SeaLevel ULTRA COMM+422 User manual

COMM+422™

USER’S MANUAL

Part Number 3067

Sealevel Systems, Inc Phone: (864) 843-4343

155 Technology Place Fax: (864) 843-3067

P.O. Box 830 www.sealevel.com

Liberty, SC 29657

Contents

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

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

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

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

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

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

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

RS-485 ENABLE.................................................................................4

INSTALLATION.......................................................................... 5

OPERATING SYSTEM INSTALLATION....................................................5

TECHNICAL DESCRIPTION ....................................................... 6

FEATURES ...........................................................................................6

CONNECTOR PIN ASSIGNMENTS...........................................................6

MODEM CONTROL SIGNAL CONSIDERATIONS......................................6

SPECIFICATIONS....................................................................... 7

ENVIRONMENTAL SPECIFICATIONS......................................................7

POWER CONSUMPTION........................................................................7

MEAN TIME BETWEEN FAILURES (MTBF)..........................................7

PHYSICAL DIMENSIONS.......................................................................7

APPENDIX A -TROUBLESHOOTING......................................... 8

APPENDIX B -HOW TO GET ASSISTANCE............................. 10

APPENDIX C -ELECTRICAL INTERFACE................................ 11

RS-422............................................................................................11

RS-485............................................................................................11

APPENDIX D -ASYNCHRONOUS COMMUNICATIONS ............ 12

APPENDIX E -SILK-SCREEN.................................................. 13

APPENDIX F -SCHEMATIC..................................................... 14

WARRANTY............................................................................ 16

Figures

Figure 1 -Address Selection Table..................................................................2

Figure 2 -DIP-Switch Illustration.....................................................................2

Figure 3 -Port to Connector Table...................................................................3

Figure 4 -Header E1.........................................................................................3

Figure 5 -Header E2.........................................................................................4

Figure 6 -Connector Pin Assignments.............................................................6

Figure 7 -Asynchronous Communications Bit Diagram...............................12

Introduction

Sealevel Systems COMM+422 Page 1

Introduction

Overview

The Sealevel Systems COMM+422 provides the PC with four

RS-422/485 asynchronous communication ports. The COMM+422

allows for connection to any device utilizing the RS-422/485 electrical

interface, such as modems, data-entry terminals, and programmable logic

controllers.

What’s Included

The COMM+422 is shipped with the following items. If any of these

items are missing or damaged, contact the supplier.

•(1) COMM+422 serial interface adapter card

•(1) DB-9 cable assembly

•(1) 3.5” Serial Utility Diskette

•User manual

Factory Default Settings

TheCOMM+422 factory default settings are as follows:

Base Address IRQ

Port 1 2E0 3

Port 2 2E8 3

Port 3 2EF 3

Port 4 2F8 3

To install the COMM+422 using factory default settings, refer to

Installation on page 5.

For your reference, record installed COMM+422 settings below:

Base Address IRQ

Port 1

Port 2

Port 3

Port 4

Card Setup

Sealevel Systems COMM+422 Page 2

Card Setup

The COMM+422 contains several jumper straps for each port which must

be set for proper operation.

Address Selection

The COMM+422 occupies 32 consecutive I/O locations. The 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 PC

ports. The following table shows several examples that usually do not

cause a conflict.

Address Switch Settings

12345

280-29F Off On Off On On

2A0-2BF Off On Off On Off

380-39F Off Off Off On On

1A0-1BF On Off Off On Off

2E0-2FF Off On Off Off Off

Figure 1-Address Selection Table

Refer to Appendix A for common address contentions. The 2E0-2FF

setting in conjunction with an IRQ3 interrupt selection will let the PC

recognize COM2:(2F8) and COM4:(2E8).

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 2E0 is selected as a base. Address 2E0 in binary

is XX 10 111X XXXX where X = a non-selectable address bit.

1 2 3 4 5

Figure 2-DIP-Switch Illustration

Card Setup

Sealevel Systems COMM+422 Page 3

Port # Connector

Location

Address Example

(Base=280)

1J1 Base+0 280-287

2J2 Base+8 288-28F

3J3 Base+16 290-297

4J4 Base+24 298-29F

Figure 3-Port to Connector Table

IRQ Selection

The COMM+422 has an interrupt selection jumper which should be set

prior to use if an interrupt is required by your application software.

Consult the user manual for the application software being used to

determine the proper setting. The four interrupts are OR'ed together to

form a single interrupt request (IRQ). This signal is converted to open

collector active high pull-up allowing multiple COMM+422 adapters to

share the same IRQ line. The IRQ can be set at jumper E1 for IRQ 2/9, 3,

4, or 5. In the following example, the IRQ is set as IRQ3.

2/9

Figure 4-Header E1, IRQ Selection shown. (IRQ3 Selected )

Note: The actual silk-screen for the COMM+422 may have a “2” in place

of the IRQ “2/9” selection.

Card Setup

Sealevel Systems COMM+422 Page 4

RS-485 Enable

Header E2 selects whether the RS-485 driver is enabled by the UART

signal Request To Send (RTS) or is always enabled. With the jumper

installed, RTS enables the driver. Removing the jumper enables the driver

regardless of RTS. These jumpers should only be installed if you are

running the board in a multi-drop polled environment such as RS-485.

For normal point to point RS-422 (such as terminal emulation), remove

these jumpers.

1234

Figure 5-Header E2 (RTS enable)

Note: Each port on the COMM+422 can be independently selected as RS-

422 or RS-485. The number below Header E2 represents the port

number (i.e. 1 = Base address, 2 = Base+8 etc.) that is effected

when the jumper is installed. In the above example all ports are set

to “Driver permanently enabled”. This is the default for Header

E2.

Installation

Sealevel Systems COMM+422 Page 5

Installation

The COMM+422 can be installed in any of the PC expansion slots. The

COMM+422 contains several jumper straps for each port which 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 slot and remove the blank metal slot cover.

4. Gently insert the COMM+422 into the slot. Make sure that the

adapter is seated properly.

5. Install the COMM+422 in a slot, and then install the extra two port

cable bracket in the slot toward the power supply from the board.

6. Replace the cover.

7. Connect the power cord.

Installation is complete.

Operating System Installation

For Windows Users

Start by choosing Install Software at the beginning of the CD.

Choose Asynchronous COM: Port Software, SeaCOM.

Other Operating Systems

Refer to the appropriate section of the Serial Utilities Software.

Technical Description

Sealevel Systems COMM+422 Page 6

Technical Description

The COMM+422 provides four RS-422/485 serial ports, each utilizing a

16550 UART. This chip features programmable baud rate, data format,

interrupt control and a 16 byte input and output FIFO. TheCOMM+422 is

configured as four consecutively addressed UARTs with full RS-422/485

signal drivers and receivers.

Features

•Four RS-422/485 ports

•Selectable interrupts (IRQs) 2/9, 3, 4, 5

•Multiple cards or ports can share the same IRQ

•16550 UART standard

Connector Pin Assignments

Signal Name Pin # Mode

GND Ground 5

TX + Transmit Data Positive 4Output

TX-Transmit Data Negative 3Output

RTS+ Request To Send Positive 6Output

RTS-Request To Send Negative 7Output

RX+ Receive Data Positive 1Input

RX-Receive Data Negative 2Input

CTS+ Clear To Send Positive 9Input

CTS-Clear To Send Negative 8Input

Figure 6-Connector Pin Assignments

Modem Control Signal Considerations

Some software packages require the use of the modem handshake signals.

The COMM+422 provides modem control signals Request ToSend (RTS)

and Clear To Send (CTS). The signal CTS is biased via a resistor network

to a “True” or “On” state when left disconnected. All other modem

control signals associated with the UART are tied to the “True” or “On”

state. This configuration will typically satisfy the modem control signal

requirements for most communications software.

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