Quatech DS-102 User Manual

DS-102Dual Channel RS-232 AsynchronousCommunications Adapterfor ISA compatible machinesUser's ManualQUATECH, INC. TEL: (330) 434-3154662 Wolf Led

III. ENABLING AND ADDRESSING PORTSSetting the addressEach serial port on the DS-102 uses 8 consecutive I/O locations inthe range of 0000 hex to 07FF h

Switch on bit = 0Switch off bit = 1Serial 1 uses SW1Serial 2 uses SW2Factory default setting for Serial 1 --- 03F8 hex (COM1)ON1 2 3 4 5 6 7 88 2 1

The standard addresses for serial ports COM1 and COM2 are listedin Figure 5. Recommended addresses for serial ports COM3 and COM4are also listed.

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IV. SETTING INTERRUPT LEVELS (IRQS)The DS-102 interrupt circuitry allows each port to use any interruptlevel in the range IRQ2 through IRQ7. The inte

Interrupt SharingAn interrupt sharing circuit allows a port on the DS-102 to share aninterrupt with the other port on the board or with another Quate

V. EXTERNAL CONNECTIONSRS-232-C devices are classified by their function as either DataTerminal Equipment (DTE) or Data Communication Equipment (DCE)

To simplify connections to other devices, each port on the DS-102 isequipped with a jumper block that allows the port to be configured aseither a DTE-

The DS-102 connects to peripheral equipment through male D-9connectors. Adapters are available to convert these connectors intostandard D-25 male con

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VI. SERIAL PORT FUNCTIONALDESCRIPTIONThis section contains information intended for advanced usersplanning to do custom programming with the DS-102.

Accessing the Serial Port registersFigure 15 lists the address map for the 16450 and 16550 UARTs.Each register can be accessed by reading from or wri

INTERRUPT ENABLE REGISTERThis register is located at I/O address [base+1]. It enables the fivetypes of UART interrupts. Interrupts can be totally d

IP --- Interrupt pending:When logic 0, indicates that an interrupt is pending and the contents of theinterrupt identification register may be used to

FIFO CONTROL REGISTER (16550 only)This register, which applies only to the 16550 UART, is awrite-only register located at I/O address [base+2]. It

LINE CONTROL REGISTERThis register is located at I/O address [base+3]. It is used forspecifying the format of the asynchronous serial data to be pro

MODEM CONTROL REGISTERThis register is located at I/O address [base+4], and is used tocontrol the interface with the modem or device used in place of

LINE STATUS REGISTERThis register is located at I/O address [base+5]. It is used toprovide various types of status information concerning the data t

MODEM STATUS REGISTERThis register is located at I/O address [base+6]. It reports on thestatus of signals coming from the modem or equipment used in

FIFO INTERRUPT MODE OPERATION (16550 UART only)When the receiver FIFO and receiver interrupts are enabled:1. The receive data interrupt is issued when

28VIII. TROUBLESHOOTING27VII. SPECIFICATIONS25BAUD RATE SELECTION24FIFO polled mode operation (16550 UART only)23FIFO INTERRUPT MODE OPERATION (1655

FIFO polled mode operation (16550 UART only)The receiver and transmitter are operated independently, whichwould allow either or both to be used in a p

BAUD RATE SELECTIONThe 16450 or 16550 UART determines the baud rate of the serialoutput using a combination of the clock input frequency and the value

2.86256000-338400-619200-129600-167200-244800-323600-4824000.69582000-641800-961200-192600-384300-7681500.0261047110-153675-230450ERROR BETWEEN DESIRE

VII. SPECIFICATIONSBus interface: Industry Standard Architecture (ISA)8-bit busSerial portsController: 16450 (16550 optional)Interface: Two male D-9

VIII. TROUBLESHOOTINGListed here are some common problems and frequent causes ofthose problems. Suggestions for corrective action are given. If the

DS-102 Dual Channel RS-232 Asynchronous Communications AdapterUser's ManualRevision 3.00 August 13, 1993

WARRANTY INFORMATIONQuatech, Inc. warrants the DS-102 to be free of defects for one (1) year from the date of purchase. Quatech, Inc. will r

© 1993, Quatech, Inc.NOTICEThe information contained in this document cannot be reproducedin any form without the written consent of Quatech, Inc. L

I. GENERAL INFORMATIONThe Quatech, Inc. DS-102 provides two RS-232 asynchronous serialcommunication interfaces for IBM-compatible personal computer s

II. INSTALLATIONIf the default address and interrupt settings are sufficient, theDS-102 can be quickly installed and put to use. The factory defaults

IRQ2IRQ3IRQ4IRQ5IRQ6IRQ7Set IRQ levels here(Diagram not to scale)16450/1655016450/16550SW1Serial 1SW2Serial 2 J4Set addresses here(SW1, SW2)(J5, J6)J7