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Quatech DS-200 User manual

Manual is about: Two Channel RS-422/485 Asynchronous Enhanced Serial Adapter

Summary of DS-200

  • Page 1

    Ds-200/300 two channel rs-422/485 asynchronous enhanced serial adapter for isa compatible machines user's manual quatech, inc. Tel: (330) 434-3154 662 wolf ledges parkway fax: (330) 434-1409 akron, ohio 44311 bbs: (330) 434-2481 http://www.Quatech.Com interface cards for ibm pc/at and ps/2.

  • Page 3: Warranty Information

    Warranty information quatech inc. Warrants the ds-200/300 to be free of defects for one (1) year from the date of purchase. Quatech inc. Will repair or replace any adapter that fails to perform under normal operating conditions and in accordance with the procedures outlined in this document during t...

  • Page 4

    © 1998, quatech, inc. Notice the information contained in this document cannot be reproduced in any form without the written consent of quatech, inc. Likewise, any software programs that might accompany this document can be used only in accordance with any license agreement(s) between the purchaser ...

  • Page 5

    (this page intentionally left blank) ds-200/300 user's manual iii.

  • Page 6: Table of Contents

    Table of contents 9-1 9. Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1 8. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-6 7.8 rs-422/485 peripheral connection . . . . . . . . . . . . . . . ...

  • Page 7: 1.  General Information

    1. General information the quatech, inc. Ds-200/300 provides two rs-422/rs-485 asynchronous serial communication interfaces for ibm-compatible personal computer systems using the 16-bit isa (industry standard architecture) expansion bus. The ds-200/300's serial ports are implemented using 16550 or 1...

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  • Page 9: 2.  Installation

    2. Installation if the default address and interrupt settings are sufficient, the ds-200/300 can be quickly installed and put to use. The factory defaults are listed in figure 1. Yes 3 2f8 hex serial 1 yes 4 3f8 hex serial 0 enabled irq address port figure 1 --- default address and irq settings for ...

  • Page 10

    Figure 2 --- photo of ds-200/300 3-2 quatech inc..

  • Page 11

    3. Windows 95 configuration windows 95 maintains a registry of all known hardware installed in your computer. Inside this hardware registry windows 95 keeps track of all of your system resources, such as i/o locations, irq levels, and dma channels. The "add new hardware wizard" utility in windows 95...

  • Page 12

    4. A hardware types list box should appear. Find the “multi-function adapters” type on the list and click it. Click the “next” button to continue. 5. A list box opens with manufacturers on the left and the associated board models on the right. Click the “have disk” button. 6. An install from disk di...

  • Page 13: Manager

    Note : you may be able to skip step 9 if you are certain that your system has the latest version of these files installed. If you do not have your windows 95 install disks immediately available, click “ok” anyway. A dialog box appears with an option to skip the files. Click the skip button and the f...

  • Page 14

    3. Double click the device group “multi-function adapters”. The ds-200/300 enhanced serial adapter model name should appear in the list of multi-function adapters. Figure 3--- windows 95 device manager 4. Double click the ds-200/300 enhanced serial adapter model name and a properties box should open...

  • Page 15

    On the up/down arrows to the right of the resource value. This scrolls you through all of the allowable resources for your hardware. Pay attention to the conflict information at the bottom of the window. Do not select a resource that causes a conflict with any other installed hardware. Click “ok” to...

  • Page 16

    Logical com port name is assigned to your ports by windows 95. This name is required by a windows 95 application when accessing a particular port. 4-6 quatech inc..

  • Page 17: 4.  Addressing Ports

    4. Addressing ports 4.1 setting the address the base address of each port of the ds-200/300 is set using two dip switch packs. When setting the address selection switches, a switch in the "on" position specifies that the corresponding address line must be a logic 0 for the port to be selected. Simil...

  • Page 18

    Two, and one, hence the maximum value of 8+4+2+1 = 15. A serial port's address is a 16-bit quantity that is most often expressed in four hexadecimal (base 16) digits. A hex digit can hold a value from 0 to 15 (decimal), and is made up of four binary bits given weights of eight, four, a possible seri...

  • Page 19

    Switch on bit = 0 switch off bit = 1 serial 0 uses sw1 and sw2 serial 1 uses sw3 and sw4 on 1 2 3 4 5 6 7 8 8 8 2 1 f 4 8 1 2 3 4 5 6 on 0 2 1 3 0 0 0 0 0 0 sw1 sw2 enable/disable on 1 2 3 4 5 6 7 8 8 8 2 1 f 4 8 1 2 3 4 5 6 on 0 2 0 2 0 0 0 0 0 0 sw3 sw4 factory default setting for serial 2 --- 02f...

  • Page 20

    The standard addresses for serial ports com1 and com2 are listed in figure 7. Recommended addresses for serial ports com3 and com4 are also listed. The switch settings for these addresses are shown in figure 6. 02e8 hex com4 recommendations only. No official standards exist for com3 and com4. 03e8 h...

  • Page 21: 5.  Data Rate Multiplier

    5. Data rate multiplier a standard rs-422/485 serial port operates at a clock speed of 1.8432 mhz. In order to achieve higher data rates, the ds-200/300 enhanced serial adapter can operate at two times, four times (16750 uart only), or even eight times (16750 uart only) this standard clock speed. Th...

  • Page 22

    Can identify a ds-200/300 board by recognizing the pattern read back from the id bits (seefigure 10). Rate register bit 0 rr0 0 rate register bit 1 rr1 1 not used or2 2 not used or3 3 not used or4 4 not used or5 5 id register bit 0 id0 6 id register bit 1 id1 7 description name bit figure 9--- optio...

  • Page 23

    At power on and reset, the rate register is initialized at 00. This means that the ds-200/300 will power up in the x1 mode as long as the sw jumper is installed. The ds-200/300 ships from the factory with the sw jumper installed. Ds-200/300 user's manual 5-3.

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  • Page 25: 6.  Interrupt Level (Irq)

    6. Interrupt level (irq) the ds-200/300 allows the use of any interrupt level in the range irq2 to irq7, irq10 to irq12, irq14, or irq15, selected using jumper block j3 (for serial 0) or j4 (for serial 1). In figure 12, the factory default settings for serial 0 and serial 1 are shown. To select a di...

  • Page 26: 6.1 Interrupt Sharing

    6.1 interrupt sharing both ports on the ds-200/300 can share the same interrupt level or they can share their interrupt with another quatech adapter supporting sharable interrupts. Jumper j2 can be used to connect the uart generated interrupt directly to the selected irq or to enable the interrupt s...

  • Page 27

    6.2 interrupt status register the ds-200/300 is equipped with an interrupt status register (isr) which can be used to simplify the servicing of shared interrupts. This register is located at [base address+7] along with the options register. Like the or, the sp jumper must be removed to access the is...

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  • Page 29: 7.  Output Configuration

    7. Output configuration the ds-200/300 provides four differential communication signals per channel. The two output signals are transmit data (txd) and auxiliary output (auxout). The two input signals are receive data (rxd) and auxiliary input (auxin). A ground signal is also provided. The ds-200/30...

  • Page 30: 7.1 Rts/cts Handshake

    7.1 rts/cts handshake transmission of rts, combined with reception of cts, allows for hardware handshaking (data flow control) between the uart and the external device. Rts is transmitted on auxout by connecting pins 4 and 5 of the jumper pack. Cts is received on auxin by connecting pins 1 and 2 of ...

  • Page 31: 7.3 Xclk

    7.3 xclk this is the output clock signal used by the transmitter portion of the uart. It is generally connected to the uart's own receive clock input (rclk). This is done by connecting pins 3 and 6 of the jumper pack. If desired, xclk can be transmitted to an external source over the auxout line by ...

  • Page 32

    7.5 half duplex/full duplex selection using jumper packs j6 and j8, the channels can be configured to operate in half duplex mode. This causes the transmitters to be controlled by either the data terminal ready (dtr) or the request to send (rts) output from the uart. In half duplex mode, if the uart...

  • Page 33

    1 3 2 5 4 6 xclk rts cts rclk dtr dsr dcd ri auxout rs-422 or rs-485 driver + - auxin rs-422 or rs-485 receiver + - 1 3 2 5 4 6 -1 txen rxen figure 22 --- output control block diagram 7.6 factory default configuration of ds-200/300 the ds-200/300 is shipped from the factory with each channel configu...

  • Page 34: 7.7 Termination Resistors

    7.7 termination resistors optional line termination resistors are provided for the input signals of each of the ds-200/300’s rs-422/485 ports. The user has the option of selecting rs-422 termination ( 100Ω ), rs-485 termination (120 Ω ), or no termination. Line termination may be selected or removed...

  • Page 35

    Auxiliary channel input (negative) auxin- 9 serial data input (negative) rxd- 8 serial data output (negative) txd- 7 auxiliary channel output (negative) auxout- 6 auxiliary channel input (positive) auxin+ 5 serial data input (positive) rxd+ 4 chassis ground gnd 3 serial data output (positive) txd+ 2...

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  • Page 37: 8.  Specifications

    8. Specifications baud rates: 921.6 kbps with 16750 uarts 230.4 kbps with 16550 uarts uarts: two 16550 uarts with 16-byte fifos or two 16750 uarts with 64 byte fifos transceivers: max491 or compatible driver rise or fall time: 5 ns minimum 15 ns typical 25 ns maximum maximum data rate: 2.5 mbps base...

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  • Page 39: 9.  Troubleshooting

    9. Troubleshooting listed here are some common problems and frequent causes of those problems. Suggestions for corrective action are given. If the information here does not provide a solution, contact quatech customer service for technical support. Any unauthorized repairs or modifications will void...

  • Page 41

    Ds-200/300 user's manual revision 3.10 may 1999 p/n: 940-0049-310