Connect Tech JB0 RS-485/422 Line Interface, Full Duplex Mode, Half Duplex Mode, Line Termination

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2-2 Chapter 2: Hardware Installation

RS-485/422 Line Interface

The Titan/cPCI adapters come with a jumper selectable RS- 485/422 electrical line interface for each port. The RS-485/422 electrical interface is a reliable high-speed serial link that offers superior noise immunity and multi-drop network connectivity. The RS-485/422 electrical interface is also a superset of the RS- 422 electrical interface. Titan/cPCI adapters offer full RS- 485/422 support in hardware. The support is:

Full Duplex Mode

In this mode, TxD & RxD are active all the time. This mode is typically used in point to point situations much like RS-232. Please refer to Appendix D: RS-485/422 Line Interface for the jumper settings associated with this function.

Half Duplex Mode

In this mode the TxD line driver is enabled only when data is transmitted and RxD is disabled when data is being transmitted. This mode is typically used in either point to point "2 wire" connections OR in multi-drop "2 wire" bussed connections. Please refer to Appendix D: RS-485/422 Line Interface for the jumper settings associated with this function.

Multi-drop Slave Mode

In this mode the TxD line driver is enabled only when data is transmitted and RxD is enabled all the time. This mode is typically used in multi-drop "4 wire" connections. Please refer to Appendix D: RS-485/422 Line Interface for the jumper settings associated with this function.

Line Termination

You can terminate and bias TxD ±, RxD ±, RTS ±, and CTS ± on the individual RS-485/422 ports through jumper selectable 150

fixed resistors. Please refer to Appendix D: RS-485/422 Line Interface for the jumper settings associated with this function.

Titan/cPCI User’s Manual, ver. 0.00

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Contents Connect Tech Inc Multi-port Serial Communications AdaptersThis page is intentionally blank Limited Warranty Copyright Notice Trademark AcknowledgmentTable of Contents List of Figures List of TablesAppendices Introduction Manual OverviewConventions & Symbols Product Overview FeaturesTitan/cPCI Adapters Titan/cPCI adapters Customer Service Overview Titan/cPCI SoftwareProblem Description Connect Tech Product Description System DescriptionEmail/Internet Mail/CourierTelephone/Facsimile RMA Overview Configuration Hardware InstallationBaud Rate Selection Full Duplex Mode Half Duplex ModeMulti-drop Slave Mode RS-485/422 Line InterfaceInstalling the Titan/cPCI Adapter in your System This page is intentionally blank Software Installation This page is intentionally blank Appendix a Specifications Connectors/Interface DimensionsTitan/cPCI Part Numbers Titan/cPCI-2 Titan/cPCI-4 CertificationGeneral This page is intentionally blank Appendix B Connectors/Pinouts Connector PinoutsDB-37 cable connector pinouts Appendix C Factory Settings Function Factory SettingThis page is intentionally blank Appendix D RS-485/422 Line Interface Electrical Interface SelectionHalf Duplex RS-485 RS-485/422 partial schematic Technical Notes RS-485/422 Cable Wiring RS-485/422 wiring diagram 4 wireRS-485/422 wiring diagram 2 wire Titan/cPCI User’s Manual, ver Titan/cPCI User’s Manual, ver

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