Quatech RS-485 manual

DSC-200/300 Two Channel RS-422/485 Asynchronous Communications Adapter for PCI bus User's Manual QUATECH, INC. TEL: (330) 655-9000 5675 Hudson Industrial Parkway FAX: (330) 655-9010 Hudson, Ohio 44236 http://www.quatech.com[...]

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 fro[...]

 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 t[...]

Declaration of Conformity Manufacturer's Name: Quatech Inc. Manufacturer's Address: 5675 Hudson Industrial Parkway Hudson, Ohio 44236 (USA) Application of Council Directive: 89/336/EEC Standards to which Conformity is Declared: * EN50081-1 (EN55022, EN60555-2, EN60555-3) * EN50082-1 (IEC 801-2, IEC 801-3, & IEC 801-4) Type of Equipmen[...]

30 6.1 OS/2 ........................................................... 30 6 Other Operating Systems ................................... 25 5.6.1 Changing Resource Settings with Device Manager ............. 23 5.6 Viewing Resources with Device Manager ........................ 22 5.5 Windows NT ................................................... 21 [...]

41 10 Troubleshooting ............................................. 40 9 Specifications ................................................. 39 8 PCI Resource Map ........................................... 38 7.8 RS-422/485 Peripheral Connection .............................. 38 7.7 RS-422/485 Peripheral Connection .............................. 37 7[...]

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 se[...]

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 fo llowing board upgrades: 1.1.1 "IND" Option --- Surge Suppression Upgrade The "IND " option p[...]

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 boa[...]

Jumpers J10-J23 define the options for this card: X8 X4 X2 J3 J4 J5 CTS0_SEL AUX0_SEL0 AUX0_SEL1 J10 J11 J12 RCLK0_SEL TG L0_SEL0 TG L0_SEL1 J13 J14 J15 RXEN0_SEL CTS1_SEL AUX1_SEL0 J16 J17 J18 AUX1_SEL1 RCLK1_SEL TG L1_SEL0 J19 J20 J21 TG L1_SEL1 RXEN1_SEL J22 J23 SPAD J2 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 se[...]

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. X8 X4 X2 J3 J4 J5 J2 SPAD Figure 3 --- Factory default clock rate and options settings 2.3.1 Enable S[...]

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. Figure 5 --- Clock multiplier jumper options X8 X4 X2 J3 J4 J5 J2 SPAD Factory defa[...]

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[...]

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 dete[...]

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 acc[...]

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. 00 - TXEN “Auto” 01 - TXEN=DTR 1[...]

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. Clock rate multiplier bit 0 RR0 0 Clock rate m[...]

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[...]

5 Windows Configuration 5.1 Windows Mille nnium 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[...]

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 fil[...]

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 Comm[...]

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 hardw[...]

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[...]

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 [...]

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. Cli[...]

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 applicatio ns when accessing a particular port. 5.6.1 Changing Resource Settings with Device Manager 1. Start the Windows 95/98/ME[...]

The X4 clock mode locks the ports hardware clock at four times the standard rate. The baud rate the port runs at will always be four times the rate requested by 460,800 X4 The X2 clock mode locks the ports hardware clock at double the standard rate. The baud rate the port runs at will always be double the rate requested by the applications. This mo[...]

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. 921,600 X8 the application. This mode is useful for legacy applications which ca[...]

Hardware automatically enables the transmitters when transmitting. Transmitters will turn off three bit-times after the last stop bit of the last character, regardless of baud rate. Used in two-wire communication. Auto Toggle DTR is set to enable the transmitters. Used in two-wire communication Half Duplex using DTR RTS is set to enable the transmi[...]

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 buf[...]

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 3[...]

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-2[...]

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-Qu[...]

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) a[...]

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[...]

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 connec[...]

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. Full-Duplex Operation Half-Duplex(DTR) Operation Half-Duplex(RTS) Operati[...]

7.6 Termination Resistors No termination resistors are provided on the ports. B oth output and input signals are connected only to the external connector. Any termination which is required must be added externally. + - RS-422/485 R eceiver Rt RXD+ RXD- + - RS-422/485 R eceiver Rt AUXIN+ AUXIN- RS-422 100 ohm 1/2W resis tor RS-485 60 ohms total resi[...]

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 connecto[...]

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. PCI Device ID: 0x0[...]

9 Specifications Bus interface: PCI, 32-bit bus, Universal Signalling Voltage IBM -compatible computers Dimensions: approx. 4.725" x 3.5" Serial ports Controller: 16550 with 16-byte FIFOs Interface: Two female D-9 connector s Transceivers: MAX-3076E or compatible Differential output: 2V min. with 50-ohm load (RS-422) 1.5V min. with 27-ohm[...]

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 car[...]

DSC-200/300 User's Manual Revision 1.12 November 2006 940-0145-112 Quatech DSC-200/300 User's Manual 42[...]