Related Manuals for Acces I/O products LPCI-COM-1S
Summary of Contents for Acces I/O products LPCI-COM-1S
- Page 1 sales@artisantg.com artisantg.com (217) 352-9330 | Click HERE Find the Acces PCI-COM-1S at our website:...
- Page 2 10623 Roselle Street, San Diego, CA 92121 • (858) 550-9559 • FAX (858) 550-7322 contactus@accesio.com • www.accesio.com MODEL PCI-COM-1S USER MANUAL FILE: MPCI-COM-1S.Ca...
- Page 3 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, 2005 by ACCES I/O Products Inc, 10623 Roselle Street, San Diego, CA 92121. All rights reserved.
- Page 4 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.
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Page 5: Table Of Contents
Table of Contents Chapter 1: Introduction ......................5 Specifications ........................6 Figure 1-1: Block Diagram ....................7 Chapter 2: Installation ......................8 Chapter 3: Option Selection....................10 Figure 3-1: Option Selection Map ................. 11 Chapter 4: Address Selection .................... 12 Chapter 5: Programming .................... -
Page 6: Chapter 1: Introduction
Chapter 1: Introduction This Serial Communications Card was designed for use in PCI-Bus computers and provides effective communication in either RS422 (EIA422) or RS485 (EIA485) over long communication lines. The card is 4.80 inches long (122 mm) and may be installed in any 5-volt PCI slot in IBM or compatible computers. -
Page 7: Specifications
Auto-RTS Transceiver Control In Windows applications the driver must be enabled and disabled as needed, allowing all cards to share a two-wire or four-wire cable. This card controls the driver automatically. With automatic control, the driver is enabled when data are ready to be transmitted. The driver remains enabled for the transmission time of one additional character after data transfer is complete and then is disabled. - Page 8 OSCILLATOR UART Tx/Rx+ 16550 INTERFACE DB9M TRANSCEIVER SIMILAR Tx/Rx- CHIP AUTO RTS CIRCUITRY RS485 MODE ONLY Figure 1-1: Block Diagram Manual PCI-COM-1S...
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Page 9: Chapter 2: Installation
Chapter 2: Installation A printed Quick-Start Guide (QSG) 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. - Page 10 Hardware Installation 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.
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Page 11: Chapter 3: Option Selection
Chapter 3: Option Selection Four configuration options are determined by jumper position as described in the following paragraphs. Locations of the jumpers are shown in Figure 3-1, Option Selection Map. 422/485 This jumper selects either RS422 or RS485 communications mode. Termination and Bias A transmission line should be terminated at the receiving end in its characteristic impedance in order to avoid “ringing”. - Page 12 4.80" Figure 3-1: Option Selection Map Manual PCI-COM-1S...
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Page 13: Chapter 4: Address Selection
Chapter 4: Address Selection The PCI architecture is Plug-and-Play. This means the BIOS or Operating System determines the resources assigned to PCI cards, rather than the user selecting these resources with switches or jumpers. As a result, the card’s base address cannot be changed, it can only be determined. It’s possible to use the Windows95/98/NT device manager to specify system resources but that method is beyond the scope of this manual. -
Page 14: Chapter 5: Programming
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. -
Page 15: Initialization
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. - Page 16 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.
- Page 17 Transmission RS485 transmission is simple to implement. The AUTO feature in RS485 mode automatically enables the transmitter when data are ready to send, so no software enabling is required. The following software example is for non-AUTO operation in RS422 mode. First the RTS line should be set high by writing a 1 to Bit 1 of the Modem Control Register at Base Address +4.
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Page 18: Chapter 6: Connector Pin Assignments
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. Pin No. Assignment (Receive Data) (Transmit Data) (Transmit Data) GND (Signal Ground) (Receive Data) -
Page 19: Appendix A: Application Considerations
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. Second, many RS232 errors are the result of noise induced on the cables. - Page 20 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 that range. The circuit may operate without the ground connection but may not be reliable.
- Page 21 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.
- Page 22 Customer Comments If you experience any problems with this manual or just want to give us some feedback, please email us at: manuals@accesio.com.. Please detail any errors you find and include your mailing address so that we can send you any manual updates. 10623 Roselle Street, San Diego CA 92121 Tel.