SeaLevel C4-104.ULTRA User manual

C4-104.ULTRA

User Manual | 3540

Contents

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

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

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

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

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

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

SPECIFICATIONS ...............................................................................................................................................17

APPENDIX A – TROUBLESHOOTING................................................................................................................18

APPENDIX B – HOW TO GET ASSISTANCE .....................................................................................................19

APPENDIX C – ELECTRICAL INTERFACE ........................................................................................................20

APPENDIX D – ASYNCHRONOUS COMMUNICATIONS ..................................................................................21

APPENDIX E – SILK SCREEN – 3540 ...............................................................................................................22

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

Introduction

The C4-104.ULTRA is the first PC/104 serial interface module to provide four software-selectable RS-

232/422/485 ports. RS-232, RS-422, or RS-485 mode may be selected independently via software

command for each of the four ports, eliminating the need for setting jumpers or DIP switches. The board is

designed using the XR16C864 UART, which provides a 128-byte FIFO, 8 times larger than boards designed

with 16C550 compatible parts. The larger buffers allow error free operation even in high-speed applications.

In RS-485 mode the C4-104.ULTRA offers automatic control of the RS-485 driver enable for trouble free

network master arbitration. Additionally, the C4-104.ULTRA allows RS-485 network termination, critical to

robust multi-drop communication, to be selectively added to the circuit via a simple software command.

The RS-232 compatibility allows for connection to devices utilizing the RS-232 electrical interface, such as

modems, data-entry terminals, and plotters.

RS-422 provides excellent communications for long distance device connections up to 4000ft., where noise

immunity and high data integrity are essential.

RS-485 is optimized for ‘Multi-Drop’ or ‘Party-line’ operations selecting data from multiple peripherals (as

many as 31 devices can be connected on an RS-485 bus). The C4-104.ULTRA is optimized for RS-485 with

automatic driver enable, and automatic suppression of RS-485 ‘Echo’ as options, further simplifying

integration.

Before You Get Started

What’s Included

The C4-104.ULTRA is shipped with the following items. If any of these items is missing or damaged,

contact the supplier.

•C4-104.ULTRA 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.

Optional Items

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

C4-104.ULTRA. All items can be purchased from our website (www.sealevel.com) or by calling our sales

team at 864-843-4343.

Cables Options

•CA228 - Terminates the C4-104.ULTRA’s 40 pin header to four DB9M connectors.

This termination provides the standard DB9 pin out for RS-232 (EIA/TIA574) in RS-

232 mode and the Sealevel Systems’ DB9 standard for RS-422/485.

•CA110/CA143 – This combination of cables also terminates the C4-104.ULTRA’s 40

pin header to four DB9M connectors. The CA110 provides a bulkhead mountable

DB37 Male connector and the CA143 provides a DB37 to 4 DB9 male connectors via

a 36 inch ‘Spider’ cable. This combination also provides the standard DB9 pin out for

RS-232 (EIA/TIA574) in RS-232 mode and the Sealevel Systems’ DB9 standard for

RS-422/485.

•CA222/TB10 – This combination of cables also terminates the C4-104.ULTRA’s 40

pin header to four DB9M connectors via a bulkhead mountable terminal block

assembly. It provides 4 DB9 male connectors that can easily be integrated into the

Sealevel Systems Relio line of embedded I/O servers. This combination also provides

the standard DB9 pin out for RS-232 (EIA/TIA574) in RS-232 mode and the Sealevel

Systems’ DB9 standard for RS-422/485.

•DB103 - The DB103 is designed to convert a Sealevel DB9 Male connector to a pinout

compatible with AC24AT and AC422AT Opto-22 ISA bus cards. This allows Optomux

devices to be controlled from any Sealevel RS-422 board with a DB9 Male connector.

•CA190 - This cable allows any Sealevel RS-422 adapter with a DB-9 to connect

directly to a Sony (or compatible) 207M "9 Pin" connector.

Card Setup

The C4-104.ULTRA contains a single 4 position DIP-Switch that provides the Address selection for the

adapter and a jumper strap which provides the IRQ selection for the adapter.

Address Selection

Each port on the C4-104.ULTRA occupies sixteen consecutive I/O locations. A DIP-switch is used to set

the base address for these locations. The following table shows the addressing options available. If

different address options are required, please contact Sealevel Systems Technical Support about a custom

PAL option.

SW1-1

SW1-2

SW1-3

Port 1

Port 2

Port 3

Port 4

OFF

300

310

320

330

OFF

400

410

420

430

OFF

500

510

520

530

OFF

600

610

620

630

OFF

1500

1510

1520

1530

OFF

3220

3230

3240

3250

4220

4230

4240

4250

Figure 1 - Address Selection Table

Refer to Appendix A for common address contentions.

Port Enable / Disable

All four ports on the can be enabled or disabled by setting the three switches in the ‘Off’ position. The port

is enabled when a valid I/O selection is made. If the adapter is disabled, be sure to disable the interrupt

request by removing the IRQ jumper.

Interrupt Modes

DIP-Switch positions ‘S’ and ‘M’ on switch SW1 selects the interrupt mode for the adapter.

With the ‘S’ selected, the adapter is in a (S)hared interrupt mode, which allows more than one adapter to

access a single IRQ. Any two or more PC-104 adapters can share a common IRQ by placing the jumpers on

the same IRQ setting and setting the appropriate selections for interrupt mode.

‘M’ indicates the inclusion of a 1K-ohm pull-down resistor required on one adapter when sharing interrupts.

Set the switch to ‘S’ for shared interrupt mode on all adapters sharing an IRQ. On one of the adapters sharing

an interrupt set the switches for both ‘S’ and for ‘M’. This provides the pull-down resistor circuit that makes

sharing IRQs possible. If you are using more than one compatible adapter in a bus you should only have

one port set to ‘M’.

Header E1 (IRQ Selection)

The C4-104.ULTRA has a single interrupt selection jumper for all four of the ports, 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.

Figure 2 - Header E1, IRQ Selection (IRQ 3 shown selected)

Clock Modes

The C4-104.ULTRA utilizes a 14.7456 MHz oscillator. This is eight times faster than the standard COM: port

oscillator, which typically is 1.8432 MHz. This allows the adapter to achieve a maximum data rate of 921.6Kbps. The

following sections outline the baud rate calculations and instructions for achieving your desired baud rate.

Baud Rates and Oscillator value

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

when using the C4-104.ULTRA. If the O/S of choice is Windows 95/98/ME/2000/NT/XP, the oscillator

value (14.7456 MHz) should be entered into the ‘Advanced Tab’ on 95/98/Me/2000/XP Device Manager

applet. Typically this is done automatically when the Sealevel Software driver is loaded.

When using Windows NT, the ‘Advanced Ports’ applet in the Control Panel should be launched and the

oscillator value entered manually in the ‘Advanced’ tab, or all data rates will be eight (8) times the selected

rate. For example if a data rate of 19.2Kbps is selected, the actual data rate will be 153.6Kbps.

When using any other OS (i.e. Linux, or QNX) the following table should be used.

For this Data Rate

Choose this Data Rate

1200 bps

150 bps

2400 bps

300 bps

4800 bps

600 bps

9600 bps

1200 bps

19.2K bps

2400 bps

3 4 5 7 9 10 11 12 15

57.6 K bps

4800 bps

115.2 K bps

14.4K bps

230.4K bps

28.8K bps

460.8K bps

57.6 K 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

768

2400 bps

384

4800 bps

192

9600 bps

19.2K bps

38.4K bps

57.6K bps

115.2K bps

230.4K bps

460.8K bps

921.6K bps

Programmable Features

Each of the ports on the C4-104.ULTRA can be individually configured as an RS-232, RS-422, or RS-485

interface. This is a software selectable feature. Electrical Interface selection (RS-232/422/485), RS-

422/485 termination, and RS-485 ‘Echo’ control are selected via the ‘Control’ port (Base + 8). If the Sealevel

Software Windows drivers are used, this is accomplished as a function of the Device Manager.

Power up default (D3-D0 = 0) = RS-485 without termination.

Control Word Written to

Base +8

Echo

422/485

Termination

Mode

Hex

RS-232

RS-422 no termination

RS-422 with termination

RS-485 no termination no echo

RS-485 no termination with echo

RS-485 with termination no echo

RS-485 with termination with

echo

Line Termination

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

end only). One of the unique features of the C4-104.ULTRA is its ability to select this termination via a

control word in the control port. It is completely software selectable, thus reducing the complexity of

cabling typically found in RS-485 implementations. Typically 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. The C4-

104.ULTRA mimics this typical termination electrically. If multiple C4-104.ULTRA adapters are configured

in an RS-485 network, only the boards on each end should have the termination in place.

RS-485 ‘Echo’

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.

An RS-485 ‘No Echo’ option is selected by writing the correct control word to the control port.

Installation

Software Installation

Windows Installation

Do not install the Adapter in the machine until the software has been fully installed.

Only users running Windows 7 or newer should utilize these instructions for accessing and

installing the appropriate driver via Sealevel’s website. If you are utilizing an operating system

prior to Windows 7, please contact Sealevel by calling 864.843.4343 or emailing

[email protected] to receive access to the proper driver download and installation

instructions.

1. Begin by locating, selecting, and installing the correct software from the website -

SeaCOM software.

2. Select the “SeaCOM for Windows” download link.

3. The setup file will automatically detect the operating environment and install the

proper components.

To confirm that the SeaCOM driver has been successfully installed, click on the ‘Start’ button, and then

select ‘All Programs’. You should see the ‘SeaCOM’ program folder listed.

You are now ready to proceed with connecting the 3540 to your system. Refer to the Hardware

Installation section for details.

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