnectionMax Connection 2 to Ignore jammed IPSetting Factory Default Necessity To 65535 ms Optional Setting Factory Default Necessity To FF None OptionalDelimiter Delimiter processSetting Factory Default Necessity To 99 min Min Optional TCP Server ModeTCP alive check time Inactivity timeAllow driver control Delimiter Setting Factory Default Necessity 4001 Required TCP Client ModeCommand port Setting Factory Default Necessity 966 OptionalNPort 5400 Series User’s Manual Web Console Configuration Delimiter Destination IP address 2/3/4 Destination IP addressDesignated Local Port 1/2/3/4 Connection controlConnect/Disconnect Description UDP ModeDelimiter process Pair Connection Master Mode Pair Connection ModeLocal listen port Setting Factory Default Necessity To 99 min Min Required Pair Connection Slave ModeSetting Factory Default Necessity To 99 min Optional Reverse Telnet ModeSetting Factory Default Necessity 4001 Optional Means it will never disconnectDisabled Mode Accessible IP SettingsOnly one host of specific IP address can access the NPort Hosts on the specific subnet can access the NPortAuto warning E-mail and Snmp trap Auto Warning SettingsMail Server Snmp Trap Server Event TypeDCD changed Password changedDSR changed MailMonitor Monitor Async-SettingsMonitor Line Monitor AsyncLoad Factory Default Change Password‰ Overview ‰ Installing NPort Administrator ‰ Configuration Configuring NPort AdministratorInstalling NPort Administrator Page Page Configuration Specify by IP Address Broadcast SearchUnlock Password Protection Password ProtectionConfiguring the NPort Page Page Upgrading the Firmware Web ConsolePage Import Configuration Export ConfigurationBroadcast Search Æ Monitor Æ Add Target Monitor Æ Add Target Æ Rescan Once the Monitor function is running Monitor Æ Load Configured COM PortPage Page Page Port Monitor On-line COM Mapping COM MappingPage Fast Flush only flush local buffer Page Page Off-line COM Mapping Page IP Address Report Automatic Message Log IP Serial LIB Why Use IP Serial Library? What is IP Serial Library?How to install IP Serial Library? Example Program IP Serial LIB Function GroupsServer Control Port Control Input/Output Data Port Status MiscellaneousPinouts and Cable Wiring Ethernet Port Pinouts Serial Port Pinouts Port Pinout DiagramsEthernet Cables Serial Cables Cable Wiring DiagramsDB9 Female to DB9 Male for NPort DB9 Female to DB25 Male for NPort Well Known Port Numbers TCP Socket Application ServiceNPort 5400 Series User’s Manual Well Known Port Numbers UDP Socket Application ServiceIP MIB Icmp MIB Snmp Agents with MIB II & RS-232 like groupAddress Translation MIB System MIB Interfaces MIBTCP MIB Snmp MIB Input Signal Table Output Signal TableAuto IP Report Protocol Info n Auto IP Report FormatID List AP ID & Hardware ID Mapping TableService Information Following services are provided Moxa Internet ServicesMoxa Product† NPort Problem Report FormSerial Number Product Return Procedure