Quatech RS-485 user manual OS/2, DOS and other operating systems

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6 Other Operating Systems

Device drivers for Windows NT and OS/2 are also available for the DSC-200/300. The board can be used under DOS and other operating systems as well in many circumstances. The software described below can be obtained from the Quatech web site if it did not come with the board.

6.1 OS/2

The OS/2 device driver supports up to 32 serial ports in a system. Installation is a manual, but simple, process. Please refer to the documentation included with the device driver for full installation and configuration details.

6.2 DOS and other operating systems

The DSC-200/300 is not a direct drop-in replacement for a legacy serial port because its base address and IRQ cannot be fixed at values such as 3F8 hex, IRQ 4 (COM1) or 2F8 hex, IRQ 3 (COM2), etc. Rather, the system BIOS assigns the address and the IRQ in a plug-and-play fashion at boot time. Software which is to use the DSC-200/300 must be able to accommodate any valid assignments of these resources.

For Windows 95, Windows NT and OS/2, the Quatech device drivers determine what the resource assignments are and proceed accordingly. In other cases, however, the user must intervene. The discussion below will center on DOS, but the concepts can be applied to other operating systems as well.

Many DOS applications support user configuration of the base address and IRQ of a serial port. Such applications can generally make use of the DSC-200/300. Older applications, as well as some custom software, may use hard-coded standard legacy serial port addresses. These applications will require modifications to support PCI devices.

Custom applications for which the customer has source code can be modified to make just a few PCI BIOS function calls to obtain all the necessary configuration information. The PCI BIOS specification can be obtained from the PCI Special Interest Group. Contact Quatech technical support for more information.

Quatech DSC-200/300 User's Manual

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Contents DSC-200/300 Date of Purchase Model Number Page Declaration of Conformity IND Option --- Surge Suppression Upgrade Changing Resource Settings with Device Manager2 AUX0SEL1,0, AUX1SEL1,0 J12,11,19,18 4 TGL0SEL1,0, TGL1SEL1,0 J15,14,22,21External Connections Half-Duplex/Full-Duplex/Auto-Toggle SelectionGeneral Information Features DSC-200/300 Product Series SummarySignal Connections Full-duplex/Half-duplex OperationJumpers J10-J23 define the options for this card RXEN0SEL, RXEN1SEL J16 1 CTS0SEL, CTS1SEL J10,17RCLK0SEL, RCLK1SEL J13 Enable Scratchpad Register SPAD, J2 Clock Rate and Optional RegistersClock multiplier jumper options Hardware Installation Base Address and Interrupt Level IRQ Enabling the Special Registers Interrupt Status RegisterQuatech Modem Control Register Quatech Modem Control RegisterOptions Register Bit Name DescriptionClock Rate Multiplier RR1 RR0Windows Millennium Windows Windows Windows Windows NT Viewing Resources with Device Manager Quatech DSC-200/300 PCI Two-Port RS-422/RS485 Serial Adapter Adapter Data Rate Multiplier Application. This mode is useful for legacy Used when external handshaking or Page OS/2 DOS and other operating systemsQTPCI.EXE QTPCI.EXE Expert Mode display RTS/CTS Handshake Jumpers J10-12Rclk TclkAUXIN/AUXOUT Loopback AUXIN/AUXOUT loopbackHalf/full-duplex and Auto-Toggle selection Termination Resistors RS-422/485 TerminationDSC-200/300 connector definitions RS-422/485 Peripheral ConnectionPCI Resource Map Specifications Computer will not boot up
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