MODEL PCI-COM422/4 USER MANUAL
Contents
1. 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 register empty flag If it 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 16 Manual PCI COM 422 4 The following C code fragment demonstrates this process outportb BASEADDR 4 inportb BASEADDR 4 0x02 Set RTS bit without altering states of other bits while datali While there is data to send while inportb BASEADDR 5 amp 0x20 Wait until transmitter is empty outportb BASEADDR datali i outportb BASEADDR 4 inportb BASEADDR 4 amp 0xFD Reset RTS bit without altering states of other bits 17 Manual PCI COM 422 4 Chapter 6 Connector Pin Assignments The popular 9 pin D subminiature connector is used for interfacing to communication lines The connector is equipped with 4 40 threaded standoffs female screw lock to provide strain relief DB 9 Male Pin No RS422 Signals Bos oo e 7 se o r BE Table 6 1 Connector Pin Assignments 18 Manual PCI COM 422 4 Customer Comments If you experience any problems with this manual or just want to give us some feedback please email us at tech portwell com Please detail any errors you find and include your mailing address so that we can send you any manual updat2. 200 to 460 800 baud 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 UO Cards provided by Microsoft in the 10 Manual PCI COM 422 4 MSDN library documentid mk ivt nt40res D15 S55FC HTM also available in the WindowsNT Resource Kit The text enclosed in brackets denotes a comment by the editors 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 CurrentControlSet Services Serial subkey in the registry In each of these subkeys you must add values for DosDevices Interrupt InterruptStatus PortAddress and Portlndex 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 a four port card configured to use address OxFFFO with an interrupt of OxFFF8 the values in the Registry are assuming that every port is configured to use the same IRQ and that the addresses are configured to be consecutive and contiguous Serial2 Subkey Serial4 Subkey PortAddress REG_DWORD OxFFFO PortAddress REG_DWORD OxFF90 Interrupt REG_WORD 5 Interrupt REG_DWORD 5 DosDevices REG SZ COM3 DosDevice
3. MODEL PCI COM422 4 USER MANUAL FILE MPCICOM422 4 E1d Notice The information in this document is provided for reference only Portwell 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 Portwell 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 2005 by Portwell I O Products Inc 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 MAY CAUSE DAMAGE TO THE O CARD AND WILL VOID ALL WARRANTIES IMPLIED OR EXPRESSED 2 Manual PCI COM 422 4 Warranty Prior to shipment Portwell eguipment is thoroughly inspected and tested to applicable specifications However should equipment failure occur Portwell assures its customers that prompt service and support will be available All equipment originally manufactured by Portwell which is found to be defective will be repaired or replaced subject to the following considerations Terms and Conditions If a unit is suspected of failure contact Port
4. ation on installing under linux Note COM boards can be installed in virtually any operating system We do support installation in earlier versions of Windows and are very likely to support future versions as well Caution ESDA single static discharge can damage your card and cause premature failure Please follow all reasonable precautions to prevent a static discharge such as grounding yourself by touching any grounded surface prior to touching the card 8 Manual PCI COM 422 4 Hardware Installation 1 o ARON o 10 11 Make sure to set switches and jumpers from either the Option Selection section of this manual or from the suggestions of SETUP EXE Do not install card into the computer until the software has been fully installed Turn OFF computer power AND unplug AC power from the system Remove the computer cover Carefully install the card in an available 5V or 3 3V PCI expansion slot you may need to remove a backplate first Inspect for proper fit of the card and tighten screws Make sure that the card mounting bracket is properly screwed into place and that there is a positive chassis ground Install an I O cable onto the card s bracket mounted connector Replace the computer cover and turn ON the computer 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 Windows 95 98 2000 XP 2003 or any other PNP compliant operatin
5. cular 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 14 Manual PCI COM 422 4 Initialization Initializing the chip reguires 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 outportb BASEADDR 3 0x80 You then load the divisor into Base Address 0 low byte and Base Address 1 high byte The following eguation defines the relationship between baud rate and divisor desired baud rate UART clock freguency 32 divisor On the card the UART clock freguency is 1 8432 MHz The following is a table for the popular divisor freguencies Baud Rate Divisor Max Diff Cable Length 19200 Je Lamm 14400 s Lan 1200 Je Laun 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 RS 232 communication lines have a maximum length of 50 feet regardless of speed Table 5 1 Baud Rate Divisor Values In C the c
6. d for effective transmission in RS422 EIA422 protocol The card is 6 1 inches long and may be installed in PCl bus slots of IBM PC or compatible computers The card features four independent asynchronous RS422 serial ports type 16550 buffered UARTs and for Windows compatibility automatic control to transparently enable disable the transmission drivers There are two I O connector options The standard model includes a single DB25 male connector on the mounting bracket plus a breakout cable that terminates in four 9 pin female connectors The optional model has two 9 pin male connectors on the card mounting bracket plus a second mounting bracket with two more 9 pin male connectors with ribbon cables to connect them to headers on the card RS422 Balanced Mode Operation The card supports RS422 communications and uses differential balanced drivers for long range and noise immunity This card also has the capability to add load resistors to terminate the communications lines RS422 communications reguires 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 card supports biasing by default and supports termination by jumpers on the card If your application reguires 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 incl
7. e software provided with this card is on CD and must be installed onto your hard disk prior to use To do this perform the following steps as appropriate for your operating system Configure Card Options via Jumper Selection Before installing the card into your computer carefully read Chapter 3 Option Selection of this manual then configure the card according to your reguirements and protocol RS 232 RS 422 RS 485 4 wire 485 etc Our Windows based setup program can be used in conjunction with Chapter 3 to assist in configuring jumpers on the card as well as provide additional descriptions for usage of the various card options such as termination bias baud rate range RS 232 RS 422 RS 485 etc CD Software Installation The following instructions assume the CD ROM drive is drive D Please substitute the appropriate drive letter for your system as necessary DOS 1 Place the CD into your CD ROM drive 2 Type Jte to change the active drive to the CD ROM drive 3 Type Jalstial les to run the install program 4 Follow the on screen prompts to install the software for this board WINDOWS 1 Place the CD into your CD ROM drive 2 The system should automatically run the install program If the install program does not run promptly click START RUN and type JJno click OK or press Ed 3 Follow the on screen prompts to install the software for this board LINUX 1 Please refer to linux htm on the CD ROM for inform
8. ers described in this section refer to Figure 3 2 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 Tx Rx R LDxO 1200 DIU TX RX Figure 3 1 Simplified Termination Schematic In RS422 operations where there are multiple terminals only the RS422 ports at each end of the network should have terminating 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 and COM D ports place jumpers at locations labeled LDBO LDCO and LDDO respectively Similarly inputs are terminated at jumpers labeled LDAI LDB1 etc Also for RS422 operation there must be a bias on the Tx and Tx lines If the card is not to provide that bias contact the factory technical support Data Cable Wiring SignalPin Connection TX 2 TX 3 RX 9 RX 1 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
9. es 19 Manual PCI COM 422 4
10. g system should set the CMOS option to OS Systems running under DOS Windows NT 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 Most computers should auto detect the card depending on the operating system and automatically finish installing the drivers Run PClfind exe to complete installing the card into the registry for Windows only and to determine the assigned resources Run one of the provided sample programs that was copied to the newly created card directory from the CD to test and validate your installation Input Output Connections There are two I O connector configurations The typical model card has a male DB25 connector on the card mounting bracket and breakout cables that terminate in four female DB9 connectors The optional model has two DB9 connectors on the card mounting bracket Ports A and B and two more DB9 connectors on a separate mounting bracket for Ports C and D 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 good connection to the chassis Also proper EMI cabling technigues cable connect to chassis at the aperture shielded twisted pair wiring etc be used for the input output wiring 9 Manual PCI COM 422 4 Chapter 3 Option Selection To help you locate the jump
11. is responsible for all charges caused by modifications or additions to Portwell equipment not approved in writing by Portwell or if in Portwell 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 Portwell 3 Manual PCI COM 422 4 Table of Contents Chapter 1 Introduchon eee eee eee eee eee nenene eee nenene n tn n 5 Figure 1 1 Block Diagram Only One Serial Channel Shown eee eee eee een n 7 Chapter 2 Installaton eee eee eee eee eee eee eee nenene eee nene nen tn 8 Chapter 3 Option geren egene node bela ne ove ky duolatal kolukeib s 10 Figure 3 1 Simplified Termination Gchemate eee eee eee e een 10 Figure 3 2 Option Selection Map 12 Chapter 4 Address Selection eee eee eee eee ee eee nenene 13 Chapter 5 Programming eee eee eee eee eee ee eee e eee a anne nn 14 Table 5 1 Baud Rate Divisor Values 442 22 eeeee2eeeeee00 eee een 00 e RKK e RKK KKK en 15 Chapter 6 Connector Pin Assignments eee eee eee 18 Table 6 1 Connector Pin Assignments 2 2222 eeee eee eee eee nene een een een n ent n 18 4 Manual PCI COM 422 4 Chapter 1 Introduction The card was designe
12. ist of all of the 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 Windows95 or PCINT WindowsNT or the Device Manager utility from the System Properties Applet of the control panel The card 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 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 this card is 494F ASCII for IO The Device ID for the card is 1058h 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 13 Manual PCI COM 422 4 Chapter 5 Programming Sample Programs There are sample programs provided with the 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 card installs into Windows as COM ports Thus the Windows standard API functions can be used In parti
13. it 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 inporto BASEADDR 5 amp 1 Wait until data ready data i inporto 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 interrupt or turning interrupts off for too long a period 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 RS422 transmission is simple to implement The AUTO feature of the 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
14. ode to set the chip to 9600 baud is outportb BASEADDR 0x0C outportb BASEADDR 1 0 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 O 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 O 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 15 Manual PCI COM 422 4 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 b
15. s REG SZ COM5 InterruptStatus REG DWORD OxFFF8 InterruptStatus REG DWORD OxFFF8 Portlndex REG DWORD 1 PortIndex REG DWORD 3 Serial3 Subkey Serial5 Subkey PortAddress REG DWORD OxFFEO PortAddress REG DWORD OxFF80 Interrupt REG DWORD 5 Interrupt REG DWORD 5 DosDevices REG SZ COM4 Dos Devices REG SZ COM6 InterruptStatus REG DWORD OxFFF8 InterruptStatus REG DWORD OxFFF8 Portlndex REG DWORD 2 Portlndex REG DWORD 4 11 Manual PCI COM 422 4 COMC COMD o D COM B o Se CH o TT ox 9 a KELE ELLE og mon SSES o 8883 u u m o lt d a I m fan o COM A Figure 3 2 Option Selection Map 12 Manual PCI COM 422 4 Chapter 4 Address Selection The card uses four separate address spaces COM A occupies 16 consecutive register locations and COM B COM C and COM D each occupy eight consecutive register locations 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 utility provided This utility will display a l
16. sub connectors Four shielded male D sub 9 pin IBM AT style connectors compatible with RS422 specifications Note On model an external spider or breakout cable terminates with four female D sub 9 pin connectors 5 6 7 or 8 bits Even odd or none 1 1 5 or 2 bits Up to 115 200 baud Asynchronous A faster range of rates up to 460 800 is achieved by jumper selection on the card Type 16550 buffered UART Continuously mappable within 0000 to FFFF hex range of PCI bus addresses Conforms to PCI Specification 2 1 200 mV differential input 12V to 7V Transmitter Output Drive Capability 60 mA with thermal shutdown Operating Temperature Range 0 C to 60 C Storage temperature Range Humidity Size Power Required 50 C to 120 C 5 to 95 non condensing 6 1 long 155 mm by 3 9 99 mm 5VDC at 125 mA typical 12VDC at 5 mA typical 12VDC at 5 mA typical 750 mW total power consumption 6 Manual PCI COM 422 4 OSCILLATOR m o a D m gt a o O pe L UART INTERFACE TRANSCEIVER CHIP SIMILAR Figure 1 1 Block Diagram Only One Serial Channel Shown 7 Manual PCI COM 422 4 Chapter 2 Installation A printed Quick Start Guide ASG is packed with the card for your convenience If you ve already performed the steps from the QSG you may find this chapter to be redundant and may skip forward to begin developing your application Th
17. ude 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 ensures precise selection of baud rates up to 115 200 or by changing a jumper up to 460 800 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 This card supports Full Duplex and Half Duplex communications with a 4 wire cable connection Half Duplex allows traffic to travel in both directions but only one way at a time Baud Rate Ranges The card has capability for two baud rate ranges and you can select which you wish to use on a port by port basis One range is for up to 115 200 baud applications and the other is up to 460 800 baud applications 5 Manual PCI COM 422 4 Specifications Communications Interface D Environmental D O Connection Serial Ports Character length Parity Stop Interval Serial Data Rates Address Receiver Input Sensitivity Common Mode Rejection 9 pin D
18. well 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 Portwell 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 Portwell option with no charge for labor or parts not excluded by warranty Warranty commences with equipment shipment Following Years Throughout your equipments lifetime Portwell 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 Portwell Equipment provided but not manufactured by Portwell 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 Portwell is limited to replacing repairing or issuing credit at Portwell discretion for any products which are proved to be defective during the warranty period In no case is Portwell liable for consequential or special damage arriving from use or misuse of our product The customer
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