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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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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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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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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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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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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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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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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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.

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Clock Modes
The 3547 utilizes a 14.7456 MHz oscillator. This is eight times faster than a standard COM: port oscillator,
which typically is 1.8432 MHz. This allows the adapter to achieve a maximum data rate of 921.6K bps. The
following sections outline the baud rate calculations and instructions for achieving your desired baud rate.
Oscillator Value (Aliasing)
If Windows operating system used, the oscillator value (14.7456 MHz) should be entered into the ‘Advanced’
tab in the Device Manager. This is usually done automatically when the Sealevel SeaCOM driver is loaded.
If you are using a Windows operating system, the Sealevel SeaCOM driver will typically set the oscillator
value automatically. To set the value manually, open the Windows Device Manager and click on ‘Ports (COM
& LPT).’ Locate the port number for your device and right click to select ‘Properties.’ In the Properties
window, open the ‘Port Settings’ tab and click on the ‘Advanced’ button. Enter the oscillator value (14.7456).
If using an operating system other than Windows, you may need to manually enter the oscillator
value. If you do not do this, all data rates will be eight times the selected rate. For example, if a data
rate of 19.2Kbps is selected, the actual data rate will be 153.6Kbps. Refer to Baud Rates section on
the following page for appropriate settings and divisors.
Baud Rates
The SeaCOM driver for Windows will automatically set the correct data rate for your card. However, if you
are using an operating system other than Windows, the data rate will be eight times the selected rate. You
may need to set the data rate manually in order to configure the card to run at the desired rate.
If your operating system does not allow you to manually set the oscillator value on your card, you will need
to select a data rate that is eight times less than the desired rate. The table below includes some common
data rates.
You can also choose additional baud rates by dividing the baud rate you wish to achieve by eight.
The resulting number will be the baud rate you will need to tell your system in order to cause your
card to run at the desired rate.

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Baud Rates, Continued
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
38.4 K bps
4800 bps
115.2 K bps
14.4K bps
230.4K bps
28.8K bps
460.8K bps
57.6 K bps
921.6K bps
115.2 K bps
In situations where you are communicating with the hardware directly, or using software that requires a
divisor, you will need to select a divisor that will cause your card to run at the desired rate. The table below
includes some common divisors.
You can also select other divisors by diving 921.6K by your intended baud rate. The resulting number
will be the divisor that you will need to give your system for your card to run at the desired rate.
For this Data Rate
Choose this Divisor
1200 bps
768
2400 bps
384
4800 bps
192
9600 bps
96
19.2K bps
48
38.4K bps
24
57.6K bps
16
115.2K bps
8
230.4K bps
4
460.8K bps
2
921.6K bps
1

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Programmable Features
Each of the ports on the 3547 can be individually software configured as an RS-422 or RS-485 interface.
Electrical interface selection is handled via the ‘Control’ port (Base + 15) or via the Sealevel SeaCOM driver
interface in Windows Device Manager.
Power up default = 2-wire RS-485 with RTS
D2
D1
D0
Mode
X
X
0
RS-422
0
0
1
RS-485, 4-wire, RTS auto-enable
0
1
1
RS-485, 4-wire, DTR auto-enable
1
0
1
RS-485, 2-wire, RTS auto-enable
1
1
1
RS-485, 2-wire, DTR auto-enable
D0 = RS-422/485; D1 = RTS/DTR auto-enable; D2 = 2-wire/4-wire
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 510-ohm pull-up/pull-down
combination that biases the receiver inputs. If multiple 3547 adapters are configured in an RS-485 network,
only the boards on each end should have the termination in place. If you have additional questions on how
to remove this termination, contact Technical Support at 864-843-4343.
RS-485 'Echo'
The RS-485 ‘Echo’ is the result of connecting the receiver inputs to the transmitter outputs. Each 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), but it can also confuse the system if the software
cannot support echoing.
Echo is controlled on a per-port basis by jumpers E1, E2, E3, and E4. When a jumper is in place, Echo is
suppressed. Similarly, Echo can be enabled by removing a jumper from the appropriate port. The image
below shows jumper E1 located next to P1.

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Installation & Configuration
Windows Software 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]om to receive access to the legacy driver download and installation
instructions.
1. Begin by locating, selecting, and installing the correct SeaCOM software from Sealevel’s
website: SeaCOM Software Overview.
2. Select SeaCOM for Microsoft Windows.
3. Select SeaCOM for Windows in the Downloads section.
4. The setup file will automatically detect the operating environment and install the proper
components.
You are now ready to proceed with installing the 3547 in your system. Refer to the following section,
Hardware Installation, for details.

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Linux Installation
You MUST have “root” privileges to install the software and drivers.
The syntax is case sensitive.
SeaCOM for Linux can be downloaded here: https://www.sealevel.com/support/software-seacom-linux/.
It includes the README and the Serial-HOWTO help files (located at seacom/dox/howto). This series of
files both explains typical Linux serial implementations and informs the user about Linux syntax and
preferred practices.
User can use a program such as 7-Zip to extract the tar.gz file.
In addition, the software selectable interface settings can be accessed by referencing
seacom/utilities/3540mode.
For additional software support, please call Sealevel Systems’ Technical Support, [phone]. Our
technical support is free and available from 8:00 AM - 5:00 PM Eastern Time, Monday through Friday. For
email support contact: [e-mail].

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Hardware Installation
Take extreme care when installing the adapter to avoid damaging the PC/104 connector pins. Be
sure to follow proper ESD procedures by grounding yourself and the adapter.
To install the 3547 into your computer, follow the steps below.
1. Turn off PC power and disconnect the power cord.
2. Remove the case cover (if applicable).
3. Mount the hardware using the nylon stand-offs and/or screws provided to ensure a good
mechanical connection. Retain any unused mounting hardware for future expansion.
4. Gently insert the adapter noting proper key orientation of the expansion connector on a PC/104
compatible card. The adapter is keyed per the current PC/104 specification to prevent the adapter
from being inserted incorrectly.
5. After the adapter is installed, connect up to four I/O cables to the 10-pin headers at Ports 1 through.
These headers are keyed to prevent cables from being installed incorrectly.
The optional CA152 cable is an eight inch long IDC ribbon cable with a 10-pin connector on one end
and a DB9 male connector on the other end. The CA152 can be panel mounted in your enclosure.
6. Proceed with adding additional PC/104 cards (if applicable) and secure with additional standoffs.
If this board is at the top of the PC/104 stack, secure the board with #4-40 machine screws.
7. Replace the cover (if applicable).
8. Connect the power cord and power up the machine.
You are now ready to configure the PC/104 adapter to work in your application. Refer to the following
section, Hardware Configuration, for details.

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Hardware Configuration
1. Run the ‘Add Hardware’ utility located in the Control Panel. Double click the icon to launch the
wizard and follow the prompts.
•Windows will first search for plug and play devices. Windows will be unable to locate the
board because it is not plug and play.
•The wizard will ask if you have already installed the hardware, click on ‘yes.’
•When the Installed Hardware List appears, select ‘Add a new hardware device’ at the
bottom of the list.
•Windows will ask if you want the system to search for additional devices. Select ‘I want to
install the hardware I manually select from a list’ and click on the ‘Next’ button.
•Windows will display a list of common hardware types. Select ‘Show all devices’ and click
on ‘Next.’ The system will compile a thorough list of hardware.
•Once the list is compiled, locate the left hand column, and select ‘Sealevel Systems, Inc.’
from the list. Next, locate the right hand column and select ‘C4-104.485+1: PC-104 4 Port
RS-422/485 (3547)’ from the list and click ‘Next.’
•Windows will show a warning message that the hardware has not passed Windows logo
testing. Click on the ‘Continue anyway’ button.
All applications and drivers have been fully tested to maintain the integrity of your operating system.
Clicking on ‘Continue anyway’ will not harm your system in any way.
•The Completing Add Hardware wizard will appear. At the bottom of the window, click on
the link titled ‘View or change resources for this hardware (advanced).’
•On the Resources page, click on the ‘Set configuration manually’ button.
Be sure that the setting you select for the configuration match the settings on your board.
This window will show the default settings for the I/O address and one IRQ. Since Windows cannot
detect the settings there may be a conflict with another device or the settings shown may be not
the settings you wish to use.

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Hardware Configuration, Continued
•To change the settings, choose the appropriate basic configuration number in the ‘Setting
Based On’ field to match the card settings.
•In the Resource Settings box, scroll to the bottom of the list and double click on ‘IRQ’ to
open the Interrupt Request box.
•In the Value field, select the interrupt that the board is set to. This interrupt will be shared
by all four ports.
•Click on ‘Ok’ to close the interrupt request box.
•Click on ‘Ok’ again to close the Resource Settings box and click on ‘Finish’ in the Completing
Add Hardware box.
•The computer will prompt you to shut down and reboot the system.
2. Once the hardware has been installed, restart your system.
3. After the system reboots, the Found New Hardware wizard will appear for each port that you are
installing (up to four in this case).
•Click on ‘Install the software automatically’ followed by the ‘Next’ button.
•The warning message stating that the device has not passed Windows logo testing will
appear (this is the same message you saw earlier in the process), and you should click on
‘Continue Anyway.’
•Click on ‘Finish.’ Repeat this process for the remaining ports on the card.
The installation instructions above are best used with Windows XP. If you are using a different
version of Windows, and need additional assistance, contact Technical Support at 864-843-4343.
For email support contact: [e-mail].
To confirm that the drivers have been successfully installed, you can look in the Device Manager under
‘Ports (COM &LPT)’ and each of the ports that you installed should be included on the list with their
associated COM numbers.
In addition, the software selectable settings can be accessed and changed via the ‘Advanced’ tab in the
device manager. The ‘Software Selectable Cards’ section allows the electrical interface to be changed
between RS-422, RS-485 3-wire, and RS-485 4-wire. For additional information, reference the Programmable
Features section of this manual.

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Electrical Specifications
The 3547 provides four RS-422/485 software programmable ports from a single PC/104 adapter. The 3547
utilizes the 16954 UART. This chip supports 9-bit protocol and features programmable baud rate, data
format, interrupt control and industry leading 128-byte transmit and receive FIFOs.
Connector Pinouts
10-pin Pinout
This board uses a 10-pin 0.1” box header for each of its four ports. This pinout for each port is included
below.
Pin #
Signal
1
RX+/Data+
2
NC
3
RX-/Data-
4
NC
5
TX-
6
NC
7
TX+
8
NC
9
GND
10
NC

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Connector Pinouts, Continued
DB9 Pinout
The optional CA152 cable is an eight inch long IDC ribbon cable with a 10-pin connector on one end and a
DB9 male connector on the other. This cable provides the standard Sealevel Systems DB9 pinout for RS-
422/485. This pinout is shown below.
Pin #
Signal
1
RX+/Data+
2
RX-/Data-
3
TX-
4
TX+
5
GND
6
NC
7
NC
8
NC
9
NC