Quatech DSC-200/300 user manual General Information

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1 General Information

The Quatech, Inc. DSC-200/300 provides two RS-422 or RS-485 asynchronous serial communication interfaces for IBM-compatible personal computer systems using the PCI expansion bus. The DSC-200/300 uses Quatech's new Enhanced Serial Adapter design. Legacy serial port data rates are limited to a maximum of 115,200 bits per second. Quatech Enhanced Serial Adapters can achieve data rates as high as 921,600 bits per second.

As a PCI device, the DSC-200/300 requires no hardware configuration. The card is automatically configured by the computer's BIOS or operating system. The two serial ports share a single interrupt line and are addressed in a contiguous block of 16 bytes. A special interrupt status register is provided to help software to manage the shared interrupt.

The DSC-200/300's serial ports are using 16750 Universal Asynchronous Receiver/Transmitters (UARTs). These UARTs contain hardware buffers (FIFOs) which reduce processing overhead and allow higher data rates to be achieved. The 16750 contains a 64-byte FIFO and can transmit and receive data at a rate of up to 921,600 bits per second. The 16750 is recommended for heavy multitasking environments and for applications involving high data rates.

The DSC-200/300 is supported under several popular operating systems and environments. Contact the sales department for details on current software offerings. Most device drivers are available for download from the Quatech world wide web site at http://www.quatech.com.

Quatech DSC-200/300 User's Manual

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Contents DSC-200/300 Warranty Information Page Declaration of Conformity Manufacturers Name Base Address and Interrupt Level IRQ RS-422 or RS-485 Signal Line TerminationUsing the New Hardware Found Wizard Address Map and Special RegistersPage General Information IND Option --- Surge Suppression Upgrade FeaturesFactory default signal termination settings Hardware ConfigurationFull-duplex/Half-duplex Operation Signal ConnectionsClock Rate and Optional Registers Enable Scratchpad Register SPAD, J13Clock multiplier jumper options Force High-Speed Uart Clock X2, X4, or X8, J10-J12Jumper/connector locations Hardware InstallationChannel Address Range Interrupt Status Register Enabling the Special RegistersBit Name Description Options RegisterRR1 RR0 Clock Rate MultiplierWindows Millennium Windows ConfigurationWindows Windows Windows Page Using the New Hardware Found Wizard Windows NT QTPCI.EXE DOS and Other Operating SystemsQTPCI.EXE Basic Mode display QTPCI.EXE Expert Mode display OS/2 Jumper/Channel correspondence External ConnectionsRclk RTS/CTS HandshakeAUXIN/AUXOUT Loopback XclkHalf-Duplex/Full-Duplex Selection Half- or full-duplex selection RS-422/485 Line termination resistance values Termination ResistorsRS-422/485 Peripheral Connection DSC-200/300 connector definitionsINTA# PCI Resource Map10Specifications Computer will not boot up TroubleshootingDSC-200/300 Revision March