Measurement PCI-CTR20HD User Manual
PCI-COM422/485 Series
User’s Manual
ComputerBoards, Inc.
Revision 1, January, 2000
© Copyright 2000
LIFETIME WARRANTY
Every hardware product manufactured by ComputerBoards, Inc. is warranted against defects in materials
or workmanship for the life of the product, to the original purchaser. Any products found to be defective
will be repaired or replaced promptly.
LIFETIME HARSH ENVIRONMENT WARRANTY
Any ComputerBoards, Inc. product which is damaged due to misuse may be replaced for only 50% of the current
price. I/O boards face some harsh environments, some harsher than the boards are designed to withstand. When that
happens, just return the board with an order for its replacement at only 50% of the list price. ComputerBoards does
not need to profit from your misfor tune. B y the way, we will ho nor this warranty for any other manufact ure’s board
that we have a replacement for!
TM
30 DAY MONEY-BACK GUARANTEE
Any ComputerBoards, Inc. product may be returned within 30 days of purchase for a full refund of the price paid for
the product be ing ret urned. If yo u are no t satisf ied, or cho se the wrong pr od uct b y mista ke, yo u d o no t have to keep
it. Please call for a RMA number first. No credits or returns accepted without a copy of the original invoice. So me
software products are subject to a repackaging fee.
These warranties are in lieu of all other warranties, expressed or implied, including any implied warranty of
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notified in advance of the possibility of such damages.
MEGA-FIFO, the CIO prefix to data acquisition bo a rd model numbers, the PCM prefix to data acquisition board
model numbers, PCM-DAS08, PCM-D24C3, PCM-DAC02, PCM-COM422, PCM-COM485, PCM-DMM, PCMDAS16D/12, PCM-DAS16S/12, PCM-DAS16D/16, PCM-DAS16S/16, PCI-DAS6402/16, Universal Library,
InstaCal, Harsh Environment Warranty and ComputerBoards are registered trademarks of ComputerBoards, Inc.
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Notice
ComputerBoards, Inc. does not authorize any ComputerBoards, Inc. product for use in life
support systems and/or devices without the written approval of the President of Compute rBoard s,
Inc. Life support devices/systems are devices or systems which, a) are intended for surgical
implantation into the body, or b) support or sustain life and whose failure to perform can be
reasonably expected to result in injury. ComputerBoards, Inc . products are not designed with the
components required, and are not subject to the testing required to ensure a level of reliability
suitable for the treatment and diagnosis of people.
HM PCI-COM422-485.DOC
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TABLE OF CONTENTS
1. INTRODUCTION 1
2. INSTALLATION 2
2.1 SOFTWARE INSTALLATION 2
2.2 FACTORY DEFAULT PORT CONFIGURATION: 2
2.3 HARDWARE INSTALLATION 3
2.4 SET UP THE COM PORT PARAMETERS 3
2.4.1 IF YOU ARE USING WINDOWS 95 OR 98: 3
2.4.2 IF YOU ARE USING WINDOWS NT: 3
2.4.3 TEST THE COM PORTS FOR PROPER OPERATION (COMAPP.EXE) 5
2.5 RS-485 AUTO-ENABLED MODE 6
2.6 EXTENDED BAUD RATE OPERATION 6
2.6.1 WINDOWS 95 OR 98 SPECIFIC CONFIGURATION 7
2.6.2 WINDOWS NT SPECIFIC CONFIGURATION 8
2.6.3 RESETTING CONFIGURATION ON POWER UP 8
3. HARDWARE CONNECTIONS 10
3.1 DB9F CONNECTIONS 10
3.2 PORT IDENTIFICATION 10
3.3 CHANGING THE COM PORT ASSIGNMENTS 10
3.4 STANDARD COM PORT CONFIGURATIONS 11
3.5 TERMINATION JUMPER SETTINGS 11
4. REGISTER MAP 12
4.1 REGISTER MAP OVERVIEW 12
4.2 REGISTER DESCRIPTIONS 12
4.2.1 INTERRUPT STATUS/CONTROL12
4.2.2 PORT 1 CLOCK SELECT / INTERRUPT STATUS 13
4.2.3 PORT 2 CLOCK SELECT / INTERRUPT STATUS 13
5. SPECIFICATIONS 15
6. TROUBLESHOOTING Q/A: 17
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1. INTRODUCTION
The PCI-COM422/485 family consists of one and two port, RS-422 and RS-485-compatible, serial I/O
boards designed to operate in computers with PCI bus accessory slots. The package includes complete
software drivers for Windows 95, 98 and NT that allow the boards to be installed as a standard “COM”
port in your computer.
The boards are fully plug-and-play and provide an independent UART for each port. An easy to use set
up application program allows the user to choose between RS-422 and RS-485 operation as well as to
enable the automatic transmitter enable mode in RS-485. The boards provide a maximum baud rate of
460.8 kbaud. All connections on the boards are made through DB9F connectors.
The available models are shown in the table below.
On-Board Surge FIFO
Board Number of Ports
PCI-COM422/485 1 No 16 bytes
PCI-COM422/485/S 1 Yes 16 bytes
PCI-COM422/485/2 2 No 16 bytes
PCI-COM422/485/2/S 2 Yes 16 bytes
Suppression Depth
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2. INSTALLATION
2.1 SOFTWARE INSTALLATION
Insert the PCI-COM CD into your CD drive. If your systems auto-run feature is enabled the PCI-COM
installation wizard will automatically launch.
If the installation wizard does not auto-launch, you can initiate the software installation by running the
program SETUP.EXE on the CD. Do this by locating the CD’s SETUP.EXE file in your Windows
Explorer and double clicking on it. Assuming your CD drive is the E: drive, SETUP.EXE will be in E:\
Follow the wizard’s instructions and accept the default settings if possible. An option is provided during
installation to copy an application that will restore the user settings after a reboot. This option should be
installed if the board will be operated in a mode other than the factory default configuration shown below.
2.2 FACTORY DEFAULT PORT CONFIGURATION:
Mode RS485
Transmit Control Auto Enabled
Max Baud Rate 115.2K
If the PCI-COM422/485 board will be operated at either a higher baud rate or in RS422 mode then the
configuration settings should be restored after reboot. This will prevent the end user from having to
manually reconfigure the hardware after each reboot (Figure 2-1).
Figure 2-1. Installation Option
Selecting yes to the above option during installation will cause the board settings to be stored in the
registry. When the computer is started the ComSet32.exe application will execute and restore the PCI-
COM422/485 hardware settings to their pre-shutdown state.
2
2.3 HARDWARE INSTALLATION
The PCI-COM422/485 boards are plug-and-play configured by the host operating system. There are no
switches for setting the base address or interrupt level. Configuration is controlled by your systems’
BIOS. To install the board, turn off your PC, unplug it, open it, and insert your PCI-COM422/485 board
into any available PCI slot.
To check that all ports have been properly installed you can interrogate the COM port system with the
following sequence:
If you are using Windows 95 or 98:
1. Right click on the “My Computer” Icon on your desktop.
2. Click on “Properties”.
3. Click on the “Device Manager” tab.
4. Double click on the “Ports (COM & LPT)” Icon
If you are using Windows NT:
1. Right click Start and then Settings on the Task Bar.
2. Click on “Control Panel”.
3. Click on the “Ports” icon.
The new PCI-COM ports should be listed.
2.4 SET UP THE COM PORT PARAMETERS
2.4.1 IF YOU ARE USING WINDOWS 95 OR 98:
To set the RS422/485 port parameters (e.g. baud rate, parity) follow the sequence listed above
and then double click on the port you wish to configure. The Communications Port (COM#)
Properties sheet will appear. Click on the “Port Settings” tab and change the port settings to
match your applications requirements. Click on the “Advanced” tab to select between RS422 and
RS485 mode and to set the maximum baud rate clock. Figure 2-2 below shows the Advanced
setting screen for Windows 95/98.
When “Enable RS422 Mode” is selected, the RS485 mode settings are ignored. The settings from
this page are saved in the system registry to support automatic reconfiguration after reboot.
2.4.2 IF YOU ARE USING WINDOWS NT:
To set the RS422/485 port parameters (e.g. standard baud rates, parity) use the Ports applet that can
be found in the Control Panel. Select the port you wish to configure and change the port settings to
match your applications requirements. To configure the RS422/485 mode settings and to change
the maximum baud rate execute the control panel applet PCIcom. Figure 2-3 below shows the
configuration screen that is displayed. The application supports the selection of RS422 or RS485
mode as well as maximum baud rate selection.
3
Figure 2-2. “Advanced” port settings tab for Windows 95/98.
Figure 2-3. PCIcom Control Panel Applet for Windows NT.
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