SeaLevel ISO-COMM Manuel utilisateur

ISO-COMM

User Manual | 3415, 3416, 3417, 3418, 3419

Contents

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

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

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

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

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

TECHNICAL DESCRIPTION..............................................................................................................................................................................................13

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

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

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

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

APPENDIX D –ASYNCHRONOUS COMMUNICATIONS.............................................................................................................................................19

APPENDIX E –SILK SCREEN ..........................................................................................................................................................................................20

APPENDIX D –COMPLIANCE NOTICES........................................................................................................................................................................22

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

Introduction

Overview

The Sealevel Systems ISO-COMM provides the PC with additional ground isolated 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 phenomena that leads to the failure (and destruction) of communication

interfaces. The ISO-COMM isolated boards provide up to 500 volts DC of isolation.

The ISO-COMM provides two or four DOS and Windows compatible serial ports, and also offers extended

‘AT’ interrupts. Each port is independently addressable as COM1: through COM4:, or any other I/O address

up to 3FF Hex.

Before You Get Started

What’s Included

The ISO-COMM is shipped with the following items. If any of these items are missing or damaged,

contact the supplier.

•ISO-COMM Serial I/O Adapter

•Cable providing 2 DB-9 connectors.

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.

Before We Get Started, Continued

Factory Default Settings

The ISO-COMM factory default settings are as follows:

Port #

Base Address

IRQ

Port 1

3F8

Port 2

2F8

Port 3

3E8

Port 4

2E8

For your reference, record installed ISO-COMM settings below:

Port #

Base Address

IRQ

Port 1

Port 2

Port 3

Port 4

Card Setup

The ISO-COMM contains several jumper straps which must be set for proper operation.

Address Selection

Each port on the ISO-COMM occupies 8 consecutive I/O locations. A DIP-switch is used to set the base

address for these locations. Be careful when selecting the base address as some selections conflict with

existing ports. The following table shows several examples that typically do not cause a conflict. SW4 sets

the I/O address for port 1, SW3 sets the address for port 2, SW2 sets the address for port 3 and SW1 sets

the address for port 4.

Address

Binary

Switch Position Setting

Hex

A9 A0

280-287

1010000XXX

Off

2A0-2A7

1010100XXX

Off

2E8-2EF

1011101XXX

Off

2F8-2FF

1011111XXX

Off

3E8-3EF

1111101XXX

Off

300-307

1100000XXX

Off

328-32F

1100101XXX

Off

3F8-3FF

1111111XXX

Off

Figure 1 - Address Selection Table

The following illustration shows the correlation between the DIP-switch setting and the address bits used

to determine the base address. In the example below, address 300 is selected as a base. Address 300 in

binary is XX11 0000 0XXX where X = a non-selectable address bit.

A9 A3E

Figure 2 - DIP Switch Illustration

Setting the switch ‘On’ or ‘Closed’ corresponds to a ‘0’ in the address, while leaving it ‘Off’ or ‘Open’

corresponds to a ‘1’.

Refer to Appendix A for common address contentions.

OFF

Card Setup, Continued

Port Enable / Disable

Each port on the ISO-COMM can be enabled or disabled with switch position 8 on the DIP-switch. The port

is enabled with the switch ‘On’ or ‘Closed’ and disabled when ‘Off’ or ‘Open’. If any port is disabled, be sure

to disable the interrupt request for that port by removing the IRQ jumper.

IRQ Selection

Headers E1, E2, E3 and E4 select the IRQ for each serial port. If COM1: is selected, this jumper must be on

the IRQ4 setting. If COM2: is selected, this jumper must be on IRQ3.

E4 - Port1

E3 - Port2

E2 - Port3

E1 - Port4

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.

Interrupt Mode Options

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

proper installation.

‘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 E5. 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 3 - Headers E1, E2, E3, and E4 (Factory Default)

Card Setup, Continued

1 2

3 4

Figure 4 - Header E5, Normal IRQ Mode

Set 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 of IRQs possible. If you are using

more than one ISO-COMM or a compatible card in a bus you should only have one port set to ‘M’. The

following example shows all four ports sharing a single IRQ.

1 2

3 4

Figure 5 - Header E5, Shared IRQ Mode

Set jumper to ‘S’ if you are using more than one ISO-COMM in a bus or wish to completely remove the pull-

down resistor for hardware compatibility.

Card Setup, Continued

Setting the board in this configuration when it is not accompanied by a pulldown resistor will prevent the

ports from triggering an interrupt.

1 2

3 4

Figure 6 - Header E5, Sharing IRQs with another adapter

E4 - Port1

1 2 M

SE3 - Port2

3 4E2 - Port3

E1 - Port4

Figure 7 - IRQ Headers E1 - E5 (Factory Default)

Card Setup, Continued

The above example shows the correlation between jumper block E5 and the interrupt jumpers (E1-E4). This

example shows the ISO-COMM shipping configuration with COM1: & COM3: sharing interrupt 4 and COM2:

& COM4: sharing interrupt 3.

Headers E8 and E9

RS-485 is backwardly compatible with RS-422, however it is optimized for party line or multi-drop

applications. The output of the RS-422/485 driver is capable of being active (enabled) or tri-state (disabled).

This capability allows multiple PCs to be connected in a multi-drop bus and selectively polled. Half duplex

two-wire operation is also possible by connecting TX+ to RX+ and TX- to RX- in your cable hood. The enable

to the driver is connected to the UART Request To Send (RTS) line for RS-485 communications. This allows

the RS485 driver to be tri-stated when inactive on a multi-drop polled network. The software that you are

using must "know how" to enable the driver when it is answering a poll. Failure to correctly set this jumper

can cause transmitter contention problems preventing operation by any nodes on the network. Sealevel

Systems communication software is compatible with this mode of operation. To enable the driver with RTS

install jumpers at E9-A for port 1, E9-C for port 2, E8-A for port 3 and E8-C for port 4.

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 the ‘echoing’

(i.e., using received characters to throttle the transmitter) or it can confuse the system if the software does

not. The RS-485 echo can also be disabled at E8 and E9. To disable the echo, install a jumper at E9-B for

port 1, E9-D for port 2, E8-B for port 3 and E8-D for port 4.

The following example shows the driver in the RS-485 mode and the echo enabled.

E8 & E9D

C B

Figure 8 - Headers E8 and E9 RS-485 Mode Enable

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