Omega Engineering OMG-ULTRA-485-PCI User manual

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User’s Guide
OMG-ULTRA-485-PCI
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Contents
INTRODUCTION ..........................................................................................................................1
OVERVIEW ................................................................................................................................................1
WHAT’S INCLUDED ...................................................................................................................................1
CARD SETUP ..............................................................................................................................2
RS-485 ENABLE MODES ...........................................................................................................................2
CLOCK MODES..........................................................................................................................................2
BAUD RATES AND DIVISORS FOR THE ‘DIV1’ MODE..................................................................................3
ADDRESS AND IRQ SELECTION .................................................................................................................4
LINE TERMINATION...................................................................................................................................4
INSTALLATION ...........................................................................................................................5
OPERATING SYSTEM INSTALLATION .........................................................................................................5
WINDOWS 95/98/ME/NT/2000/XP...........................................................................................................5
LINUX .......................................................................................................................................................5
QNX .........................................................................................................................................................5
PHYSICAL INSTALLATION..........................................................................................................................6
TECHNICAL DESCRIPTION.........................................................................................................7
CONNECTOR PIN ASSIGNMENTS ................................................................................................................7
RS-422/485/530 Pin Assignments (DB-25 Male DTE) ........................................................................7
SPECIFICATIONS ........................................................................................................................8
ENVIRONMENTAL SPECIFICATIONS ...........................................................................................................8
MANUFACTURING .....................................................................................................................................8
POWER CONSUMPTION ..............................................................................................................................8
PHYSICAL DIMENSIONS.............................................................................................................................8
APPENDIX A-TROUBLESHOOTING...........................................................................................9
APPENDIX B-HOW TO GET ASSISTANCE ..............................................................................10
APPENDIX C-ELECTRICAL INTERFACE.................................................................................11
RS-422 ...................................................................................................................................................11
RS-485 ...................................................................................................................................................11
RS-530 ...................................................................................................................................................11
APPENDIX D-ASYNCHRONOUS COMMUNICATIONS ..............................................................12
APPENDIX E-SILK-SCREEN....................................................................................................13
APPENDIX F-COMPLIANCE NOTICES ....................................................................................14
FEDERAL COMMUNICATIONS COMMISSION STATEMENT.........................................................................14
EMC DIRECTIVE STATEMENT .................................................................................................................14

Introduction
OMG-ULTRA-485-PCI Page 1
Introduction
Overview
The OMG-ULTRA-485-PCI is a one channel PCI Bus serial I/O adapter. It provides one field selectable
RS-422/485/530 serial port supporting asynchronous data rates up to 460.8K bps.
Choose the RS-422 mode for long distance device connections up to 4000ft. where noise immunity and high data
integrity are essential. Select RS-485 and capture data from multiple peripherals in a RS-485 multi-drop network.
Up to 31 RS-485 devices can be connected to each port to automate your data collection.
In RS-485 mode, our special auto-enable feature allows the RS-485 ports to be viewed by the operating system as a
COM: port. This allows the standard COM: driver to be utilized for RS-485 communications. Our on-board
hardware automatically handles the RS-485 driver enable.
What’s Included
The OMG-ULTRA-485-PCI is shipped with the following items. If any of these items is missing or damaged,
please contact Omega Engineering.
•OMG-ULTRA-485-PCI Serial I/O Adapter
•Software CD

Card Setup
OMG-ULTRA-485-PCI Page 2
Card Setup
RS-485 Enable Modes
RS-485 is ideal for multi-drop or network environments. RS-485 requires a tri-state driver that will allow the
electrical presence of the driver to be removed from the line. The driver is in a tri-state or high impedance condition
when this occurs. Only one driver may be active at a time and the other driver(s) must be tri-stated. The output
modem control signal Request To Send (RTS) is typically used to control the state of the driver. Some
communication software packages refer to RS-485 as RTS enable or RTS block mode transfer.
One of the unique features of the OMG-ULTRA-485-PCI is the ability to be RS-485 compatible without the need
for special software or drivers. This ability is especially useful in Windows and OS/2 environments where the lower
level I/O control is abstracted from the application program. This ability means that the user can effectively use the
OMG-ULTRA-485-PCI in an RS-485 application with existing (i.e. standard RS-232) software drivers.
Switch SW2 is used to control the RS-485 mode functions for the driver circuit. The selections are:
‘Auto’ enable (silk-screen ‘AT’). The ‘Auto’ enable feature automatically enables/disables the RS-485 interface via
on board circuitry.
‘RTS’ enable (silk-screen ‘RT’) The ‘RTS’ mode uses the ‘RTS’ modem control signal to enable the RS-485
interface and provides backward compatibility with existing software products.
‘No Echo’ (silk-screen ‘NE’) is used to control the RS-485 enable/disable functions for the receiver circuit and
determine the state of the RS-422/485 driver. The RS-485 ‘Echo’ is the result of connecting the receiver inputs to
the transmitter outputs. Every time a character is transmitted; it is also received. This can be beneficial if the
software can handle echoing (i.e. using received characters to throttle the transmitter) or it can confuse the system if
the software does not. To select the ‘No Echo’ mode select silk-screen position ‘NE’.
Clock Modes
The OMG-ULTRA-485-PCI employs a unique clocking option that allows the end user to select from divide by 4
and divide by 1 clocking modes. SW2 positions 1 and 2 select the Divide by 1 (silk-screen D1) and Divide by 4
(silk-screen D4) modes.
To select the Baud rates commonly associated with COM: ports (i.e. 2400, 4800, 9600, 19.2, … 115.2K Bps ) set
switch SW2 in the divide by 4 mode (silk-screen D4).
To select the maximum data rate up to 460.8K bps set switch SW2 in the divide by 1 (silk-screen D1) position.
Please refer to the following page for these additional data rates.
Caution: Do not set both switches on or invalid clocking will occur.
RS-485 Mode and Clock Mode Examples (Switch SW2)
1 2 3 4
ON
OFF 5
D
1
D
4
A
T
R
T
N
E
Figure 1- Switch SW2, RS-422, Divide by 4

Card Setup
OMG-ULTRA-485-PCI Page 3
1 2 3 4
ON
OFF 5
D
1
D
4
A
T
R
T
N
E
Figure 2 – Switch SW2, RS-485 ‘Auto’ Enabled, with ‘No Echo’ Divide by 4
1 2 3 4
ON
OFF 5
D
1
D
4
A
T
R
T
N
E
Figure 3 - Switch SW2, RS-485 ‘Auto’ Enabled, with ‘Echo’ Divide by 4
Baud Rates and Divisors for the ‘Div1’ mode
The following table shows some common data rates and the rates you should choose to match them if using the
adapter in the ‘Div1’ mode.
For this Data Rate Choose this Data Rate
1200 bps 300 bps
2400 bps 600 bps
4800 bps 1200 bps
9600 bps 2400 bps
19.2K bps 4800 bps
57.6 K bps 14.4K bps
115.2 K bps 28.8K bps
230.4K bps 57.6 K bps
460.8K bps 115.2 K bps
If your communications package allows the use of Baud rate divisors, choose the appropriate divisor from the
following table:
For this Data Rate Choose this Divisor
1200 bps 384
2400 bps 192
4800 bps 96
9600 bps 48
19.2K bps 24
38.4K bps 12
57.6K bps 8
115.2K bps 4
230.4K bps 2
460.8K bps 1

Card Setup
OMG-ULTRA-485-PCI Page 4
Address and IRQ selection
The OMG-ULTRA-485-PCI is automatically assigned resources by your motherboard BIOS. Only the I/O address
may be modified by the user.
Adding or removing other hardware may change the assignment of I/O addresses and IRQs.
Line Termination
Typically, each end of the RS-485 bus must have line-terminating resistors (RS-422 terminates at the receive end
only). A 120-ohm resistor is across each RS-422/485 input in addition to a 1K-ohm pull-up/pull-down combination
that biases the receiver inputs. Switch SW1 allows customization of this interface to specific requirements. Each
switch position corresponds to a specific portion of the interface. If multiple OMG-ULTRA-485-PCI adapters are
configured in an RS-485 network, only the boards on each end should have switches T, P & P ON. Refer to the
following table for each position’s operation:
Name Function
T Adds or removes the 120 ohm termination.
P Adds or removes the 1K ohm pull-down resistor in the
RS-422/RS-485 receiver circuit (Receive data only).
P Adds or removes the 1K ohm pull-up resistor in the RS-422/RS-
485 receiver circuit (Receive data only).
L Connects the TX+ to RX+ for RS-485 two-wire operation.
L Connects the TX- to RX- for RS-485 two-wire operation.
1 2 3 4
ON
OFF 5
P P T L L
Figure 4 - Switch SW1, Line Termination

Installation
OMG-ULTRA-485-PCI Page 5
Installation
Operating System Installation
Windows 95/98/ME/NT/2000/XP
Do not install the Adapter in the machine until the software has been fully installed.
1. Start Windows.
2. Insert the software CD in to your CD drive.
3. If ‘Auto-Start’ is enabled for this drive the software will automatically launch. Otherwise, point your
browser to the ‘Index.htm’ on the root directory of the CD
4. Select ‘Install Software’.
5. Select the Part Number for your adapter from the listing.
6. Select ‘Windows 98/ME/2000/XP’. The setup file will automatically detect the operating environment and
install the proper components. Next (depending on the OS version) select the ‘Run this program from its
current location’ or ‘Open’ option. Follow the information presented on the screens that follow.
7. A screen may appear with the declaration: “The publisher cannot be determined due to the problems
below: Authenticode signature not found.” Please select the ‘Yes’ button and proceed with the installation.
This declaration simply means that the Operating System is not aware of the driver being loaded. It will not
cause any harm to your system.
8. During setup the user may specify installation directories and other preferred configurations. This program
also adds entries to the system registry that are necessary for specifying the operating parameters for each
driver. An uninstall option is also included to remove all registry/INI file entries from the system.
Linux
Refer to D:\software\seacom\Other\Linux\Linux.serial.readme (where D: = your CDROM driver letter) found on
the software CD. This file contains valuable information on installing your adapter in the various Linux releases.
Also in this sub-directory is the Linux SerialHOWTO. This series of files explains typical Linux serial
implementations, as well as informing the user to Linux syntax and preferred practices.
QNX
Refer to D:\software\seacom\Other\QNX6\Install.readme (where D: = your CDROM driver letter) found on the
software CD. This file contains valuable information on installing your adapter in the QNX6 Neutrino OS, as well
as the files required to ensure a flawless implementation. Also provided on the software CD are implementation
instructions for QNX4. These are found in D:\software\seacom\Other\QNX4\QNX_COM.txt.

Installation
OMG-ULTRA-485-PCI Page 6
Physical Installation
The adapter can be installed in any 5V PCI expansion slot and contains several jumper straps for each port that must
be set for proper.
Do not install the Adapter in the machine until the software has been fully installed.
1. Turn off PC power. Disconnect the power cord.
2. Remove the PC case cover.
3. Locate an available PCI slot and remove the blank metal slot cover.
4. Gently insert the PCI adapter into the slot. Make sure that the adapter is seated properly.
5. Replace the screw. (This is required to ensure FCC Part 15 compliance.)
6. Replace the cover.
7. Connect the power cord
Installation is finished.

Technical Description
OMG-ULTRA-485-PCI Page 7
Technical Description
The OMG-ULTRA-485-PCI provides an additional asynchronous serial port, field selectable as RS-422/485/530
for industrial automation and control applications.
The OMG-ULTRA-485-PCI utilizes the EXAR 16C850 UART. This chip features programmable baud rates, data
format, interrupt control and an industry leading 128 byte FIFOs.
Connector Pin Assignments
RS-422/485/530 Pin Assignments (DB-25 Male DTE)
Signal Name Pin # Mode
GND Ground 7
RDB RX+ Receive Positive 16 Input
RDA RX- Receive Negative 3 Input
CTSB CTS+ Clear To Send Positive 13 Input
CTSA CTS- Clear To Send Negative 5 Input
TDB TX+ Transmit Positive 14 Output
TDA TX- Transmit Negative 2 Output
RTSB RTS+ Request To Send Positive 19 Output
RTSA RTS- Request To Send Negative 4 Output
Note: These assignments meet the EIA/TIA/ANSI-530 DTE.