SeaLevel Ultra COMM+2.PCIe 7205ec User manual

Ultra COMM+2.PCIe

User Manual | 7205ec & 7205ecS

Contents

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

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

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

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

HARDWARE INSTALLATION .............................................................................................................................15

TECHNICAL DESCRIPTION ...............................................................................................................................17

TECHNICAL SPECIFICATIONS..........................................................................................................................19

APPENDIX A –TROUBLESHOOTING................................................................................................................20

APPENDIX B –HANDLING INSTRUCTIONS.....................................................................................................25

APPENDIX C –ELECTRICAL INTERFACE ........................................................................................................26

APPENDIX D –ASYNCHRONOUS COMMUNICATIONS ..................................................................................28

APPENDIX E –GROUND LOOP PHENOMENON ..............................................................................................29

APPENDIX F –MECHANICAL DRAWING .........................................................................................................30

WARRANTY ........................................................................................................................................................31

REGULATORY.....................................................................................................................................................32

Introduction

The Sealevel Ultra COMM+2.PCIe (Item# 7205ec) is a PCI Express 2.0 Gen 1 compliant interface adapter

with two field selectable RS-232/422/485 asynchronous serial ports supporting data rates exceeding

1 Mbps for industrial automation and control applications.

Configure the serial ports as RS-232 for standard serial COM port requirements. Choose the

RS-422 mode for long distance device connections up to 4000ft. where noise immunity and high data

integrity are essential. Select RS-485 and capture data from multiple peripherals in an RS-485 multi-drop

network. Up to 31 RS-485 compliant devices can be connected to each port to automate your data

collection. You can even mix the ports in any of the electrical interface combinations to provide maximum

flexibility in your application.

Under Windows, in RS-485 mode the transmitter is automatically enabled in hardware, eliminating the need

for application software control. This allows the 7205ec to be used with standard serial communications

applications and removes the risk of bus contention and data corruption. In RS-232 mode, all modem

control signals are implemented for maximum compatibility with a wide range of serial peripherals. The

Sealevel SeaCOM for Windows software driver and utilities make installation and operation easy in

Windows 7/8.1/10.

The Ultra COMM+2.PCIe ships with a Low Profile PCIe bracket that will only work in a Low Profile PCIe slot.

If you need a standard size PCIe bracket, please order Item# 7205ecS. The product is RoHS compliant and

meets the requirements of RoHS (2011/65/EU) directive.

Features

•Two serial ports configurable for RS-232/422/485

•On board DIP switch configuration with Windows device driver override

•Ultra High-speed UART with 256-byte TX and RX FIFOs

•Asynchronous data rates exceeding 1 Mbps

•Automatic RS-485 enable/disable for Windows applications

•Windows driver selectable 250K slew rate limiting, to minimize electromagnetic interference

•Includes 36” cable that terminates to two DB9M connectors

Before You Get Started

What’s Included

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

please contact Sealevel for replacement.

•Ultra COMM+2.PCIe Adapter

•CA203 –DB25F to (2) DB9M Cable, 36”in Length

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.

Optional Items

Depending upon your application, you are likely to find one or more of the following items useful with the

7205ec. All items can be purchased from our website (www.sealevel.com)by calling our sales team at

(864) 843-4343.

DB9 to DB25 Serial Cable (Part Number CA177)

The CA177 is a standard AT-style RS-232 modem cable with a DB9 female connector

on one end and a DB25 male connector on the other end. Simply connect the DB-9F

connector to the DB9 serial port on your computer or host, and then connect the DB-

25M connector to your RS-232 serial modem or other compatible RS-232 serial

device. The six foot cable is fully shielded with dual thumbscrews at each connector.

The molded connectors integrate strain relief to prevent damage to the cable or

connectors. All DB9 modem control signals are implemented, and the cable is pinned

to EIA-232 standards.

DB9 Serial Extension Cable (Part Number CA127)

The CA127 is a standard DB9F to DB9M serial extension cable. Extend a DB9 cable

or locate a piece of hardware where it is needed with this six foot (72 inch) cable. The

connectors are pinned one-to-one, so the cable is compatible with any device or cable

with DB9 connectors. The cable is fully shielded against interference and the

connectors are molded to provide strain relief. Dual metal thumbscrews secure the

cable connections and prevent accidental disconnection.

RS-422 to RS-530 Cable (Part Number CA176)

DB9 Female (RS-422) to DB25 Male (RS-530) Cable, 10 inch Length. Convert any

Sealevel RS-422 DB9 Male Async Adapter to an RS-530 DB25 Male pinout. Useful in

situations where RS-530 cabling exists, and a multiport Sealevel RS-422 adapter is

to be used.

Terminal Block

Terminal Block Kit - (Part Number KT105)

The KT105 terminal block kit breaks out a DB9 connector to 9 screw terminals to simplify

field wiring of serial connections. It is ideal for RS-422 and RS-485 networks, yet it will

work with any DB9 serial connection, including RS-232. The KT105 includes one DB9

terminal block (part number TB05) and one CA127 extension cable. The TB05 includes

holes for board or panel mounting. The TB05 is designed to connect directly to Sealevel

DB9 serial cards or any cable with a DB9M connector.

Card Setup

Address and IRQ Selection

The 7205ec is automatically assigned memory addresses and IRQs by your motherboard BIOS or by a “Plug-

n-Play” Operating System. Adding or removing other hardware or moving the adapter to another slot may

change the assignment of memory addresses and IRQs.

Clock Modes and Baud Rates

The 7205ec derives a 125MHz clock from the PCI express link for the Baud Rate Generator (BRG) which is

divided by a clock prescaler (1 or 4) and a 16-bit clock divisor to obtain a sampling clock of 16X, 8X, or 4X

the serial data rate. The BRG offers a wide range of possible baud rates. Under Windows and Linux, the

best choice of divisor is made automatically by the driver. The bit rate error is within the +/–2%

recommended tolerance for proper serial communication.

Electrical Interface Selection via Hardware

Each serial port on the 7205ec has the ability to be used as RS-232, RS-422, or RS-485. Port 1 is selectable

via DIP-switch SW2 configuration, and Port 2 is selectable via DIP-switch SW1 configuration. Please use

the following examples to configure your adapter.

Mode selection via hardware (DIP switches)

M1 Switch

M0 Switch

Mode

OFF

RS-232

OFF

RS-422 (Default)

OFF

RS-485 with Echo

RS-485 without Echo

RS-485 Enable Modes

RS-485 is ideal for multi-drop or network environments like that used by SeaI/O modules. RS-485 requires

a tristate driver that will allow the electrical presence of the driver to be removed from the line. The driver

is in a tristate 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 RS-485 driver of each port enters and leaves tristate together with

the changes to its output modem control signal Request to Send (RTS). Under Windows, configuring the

port for RS-485 also configures the port to automatically assert its RTS output at the start of each

transmission. This causes the RS-485 data transmission driver to leave tristate allowing it to transmit

signals. In RS-485 mode under Windows the port is also set to automatically de-assert its RTS at the end

of each transmission. This returns the RS-485 data transmission driver to tristate so that other drivers can

transmit on the line.

Line Termination Selection via Hardware

Typically, the device at each end of the RS-485 bus must have line-terminating resistors (RS-422 terminates

at the receive end only). When the end device is a 7205ec port, the board DIP switches can be used to

connect a built in 120-ohm resistor between each RS-422/485 input pair in addition to a 510-ohm pull-

up/pull-down combination that biases the RX+ and RX–receiver inputs. DIP switches SW2 (Port 1) and

SW1 (Port 2) allow the user to customize each port individually to their specific requirements.

If multiple 7205ec ports are configured in a RS-485 network, only the ports at each end should have

switches T, PU, and PD ON.

If using the board in an RS-485 two-wire network, enable the two switches labeled ‘L’, which electrically

connect the TX–and RX–pins together and the TX+ and RX+ pins together.

M1 Switch

Default

Selection if ON

Enables RS-422/RS-485 120 ohm termination between RX+

and RX–and between CTS+ and CTS–

Enables RS-422/RS-485 RX+ 510 ohm pull-up to 3.3V (biasing)

Enables RS-422/RS-485RX–510 ohm pull-down to GND (biasing)

OFF

Enables RS-485 two-wire mode, connecting TX–to RX–

OFF

Enables RS-485 two-wire mode, connecting TX+ to RX+

Electrical Interface, Line Termination, and Echo Selection via Software

When a 7205ec has been installed under Windows, the DIP switch configuration can be overridden by

software settings via the Port Settings tab in Device Manager. Changing one port to be overridden by

software will automatically change the other port to also be software overridden. The initial software

override configuration of each port is adopted from its DIP switch configuration. Both COM ports of the

7205ec should be closed by applications when the software override option is changed in Port Settings.

The Port Manager application in the SeaCOM suite of communication utilities is used to set the Interface

Mode and Options for the Serial Ports of the computer. The COM Port(s) to be configured must be closed

in other applications that control them before the Port Manager utility can configure them. Likewise, other

applications cannot open the COM Ports while they are open in the SeaCOM Port Manager.

The Port Manager utility will open with the COM Ports listed on the left-side of the window and COM1

configuration in the right-side window. COM 1 is an internal serial port that is not accessible externally to

the computer. The external Serial Ports available on the R1 SeaI/O Controller are COM3 and COM4.

Initial Start screen for Port Manager

COM Port Configuration

The right-side window of the Port Manager is the configuration box. The COM Port to be configured is

selected by clicking on the desired COM Port box in the left side window. This will display the current COM

Port Electrical Interface settings. The first time the Port Manager is used the configuration will be RS-232,

and all other boxes unchecked, and RS-485 Auto-Enable set to 0. The settings are stored when applied and

will be display on subsequent uses of the Port Manager.

The changed settings will be activated when the Apply button at the bottom of the configuration box is

clicked. This also closes the port allowing other application to open it.

COM3 Configuration Example

In the Electrical Interface section, the Interface Mode box is used to set the protocol for COM Port selected.

The choices are:

Tri-State No external signal communication

RS-232 Single ended signaling, point-to-point serial communication mode

RS-422 Differential, twisted pair, point-to-point serial communication mode

RS-485 Differential, twisted pair, multidrop serial communication mode

Electrical Interface Section

RS-485 Enable Modes

RS-485 is ideal for multi-drop or network environments like that used by SeaI/O modules. RS-485 requires

a tristate driver that will allow the electrical presence of the driver to be removed from the line when not

transmitting data. The driver is in a tristate or high impedance condition when this occurs. Only one driver

may be active at a time on a bus and the other driver(s) must be tri-stated. Under Windows, configuring the

port for RS-485 also configures the port to automatically control the transmit enable of the transceiver, its

RTS output, at the start of each transmission. This causes the RS-485 data transmission driver to leave

tristate allowing it to transmit data. In RS-485 mode under Windows the port is also set to automatically

de-assert its output on the bus at the end of each transmission. This returns the RS-485 data transmission

driver to tristate so that other drivers can transmit on the line. This also returns RTS signal to its initial state.

Slew Rate Limiting

Slew Rate Limiting (250kbps) is an additional configuration setting available only via software selection. It

helps minimize the generation of electromagnetic interference in applications by slowing the rise and fall

times of the data transitions where higher baud rates are not required. This can be used for any baud rates

250kbps or lower.

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