SeaLevel Ultra-SIO 3089 Manuale utente

Ultra-SIO

User Manual | 3089

Contents

CONTENTS...........................................................................................................................................................2

INTRODUCTION ...................................................................................................................................................3

BEFORE YOU GET STARTED ...............................................................................................................................4

CARD SETUP ........................................................................................................................................................6

INSTALLATION ..................................................................................................................................................12

TECHNICAL DESCRIPTION ...............................................................................................................................14

SPECIFICATIONS ...............................................................................................................................................15

APPENDIX A –TROUBLESHOOTING................................................................................................................16

APPENDIX B –HOW TO GET ASSISTANCE .....................................................................................................17

APPENDIX C –ELECTRICAL INTERFACE ........................................................................................................18

APPENDIX D –GROUND LOOP PHENOMENON..............................................................................................19

APPENDIX E –ASYNCHRONOUS COMMUNICATIONS ..................................................................................20

APPENDIX F –SILK-SCREEN ............................................................................................................................21

APPENDIX G –COMPLIANCE NOTICES ..........................................................................................................22

WARRANTY ........................................................................................................................................................23

Introduction

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.

Before You Get Started

What’s Included

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

contact Sealevel for replacement.

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

Advisory Conventions

Warning

The highest level of importance used to stress a condition where damage could result to the

product, or the user could suffer serious injury.

Important

The middle level of importance used to highlight information that might not seem obvious or a

situation that could cause the product to fail.

Note

The lowest level of importance used to provide background information, additional tips, or other

non-critical facts that will not affect the use of the product.

Factory Default Settings

The Ultra-SIO factory default settings are as follows:

Port #

Base Address

IRQ

Electrical Specification

Port 1

3E8

RS-422

Port 2

2E8

RS-422

To install the Ultra-SIO using factory default settings, refer to Installation.

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

Port #

Base Address

IRQ

Electrical Specification

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.

3F8

2F8

Off

3E8

Off

2E8

Off

2A0

Off

300

Off

328

Off

Disabled

Off

Figure 1 - Address Selection Table

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.

Card Setup, Continued

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.

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.

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.

Card Setup, Continued

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.

N S M

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.

N S M

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.

N S M

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

Card Setup, Continued

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.

Headers E3 (Port 1) and E9 (Port 2) are 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. These header blocks are described in the illustration

and table that follow:

Echo No

Echo 422 485

E3 = Port 1

E9 = Port 2

Card Setup, Continued

Position 1 ‘Echo’

Echoes the data that is transmitted.

All characters transmitted are

received. (Only relevant in the two

wire RS-485 Mode)

Position 2 ‘No Echo’

Inhibits the data that has been

transmitted. Receiver is off when

transmitter is on. (Only relevant in

the two wire RS-485 Mode)

Position 3 ‘422’

RS-422/485 Driver always enabled

(RS-422 Mode). RTS modem control

signal available on DB-9 connector.

Position 4 ‘485’

RS-422/485 Driver enabled by RTS,

or ‘Auto’ enabled. Modem control

signal not available on DB-9

connector.

Interface Mode Examples

RTS

Auto

E8 & E10 E3 & E9

Figure 6 - RS-422

RTS

Auto

E8 & E10 E3 & E9

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

RTS

Auto

E8 & E10 E3 & E9

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

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