Impulse 3189 User Manual

Ultra-SIO

Users Manual

Part # 3089 and 3189

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

ADDRESS SELECTION .............................................................................................................................. 2

PORT ENABLE / DISABLE ......................................................................................................................... 2

IRQ SELECTION ...................................................................................................................................... 3

INTERRUPT MODES ................................................................................................................................. 3

RS-485 ENABLE MODES ......................................................................................................................... 4

INTERFACE MODE EXAMPLES ................................................................................................................. 5

LINE TERMINATION ................................................................................................................................. 6

INSTALLATION ......................................................................................................................... 7

OPERATING SYSTEM INSTALLATION........................................................................................................ 7

Windows 95/98/ME/NT/2000/XP....................................................................................................... 7

Linux ................................................................................................................................................... 8

QNX .................................................................................................................................................... 8

TECHNICAL DESCRIPTION ...................................................................................................... 9

FEATURES ............................................................................................................................................... 9

CONNECTOR PIN ASSIGNMENTS (DB 9 MALE)..................................................................................... 9

SPECIFICATIONS .................................................................................................................... 10

ENVIRONMENTAL SPECIFICATIONS........................................................................................................ 10

MANUFACTURING ................................................................................................................................. 10

POWER CONSUMPTION .......................................................................................................................... 10

PHYSICAL DIMENSIONS ......................................................................................................................... 10

APPENDIX A - TROUBLESHOOTING ...................................................................................... 11

APPENDIX B - HOW TO GET ASSISTANCE............................................................................ 12

APPENDIX C - ELECTRICAL INTERFACE .............................................................................. 13

RS-422.................................................................................................................................................. 13

RS-485.................................................................................................................................................. 13

PPENDIX D - GROUND LOOP PHENOMENON ...................................................................... 14

WHAT IS GROUND LOOP?...................................................................................................................... 14

CABLING RECOMMENDATIONS .............................................................................................................. 14

PPENDIX E - ASYNCHRONOUS COMMUNICATIONS ............................................................ 15

PPENDIX F - SILK-SCREEN ................................................................................................. 16

APPENDIX G - COMPLIANCE NOTICES ................................................................................. 17

FEDERAL COMMUNICATIONS COMMISSION STATEMENT ....................................................................... 17

EMC DIRECTIVE STATEMENT ............................................................................................................... 17

ARRANTY............................................................................................................................ 18

Figures

Figure 1 - Address Selection Table.................................................................................................................... 2

Figure 2 - Header E11 and E12, IRQ Selection................................................................................................ 3

Figure 3 - Header E5 & E6, Normal IRQ Mode .............................................................................................. 3

Figure 4 - Header E5 & E6, Shared IRQ Mode ............................................................................................... 4

Figure 5 - Header E5 & E6, Sharing IRQs with another adapter.................................................................. 4

Figure 6 - RS-422 ................................................................................................................................................ 5

Figure 7 - RS-485 ‘Auto’ Enabled, with ‘No Echo’ ......................................................................................... 5

Figure 8 - RS-485 ‘Auto’ Enabled, with ‘Echo’............................................................................................... 6

Figure 9 - RS-485 ‘RTS’ Enabled, with ‘No Echo’ .......................................................................................... 6

Figure 10 - Headers E1 and E4, Line Termination.......................................................................................... 6

Figure 11 - Ultra-SIO cabling example........................................................................................................... 14

Figure 12 - Asynchronous Communications Bit Diagram.............................................................................15

Introduction

Overview

The Sealevel Systems Ultra-SIO provides the PC with two additional ground isolated RS-422/485 (P/N 3189) or two non-isolated RS-422/485 (P/N 3089) serial ports for terminals, modems, printers, etc. Isolation is important in installations where the equipment being connected to the PC is either far from the PC, or on a different power transformer circuit. Ground loop current is a commonly neglected and misunderstood phenomenon that leads to data loss and the possible destruction of communications interfaces. The isolated Ultra-SIO provides up to 500 volts DC of isolation.

What’s Included

The Ultra-SIO is shipped with the following items. If any of these items are missing or damaged, contact the supplier.

• Ultra-SIO Serial I/O Adapter (P/N 3189 with isolation or P/N 3089 without isolation)

• Sealevel Software CD

Factory Default Settings

The Ultra-SIO factory default settings are as follows:

Port # Base Address IRQ Electrical Specification

Port 1 3E8 5 RS-422 Port 2 2E8 10 RS-422

To install the Ultra-SIO using factory default settings, refer to Installation on page Error! Bookmark not defined..

For your reference, record installed Ultra-SIO settings below:

Port # Base Address IRQ Electrical Specification

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Card Setup

The Ultra-SIO contains several jumper straps that must be set for proper operation.

Address Selection

Each port on the Ultra-SIO occupies eight consecutive I/O locations. A DIP-switch is used to set the base address for these locations. SW1 sets the I/O address for port 1 and SW2 sets port 2. The following table shows the addressing options available. If different address options are required, please contact Sealevel Systems Technical Support about a custom PAL option.

1 2 3 4

3F8 On On On On 2F8 On On Off On 3E8 On Off On On 2E8 On Off Off On

2A0 Off On On On

300 Off On Off On 328 Off Off On On

Disabled Off Off Off Off

Figure 1 - Address Selection Table

Note: Each COM: port in the system should have a unique address. Typically COM1: - COM4: addresses are 3F8,

2F8, 3E8 and 2E8 Hex.

Refer to Appendix A for common address contentions.

Port Enable / Disable

Each port on the Ultra-SIO can be enabled or disabled with switch position 4 on the DIP-switch. The port is enabled with the switch ‘On’ and disabled when ‘Off’. If any port is disabled, be sure to disable the interrupt request for that port by removing the IRQ jumper.

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Card Setup

IRQ Selection

Headers E11 and E12 select the interrupt request for each serial port. If COM1: is selected, the corresponding jumper must be on the IRQ4 setting. If COM2: is selected, the corresponding jumper must be on IRQ3.

Note: Most communications software applications default COM3: to IRQ4 and COM4: to IRQ3. This requires the

sharing of interrupts between COM1: and COM3:, and between COM2: and COM4:. While this is the default, it is not always the preferred setting. Check your software configuration instructions to determine the most appropriate IRQ selection.

1514121110

2/9

Figure 2 - Header E11 and E12, IRQ Selection

Any two or more ports can share a common IRQ by placing the jumpers on the same IRQ setting at header E11 and E12 and setting the appropriate selections at E5 and E6. Note that a polling type driver is needed to share interrupts in this fashion. Windows does not supply a polling type driver. Consult your particular software for IRQ selection. If no interrupt is desired, remove the jumper.

Interrupt Modes

Header E5 and E6 selects the interrupt mode for each port. Each port must be set in the correct mode to insure proper operation.

‘N’ indicates the (N)ormal, single interrupt per port mode. ‘S’ Indicates the (S)hared interrupt mode, which allows more than one port to access a single IRQ. Any two or more ports can share a common IRQ by placing the jumpers on the same IRQ setting and setting the appropriate selections at E1. Consult your particular software for IRQ selection. If no interrupt is desired, remove the jumper. ‘M’ indicates the inclusion of a 1K ohm pull-down resistor required on one port when sharing interrupts.

NSM

1 2

Figure 3 - Header E5 & E6, Normal IRQ Mode

Set the jumpers to ‘S’ for shared interrupt mode on all blocks sharing an IRQ except one. Set that port block for ‘M’. This provides the pull-down resistor circuit that makes sharing IRQs possible. If you are using more than one Ultra- SIO or a compatible adapter in a bus you should only have one port set to ‘M’. The following example shows both ports sharing a single IRQ.

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Card Setup

NSM

1 2

Figure 4 - Header E5 & E6, Shared IRQ Mode

Set the jumper to ‘S’ if you are using more than one Ultra-SIO in a bus or to completely remove the pull-down resistor for hardware compatibility. Setting the adapter in this configuration when it is not accompanied by a

pull-down resistor will prevent the ports from triggering an interrupt.

NSM

1 2

Figure 5 - Header E5 & E6, Sharing IRQs with another adapter

RS-485 Enable Modes

RS-485 is ideal for multi-drop or network environments. RS-485 requires a tri-state driver (not dual-state) 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-SIO 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-SIO in a RS-485 application with existing (i.e. standard RS-232) software drivers.

Headers E8 (Port 1) and E10 (Port 2) are used to control the RS-485 mode functions for the driver circuit. The two selections are ‘RTS’ enable or ‘Auto’ enable. 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. If you have E3 and E9 in the RS-422 mode and wish to have the RTS signal present at the DB connector place a jumper over the RTS pins at E8 and E10. Otherwise the RTS control signal will not be present at the DB connector.

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