SeaLevel ULTRA 485 Manuel utilisateur

Sealevel Systems, Inc.

155 Technology Place

P.O. Box 830

Liberty, SC 29657 USA

Phone: (864) 843-4343

FAX: (864) 843-3067

www.sealevel.com

ULTRA 485

USER MANUAL

Contents

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

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

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

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

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

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

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

INTERRUPT MODES ..............................................................................4

RS-485 ENABLE MODES.....................................................................5

CONNECTOR PIN ASSIGNMENTS...........................................................7

EIA-530..........................................................................................7

SIO-485..........................................................................................8

LINE TERMINATION..............................................................................9

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

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

For Windows Users.....................................................................10

Other Operating Systems ............................................................10

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

FEATURES..........................................................................................11

SPECIFICATIONS..................................................................... 12

ENVIRONMENTAL SPECIFICATIONS.....................................................12

MANUFACTURING..............................................................................12

POWER CONSUMPTION......................................................................12

MEAN TIME BETWEEN FAILURES (MTBF)........................................12

PHYSICAL DIMENSIONS......................................................................12

APPENDIX A -TROUBLESHOOTING....................................... 13

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

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

RS-530.............................................................................................16

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

RS-485.............................................................................................17

APPENDIX D -ASYNCHRONOUS COMMUNICATIONS ............ 18

APPENDIX E -SILK-SCREEN.................................................. 19

APPENDIX F -COMPLIANCE NOTICES ................................... 20

FEDERAL COMMUNICATIONS COMMISSION STATEMENT...................20

EMC DIRECTIVE STATEMENT ...........................................................20

WARRANTY............................................................................ 21

Figures

Figure 1 -Header E1, IRQ Selection..............................................................3

Figure 2 -Header E2, Normal IRQ Mode ......................................................4

Figure 3 -Header E2, Shared IRQ Mode.......................................................4

Figure 4 -Header E5 RS-485 Transmit Mode................................................5

Figure 5 -Header E3 RS-485 Receive Mode.................................................6

Figure 6 -DIP-shunt E4 (EIA-530 Mode).......................................................7

Figure 7 -DIP-shunt E4 (SIO-485 Mode).......................................................8

Figure 8 -SW2, Line Termination...................................................................9

Figure 9 -Asynchronous Communications Bit Diagram...............................18

Introduction

Sealevel Systems ULTRA-485 Page 1

Introduction

Overview

The Sealevel Systems ULTRA 485 provides the PC with an additional

RS-422/485 serial port for terminals, PLC communication, laboratory

instrumentation, etc.

The unique feature of the ULTRA 485 is the ability to be RS-485 compatible

without the need for special software or drivers. This is especially useful in

Windows, Windows NT, and OS/2 environments where the lower level I/O

control is abstracted from the application program. Which means that the user

can effectively use the ULTRA 485 in an RS-485 application with existing (i.e.

standard RS-232) software drivers.

What’s Included

The ULTRA 485 is shipped with the following items. If any of these items are

missing or damaged, contact the supplier.

•ULTRA 485 Serial I/O Adapter

•Serial Utility Software

•User Manual

Factory Default Settings

The ULTRA 485 factory default settings are as follows:

Port # Base Address IRQ Electrical Specification

Port 1 280 5RS-485 ‘Auto’

To install the ULTRA 485 using factory default settings, refer to Installation on

page 10.

For your reference, record installed ULTRA 485 settings below:

Port # Base Address IRQ Electrical Specification

Card Setup

Sealevel Systems ULTRA-485 Page 2

Card Setup

The ULTRA 485 contains several jumper straps that must be set for proper

operation.

Address Selection

The ULTRA 485 occupies 8 consecutive I/O locations, and looks to the PC as a

standard serial port. A DIP-switch (SW1) is used to set the port address options

for the ULTRA 485. Be careful when selecting the port addresses as some

selections may conflict with existing ports. The following table shows the

addressing options available with the standard PAL. If different address options

are required, please contact Sealevel Systems Technical Support about a

custom PAL option.

Port1 J2 SW1-1SW1-2SW1-3SW1-4

Disabled On On On On

3F8 On On On Off

2F8 On On Off On

3E8 On On Off Off

2E8 On Off On On

3220 On Off On Off

3228 On Off Off On

4220 On Off Off Off

4228 Off On On On

238 Off On On Off

300 Off On Off On

308 Off On Off Off

280 Off Off On On

288 Off Off On Off

290 Off Off Off On

298 Off Off Off Off

Note: Each COM port in the system should have a unique address. Typically

COM1: -COM4: addresses are 3F8, 2F8, 3E8 & 2E8 Hex.

Card Setup

Sealevel Systems ULTRA-485 Page 3

IRQ Selection

Header E1 selects 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.

2 3 4 5 7 10 11 12 15

Figure 1-Header E1, IRQ Selection

Any two or more ports can share a common IRQ by placing the jumpers on the

same IRQ setting at header E1 and setting the appropriate selections at E2.

Consult your particular software for IRQ selection. If no interrupt is desired,

remove the jumper.

Card Setup

Sealevel Systems ULTRA-485 Page 4

Interrupt Modes

Header E2 selects the interrupt mode for the ULTRA 485.

‘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.

Figure 2-Header E2, Normal IRQ Mode

Set the jumper to ‘S’ if you are using more than one ULTRA 485 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.

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 485 or a compatible adapter in a bus you should only have one port set

to ‘M’. The following example shows two ULTRA 485 adapters sharing a single

IRQ.

Figure 3-Header E2, Shared IRQ Mode

Card Setup

Sealevel Systems ULTRA-485 Page 5

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 485 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 485 in a RS-485 application

with existing (i.e. standard RS-232) software drivers.

Header E5 is used to control the RS-485 mode functions for the transmitter

circuit. The selections are ‘RTS’ enable, ‘Auto’ enable, or ‘422’ which means

always enabled. The ‘Auto’ enable feature automatically enables/disables the

RS-485 transmitter circuit. The ‘RTS’ mode uses the ‘RTS’ modem control

signal to enable the RS-485 transmitter circuit and provides backward

compatibility with existing software products. The ‘422’ mode allows the port

to be used in a point to point RS-422 application where the tri-stating of the

transmitter circuit is not required.

AUTO Driver automatically enabled/disabled

RTS Driver enabled by UART RTS signal

422 Driver always enabled

Note: The jumper in the above example is in the ‘422’ position. This is the only

setting in which the modem control outputs (RTS, DTR) are valid.

Figure 4-Header E5 RS-485 Transmit Mode

RTS

422

AUTO

Card Setup

Sealevel Systems ULTRA-485 Page 6

Header E3 is used to control the RS-485 enable/disable functions for the

receiver circuit. 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. The selection at E3 should follow the selection made at

E5 if ‘No Echo’ is desired. If Echo suppression is not desired then leave the

jumper in the ‘422’ position. Also note, the modem control inputs (DSR, DCD,

CTS) are only valid when Header E3 is in the 422 mode. These header blocks

are described in the illustration and table that follow.

RTS

422

AUTO

AUTO Receiver automatically enabled/disabled

RTS Receiver enabled by UART RTS signal

422 Receiver always enabled

Figure 5-Header E3 RS-485 Receive Mode

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