Omega RS-232 User Manual

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User’s Guide

OMG-ULTRACOMM2-PCI

Dual Port PCI RS-232/422/485 Interface Board

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The information contained in this document is believed to be correct, but OMEGA Engineering, Inc. accepts
no liability for any errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, patient-connected applications.

Contents

INTRODUCTION..........................................................................1

OVERVIEW................................................................................................1

WHAT ’S INCLUDED................................................................................ 1

FACTORY DEFAULT SETTINGS ............................................................ 1

CARD SETUP ..............................................................................2

RS-485 E NABLE MODES.........................................................................2

Interface Mode Examples J1B and J2B (continued).......................4

ADDRESS AND IRQ SELECTION............................................................4

LINE TERMINATION ............................................................................... 5

ELECTRICAL INTERFACE SELECTION.................................................6

CLOCK MODES........................................................................................7

BAUD RATES AND DIVISORS FOR THE ‘DIV1’ MODE ........................8

BAUD RATES AND DIVISORS FOR THE ‘DIV2’ MODE ........................9

INSTALLATION ........................................................................10

OPERATING SYSTEM INSTALLATION ............................................... 10

DOS.........................................................................................................10

WINDOWS 3.1X......................................................................................10

WINDOWS 95......................................................................................... 10

WINDOWS NT........................................................................................10

HARDWARE INSTALLATION ............................................................... 10

TECHNICAL DESCRIPTION.......................................................11

INTERRUPTS..........................................................................................11

WHY USE AN ISP?.................................................................................12

CONNECTOR PIN ASSIGNMENTS........................................................12

RS-232..................................................................................................12

RS-422/485..........................................................................................13

SPECIFICATIONS ......................................................................14

ENVIRONMENTAL SPECIFICATIONS..................................................14

MANUFACTURING ............................................................................... 14

POWER CONSUMPTION........................................................................14

MEAN TIME BETWEEN FAILURES (MTBF).....................................14

PHYSICAL DIMENSIONS........................................................................14

APPENDIX A - TROUBLESHOOTING.........................................15

APPENDIX B - HOW TO GET ASSISTANCE..............................16

APPENDIX C - ELECTRICAL INTERFACE ...................................17

RS-232.....................................................................................................17

RS-422.....................................................................................................17

RS-485.....................................................................................................18

APPENDIX D - ASYNCHRONOUS COMMUNICATIONS ...............19

APPENDIX E - SILK-SCREEN ....................................................20

APPENDIX F - COMPLIANCE NOTICES .....................................21

FEDERAL COMMUNICATIONS COMMISSION STATEMENT ............ 21

EMC DIRECTIVE STATEMENT ........................................................... 21

Figures

Figure 1- Headers J1B and J2B, RS-422..........................................................3

Figure 2 - Headers J1B and J2B, RS-485 ‘Auto’ Enabled, ‘No Echo’..........3

Figure 3 - Headers J1B and J2B, RS-485 ‘Auto’ Enabled, ‘Echo’................3

Figure 4 - Headers J1B and J2B, RS-485 ‘RTS’ Enabled, ‘No Echo’..........4

Figure 5 - Headers J1B and J2B, RS-485 ‘RTS’ Enabled, ‘Echo’................4

Figure 6 - Headers J1A and J2A, Line Termination.......................................5

Figure 7 Headers E1 - E4, Electrical Interface Selection...............................6

Figure 8 - Clocking Mode 'Divide By 4’............................................................7

Figure 9 - Clocking Mode 'Divide By 2’............................................................7

Figure 10 - Clocking Mode 'Divide By 1’..........................................................7

Figure 11 - Asynchronous Communications Bit Diagram..........................19

© 1998f Omega Engineering, Incorporated. All rights reserved.

Introduction

Introduction

Overview

The OMG-ULTRA COMM+2.PCI is a two channel PCI Bus serial I/O adapter for
the PC and compatibles. It provides two field selectable RS-232/422/485 serial
ports supporting data rates up to 460.8K bps.

Configure both ports as RS-232 for standard serial COM: port requirements.
Choose the RS-422 mode for long distance device connections up to 4000ft.
where noise immunity and high data integrity are essentia l. Select RS-485 and
capture data from multiple peripherals in a RS-485 multidrop network. Up to 31
RS-485 devices can be connected to each port to automate your data collection.
You can even mix the ports in any of the interface combinations to provide
maximum flexibility to your application.

In both RS-232 and RS-422 modes, the card works seamlessly with the standard
operating system serial driver. 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. UART
upgrades are available providing 32 and 64 byte FIFOs.

What’s Included

The OMG-ULTRA COMM+2.PCI is shipped with the following items. If any of
these items are missing or damaged, contact the supplier.

• OMG-ULTRA COMM+2.PCI Serial I/O Adapter

• Serial Utility Software

• User Manual

Factory Default Settings

The OMG-ULTRA COMM+2.PCI factory default settings are as follows:

Port # Electrical Specification

Port 1 RS-232
Port 2 RS-232

To install the OMG-ULTRA COMM+2.PCI using factory default settings, refer
to Installation on page 10.

For your reference, record installed OMG-ULTRA COMM+2.PCI settings below:

Port # Electrical Specification

Port 1
Port 2

Omega Engineering OMG-ULTRA COMM+2.PCI Page 1

Card Setup

Card Setup

In all cases J1x refers to settings for the first port and J2x refer to settings for
the second port.

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 COMM+2.PCI is the ability to
be RS-485 compatible without the need for special software or drivers. This
ability is especially useful in Windows, Windows NT, 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 COMM+2.PCI
in a RS-485 application with existing (i.e. standard RS-232) software drivers.

Headers J1B and J2B are used to control the RS-485 mode functions for the driver
circuit. The selections are ‘RTS’ enable (silk-screen ‘RT’) or ‘Auto’ enable (silk­screen ‘AT’). The ‘Auto’ enable feature automatically enables/disables the
RS-485 interface. The ‘RTS’ mode uses the ‘RTS’ modem control signal to
enable the RS-485 interface and provides backward compatibility with existing
software products.

Position 3 (silk-screen ‘NE’) of J1B and J2B 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’.

For RS-422/530/449 compatibility remove the jumpers at J1B and J2B.

Exampl es on the following pages describe all of the valid settings for J1B and
J2B.

Omega Engineering OMG-ULTRA COMM+2.PCI Page 2

Card Setup

Interface Mode Examples J1D – J4D

ATRTNE

Figure 1- Headers J1B and J2B, RS-422

ATRTNE

Figure 2 - Headers J1B and J2B, RS-485 ‘Auto’ Enabled, with ‘No Echo’

ATRTNE

Figure 3 - Headers J1B and J2B, RS-485 ‘Auto’ Enabled, with ‘Echo’

Omega Engineering OMG-ULTRA COMM+2.PCI Page 3

Card Setup

Interface Mode Examples J1B and J2B (continued)

ATRTNE

Figure 4 - Headers J1B and J2B, RS-485 ‘RTS’ Enabled, with ‘No Echo’

ATRTNE

Figure 5 - Headers J1B and J2B, RS-485 ‘RTS’ Enabled, with ‘Echo’

Address and IRQ selection

The OMG-ULTRA COMM+2.PCI is automatically assigned I/O addresses and
IRQs 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.

Omega Engineering OMG-ULTRA COMM+2.PCI Page 4

Card Setup

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-530/422/485 input in addition to a 1K ohm pull-up/pull-down combination that
biases the receiver inputs. Headers J1A and J2A allow the user to customize this
interface to their specific requirements. Each jumper position corresponds to a
specific portion of the interface. If multiple OMG-ULTRA COMM+2.PCI
adapters are configured in a RS-485 network, only the boards on each end should
have jumpers T, P & P ON. Refer to the following table for each position’s
operation:

Name Function

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).
T Adds or removes the 120 ohm termination.
L Connects the TX+ to RX+ for RS-485 two wire operation.
L Connects the TX- to RX- for RS-485 two wire operation.

P P T L L

Figure 6 - Headers J1A and J2A, Line Termination

Omega Engineering OMG-ULTRA COMM+2.PCI Page 5