MODEL PCI-COM422/8 USER MANUAL
Contents
1. B COM C COM D COM E COM F and COM H ports i Tx Rx place jumpers at locations labeled LDBO LDCO LDDO LDEO LDFO LDGO and LDHO respectively Similarly Inputs are terminated at jumpers labeled LDAL LDB1 etc Figure 3 1 Simplified Termination Schematic Also for RS422 operation there must be a bias on the RX and RX lines If the COM422 8 card is not to provide that bias contact the factory technical support Data Cable Wiring Signal Pin Connection Ain 1 Aout 2 Aout 3 100 Q to Ground 5 Aint 9 Baud Rate Ranges The jumpers labeled CLK X1 and CLK X4 provide means to select baud rates in either of two ranges When in the X1 position the baud rate range is up to 115 200 baud When in the CLK X4 position the baud rate range is 200 to 921 600 baud Manual MPCICOM422 8 D1d Page 3 1 PCI COM422 8 Manual A LOAD A LOAD LOAD COM B LOAD COM CLOAD JCOM C LOAD D LOAD COM D LOAD COM E LOAD COM E LOAD COM F LOAD COM F LOAD LOAD LOAD COMHLOAD LOAD QUTPUT INPUT REPIT INPUT INPUT OUTPUT INPUT OUTPUT INPUT OUTPUT INPUT OUTPUT INPUT OUTPUT INPUT BAUD SOURCE JUMPERS COMA COMB COM C COM D COME COMF COMG COMH oon 900 oog 995 ogg 990 18 990 1 4 12. In C code the call would be outportb BASEADDR 3 0 80 You then load the divisor into Base Address 0 low byte and Base Address 1 high byte The following equation defines the relationship between baud rate and divisor desired baud rate UART clock frequency 32 divisor On the PCI COM422 8 card UART clock frequency is 1 8432 MHz On the next page isa table for the popular divisor frequencies Manual MPCICOM422 8 D1d Page 5 1 PCI COM422 8 Manual Baud Rate Divisor Divisor Max Diff Cable Length 1 8 921600 1 250 ft 460800 N A 2 500 ft 230400 N A 4 800 ft 153600 N A 6 1300 ft 115200 1 8 2200 ft 57600 2 16 4000 ft 38400 3 24 4000 ft 28800 4 32 4000 ft 19200 6 48 4000 ft 14400 8 64 4000 ft 4800 192 4000 ft 2400 384 4000 ft 1200 9 768 4000 ft These are theoretical maximums based on typical conditions and good quality cables based on the EIA 485 and EIA 422 standard for balanced differential drivers RS232 communication lines have a maximum length of 50 feet regardless of speed Table 5 1 Baud Rate Divisor Values In C the code to set the chip to 9600 baud is outportb BASEADDR 0x0C outportb BASEADDR 1 0 Page 5 2 Manual MPCICOM422 8 D1d The second initializing step is to set the Line Control Register at Base Address 3 This register defines word length stop bits parity and the DLAB Bits 0 and 1 control word length and allow word lengths from 5 to 8 bi
3. 4 x1 x4 x1 x4 x1 x4 x1 x4 x1 x4 x1 x4 Figure 3 2 PCI COMA22 8 Option Selection Map Page 3 2 Manual MPCICOMA22 8 D 1d Figure 3 3 Low Profile PCI COM485 8 Option Selection Manual MPCICOM422 8 D1d Page 3 3 Chapter 4 Address Selection The PCI COM422 8 card uses one address space COM A COM B COM C COM D COM E COM F COM G and COM H each occupy eight consecutive register locations The interrupt register which indicates which port or ports caused the interrupt is located at base address 64 PCI architecture is Plug and Play This means that the BIOS or Operating System determines the resources assigned to PCI cards rather than you selecting those resources with switches or jumpers As a result you cannot set or change the card s base address You can only determine what the system has assigned To determine the base address that has been assigned run the PCIFind EXE or PCINT utility program provided This utility will display a list of all of the ACCES cards detected on the PCI bus the addresses assigned to each function on each of the cards and the respective IRQs if any allotted Alternatively some operating systems Windows95 98 2000 can be queried to determine which resources were assigned In these operating systems you can use either PCIFind DOS or PCINT Windows95 98 NT or the Device Manager utility from the System Applet of the control panel The PCI COM422 8 is installe
4. START SETTINGS CONTROL PANEL or MY COMPUTER CONTROL PANEL and execute the PORTS applet Click Add a dialog box titled Advanced Settings for New Port will appear Select the COM port number of an available COM port type the Base I O Port Address of COMA and the IRQ from the PCIFind screen Click OK You have now installed one port in NT Continue Clicking Add and selecting addresses for the remainder of the eight ports these steps are performed manually but could be automated by making registry entries in various registry keys Consult your Microsoft provided documentation for more information The base addresses and IRQ of the PCI COM422 8 is provided in the registry under the NTIOPCI key in a structure of type PCI COMMON CONFIG See the sample program for a demonstration of how to read this structure and extract the addresses an application program Interrupts Please note that in Windows NT changes must be made to the system registry to support IRQ sharing The following is excerpted from Controlling Multiport Serial I O Cards provided by Microsoft in the MSDN library documentid mk ivt nt40res D15 S55FC HTM also available in the WindowsNT Resource Kit The Microsoft serial driver can be used to control many dumb multiport serial cards Dumb indicates that the control includes no on board processor Each port of a multiport card has a separate subkey under the HKLM CurrentControlSet Services Serial Parameters subk
5. for using ACCES32 DLL are provided in this directory Using this DLL not only makes the hardware programming easier MUCH easier but also one source file can be used for both Windows 95 98 and WindowsNT One executable can run under both operating systems and still have full access to the hardware registers The DLL is used exactly like any other DLL so it is compatible with any language capable of using 32 bit DLLs Consult the manuals provided with your language s compiler for information on using DLLs in your specific environment VBACCES This directory contains sixteen bit DLL drivers for use with VisualBASIC 3 0 and Windows 3 1 only These drivers provide four functions similar to the ACCES32 DLL However this DLL is only compatible with 16 bit executables Migration from 16 bit to 32 bit is simplified because of the similarity between VBACCES and ACCES32 This directory contains PCI bus specific programs and information If you are not using PCI card this directory will not be installed SOURCE A utility program is provided with source code you can use to determine allocated resources at run time from your own programs in DOS PCIFind exe A utility for DOS and Windows to determine what base addresses and IRQs are allocated to installed PCI cards This program runs two versions depending on the operating system Windows 95 98 NT displays a GUI interface and modifies the registry When run from DOS or Windows3 x a text int
6. to give us some feedback please email us at manuals accesioproducts com Please detail any errors you find and include your mailing address so that we can send you any manual updates ya ACCES 1 0 PRODUCTS INC 10623 Roselle Street San Diego CA 92121 Tel 619 550 9559 FAX 619 550 7322 www accesioproducts com
7. 5 200 baud Asynchronous A faster range of rates up to 921 600 is achieved by jumper selection on the card Type 16550 buffered UART Address Continuously mappable within 0000 to FFFF hex range of PCI bus addresses Receiver Input Sensitivity 200 mV differential input Common Mode Rejection 12V to 7V Transmitter Output Drive Capability 60 mA with thermal shutdown Environmental Operating Temperature Range 0 C to 60 C Manual MPCICOM422 8 D1d Storage temperature Range 50 C to 120 C Humidity Power Required Size 5 to 95 non condensing 5VDC at 125 mA typical 12VDC at 5 mA typical 12VDC at 5 mA typical 750 mW total power consumption 7 8 Inches long 198 mm by 3 8 inches high 97 mm Page 1 3 PCI COM422 8 Manual OSCILLATOR COMPUTER BUS DB50M PCI UART INTERFACE be TRANSCEIVER CHIP SIMILAR Figure 1 1 PCI COM422 8 Block Diagram Only one serial channel shown Page 1 4 Manual MPCICOM422 8 D1d Chapter 2 Installation The software provided with this card is contained on either one CD or multiple diskettes and must be installed onto your hard disk prior to use To do this perform the following steps as appropriate for your software format and operating system Substitute the appropriate drive letter for your CD ROM or disk drive where you see d or a respectively in the examples below CD Installation DOS WIN3 x 1 Place the CD into your CD
8. A22 8 also has the capability to add load resistors to terminate the communications lines RS422 communications requires that a transmitter supply a bias voltage to ensure a known zero state Also receiver inputs at each end of the network should be terminated to eliminate ringing The PCI COMA22 8 supports biasing by default and supports termination by jumpers on the card If your application requires the transmitter to be un biased please contact the factory COM Port Compatibility Type 16550 UARTS are used as the Asynchronous Communication Element ACE These include a 16 byte transmit receive buffer to protect against lost data in multitasking operating systems while maintaining 100 compatibility with the original IBM serial port The system assigns the address es A crystal oscillator is located on the card This oscillator permits precise selection of baud rates up to 115 200 or by changing a jumper up to 921 600 with the standard crystal oscillator The driver receiver used the SN75176B is capable of driving extremely long communication lines at high baud rates It can drive up to 60 mA on balanced lines and receive inputs as low as 200 mV differential signal superimposed on common mode noise of 12 V or 7 V case of communication conflict the driver receivers feature thermal shutdown Communication Mode PCI COMA22 8 supports Full Duplex and Half Duplex communications with a 4 wire cable connection Half Duplex allo
9. ROM drive 2 Type 2 to change the active drive to the CD ROM drive 3 Type 29 to run the install program 4 Follow the on screen prompts to install the software for this card WIN95 98 NT 1 Place the CD into your CD ROM drive 2 The CD should automatically run the install program after 30 seconds Ifthe install program does not run click START RUN and type d install click OK or press Ed 3 Follow the on screen prompts to install the software for this card 3 5 Inch Diskette Installation As with any software package you should make backup copies for everyday use and store your original master diskettes ina safe location The easiest way to make a backup copy 1 to use the DOS DISKCOPY utility In a single drive system the command is jJ All fered You will need to swap disks as requested by the system In a two disk system the command is Ale Bll fered This will copy the contents of the master disk in drive to the backup disk in drive Manual MPCICOM422 8 D1d Page 2 1 PCI COM422 8 Manual To copy the files on the master diskette to your hard disk perform the following steps 1 Place the master diskette into a floppy drive 2 Change the active drive to the drive that has the diskette installed For example if the diskette is in drive A type 3 Type and follow the on screen prompts Directories Created on the Hard Di
10. WORD 5 DosDevices SZ COMIO InterruptStatus DWORD 0 40 PortIndex REG DWORD 6 Serial Subkey PortAddress REG DWORD 0xFC30 Interrupt REG DWORD 5 DosDevices SZ COMII InterruptStatus DWORD 0 40 PortIndex REG DWORD 7 Serial Subkey PortAddress REG_DWORD 0xFC38 Interrupt REG DWORD 5 DosDevices REG SZ COMI2 InterruptStatus DWORD 0 40 PortIndex REG DWORD8 As this example shows the shared IRQ status Register is located at Base address 0x40 Manual MPCICOMA22 8 D 1d Page 2 7 PCI COM422 8 Manual Page 2 8 Manual MPCICOM422 8 D1d Chapter 3 Option Selection To help you locate the jumpers described in this section refer to the Option Selection Map at the end of this section Operation of the serial communications section is determined by jumper installation as described in the following paragraphs Terminations A transmission line should be terminated at the receiving end in its characteristic impedance Installing a jumper at the locations labeled LDxO and LDxI apply a 1200 load across the transmit receive input output for RS422 operation In RS422 operations where there are multiple Tx Rx terminals only the RS422 ports at the receiver end of the network should have terminating A COM422LD impedance as described above To so terminate 1209 the COM A port place a jumper at the location oip labeled To terminate
11. al Authorization RMA number which must appear on the outer label of the return package All units components should be properly packed for handling and returned with freight prepaid to the ACCES designated Service Center and will be returned to the customer s user s site freight prepaid and invoiced Coverage First Three Years Returned unit part will be repaired and or replaced at ACCES option with no charge for labor or parts not excluded by warranty Warranty commences with equipment shipment Following Years Throughout your equipment s lifetime ACCES stands ready to provide on site or in plant service at reasonable rates similar to those of other manufacturers in the industry Equipment Not Manufactured by ACCES Equipment provided but not manufactured by ACCES is warranted and will be repaired according to the terms and conditions of the respective equipment manufacturer s warranty General Under this Warranty liability of ACCES is limited to replacing repairing or issuing credit at ACCES discretion for any products which are proved to be defective during the warranty period Inno case is ACCES liable for consequential or special damage arriving from use or misuse of our product The customer is responsible for all charges caused by modifications or additions to ACCES equipment not approved in writing by ACCES or ifin ACCES opinion the equipment has been subjected to abnormal use Abnormal use for purposes of this warranty is de
12. d in the Data Acquisition class of the Device Manager list Selecting the card clicking Properties and then selecting the Resources Tab will display a list of the resources allocated to the card The PCI bus supports 64K of I O space so your card s addresses may be located anywhere in the 0000 to FFFF hex range Vendor ID code is 494F ASCII for I O Device ID code is 1068 Manual MPCICOM422 8 D1d Page 4 1 Chapter 5 Programming Sample Programs There are sample programs provided with the PCI COM422 8 card in C Pascal QuickBASIC and several Windows languages DOS samples are located in the DOS directory and Windows samples are located in the WIN32 directory Windows Programming The PCI COM422 8 card installs into Windows as COM ports Thus the Windows standard API functions can be used In particular gt CreateFile and CloseHandle for opening and closing a port gt SetupComm SetCommTimeouts GetCommState and SetCommState to set and change a port s settings gt ReadFile and WriteFile for accessing a port See the documentation for your chosen language for details Under DOS the process is very different The remainder of this chapter describes DOS programming Initialization Initializing the chip requires knowledge of the UART s register set The first step is to set the baud rate divisor You do this by first setting the DLAB Divisor Latch Access Bit high This bit is Bit 7 at Base Address 3
13. dware devices Therefore in order to tell Windows NT that you have installed eight new COM ports you must use the utilities provided by NT in the Control Panel Once you have installed the card in the computer and the system is booted to Windows NT 4 0 Service Pack 3 or higher is recommended you will also need to install several drivers and utilities provided These utilities are designed to detect the location of the hardware and report the base address and IRQ assignments for your use The TOOLS diskette contains these programs Place the TOOLS disk in a floppy drive ex A click the Start Menu select the Run menu item and type A INSTALL enter This will run the installation program from the floppy disk to install the software to your hard disk Once the software installation is complete run PCIFind EXE from the root directory created on the hard disk This program copies NTIOPCI SYS to the NT SYSTEM32 DRIVERS directory and dynamically loads and runs the driver Note If you previously installed an older version of NTIOPCI SYS please delete the file from your NT SYSTEM32 DRIVERS directory prior to running PCIFind Manual MPCICOM422 8 D1d Page 2 5 PCI COM422 8 Manual PCIFind displays the list of COM addresses and the IRQ assigned and adds all pertinent registry entries The following steps are only necessary if there is a problem running PCIFind and the registry is not updated Open the CONTROL PANEL START RUN CONTROL
14. e ACCES PRODUCTS INC 10623 Roselle Street San Diego 92121 TEL 858 550 8558 FAX 858 550 7322 MODEL PCI COM422 8 USER MANUAL FILE MPCICOM422 8 D1d The information in this document is provided for reference only ACCES does not assume any liability arising out of the application or use of the information or products described herein This document may contain or reference information and products protected by copyrights or patents and does not convey any license under the patent rights of ACCES nor the rights of others IBM PC PC XT and PC AT are registered trademarks of the International Business Machines Corporation Printed in USA Copyright 1995 by ACCES I O Products Inc 10623 Roselle Street San Diego CA 92121 All rights reserved Page iii Warranty Prior to shipment ACCES equipment is thoroughly inspected and tested to applicable specifications However should equipment failure occur ACCES assures its customers that prompt service and support will be available All equipment originally manufactured by ACCES which is found to be defective will be repaired or replaced subject to the following considerations Terms and Conditions Ifa unit is suspected of failure contact ACCES Customer Service department Be prepared to give the unit model number serial number and a description of the failure symptom s We may suggest some simple tests to confirm the failure We will assign a Return Materi
15. erface is used For information about the format of the registry key consult the card specific samples provided with the hardware In Windows NT NTioPCI SYS runs each time the computer is booted thereby refreshing the registry as PCI hardware is added or removed In Windows 95 98 NT PCIFind EXE places itself in the boot sequence of the OS to refresh the registry on each power up This program also provides some COM configuration when used with PCICOM ports Specifically it will configure compatible COM cards for IRQ sharing and multiple port issues WIN32IRQ This directory provides a generic interface for IRQ handling in Windows 95 98 NT Source code is provided for the driver greatly simplifying the creation of custom drivers for specific needs Samples are provided to demonstrate the use of the generic driver Note that the use of IRQs in near real time data acquisition programs requires multi threaded application programming techniques and must be considered an intermediate to advanced programming topic Delphi C Builder and Visual C samples are provided Manual MPCICOM422 8 D1d Page 2 3 PCI COM422 8 Manual Findbase exe DOS utility to determine an available base address for ISA bus non Plug n Play cards Run this program once before the hardware is installed in the computer to determine an available address to give the card Once the address has been determined run the setup program provided with the hardware to see instruction
16. ex than writing a polled receiver but care should be taken when installing or removing your interrupt handler to avoid writing the wrong interrupt disabling the wrong interrupt or turning interrupts off for too long a period Manual MPCICOM422 8 D1d Page 5 3 PCI COM422 8 Manual The handler would first read the Interrupt Identification Register at Base Address 2 Ifthe interrupt is for Received Data Available the handler then reads the data If no interrupt is pending control exits the routine A sample handler written in C is as follows readback inportb BASEADDR 2 if readback amp 4 Readback will be set to 4 if data are available data i inportb BASEADDR outportb 0x20 0x20 Write EOI to 8259 Interrupt Controller return Transmission To transmit a string of data the transmitter must first check Bit 5 ofthe Line Status Register at Base Address 5 That bit is the transmitter holding register empty flag Ifitis high the transmitter has sent the data The process of checking the bit until it goes high followed by a write is repeated until no data remains The following C code fragment demonstrates this process while data i While there is data to send while inportb BASEADDR 5 amp 0x20 Wait until transmitter is empty outportb BASEADDR data 1 i Page 5 4 Manual MPCICOMA22 8 D 1d Chapter 6 Connector Pin Assignments Input Output Connections The PCI COM422 8 Serial Comm
17. ey in the registry In each of these subkeys you must add values for DosDevices Interrupt InterruptStatus PortAddress and PortIndex because these are not detected by the Hardware Recognizer For descriptions and ranges for these values see Regentry hlp the Registry help file on the WindowsNT Workstation Resource Kit CD Page 2 6 Manual MPCICOMA22 8 D 1d For example if you have an eight port PCI COMA22 8 card configured to use address with an interrupt of 05 the values in the Registry are Serial Subkey PortAddress REG DWORD 0xFC00 Interrupt WORD 5 DosDevices SZ 5 InterruptStatus DWORD 0xFC40 PortIndex REG DWORD 1 Serial Subkey PortAddress REG DWORD OxFC08 Interrupt REG DWORD 5 DosDevices REG SZ COM6 InterruptStatus DWORD 0 40 PortIndex REG DWORD 2 Serial Subkey PortAddress DWORD 0 10 Interrupt REG DWORD 5 DosDevices REG SZ COM7 InterruptStatus DWORD 0 40 REG DWORD 3 Serial Subkey PortAddress REG DWORD 0 18 Interrupt REG DWORD 5 Dos Devices REG SZ 8 InterruptStatus DWORD 0 40 PortIndex DWORD4 Serial Subkey PortAddress REG DWORD OxFC20 Interrupt REG DWORD 5 DosDevices REG SZ COM9 InterruptStatus DWORD 0xFC40 REG DWORD 5 Serial Subkey PortAddress REG DWORD 0xFC28 Interrupt REG D
18. fined as any use to which the equipment is exposed other than that use specified or intended as evidenced by purchase or sales representation Other than the above no other warranty expressed or implied shall apply to any and all such equipment furnished or sold by ACCES Page iv Table of Contents Chapter 1 Introduction RS422 Balanced Mode Operation COM Port Communication Mode Baud Rate Ranges Specifications nanana aa ene Chapter 2 Installation CD Installation 3 5 Inch Diskette Installation Directories Created the Hard Disk Installing the Card Windows NT 4 0 Installation Instructions for the PCI COM422 8 Chapter 3 Option Selection Chapter 4 Address Selection Chapter 5 Sample Programs Ker Pee dre Windows Programming Initialization Reception aequa Peri aad Puedes du pg ee ae ae Ee OE T
19. ransmission de Ca COR Ri jede wc de RD E ecd ae ele de Chapter 6 Connector Pin Assignments Input Output Connections Lud aq a RR ede 5 1 1 _ 1 1 1 N 1 wo N 1 i Tu BO be BR M ch w gt 1 uh T L Tm Aldo o P Page v List of Figures Figure 1 1 PCI COM422 8 Block Diagram Figure 3 1 Simplified Termination Schematic Figure 3 2 PCI COM422 8 Option Selection Map Figure 3 3 Low Profile PCI COM485 8 Option Selection Map List of Tables Table 5 1 Baud Rate Divisor Values Table 6 1 Connection Pin Assignments Table 6 2 Data Cable Wiring Page vi Chapter 1 Introduction The PCI COM422 8 Serial Interface Card was designed for effective transmission in RS422 EIS422 protocol The card is 7 83 inches long and may be installed in PCI bus slots of IBM PC or compatible computers The card features eight independent asynchronous RS422 serial ports type 16550 buffered UARTS RS422 Balanced Mode Operation The PCI COM422 8 supports RS422 communications and uses differential balanced drivers for long range and noise immunity PCI COM
20. s on setting the address switch and various option selections Poly exe A generic utility to convert a table of data into an nth order polynomial Useful for calculating linearization polynomial coefficients for thermocouples and other non linear sensors Risc bat A batch file demonstrating the command line parameters of RISCTerm exe RISCTerm exe A dumb terminal type communication program designed for RS422 485 operation Used primarily with Remote Data Acquisition Pods and our RS422 485 serial communication product line Can be used to say hello to an installed modem RISCTerm stands for Really Incredibly Simple Communications TERMinal Installing the Card The PCI COM422 8 card can be installed five volt PCI slot ofan IBM or compatible computer Before carefully read the Option Selection section of this manual and configure the card according to yourrequirements Finally our SETUP EXE program will lead you through the process of setting the options on the PCI COM422 8 The setup program does not set the options These must be set manually by jumpers on the card To Install the Card 1 2 3 Page 2 4 Turn OFF computer power Remove the computer cover Install jumpers from either the Option Selection section of this manual or the suggestions of our SETUP EXE software program Install the card in an available PCI bus slot Replace the computer cover and turn the computer ON Enter the CMOS setup program of your sy
21. sk The installation process will create several directories on your hard disk If you accept the installation defaults the following structure will exist Root base directory containing the SETUP EXE setup program used to help you configure jumpers and calibrate the card DOS PSAMPLES A subdirectory of CARDNAME that contains Pascal samples DOS CSAMPLES A subdirectory of CARDNAME that contains C samples Win32 language Subdirectories containing samples for Win95 98 and NT WinRisc exe A Windows dumb terminal type communication program designed for RS422 485 operation Used primarily with Remote Data Acquisition Pods and our RS422 485 serial communication product line Can be used to say hello to an installed modem ACCES32 This directory contains the Windows 95 98 NT driver used to provide access to the hardware registers when writing 32 bit Windows software Several samples are provided in a variety of languages to demonstrate how to use this driver The DLL provides four functions InPortB OutPortB InPort and OutPort to access the hardware This directory also contains the device driver for Windows NT ACCESNT SYS This device driver provides register level hardware access in Windows NT Two methods of using the driver are available through ACCES32 DLL recommended and through the DevicelOControl handles provided by ACCESNT SYS slightly faster Page 2 2 Manual MPCICOM422 8 D1d SAMPLES Samples
22. stem and verify that the PCI plug and play option is set appropriately for your system Systems running Windows95 or any other PNP compliant Operating System should set the CMOS option to OS Systems running under DOS WindowsNT 3 51 Windows 3 1 or any other non PNP compliant Operating System should set the PNP CMOS option to BIOS or Motherboard Save the option and continue booting the system Manual MPCICOM422 8 D1d spider cable is provided to interface between the 50 pin SCSI connector on the card and your system cabling Eight individual 9 pin connectors are provided If you are using Windows95 your operating system should detect the new hardware and prompt you for the installation disk Insert the ACCES provided diskette into the A drive and allow the operating system to look for the files that it wants The base address assigned by BIOS or the operating system can change each time new hardware is installed into or removed from the computer PCI cards are assigned resources by the system To determine the resource assigned run PCIFind or look in the operating systems list of Detected Devices In Win95 98 NT this is the Device Manager of the system applet found in the control panel See the Tools diskette for more information on PCIFind Windows 4 0 Installation Instructions for the PCI COM422 8 Unlike Windows95 NT4 0 is not a plug and play compliant Operating System Windows NT will not auto detect and install new har
23. ts Bit settings are extracted by subtracting 5 from the desired word length Bit 2 determines the number of stop bits There can be either one or two stop bits If Bit 2 is set to 0 there will be one stop bit If Bit 2 is set to 1 there will be two stop bits Bits 3 through 6 control parity and break enable They are not commonly used for communications and should be set to zeroes Bit 7 is the DLAB discussed earlier It must be set to zero after the divisor is loaded or else there will be no communications The C command to set the UART for an 8 bit word no parity and one stop bit is outportb BASEADDR 3 0x03 Reception Reception can be handled in two ways polling and interrupt driven When polling reception is accomplished by constantly reading the Line Status Register at Base Address 5 Bit 0 of this register is set high whenever data are ready to be read from the chip A simple polling loop must continuously check this bit and read in data as it becomes available The following code fragment implements a polling loop and uses a value of 13 ASCII Carriage Return as an end of transmission marker do while inportb BASEADDR 5 amp 1 Wait until data ready data i inportb BASEADDR while data i 13 Reads the line until null character rec d Interrupt driven communications should be used whenever possible and is required for high data rates Writing an interrupt driven receiver is not much more compl
24. unications card uses a 50 pin SCSI D connector to interface to a spider cable The spider cable has eight individual 9 pin connectors provided with it To ensure that there is minimum susceptibility to EMI and minimum radiation it is important that the card mounting bracket be properly screwed into place and that there be a positive chassis ground Also proper EMI cabling techniques cable connect to chassis ground at the aperture shielded twisted pair wiring etc must be used for the input output wiring Pin Number RS 4 22 Signals Pin Number RS 422 Signals Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin 8 Pin 9 Pin 10 Pin 11 Pin 12 Pin 13 Pin 14 Pin 15 Pin 16 Pin 17 Pin 18 Pin 19 Pin 20 Pin 21 Pin 22 Pin 23 Pin 24 Pin 25 ND Ground Pin 26 Aoutt Pin 27 Aout Pin 28 Ground through 100 Ohm Pin 29 Ain Pin 30 Ain Pin 31 ND Ground Pin 32 Bouts Pin 33 Bout Pin 34 Ground through 100 Ohm Pin 35 Bint Pin 36 Bout Pin 37 ND Ground Pin 38 Pin 39 Pin 40 Ground through 100 Ohm Pin 41 Cint Pin 42 Cin Pin 43 ND Ground Pin 44 Dout Pin 45 Dout Pin 46 Ground through 100 Ohm R Pin 47 Din Pin 48 Din Pin 49 ND Ground Pin 50 Table 6 1 Connection Pin Assignments Q Q Q Q Q Manual MPCICOM422 8 D1d Page 6 1 PCI COM422 8 Manual Table 6 2 Data Cable Wiring Page 6 2 Manual MPCICOM422 8 D1d Customer Comments If you experience any problems with this manual just want
25. ws traffic to travel in both directions but only one way at a time Manual MPCICOMA22 8 D 1d Page 1 1 422 8 Baud Rate Ranges The card has capability for two baud rate range selections and can be selected through the setting of the CLK X1 CLK X4 jumper The baud rates are selected on a port by port basis One range is for up to 115 200 baud applications and the other is up to 921 600 baud applications The lower baud rate is selected when the jumper is in the CLK X1 position When the jumper is in the X1 position we can utilize the industry standard baud rate selection methodology When in the X4 position we must compensate for the new input frequency by letting the Windows operating system see the frequency at 1 4 of the selected value As an example when the X4 position is selected assume the selected baud output is to be 9600 baud The operating system would need to have defined the value of 2400 baud so that the correct system operations occur Note Refer to the Baud Rate Divisor Value Table on page 5 1 of the manual Page 1 2 Manual MPCICOM422 8 D1d Specifications Communications Interface Connection Serial Ports 50 pin SCSI D Connector Eight cable terminated shielded male D sub 9 pin with standard IBM AT Style connectors compatible with RS422 specifications Character length 5 6 7 or 8 bits Parity Even odd or none Stop Interval 1 1 5 or 2 bits Serial Data Rates Up to 11
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