SeaLevel ISO COMM2.cPCI Manuel utilisateur

ISO COMM2.cPCI™

User Manual | 7903

Contents

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

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

CARD SETUP ........................................................................................................................................................5

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

TECHNICAL DESCRIPTION ...............................................................................................................................10

SPECIFICATIONS ...............................................................................................................................................11

APPENDIX A – TROUBLESHOOTING................................................................................................................12

APPENDIX B – HOW TO GET ASSISTANCE .....................................................................................................13

APPENDIX C – ELECTRICAL INTERFACE ........................................................................................................14

APPENDIX D – GROUND LOOP PHENOMENON..............................................................................................16

APPENDIX E – ASYNCHRONOUS COMMUNICATIONS ..................................................................................17

APPENDIX F – SILK SCREEN ............................................................................................................................18

APPENDIX G – COMPLIANCE NOTICES ..........................................................................................................19

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

Introduction

The Sealevel Systems ISO COMM+2.cPCI is a two channel isolated cPCI Bus serial I/O adapter. Utilizing

the Exar 16C850 UART with its industry leading 128 byte FIFOs, it provides two field selectable

RS232/422/485 serial ports supporting data rates up to 460.8K bps (RS-422/485).

Configure both ports as RS232 for standard serial COM: port requirements. Choose the RS-422 mode for

long distance device connections up to 5000ft. 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. Optional

Terminal Block adapters are available to simplify field-wiring connections.

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.

Before You Get Started

What’s Included

The ISO COMM+2.cPCI is shipped with the following items. If any of these items are missing or damaged,

please contact Sealevel for replacement.

•ISO COMM+2.cPCI Serial I/O Adapter

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.

Card Setup

Electrical Interface Selection

Each port on the ISO COMM+2.cPCI has the ability to be used as RS-232, RS-422 or RS-485. This is

selectable via two DIP-switches, SW1 & SW2. Please use the following examples to configure your

adapter.

Figure 1- RS-232

Figure 2 - RS-422

Figure 3 - RS-485, 4-Wire with Echo

Figure 4 - RS-485 2-Wire with Echo

Figure 5 - RS-485, 2-wire without Echo

1234567

OFF

8910

1 2 3 T P P L L E

RS-232

1 2 3 4 5 6 7

OFF

8 9 10

1 2 3 T P P L L E

RS-422

1 2 3 4 5 6 7

OFF

8 9 10

1 2 3 T P P L L E

4-Wire

RS-485

W/Echo

1 2 3 4 5 6 7

OFF

8 9 10

1 2 3 T P P L L E

2-Wire

RS-485

W/Echo

1 2 34 5 6 7

OFF

8 9 10

1 2 3 T P P L L E

2-Wire

RS-485

NO Echo

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. Switches SW1 and SW2 allow the user to

customize this interface to their specific requirements. Each switch position corresponds to a specific

portion of the interface. If multiple ISO COMM+2.cPCI 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

T Adds or removes the 120 ohm termination.

Adds or removes the 1K ohm pull-down resistor in the RS-422/RS-

485 receiver circuit (Receive data only).

Adds or removes the 1K ohm pull-up resistor in the RS-422/RS-

485 receiver circuit (Receive data only).

L Connects the TX+ to RX+ for RS-485 two wire operation.

L Connects the TX- to RX- for RS-485 two wire operation.

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 ISO COMM+2.cPCI is the ability to be RS-485 compatible without the

need for special software or drivers. This ability is especially useful in Operating Systems where the lower

level I/O control is abstracted from the application program. This ability means that the user can

effectively use the ISO COMM+2.cPCI in an RS-485 application with existing (i.e. standard RS-232)

software drivers.

Switches SW3 and SW4 are used to control the RS-485 mode functions for the driver circuit. The

selections are ‘RTS’ enable (silk-screen ‘RT’ switch position 4) or ‘Auto’ enable (silk-screen ‘AT’ switch

position 3). 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.

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. Position 9 of SW1 and SW2 is used to control the RS-485 enable/disable functions for the receiver

circuit. To select the ‘No Echo’ mode place switch position 9 to the ‘On’ position (see Figure 5).

Figure 6 - RS-485 Enable modes

Clock Modes

The ISO COMM+2.cPCI employs a unique clocking option that allows the end user to select from divide

by 4 and divide by 1 clocking modes. These modes are selected at switches SW3 & SW4.

To select the Baud rates commonly associated with COM: ports (i.e. 2400, 4800, 9600, 19.2, … 115.2K

Bps) set switch position 2 to the ‘On’ position (silk-screen D4). To select the maximum data rate (460.8K

bps) set switch position 1 to the ‘On’ position (silk-screen D1).

Figure 7 - Clocking Modes

1 2 3 4

OFF

1 2 3 4

OFF

SW3

SW4

RS-232/422

Default

1234

OFF

1234

OFF

SW3

SW4

RS-485

Auto

Enabled

1234

OFF

1234

OFF

SW3

SW4

Divide by

1 mode

Divide by

4 mode

Baud Rates and Divisors for the ‘Div1’ Mode

The following table shows some common data rates and the rates you should choose to match them if

using the adapter in the ‘Div1’ mode.

For this Data Rate

Choose this Data Rate

1200 bps

300 bps

2400 bps 600 bps

4800 bps 1200 bps

9600 bps 2400 bps

19.2K bps 4800 bps

57.6 K bps 14.4K bps

115.2 K bps 28.8K bps

230.4K bps 57.6K bps

460.8K bps 115.2K bps

If your communications package allows the use of Baud rate divisors, choose the appropriate divisor

from the following table:

For this Data Rate

Choose this Divisor

1200 bps

384

2400 bps

192

4800 bps 96

9600 bps 48

19.2K bps 24

38.4K bps 12

57.6K bps 8

115.2K bps 4

230.4K bps 2

460.8K bps

Installation

Operating System Installation

For Windows Users

Begin by locating, selecting and installing the correct software from the Sealevel software driver database.

Other Operating Systems

Refer to the appropriate section of the Serial Utilities Software.

System Installation

The ISO COMM+2.cPCI can be installed in any of the PCI expansion slots and contains several jumper

straps for each port that must be set for proper operation.

1. Turn off PC power. Disconnect the power cord.

2. Remove the PC case cover.

3. Locate an available PCI slot and remove the blank metal slot cover.

4. Gently insert the ISO COMM+2.cPCI into the slot. Make sure that the adapter is seated properly.

5. Replace the screw.

6. Replace the cover.

7. Connect the power cord.

Installation is complete.

Technical Description

The Sealevel Systems ISO COMM+2.cPCI provides a cPCI interface adapter with 2 isolated asynchronous

serial ports providing a versatile interface, field selectable as RS-232 for modems, printers and plotters, as

well as RS-422/485 for industrial automation and control applications. 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 destruction of communications interfaces.

The ISO COMM+2.cPCI utilizes the 16C850 UART. This chip features programmable baud rates, data

format, interrupt control and industry leading 128-byte FIFOs.

Connector Pin Assignments

RS-232

Name Pin # Mode

TD Transmit Data 3 Output

RTS Request To Send

Output

GND Ground 5

RD Receive Data 2 Input

CTS Clear To Send 8 Input

These assignments meet EIA/TIA/ANSI-574 DTE for DB-9 type connectors.

RS-422/485

Signal Name Pin # Mode

GND

Ground

TX +

Transmit Data Positive

Output

TX- Transmit Data Negative 3 Output

RTS+ Request To Send Positive 6 Output

RTS- Request To Send Negative 7 Output

RX+ Receive Data Positive 1 Input

RX-

Receive Data Negative

Input

CTS+

Clear To Send Positive

Input

CTS- Clear To Send Negative 8 Input

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