DSU-200/300-SIT Single Channel RS-232 with Single Channel RS-422/485 USB adapter Users Manual TWO PORT SERIAL USB ADAPTER FOR PERSONAL COMPUTERS QUATECH, INC. 662 Wolf Ledges Parkway Akron, Ohio 44311 TEL: (330) 434-3154 FAX: (330) 434-1409 http://www.quatech.
-1 Generic Inc.
Warranty Information Quatech Inc. warrants the DSU-200/300-SIT to be free of defects for five (5) years from the date of purchase. Quatech Inc. will repair or replace any system component that fails to perform under normal operating conditions in accordance with the procedures outlined in this document, provided the failure occurs during the one year warranty period. Any damage resulting from improper installation, operation or general misuse voids all warranty rights.
Notice The information contained in this document cannot be reproduced in any form without the written consent of Quatech Inc. Any software programs accompanying this document can be used only in accordance with any licensing agreement(s) between the purchaser and Quatech Inc. Quatech Inc. reserves the right to change this documentation or the product to which it refers at any time and without notice. The authors have taken due care in the preparation of this document and any associated software program(s).
Table of Contents 1. Introduction 7 7 1.1 System Requirements 2. Hardware Installation 8 8 11 2.1 Plug-and-Play Installation 2.2 Viewing Properties with the Device Manager 3. Input/Output Connections 14 14 15 16 17 3.1 D-9 Connectors 3.2 RS-232 Port - Port 2 3.3 RS-422/485 Port - Port 1 3.3.1 Termination Resistors 4. Advanced Options 18 19 19 19 20 20 20 20 20 20 21 21 21 21 21 4.1 Data Rate Multiplier 4.1.1 4.1.2 4.1.3 4.1.4 Auto (default) Force X1 mode Force X2 mode Force X4 mode 4.
List of Figures and Tables Figure 2-1. Figure 2-2. Figure 2-3. Figure 2-4. Figure 2-5. Figure 2-6. Figure 3-1. Figure 3-2. Figure 3-3. Figure 3-4. Figure 4-1. Table 3-1. Table 3-2.
1. Introduction Quatech’s DSU-200/300-SIT provides one independent RS-232 serial interface and one independent RS-422/485 serial interface to the host PC via the Universal Serial Bus (USB) port. Each adapter comes standard with 16550 Universal Asynchronous Receiver/Transmitters (UARTs) containing 16 byte First In First Out (FIFO) storage devices. These FIFOs, in conjunction with the USB micro controller FIFOs, help to relieve the CPU of excessive interrupts by buffering received and transmitted data.
2. Hardware Installation 2.1 Plug-and-Play Installation The following procedures are step-by-step instructions for installing the Quatech USB adapter under Windows 98? . 1. Turn on the computer and boot up the Windows 98 operating system. 2. Plug the wide flat end of the USB cable into the downstream connector located on the back of the computer or USB hub. Plug the square end of the USB cable into back of the DSU-200/300-SIT USB box. 3.
4. Insert the disk provided with your hardware into the system’s floppy drive and press the ‘Next’ button to proceed to the dialog window shown in Figure 2-2. Figure 2-2. Add New Hardware Dialog Window #2 5. Select the recommended option: ‘Search for the best driver for your device’ and then press the ‘Next’ button to proceed to the dialog window shown in Figure 2-3.
Figure 2-3. Add New Hardware Dialog Window #3 6. Select the ‘Floppy Disk Drives’ check box and click the ‘Next’ button to proceed to the dialog window shown in Figure 2-4. Figure 2-4.
7. When the dialog window shown in Figure 2-4 appears, click the ‘Next’ button to view the final dialog window and then click ‘Finish’ to complete the installation of your USB adapter. 8. Once the adapter configuration is finished, Windows 98 will then configure the individual serial ports (e.g. COM3, COM4) which completes the hardware installation process. 2.
Figure 2-5. Quatech USB Serial Port Properties Box 2. Click on the model name port settings tab to view the property box shown in Figure 2-6.
Figure 2-6. Quatech USB Serial Port Settings Window 3. The Port Settings window can be used to create default settings for the selected serial port, however most communication applications implement their own method for choosing serial port settings. Clicking the “Restore Defaults” button resets all property fields to their original default value. Clicking the "Advanced..." button opens the Advanced Options dialog window. For a detailed description of advanced options , refer to Section 4.
3. Input/Output Connections 3.1 D-9 Connectors The DSU-200/300-SIT comes with a standard male D-9 connector on port 2. Refer to Figure 3-1 for pin numbers. 5 9 8 7 6 4 3 2 1 Figure 3-1. DSU-200/300-SIT Male D-9 Connector (port 2) The DSU-200/300-SIT comes with a standard female D-9 connector on port 1. Refer to Figure 3-2 for pin numbers. 1 5 2 3 4 5 4 3 2 1 9 8 7 6 6 7 8 9 Figure 3-2. DSU-200/300-SIT Female D-9 Connector (port 1) 3-1 Generic Inc.
3.2 RS-232 PORT - PORT 2 RS-232 devices are classified by their function as either Data Terminal Equipment (DTE) or Data Communication Equipment (DCE). Generally DTE is defined as the communication source and DCE is defined as the device that provides a communication channel between two DTE type devices. (See Figure 3-3). PC Modem RS-232 DTE PC RS-232 DTE DCE Modem Telephone line DCE Figure 3-3.
3.3 RS-422/485 PORT - PORT 1 The DSU-200/300-SIT port 1 provides four differential communication signals (either RS-422 or RS-485) per channel. Transmit Data (TxD) and Auxiliary Output (AUXOUT) are the two output signals. Receive Data (RxD) and Auxiliary Input (AUXIN) are the two input signals. A ground signal is also provided. The AUXOUT pair can carry the UART’s RTS signal. The AUXIN pair can carry the UART’s CTS signal.
3.3.1 Termination Resistors Factory installed resistors allow for DSU-200/300-SIT signal line termination in compliance with RS-422 and RS-485 standards. The desired termination can be selected or removed by configuring the associated jumper for the port. Figure 3-4 shows the factory default configuration: ‘no termination’. J3 2 1 J2 4 3 2 1 4 3 CN1 Factory Default = pins 3 & 4 (no termination) Figure 3-4.
4. Advanced Options Advanced setting selection is accomplished using the Advanced Options dialog window from the Windows 98 Device Manager. To view the Advanced Options dialog window, double click the device group “Ports (COM & LPT)”. Double click on the desired serial port and then select the model name port settings tab. Note 1: Changing any setting in the advanced options window will affect both ports on the DSU-200/300-SIT USB adapter.
For the DSU-200/300-SIT adapter, clicking the Advanced Options button will open the property window shown in Figure 4-2. Figure 4-1. DSU-200/300-SIT Advanced Options Dialog Window 4.1 Data Rate Multiplier The DSU-200/300-SIT uses an accelerated UART clock frequency to boost data rates to as high as 460,800 bits per second. This setting determines the amount of data rate acceleration applied.
4.1.3 Force X2 mode Select this radio button to allow each serial port to run at a maximum of 230,400 bits per second. The software application can request any desired baud rate up to 115,200 bits per second. The actual baud rate will be two (2) times higher than requested. This setting allows applications not capable of asking for higher baud rates to achieve them. 4.1.4 Force X4 mode Select this radio button to allow each serial port to run at a maximum of 460,800 bits per second.
4.1.1 Full Duplex (default) Selecting this radio button allows simultaneous transmit and receive operation. Transmit and receive data must move over separate dedicated pairs of conductors in the attached cable. Each UART's transmit drivers are always active in this mode. 4.1.2 Half Duplex using RTS Selecting this radio button allows communication in only one direction at a time. Transmit and receive data can share a single pair of conductors in the attached cable.
5. Troubleshooting Listed here are some common installation problems and their causes. If the information here does not provide a solution, contact Quatech’s Technical Support department at 1-800-553-1170 or (330) 434-3154. Note: Any unauthorized repairs or modifications will void the USB adapter's warranty. Computer will not boot Is the adapter properly connected? Remove the USB cable from both the DSU-200/300-SIT adapter and the PC or USB hub connector.
6. Specifications Bus Interface USB Specification 1.1 Data Rates 460.8 kbps max with X4 setting 230.4 kbps max with X2 setting 115.2 kbps max with X1 setting Ports 1 RS-232 1 RS-422/485 UARTs 2 16550 UARTs with 16-byte FIFOs Transceivers: (SP211HB) RS-232 (port 2) RS-232 Output Voltage Swing: +5V min, +7V typical RS-232 Input Voltage Range: -15V min, +15V max Input Threshold Low: 0.8V min, 1.2V typical Input Threshold High: 2.4V max, 1.
DSU-200/300-SIT Users Manual
DSU-200/300-SIT Users Manual Version 1.01 March 26, 2002 Part No.
