MODEL PCI-COM485/8 USER MANUAL
Contents
1. 2 5 Chapter 3 Option Selection 3 1 Chapter 4 Address Selection 4 1 Chapter 5 Programming occcccccc eee eee nn 5 1 Samiple Programs cora As rein es Medea es 5 1 Windows Programming 5 1 INITIALIZATION e adn a di ee A RA LA E e 5 1 Reception ui A A KT Ue te RS 5 3 TFANSMISSION ii Ad aa ANA aa a AA 5 4 Chapter 6 Connector Pin Assignments 6 1 Input Output Connections 6 1 Appendix A Application Considerations A 1 Introduction a ate a itl aa eaten Pa A an Bs A 1 Balanced Differential Signals A 1 RS485 Data Transmission ui IA IA KIA A 3 Page v List of Figures Figure 1 1 PCI COM485 8 Block Diagram Page 1 4 Figure 3 1 Simplified Termination Schematic Page 3 1 Figure 3 2 PCl COM485 8 Option Selection Map Page 3 3 Figure 3 3 Low Profile PCI COM485 8 Option Selection Map Page 3 4 Figure A 1 Typical RS485 Two Wire Multidrop Network Page A 3 List of Tables Table 5 1 Baud Rate Divisor Values Page 5 2 Table 6 1 Connector Pin Assignments2. Page 6 1 Table 6 2 Data Cable Wiring Page 6 2 Table A 1 Connections Between Two RS422 Devices Page A 1 Table A 2 RS422 Specification Summary Page A 2 Page vi Chapter 1 Introduction The PCl COM485 8 Serial Interface Card was designed for effective multipoint transmission in RS485 EIA485 protocol The card is 7 83 inches long and may be installed in 5 volt PCl bus slots of IBM PC or compatible computers The card features eight independent asynchronous RS485 serial ports type 16550 buffered UARTSs and for Windows compatibility automatic control to transparently enable disable the transmission drivers RS485 Balanced Mode Operation The PCI COM485 8 supports RS485 communications and uses differential balanced drivers for long range and noise immunity RS485 operation involves switchable transceivers and the ability to support multiple devices on a single party line The RS485 specification defines a maximum of 32 devices on a single line The number of devices served on a single line can be expanded by use of repeaters PCI COM485 8 also has the capability to add load resistors to terminate the communications lines RS485 communications requires that one transmitter supply a bias voltage to ensure a known zero state when all transmitters are off Also receiver inputs at each end of the network should be terminated
3. 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 ROM drive 2 Type HLJ to change the active drive to the CD ROM drive 3 Type JANSJE to run the install program 4 Follow the on screen prompts to install the software for this card WIN95 98 NT 2000 1 Place the CD into your CD ROM drive Zi 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 E 3 Follow the on screen prompts to install the software for this card 3 5 Inch Diskette Installation As with anv software package vou should make backup copies for evervdav use and store vour original master diskettes ina safe location The easiest way to make a backup copy is to use the DOS DISKCOPY utility In a single drive system the command is Djs aj All fines You will need to swap disks as requested by the system In a two disk system the command is Djs Ale Bll fered This will copy the contents of the master disk in drive A to the backup disk in drive B Manual MPCI COM485 8 E1i Page 2 1 PCI COM485 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 examp
4. operate without the ground connection but may not be reliable Driver Output Voltage unloaded Driver Output Voltage loaded LD and LDGND Receiver Common Mode Voltage Range Receiver Input Resistance Table A 2 RS422 Specification Summary To prevent signal reflections in the cable and to improve noise rejection in both the RS422 and RS485 mode the receiver end of the cable should be terminated with a resistance equal to the characteristic impedance of the cable An exception to this is the case where the line is driven by an RS422 driver that is never tristated or disconnected from the line In this case the driver provides a low internal impedance that terminates the line at that end Note You do not have to add a terminator resistor to your cables when you use the PCI COM485 8 card Termination resistors for the RX and RX lines are provided on the card and are placed in the circuit when you install the LD and LDGND jumpers See the Option Selection section of this manual Page A 2 Manual MPCI COM485 8 E1i RS485 Data Transmission The RS485 Standard allows a balanced transmission line to be shared in a party line mode As many as 32 driver receiver pairs can share a two wire party line network Many characteristics of the drivers and receivers are the same as in the RS422 Standard One difference is that the common mode voltage limit is extended and is 12V to 7V Since any driver can be disconnected or tristate
5. through the DevicelOControl handles provided by ACCESNT SYS slightly faster Page 2 2 Manual MPCI COM485 8 E1i SAMPLES Samples 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 PCI This directory contains PCI bus specific programs and information If you are not using a 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 th
6. to eliminate ringing The PCI COM485 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 percent 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 rate 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 In case of communication conflict the driver receivers feature thermal shutdown Communication Mode PCI COM485 8 supports Half Duplex communications witha 2 wire cable connection Half Duplex allows traffic to travel in both directions but only one way at a time RS485 communications commonly use the Half Duplex mode since they share only a single pair of wires Manual MPCI COM485 8 E1i Page 1 1 PCI COM485 8 Manual Baud Rate Ranges The card has capability f
7. 10 InterruptStatus REG DWORD OxFC40 PortIndex REG DWORD 6 Indexed 0 Serial8 Subkey PortAddress REG DWORD 0xFC30 Interrupt REG DWORD 5 DosDevices REG_SZ COM11 InterruptStatus REG DWORD OxFC40 PortIndex REG DWORD 7 Indexed 0 Manual MPCI COM485 8 E1i Serial5 Subkey PortAddress REG_DWORD 0xFC18 Interrupt REG_DWORD 5 Dos Devices REG SZ COM8 InterruptStatus REG DWORD OxFC40 PortIndex REG DWORD4 Serial9 Subkey PortAddress REG DWORD 0xFC38 Interrupt REG DWORD 5 DosDevices REG SZ COM12 InterruptStatus REG DWORD OxFC40 PortIndex REG DWORD8 Indexed 0 Indexed 0 COM A LOAD BAUD SOURCE COMB LOAD JUMPERS COMA COMB COMC COMD COME COM F COM G COMH s ooo slate lej elmu DOG 00 ufaulu L COM C LOAD x4 x1 x4 xi x4 xi x4 x1 x4 x1 x4 x1 x4 x1 x4 xi COM D LOAD COM E LOAD COM F LOAD COM G LOAD COM H LOAD Manual MPCI COM485 8 E1i Figure 3 2 PCI COM485 8 Option Selection Map Page 3 3 PCI COM485 8 Manual Figure 3 3 Low Profile PCI COM485 8 Option Selection Map Page 3 4 Manual MPCI COM485 8 E1i Chapter 4 Address Selection The PCI COM485 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 a
8. 24 Unused Pin 49 Pin 25 ND Ground Pin 50 GN Ground Table 6 1 Connector Pin Assignments Q Q Manual MPCI COM485 8 E1i Page 6 1 PCI COM485 8 Manual Table 6 2 Data Cable Wiring Page 6 2 Manual MPCI COM485 8 E1i Appendix A Application Considerations Introduction Working with RS422 and RS485 devices is not much different from working with standard RS232 serial devices and these two standards overcome deficiencies in the RS232 standard First the cable length between two RS232 devices must be short less than 50 feet at 9600 baud Second many RS232 errors are the result of noise induced on the cables The RS422 standard permits cable lengths up to 5000 feet and because it operates in the differential mode it is more immune to induced noise Connections between two RS422 devices with CTS ignored should be as follows Device 1 Device 2 Table A 1 Connections Between Two RS422 Devices A third deficiency of RS232 is that more than two devices cannot share the same cable This is also true for RS422 but RS485 offers all the benefits of RS422 plus allows up to 32 devices to share the same twisted pairs An exception to the foregoing is that multiple RS422 devices can share a single cable if only one will talk and the others will all receive Balanced Differential Signals The reason that RS422 and RS485 devices can drive longer lines with more noise immunity than RS232 devices is that a balanced differential d
9. PCI slot of an IBM or compatible computer Before carefully read the OPTION SELECTION section of this manual and configure the card according to your requirements Finally our SETUP EXE program will lead you through the process of setting the options on the PCI COM485 8 The setup program does not set the options These must be set manually by jumpers on the card Page 2 4 Manual MPCI COM485 8 E1i To Install the Card 1 Turn OFF computer power 2 Remove the computer cover 3 Install jumpers from either the Option Selection section of this manual or the suggestions of our SETUP EXE software program 4 Install the card in an available PCI bus slot 5 Replace the computer cover and turn the computer ON 6 Enter the CMOS setup program of your system 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 A 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 Windows NT 4 0 Installation Instructions for the PCI COM485 8 Unlike Windows95 NT is not a Plug and Play compliant Operating System Wi
10. anual MPCI COM485 8 E1i Page 5 1 PCI COM485 8 Manual On the PCI COM485 8 card the UART clock frequency is 1 8432 MHz Below is a table for the popular divisor frequencies Baud Rate Divisor Divisor Max Diff Cable Length xi x8 921600 N A 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 2400 384 4000 ft 768 4000 ft These are theoretical mazimums based on typical conditions and good guality cables based onthe EIA 485 and EIA 422 standard for balanced differential drivers Table 5 1 Baud Rate Divisor Values In C the code to set the chip to 9600 baud is outportt BASEADDR 3 0X80 enters baud divisor setup mode outportt BASEADDR 0x0C outportb BASEADDR 1 0 Page 5 2 Manual MPCI COM485 8 E1i 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 bits 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 use
11. ble 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 defined 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 1 1 RS485 Balanced Mode Operation 1 1 COM Port Compatibility 1 1 Communication Mode AI a aaa i eee ee 1 1 Bauid Rate Ranges ote ii A RIA A OY ES 1 2 Auto RTS Transceiver Control 1 2 Sp cifications rare a it AE Pe AL we lee ale a eS 1 3 Chapter 2 Installation 2 1 CDi Installations un ra A A RA hate we Bs 2 1 3 5 Inch Diskette Installation 2 1 Directories Created on the Hard Disk 2 2 l stalling the Cardo ee ia 2 4 Windows NT 4 0 Installation Instructions for the PCI COM485 8
12. ced subject to the following considerations Terms and Conditions If a 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 Material 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 lia
13. com PCI COM485 8 Manual Page A 6 Manual MPCI COM485 8 E1i
14. d from the line it must withstand this common mode voltage range while in the tristate condition The following illustration shows a typical multidrop or party line network Note that the transmission line is terminated on both ends of the line but not at drop points in the middle of the line TERMINATION RESISTORS AT BOTH ENDS ONLY TX ENABLE TX ENABLE RX ENABLE RX ENABLE TX ENABLE TX ENABLE RX ENABLE 9 P RX ENABLE Figure A 1 Typical RS485 Two Wire Multidrop Network RS485 Four Wire Multidrop Network An RS485 network can also be connected in a four wire mode In a four wire network it s necessary that one node be a master node and all others be slaves The network is connected so that the master communicates to all slaves and all slaves communicate only with the master This has advantages in equipment that uses mixed protocol communications Since the slave nodes never listen to another slave s response to the master a slave node cannot reply incorrectly Manual MPCI COM485 8 E1i Page A 3 Customer Comments If you experience any problems with this manual or just want 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 fa ACCES I O PRODUCTS INC 10623 Roselle Street San Diego CA 92121 Tel 858 550 9559 FAX 858 550 7322 www accesioproducts
15. d 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 The final initialization step is to flush the receiver buffers You do this with two reads from the receiver buffer at Base Address 0 When done the UART is ready to use 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 complex 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
16. e operating system Windows 95 98 NT displays a GUI interface and modifies the registry When run from DOS or Windows3 x a text interface 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 MPCI COM485 8 E1i Page 2 3 PCI COM485 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 availab
17. g ACCES I O PRODUCTS INC 10623 Roselle Street San Diego CA 92121 TEL 858 550 9559 FAX 858 550 7322 MODEL PCI COMA85 8 USER MANUAL FILE MPCI COM485 8 E1i Notice 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 2001 by ACCES I O Products Inc 10623 Roselle Street San Diego CA 92121 All rights reserved WARNING ALWAYS CONNECT AND DISCONNECT YOUR FIELD CABLING WITH THE COMPUTER POWER OFF ALWAYS TURN COMPUTER POWER OFF BEFORE INSTALLING A CARD CONNECTING AND DISCONNECTING CABLES OR INSTALLING CARDS INTO A SYSTEM WITH THE COMPUTER OR FIELD POWER ON MA Y CAUSE DAMAGE TO THE 1 0 CARD AND WILL VOID ALL WARRANTIES IMPLIED OR EXPRESSED Page 111 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 whichis found to be defective will be repaired or repla
18. his card is 494F ASCII for IO The Device ID for the PCI COM485 8 is 1069h Manual MPCI COM485 8 E1i Page 4 1 Chapter 5 Programming Sample Programs There are sample programs provided with the PCI COM485 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 PCl COM485 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 In C code the call would be outportt BASEADDR 3 0x80 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 M
19. interrupt or turning interrupts off for too long a period Manual MPCI COM485 8 E1i Page 5 3 PCI COM485 8 Manual The handler would first read the Interrupt Identification Register at Base Address 2 If the 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 RS485 transmission is simple to implement The AUTO feature of the PCI COM485 8 card automatically enables the transmitter when data is ready to send so no software enabling is required The following software example is for non AUTO operation To transmit a string of data the transmitter must first check Bit 5 of the Line Status Register at Base Address 5 That bit is the transmitter holding re gister emptv flag Ifit is 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 outportt BASEADDR 4 inportb BASEADDR 4 0x02 Set RTS bit without altering states of other bits while data i While there is data to send while l inportb BASEADDR 5 amp 0x20 Wait until transmitte
20. le if the diskette is in drive A type AJE 3 Type JINJSITJAJ LI LJEre and follow the on screen prompts Directories Created on the Hard Disk The installation process will create several directories on your hard disk If you accept the installation defaults the following structure will exist CARDNAME Root or base directory containing the SETUP EXE setup program used to help you configure jumpers and calibrate the card DOSIPSAMPLES 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
21. le address to give the card Once the address has been determined run the setup program provided with the hardware to see instructions 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 Setup exe This program is supplied with the PCl COM485 8 as a tool for you to use in configuring jumpers and switches on the card It is menu driven and provides pictures of the card on the computer monitor You make simple keystrokes or mouse selections to select functions The picture on the monitor then changes to show how the jumpers or switches should be placed to effect your choices The setup program is a stand alone program that can be run at any time It does not require that the card be plugged into the computer The program is self explanatory with operation instructions and on line help Installing the Card The PCI COM485 8 card can be installed in a five volt
22. ndows NT will not auto detect and install new hardware 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 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 Manual MPCI COM485 8 E1i Page 2 5 PCI COM485 8 Man
23. or two baud rate ranges and you can select which you wish to use on a port by port basis One range isup to 115 200 baud applications and the other is up to 921 600 baud Note Refer to Table 5 1 Baud Rate Divisor Values on page 5 1 of the manual Auto RTS Transceiver Control In RS485 communications the driver must be enabled and disabled as needed allowing all cards to share a two wire cable The PCI COM485 8 card controls the driver automatically With automatic control the driver is enabled when data is ready to be transmitted The driver remains enabled for one additional character s transmission time after data transfer is complete and then is disabled The recelver is also normally enabled then disabled during RS485 transmissions and then re enabled after transmission is completed plus one character transmission time The PCI COM485 8 automatically adjusts it s timing to the baud rate of the data NOTE Thanks to the automatic control feature the card is ideal for use in WIN95 applications Page 1 2 Manual MPCI COM485 8 E1i Specifications Communications Interface 1 0 Connection 50 Pin SCSI D Connector Serial Ports Eight cable terminated shielded male D sub 9 pin connectors with standard IBM AT connectors compatible with RS485 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 115 200 baud Asynchronous A faster range of rates u
24. p 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 Storage temperature Range 50 C to 120 C Humidity 5 to 95 non condensing Power Required 5VDC at 125 mA typical 12VDC at 5 mA typical 12VDC at 5 mA typical 750 mW total power consumption Size 7 8 inches long 198 mm by 3 8 inches high 97 mm Note The 16550 UART uses a 16 byte first in first out buffer which is programmed through commands sent to the FIFO control register Manual MPCI COM485 8 E1i Page 1 3 PCI COM485 8 Manual PCI INTERFACE 0 m O a x m 5 a O O CHIP OSCILLATOR UART 16550 SCSI 2 CONNECTOR OR HPBR 2150 OR EQUIVALENT SIMILAR HALF PITCH 50 PIN TRANSCEIVER CIRCUITRY Figure 1 1 PCI COM485 8 Block Diagram Page 1 4 Only one serial channel shown Manual MPCI COM485 8 E1i 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
25. port 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 subkey 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 For example if you have an eight port PCI COM485 8 card configured to use address 0xFC00 with an interrupt of 05 the values in the Registry are Serial2 Subkey PortAddress REG DWORD 0xFC00 Interrupt REG WORD 5 DosDevices REG SZ COMS InterruptStatus REG DWORD OxFC40 PortIndex REG DWORD 1 Indexed 0 Serial3 Subkey PortAddress REG_DWORD OxFC08 Interrupt REG_DWORD 5 DosDevices REG SZ COM6 InterruptStatus REG_DWORD 0xFC40 PortIndex REG DWORD 2 Indexed 0 Serial4 Subkey PortAddress DWORD OxFC10 Interrupt REG_DWORD 5 DosDevices REG SZCOM7 InterruptStatus REG_DWORD 0xFC40 PortIndex REG_DWORD 3 Indexed 0 Page 3 2 Serial6 Subkev PortAddress REG DWORD 0xFC20 Interrupt REG_DWORD 5 DosDevices REG SZ COM9 InterruptStatus REG_DWORD 0xFC40 PortIndex REG_DWORD 5 Indexed 0 Serial7 Subkey PortAddress REG DWORD 0xFC28 Interrupt REG DWORD 5 DosDevices REG SZ COM
26. r is empty outportb BASEA DDR datal i i outportt BASEADDR 4 inportb BASEADDR 4 amp 0xFD Reset RTS bit without altering states of other bits Page 5 4 Manual MPCI COM485 8 E1i Chapter 6 Connector Pin Assignments Input Output Connections The PCI COM485 8 Serial Communications 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 be used for the input output wiring PIN Number RS 485 Signals Pin Number Pin 1 ND Ground Pin 26 Pin 2 Ain out Pin 27 Pin 3 Ain out Pin 28 Pin 4 GND thru 100 Ohm Pin 29 G Q Pin 5 Unused Pin 30 Pin 6 Unused Pin 31 ND Ground Pin 32 Q ND Pin 7 ND Pin 8 Bin outt Pin 33 Pin 9 Bin out Pin 34 Pin 10 GND thru 100 Ohm Pin 35 GND thru 100 Ohm Pin 11 Unused Pin 36 Pin 12 Unused Pin 37 Pin 13 ND Ground Pin 38 GND Ground ND D Q Pin 14 Cin out Pin 39 Pin 15 Cin out Pin 40 Pin 16 GND thru 100 Ohm Pin 41 Pin 17 Unused Pin 42 Pin 18 Unused Pin 43 Pin 19 ND Ground Pin 44 Pin 20 Din out Pin 45 Pin 21 Din out Pin 46 Pin 22 GND thru 100 Ohm Pin 47 Pin 23 Unused Pin 48 Pin
27. rive method is used In a balanced differential system the voltage produced by the driver appears across a pair of wires A balanced line driver will produce a differential voltage from 2 to 6 volts across its output terminals A balanced line driver can also have an input enable signal that connects the driver to its output terminals Ifthe enable signal is OFF the driver is disconnected from the transmission line This disconnected or disabled condition is usually referred to as the tristate condition and represents a high impedance RS485 drivers must have this control capability RS422 drivers may have this control but it is not always required Manual MPCI COM485 8 E1i Page A 1 PCI COM485 8 Manual A balanced differential line receiver senses the voltage state of the transmission line across the two signal input lines If the differential input voltage is greater than 200 mV the receiver will provide a specific logic state on its output If the differential voltage input is less than 200 mV the receiver will provide the opposite logic state on its output A maximum operating voltage range is from 6V to 6V allows for voltage attenuation that can occur on long transmission cables A maximum common mode voltage rating of 7V provides good noise immunity from voltages induced on the twisted pair lines The signal ground line connection is necessary in order to keep the common mode voltage within thatrange The circuit may
28. t 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 Windows 95 98 2000 can be queried to determine which resources were assigned In these operating systems you can use either PCIFind DOS PCINT Windows95 98 NT or the Device Manager utility from the System Applet of the control panel The PCl COM485 8 is installed 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 Your card s addresses may be located anywhere in the 0000 to FFFF hex range PCIFind uses the Vendor ID and Device ID to search for your card then reads the base address and IRQ If you want to determine the base address and IRQ yourself use the following information The Vendor ID for t
29. ual Open the CONTROL PANEL START RUN CONTROL 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 All 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 COM485 8 is provided in the registry under the NTIOPCI key in a structure of type PCL COMMON CONFIG See the sample program for a demonstration of how to read this structure and extract the addresses in an application program Page 2 6 Manual MPCI COM485 8 E1i 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 Tx Rx LDxO applies a 120Q load across the transmit receive inp
30. ut output for RS485 COM485LD operation 1200 In RS485 operations where there are multiple terminals only the RS485 ports at each end of SRE the network should have terminating ji impedance as described above To so terminate the COM A port place a jumper at the location labeled LDAO To terminate the COM B COM C COM D COM E COM F and COM H ports place jumpers at locations labeled LDBO LDCO LDDO LDEO LDFO and LDHO respectively Tx Rx Figure 3 1 Simplified Termination Schematic Also for RS485 operation there must be a bias on the TRX and TRX lines Ifthe PCI COM485 8 card is not to provide that bias contact the factory technical support Data Cable Wiring Signal Pin Connection Ain out 2 Ain out 3 100 Q to Ground 5 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 400 to 921 600 baud Manual MPCI COM485 8 E1i Page 3 1 PCI COM485 8 Manual Interrupts Please note that in WindowsNT changes must be made to the system registry to support IRQ sharing The following is excerpted from Controlling Multiport Serial VO 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 multi
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