SeaLevel 3547 User manual

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© Sealevel Systems, Inc. 3547 Manual | SL9192 7/2021
C4-104.485+1
User Manual | 3547

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© Sealevel Systems, Inc. 3547 Manual | SL9192 7/2021
Contents
CONTENTS...........................................................................................................................................................2
INTRODUCTION ...................................................................................................................................................3
BEFORE YOU GET STARTED ...............................................................................................................................4
CARD SETUP ........................................................................................................................................................8
INSTALLATION & CONFIGURATION.................................................................................................................14
HARDWARE INSTALLATION .............................................................................................................................16
ELECTRICAL SPECIFICATIONS.........................................................................................................................19
TECHNICAL SPECIFICATIONS..........................................................................................................................21
APPENDIX A –TROUBLESHOOTING................................................................................................................22
APPENDIX B –HOW TO GET ASSISTANCE .....................................................................................................23
APPENDIX C –ELECTRICAL INTERFACE ........................................................................................................24
APPENDIX D –ASYNCHRONOUS COMMUNICATIONS ..................................................................................25
APPENDIX E –SILK-SCREEN - 3547.................................................................................................................26
APPENDIX F –COMPLIANCE NOTICES...........................................................................................................27
WARRANTY ........................................................................................................................................................28

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© Sealevel Systems, Inc. 3547 Manual | SL9192 7/2021
Introduction
The 3547 PC/104 serial interface provides four serial ports with 1,500VDC port-to-port isolation that protect
the host system from ground loops and voltage transients that are common in remote installations and
industrial environments.
For maximum versatility without opening the PC/104 stack, each port is software configurable for full-
duplex (4-Wire) RS-422 or RS-485. Half duplex (2-Wire) RS-485 mode is also supported. The ‘auto-enable’
circuit automatically handles the RS-485 driver, which eliminates the risk of bus contention and data
corruption. With the driver controlled in hardware, the RS-485 ports are treated as standard serial COM
ports by the operating system.
Features
•1,500VDC port-to-port isolation
•Each port is software configurable for 4-wire RS-422/485 or 2-wire RS-485
•16954 buffered UART with 128-byte FIFOs
•Automatic hardware RS-485 enable/disable
•UART support for 9-bit protocol
•Data rates to 921.6K bps
•Jumpers on each port for suppressing ECHO
•Four 10-pin vertical header connectors
•Extended temperature range available (-40°C - +85°C)

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© Sealevel Systems, Inc. 3547 Manual | SL9192 7/2021
Before You Get Started
What’s Included
The 3547 is shipped with the following items. If any of these items are missing or damaged, please contact
Sealevel for replacement.
•C4-104.485+1 (Item# 3547) –PC/104 RS-422, RS-485 (Software Selectable) Isolated Serial
Interface
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.

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© Sealevel Systems, Inc. 3547 Manual | SL9192 7/2021
Optional Items
Depending upon your application, you are likely to find one or more of the following items useful with the
3547. All items can be purchased from our website (www.sealevel.com) or by calling our sales team at
864-843-4343.
Cables
10-Pin IDC Ribbon Cable to DB9M (Item# CA152)
The CA152 allows connects to the 10-pin header on
PC/104 boards and provides a DB9M connector that can
be panel mounted in an enclosure. This cable is eight
inches in length.
DB9F to DB9M Extension Cable (Item# CA127)
The CA127 allows users to extend a DB9 cable up to six
feet. The connectors are pinned one-to-one, so the cable
is compatible with any device or cable with DB9
connectors.
DB9F (RS-422) to DB25M (RS-530) Cable (Item# CA176)
The CA176 allows users to convert any Sealevel RS-422
DB9 Male asynchronous adapter to an RS-530 DB25
Male pinout. This cable is ten inches in length.
DB9F to DB9F –207M SMPTE Cable (Item# CA190)
The CA190 connects any Sealevel DB9 RS-422 device to
a Sony (or compatible) 207M (SMPTE) 9-pin connector.
This cable is 72” in length.

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© Sealevel Systems, Inc. 3547 Manual | SL9192 7/2021
Terminal Blocks
Terminal Block Kit (Item# KT105)
The KT105 terminal block kit breaks out a DB9 connector to
9 screw terminals to simplify field wiring of serial
connections including RS-422 and RS-485 networks. The kit
includes one DB9 terminal block (Item# TB05) and one
DB9M to DB9F 72” extension cable (Item# CA127).
Terminal Block –DB9F to 9 Screw Terminals (Item# TB05)
The TB05 terminal block breaks out a DB9 connector to
9 screw terminals to simplify field wiring of serial
connections including RS-422 and RS-485 networks. The
TB05 is designed to connect directly to Sealevel DB9
serial cards or any cable with a DB9M connector.
Adapters and Converters
DB9F to RJ45 Modular Adapter (Item# RJ9S8)
The RJ9S8 is a DB9 female to RJ45 adapter. It can be
configured without tools, and it is an excellent choice for
using available infrastructure wiring.
DB9F (RS-422) to DB9F Converter (Item# DB103)
The DB103 is designed to convert a Sealevel DB9 male
RS-422 connector to a DB9 female pinout compatible
with AC24AT and AC422AT Opto 22 ISA bus cards.

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© Sealevel Systems, Inc. 3547 Manual | SL9192 7/2021
PC/104 Adapter Kits
PC/104 to CompactFlash Adapter (Item# CF104)
The CF104 allows users to easily add a CompactFlash
memory card with an IDE interface to a PC/104 stack.
The CF104 includes an adapter board built into the
PC/104 form factor. The arrangement of mounting holes
at the corners allows the board to be rotated and
mounted 180 degrees on the long axis.
PC/104 to 2.5” Hard Drive Adapter (Item# HD104)
The HD104 allows users to easily add an optional 2.5”
hard drive with an IDE interface to a PC/104 stack. The
HD104 includes an adapter board built into the PC/104
form factor and offers two different mounting options.

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© Sealevel Systems, Inc. 3547 Manual | SL9192 7/2021
Card Setup
The 3547 contains a single 4 position DIP-Switch (labeled SW1) that provides the address selection for the
adapter and a jumper strip (labeled E5) providing the IRQ selection for the adapter.
Address Selection
Each port on the 3547 occupies sixteen consecutive I/O locations. The DIP switch is used to set the base
address for the serial ports and 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
OFF
ON
300
310
320
330
OFF
ON
OFF
400
410
420
430
OFF
ON
ON
500
510
520
530
ON
OFF
OFF
600
610
620
630
ON
OFF
ON
1500
1510
1520
1530
ON
ON
OFF
3220
3230
3240
3250
ON
ON
ON
4220
4230
4240
4250
The fourth switch, ‘S’ on the DIP switch is used to allow a shared interrupt between multiple PC/104
adapters. Reference the Interrupt Modes section on the following page for additional information.
An image and a drawing of the DIP switch (SW1) are shown below.

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© Sealevel Systems, Inc. 3547 Manual | SL9192 7/2021
Port Enable/Disable
All four ports on the 3547 can be disabled by setting the switches 1, 2, and 3 on SW1 to the ‘Off’ position.
The ports are 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 from E5.
IRQ Selection
The 3547 has an interrupt selection jumper (labeled E5) for all four of the ports. Be sure to set the interrupt
required by your application prior to installation. Consult the manual included with your software application
to determine the proper setting.
The jumpers located at E5 are used to select the appropriate interrupt for the adapter. The jumper for the
1K pull-down resistor (labeled ‘PD’) on E5 connects the resistor to the interrupt line to keep the line from
floating. This jumper must be connected when either a single board or multiple boards on different
interrupts are in use. In situations where multiple cards are sharing interrupts, only one board in the group
should have the PD resistor connected.
An image and a drawing of E5 are included below.

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© Sealevel Systems, Inc. 3547 Manual | SL9192 7/2021
Interrupt Modes
Shared interrupt mode is used to allow more than one PC/104 board to share a single IRQ. The switch
position ‘S’ on DIP switch SW1, when moved to the ‘on’ position, selects the shared interrupt mode for the
adapter. When configuring two or more PC/104 adapters, the following criteria must be met:
•The ‘S’ switch on DIP switch SW1 should be set to ‘on’ for each adapter that will share an interrupt.
•The IRQ jumpers (E5) on each adapter need to be set to the same IRQ.
•Each board must be set to a different address. For example, if two boards are used, the addresses
might be set as follows:
DIP switch:
1
2
3
S
Board 1:
Off
Off
On
On
Board 2:
Off
On
Off
On
Refer to the Address Selection section for additional information.
•Only one card in the group should have the pull-down (PD) on E5 activated.
The image below shows what the DIP switch and jumper settings would look like for two PC/104 boards
installed in the same computer.
In situations where PC/104 boards do not need to share interrupts, make sure that the switch position ‘S’
on DIP switch SW1 is moved to the ‘off’ position. In addition, the IRQ jumpers on E5 should be set to different
interrupts for each board.