DSC-200/300 Two Channel RS-422/485 Asynchronous Communications Adapter for PCI bus User's Manual QUATECH, INC. 5675 Hudson Industrial Parkway Hudson, Ohio 44236 TEL: (330) 655-9000 FAX: (330) 655-9010 http://www.quatech.
WARRANTY INFORMATION Quatech, Inc. warrants the DSC-200/300 to be free of defects for five (5) years from the date of purchase. Quatech, Inc. will repair or replace any board that fails to perform under normal operating conditions and in accordance with the procedures outlined in this document during the warranty period. Any damage that results from improper installation, operation, or general misuse voids all warranty rights. Please complete the following information and retain for your records.
1998 - 2006, 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 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.
Declaration of Conformity Manufacturer's Name: Quatech Inc.
...................................................................... 1 1 General Information .......................................... 5 1.1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.1.1 "IND" Option --- Surge Suppression Upgrade . . . . . . . . . . . . . . . . . 6 2 Hardware Configuration ..................................... 7 2.1 Signal Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.2 DOS and other operating systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 6.2.1 QTPCI.EXE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 7 External Connections ........................................ 7.1 RTS/cts Handshake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.2 RCLK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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.
1.1 Features The standard DSC-200/300 implements each of its communication channels with a 16550 UART and uses standard line driver and receiver components. For improved performance and industrial-grade reliability, Quatech offers the following board upgrades: 1.1.1 "IND" Option --- Surge Suppression Upgrade The "IND" option provides the protection essential for reliable use in an industrial environment.
2 Hardware Configuration The DSC-200/300 is automatically configured at boot time by the computer's BIOS or operating system. There are no required switches or jumpers to set for installation. This chapter lists a number of optional jumper settings that control various hardware features. These jumpers, located in a column at the end of the board opposite the D-type connectors, control how signals are routed from the UARTs to the connector, as well as full- or half- duplex operation and special options.
Jumpers J10-J23 define the options for this card: J2 SPAD J3 X8 J4 X4 J5 X2 J10 CTS0_SEL J11 AUX0_SEL0 J12 AUX0_SEL1 J13 RCLK0_SEL J14 TGL0_SEL0 J15 TGL0_SEL1 J16 RXEN0_SEL J17 CTS1_SEL J18 AUX1_SEL0 J19 AUX1_SEL1 J20 RCLK1_SEL J21 TGL1_SEL0 J22 TGL1_SEL1 J23 RXEN1_SEL Figure 2 - Right Card Edge Jumpers Quatech DSC-200/300 User's Manual 8
2.2.1 CTS0_SEL, CTS1_SEL (J10,17) With NO jumpers on J10 or J17 the mode selection is CTS=AUXIN. With Jumpers installed the mode selection is CTS=RTS. 2.2.2 AUX0_SEL1,0, AUX1_SEL1,0 (J12,11,19,18) With NO jumpers on J12 or J19 the mode selection is AUXOUT=RTS. With Jumpers installed on J12 or J19 and NO jumpers installed on J11 or J18, the mode selection is AUXOUT=TCLK. With Jumpers installed on J12, J11 or J19, J18, the mode selection is AUXOUT=AUXIN. 2.2.
2.3 Clock Rate and Optional Registers Figure 3 shows the jumper configuration as shipped from the factory, with two spare jumpers applied in neutral positions. Remove one or both and apply as shown in following subsections to set optional features. J2 SPAD J3 X8 J4 X4 J5 X2 Figure 3 --- Factory default clock rate and options settings 2.3.
The factory default is none of these jumpers applied, which allows for software control of the clock multiplier via the Options Register. The Options Register powerup default is for a standard times-1 clock of 1.8432 MHz for compatibility with standard serial ports.
3 Hardware Installation 1. Turn off the power of the computer system in which the DSC-200/300 is to be installed. 2. Remove the system cover according to the instructions provided by the computer manufacturer. 3. Make any desired optional jumper setting changes. 4. Install the DSC-200/300 in any empty PCI expansion slot. The board should be secured by installing the Option Retaining Bracket (ORB) screw. 5. Replace the system cover according to the instructions provided by the computer manufacturer. 6.
4 Address Map and Special Registers This chapter explains how the two UARTs and special registers are addressed, as well as the layout of those registers. This material will be of interest to programmers writing driver software for the DSC-200/300. 4.1 Base Address and Interrupt Level (IRQ) The base address and IRQ used by the DSC-200/300 are determined by the BIOS or operating system. Each serial port uses 8 consecutive I/O locations.
4.2 Enabling the Special Registers The DSC-200/300 contains two unique registers, an Interrupt Status Register and an Options Register. These registers are enabled when the SPAD jumper is removed (factory default). They replace the UART Scratchpad Register on accesses to register address 7. The Interrupt Status Register and Options Register are accessed through the scratchpad location of either UART. The DLAB bit of the UART (Line Control Register, bit 7) is used to select between the two registers.
4.4 Quatech Modem Control Register The Quatech Modem Control Register can be used to setup each port. To access the QMCR write a 0xBF to the LCR(base + 3) and a 0x10 to the Options Register (base+7). This will allow the user read/write access to the QMCR. The QMCR of the entire DSC-200/300 is shown in Figure 9a.
4.5 Options Register The Options Register allows software to identify the DSC-200/300 as a Quatech Enhanced Serial Adapter. It also allows software to set the UART clock rate multiplier. Figure 10 shows the structure of the Options Register. The powerup default of the Options Register is all bits zero.
4.5.2 Clock Rate Multiplier A standard serial port operates at a clock speed of 1.8432 MHz. In order to achieve higher data rates, Quatech Enhanced Serial Adapters can operate at two times, four times, or even eight times this standard clock speed. This is controlled by the clock rate multiplier bits in the Options Register. Software can determine the UART clock frequency by reading the clock rate multiplier bits RR1 and RR0 in the Options Register as shown in Figure 12.
5 Windows Configuration 5.1 Windows Millennium 1. After inserting the DSC-200/300 for the first time the "Add New Hardware Wizard" will begin. Select "Search for the best driver for your device.". Check the "Removable media" and "Specify location" box. Click the "Next" button. 2. Window will locate the proper INF file and copy the file from the CD. Click the "Next" button. The final dialog screen will verify the file copy from the CD. Click the "Finish" button. 3.
5.2 Windows 2000 1. After inserting a DSC-200/300 for the first time, the "Add New Hardware Wizard will appear at start up. Click the "OK" button. 2. The following dialog box insert the Communications Driver CD (shipped with the device). Click the "OK" button. 3. The following dialog box will display the appropriate INF file on the CD in drive. Click the "OK" button. 4. Window will copy the INF file from the diskette and display a final dialog indication that the process is complete.
5.3 Windows 98 1. After inserting a DSC-200/300 for the first time, the "Add New Hardware Wizard will appear at start up. Click the "Next" button. 2. Select "Search for the best driver for you device". Click the "Next" button. 3. On the next dialog, select the "CD - ROM drive" check box. Insert the Communication Drivers CD (shipped with the device) into the CD - ROM drive. Click the "Next" button.
4. The following dialog box will display the appropriate INF file on the diskette in drive. Click the "Next" button. 5. Window will copy the INF file from the diskette and display a final dialog indication that the process is complete. Click the "Finish" button. 5.4 Windows 1995 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.
2. Select the radio button for "Driver from disk provided by hardware manufacturer." Click the "OK" button to continue. 3. An "Install From Disk" dialog box should pop up. Insert the diskette with the Quatech INF files on it, select the correct drive letter, and click the "OK" button. Windows 95 automatically browses the root directory for an INF file that defines configurations for Multi-function Adapters.
5.6 Viewing Resources with Device Manager This discussion applies equally to Windows 95/98/ME and 2000/XP. Windows maintains a registry of all known hardware installed within the computer. Inside this hardware registry Windows keeps track of all the computer's resources, such as base I/O addresses, IRQ levels, and DMA channels. In the case of a PCI plug-in card, Windows configures the new hardware using free resources it finds within the hardware registry, and updates the registry automatically.
3. Double click the device group "Multi-function Adapters". The DSC-200/300 “parent device” belongs to this hardware class. The full device name for the DSC-200/300 is Quatech DSC-200/300 PCI Two-Port RS-422/RS485 Serial Adapter. 4. Double click the DSC-200/300 name and a properties dialog should open for the hardware adapter. 5. Click the "Resources" tab located along the top of the properties box to view the resources Windows has allocated for Input/Output Range and Interrupt Request.
9. Use the Logical COM Port names to access the serial ports on your DSC-200/300 through your software applications. Note: The Logical COM Port name is assigned to your ports by Windows. This name is required by Windows applications when accessing a particular port. 5.6.1 Changing Resource Settings with Device Manager 1. Start the Windows 95/98/ME Device Manager. 2. Double click on the hardware class Multi-Port Serial Adapters to list hardware devices in the class. 3.
Clock Mode Max bps Auto 921,600 X1 115,200 X2 230,400 X4 460,800 Quatech DSC-200/300 User's Manual Data Rate Multiplier Description Auto clock mode enables applications to request any baud rate up to 921,600. The hardware drivers will select the correct clock multiplier based on the baud rate requested The X1 clock mode mimics a standard COM port. The hardware drivers lock the clock to the standard rate. The port will run at the baud rate requested by the application.
X8 921,600 the application. This mode is useful for legacy applications which cannot request baud rates over 115.200. The X8 clock mode locks the ports hardware clock at eight times the standard rate. The baud rate the port runs at will always be eight times the rate requested by the application. This mode is useful for legacy applications which cannot request baud rates over 115.200. 6. Double click the hardware class Ports (Com and LPT).
Used when external handshaking or clocking signals are not available. RTS routed to AUXOUT, AUXIN routed to CTS, and TCLK routed to Modem Control RCLK. Used when RTS/CTS handshaking is required. RTS routed to CTS, AUXIN routed to RCLK, and TCLK routed to AUXOUT. Used to connect ports transmitting at Clocks different baud rates. In order to function, all ports must have and use this feature. Receive Control Receivers are always enabled.
9. Click the "Port Settings" tab and then click the "Advanced" button. The DSC-200/300 driver will display a custom Advanced Port Settings control, which allows the ports UART compatibility mode and FIFO threshold levels to be configured. The threshold values of full-scale for the transmit buffer and ¾-scale for the receive buffer are optimal for most applications. Note that the FIFO option for each of the DSC-200/300's two ports is configured independently.
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.
6.2.1 QTPCI.EXE Quatech's "QTPCI" utility supplies the information required when modifying the serial port settings of the application. This program should be run from real DOS, not in a Windows DOS box. Figure 13 shows the Basic Mode display for the DSC-200/300 after the "Q" key has been pressed. In this example, the DSC-200/300 uses I/O base address FFA0 hex and IRQ 3. The hardware revision of the DSC-200/300 is also displayed.
Figure 14 shows the Expert Mode display for the DSC-200/300 after the "Q" key has been pressed. The information from the Basic Mode display is presented along with more details such as the Vendor and Device IDs, PCI Class Code, size of memory and I/O regions, etc. Pressing the "N" key will show similar information for all non-Quatech PCI devices in the system, including those devices integrated on the motherboard. In this example, the "Base addr 0" resource is reserved.
7 External Connections The DSC-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 available input signals for AUXIN are Clear To Send (CTS) and the Receive Clock (RCLK). The available output signals for AUXOUT are Request To Send (RTS), the Transmit Clock (TCLK), and the AUXIN signal (for loopback).
7.2 RCLK This is the clock signal used by the receiver portion of the UART. It is generally provided by connecting it to the UART's own transmit clock output (TCLK). This is done by not connecting pins 1 and 2 of the jumper block J13. If desired, RCLK can be received from an external source over the AUXIN line by connecting pins 1 and 2 of the jumper block J13. Figure 17 shows how to select the RCLK mode.
7.4 AUXIN/AUXOUT Loopback The AUXIN signal is an input from the external device, and connecting it to the AUXOUT signal provides for a loopback mode of operation. In other words, whatever signal is transmitted by the external device over the AUXIN line will be fed back to the external device over the AUXOUT line. This mode is accomplished by connecting pins 1 and 2 of the jumper blocks J11 and J12. Figure 19 shows how to select this loopback mode.
WARNING: When operating in half-duplex mode, the transmitter drivers must be disabled before receiving any data. Failure to do so may result in multiple active output drivers being connected together, which may cause damage to the board, the computer, and the external device.
7.6 Termination Resistors No termination resistors are provided on the ports. Both output and input signals are connected only to the external connector. Any termination which is required must be added externally. RS-422/485 Receiver RXD+ + Rt - RXD- RS-422/485 Receiver AUXIN+ + Rt - AUXIN- Recommended Termination Resistor Values RS-422 100 ohm 1/2W resistor RS-485 60 ohms total resistance (120 ohms at each end) Figure 21.
7.7 RS-422/485 Peripheral Connection The DSC-200/300 is a DTE device which connects to peripheral equipment through two female D-9 connectors. The standard serial port connections are listed in Figure 22. 7.8 RS-422/485 Peripheral Connection The DSC-200/300 connects to peripheral equipment through two female D-9 connectors. The serial port connector definitions are listed in Figure 22.
8 PCI Resource Map Listed below are the PCI resources used by the DSC-200/300. Such information may be of use to customers writing their own device drivers or other custom software. A detailed description of the DSC-200/300's UARTs is available on the Quatech web site. (all numbers in hex) PCI Vendor ID: 0x135C Quatech, Inc.
9 Specifications Bus interface: PCI, 32-bit bus, Universal Signalling Voltage IBM-compatible computers Dimensions: approx. 4.725" x 3.5" Serial ports Controller: Interface: 16550 with 16-byte FIFOs Two female D-9 connectors Transceivers: MAX-3076E or compatible Differential output: 2V min. with 50-ohm load (RS-422) 1.5V min. with 27-ohm load (RS-485) Output rise/fall time: 15ns max. Differential input threshold: -0.2V min., -0.05V max. Input resistance: 96k ohm min.. Input current: -100 microAmps min.
10 Troubleshooting Listed here are some common problems and frequent causes of those problems. If the information here does not provide a solution, contact Quatech technical support. Any unauthorized repairs or modifications will void the DSC-200/300's warranty. Computer will not boot up. 1. Is the DSC-200/300 properly inserted? Remove the card and try again. Perhaps try a different expansion slot. 2. Ensure that an ISA-bus card is not using the same IRQ that the PCI BIOS tries to assign to the DSC-200/300.
DSC-200/300 User's Manual Revision 1.
