Impulse 7201 User Manual

ULTRA COMM+2.PCI

Users Manual

Part # 7201

Sealevel Systems, Inc. Telephone: 864.843.4343 PO Box 830 Fax: 864.843.3067 Liberty, SC 29657 USA www.sealevel.com

Contents

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

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

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

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

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

RS-485 ENABLE MODES ......................................................................................................................... 2

ADDRESS AND IRQ SELECTION ............................................................................................................... 3

LINE TERMINATION ................................................................................................................................. 4

ELECTRICAL INTERFACE SELECTION ....................................................................................................... 5

CLOCK MODES ........................................................................................................................................ 6

BAUD RATES AND DIVISORS FOR THE ‘DIV1’ MODE................................................................................ 7

BAUD RATES AND DIVISORS FOR THE ‘DIV2’ MODE................................................................................ 8

INSTALLATION ......................................................................................................................... 9

OPERATING SYSTEM INSTALLATION........................................................................................................ 9

Windows 95/98/ME/NT/2000/XP....................................................................................................... 9

Linux ................................................................................................................................................... 9

QNX .................................................................................................................................................... 9

PHYSICAL INSTALLATION ...................................................................................................................... 10

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

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

WHY USE AN ISP?................................................................................................................................. 11

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

RS-232 (DB-9 MALE)........................................................................................................................... 12

RS-422/485 (DB-9 MALE) ................................................................................................................... 12

SPECIFICATIONS .................................................................................................................... 13

ENVIRONMENTAL SPECIFICATIONS........................................................................................................ 13

MANUFACTURING ................................................................................................................................. 13

POWER CONSUMPTION .......................................................................................................................... 13

PHYSICAL DIMENSIONS ......................................................................................................................... 13

APPENDIX A - TROUBLESHOOTING ...................................................................................... 14

PPENDIX B - HOW TO GET ASSISTANCE............................................................................ 15

APPENDIX C - ELECTRICAL INTERFACE .............................................................................. 16

RS-232.................................................................................................................................................. 16

RS-422.................................................................................................................................................. 16

RS-485.................................................................................................................................................. 16

APPENDIX D - ASYNCHRONOUS COMMUNICATIONS ............................................................ 17

PPENDIX E - SILK-SCREEN ................................................................................................. 18

APPENDIX F - COMPLIANCE NOTICES .................................................................................. 19

FEDERAL COMMUNICATIONS COMMISSION STATEMENT ....................................................................... 19

EMC DIRECTIVE STATEMENT ............................................................................................................... 19

WARRANTY............................................................................................................................ 20

Figures

Figure 1- Headers J1B and J2B, RS-422 .......................................................................................................... 2

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

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

Figure 4 - Headers J1B and J2B, RS-485 ‘RTS’ Enabled, with ‘No Echo’ ................................................... 3

Figure 5 - Headers J1B and J2B, RS-485 ‘RTS’ Enabled, with ‘Echo’ ......................................................... 3

Figure 6 - Headers J1A and J2A, Line Termination ....................................................................................... 4

Figure 7 - Headers E1 - E4, Electrical Interface Selection.............................................................................. 5

Figure 8 - Clocking Mode ‘Divide By 4’ ........................................................................................................... 6

Figure 9 - Clocking Mode ‘Divide By 2’ ........................................................................................................... 6

Figure 10 - Clocking Mode ‘Divide By 1’ ......................................................................................................... 6

Figure 11 - Asynchronous Communications Bit Diagram.............................................................................17

Introduction

Overview

The Sealevel Systems 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 essential. 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 32,64 and 128 byte FIFOs.

What’s Included

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

• ULTRA COMM+2.PCI Serial I/O Adapter

• Serial Utility Software

• User Manual

Factory Default Settings

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

Port # Electrical Specification

Port 1 RS-422 Port 2 RS-422

To install the ULTRA COMM+2.PCI using factory default settings, refer to Installation on page 9. For your reference, record installed ULTRA COMM+2.PCI settings below:

Port # Electrical Specification

Port 1 Port 2

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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 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 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 (silk-screen ‘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 compatibility remove the jumpers at J1B and J2B.

The following examples describe all of the valid settings for J1B and J2B.

Interface Mode Examples J1B – J2B

ATRTNE

Figure 1- Headers J1B and J2B, RS-422

ATRTNE

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

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Card Setup

ATRTNE

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

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 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.

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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-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 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

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