SeaLevel SIO-104 User manual

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© Sealevel Systems, Inc. 3551 Manual | SL9122 9/2022
SIO-104
User Manual | 3551

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© Sealevel Systems, Inc. 3551 Manual | SL9122 9/2022
Contents
CONTENTS...........................................................................................................................................................2
INTRODUCTION ................................................................................................................................................... 3
BEFORE YOU GET STARTED ...............................................................................................................................4
CARD SETUP ........................................................................................................................................................5
SOFTWARE INSTALLATION ................................................................................................................................9
PHYSICAL INSTALLATION................................................................................................................................10
TECHNICAL DESCRIPTION ...............................................................................................................................11
SPECIFICATIONS ...............................................................................................................................................12
APPENDIX A – TROUBLESHOOTING................................................................................................................13
APPENDIX B – HOW TO GET ASSISTANCE .....................................................................................................14
APPENDIX C – ELECTRICAL INTERFACE ........................................................................................................15
APPENDIX D – PC/104......................................................................................................................................16
APPENDIX E – SILK SCREEN ............................................................................................................................17
WARRANTY ........................................................................................................................................................18
................................................................................................................................................................................

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© Sealevel Systems, Inc. 3551 Manual | SL9122 9/2022
Introduction
The SIO-104 is the ultimate single port RS-232 serial connection for your PC/104 application. The SIO-104
utilizes the Exar 16C850, which provides 128-byte, transmit and receive FIFOs. These larger buffers allow
error free operation even in high-speed applications.

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© Sealevel Systems, Inc. 3551 Manual | SL9122 9/2022
Before You Get Started
What’s Included
The SIO-I04 is shipped with the following items. If any of these items are missing or damaged, contact the
supplier.
•(1) SIO-104 Serial Interface Adapter
•(1) Nylon Mounting Hardware Kit (PC304-NK)
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. 3551 Manual | SL9122 9/2022
Optional Accessories
Depending upon your application, you are likely to find one or more of the following items useful with the
SIO-104. All items can be purchased from our website (www.sealevel.com) or by calling our sales team
at 864-843-4343.
•CA152 - Terminates the SIO-104 10 pin header to a DB9M connector. This termination provides
the Sealevel Systems’ DB9 standard for RS-422/485.
Card Setup
The SIO-104 contains several jumper straps for each port, which must be set for proper operation.
Address Selection
The SIO-104 occupies eight consecutive I/O locations. A 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 ports.
The following table shows several examples that typically do not cause a conflict. SW1 sets the I/O address
for the SIO-104.
Address
Binary
Switch Position Setting
Hex
A9 A0
1
2
3
4
5
6
7
280-287
1010000XXX
Off
On
Off
On
On
On
On
2A0-2A7
1010100XXX
Off
On
Off
On
Off
On
On
2E8-2EF
1011101XXX
Off
On
Off
Off
Off
On
Off
2F8-2FF
1011111XXX
Off
On
Off
Off
Off
Off
Off
3E8-3EF
1111101XXX
Off
Off
Off
Off
Off
On
Off
300-307
1100000XXX
Off
Off
On
On
On
On
On
328-32F
1100101XXX
Off
Off
On
On
Off
On
Off
3F8-3FF
1111111XXX
Off
Off
Off
Off
Off
Off
Off
Figure 1 - Address Selection Table

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© Sealevel Systems, Inc. 3551 Manual | SL9122 9/2022
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 300 is selected as a base. Address 300 in
binary is XX11 0000 0XXX where X = a non-selectable address bit.
ON
A9
1
2
3
4
5
6
7
8
EN
A3
Figure 2 - DIP-Switch Illustration
Setting the switch “On” or “Closed” corresponds to a “0” in the address, while leaving it “Off” or
“Open” corresponds to a “1”.
Port Enable / Disable
The port on the SIO-104 can be enabled or disabled with switch position 8 on the DIP-switch. The port is
enabled with the switch “On” or “Closed” and disabled when “Off” or “Open” (refer to Figure 2). If the port is
disabled, be sure to also disable the interrupt request for that port by removing the IRQ jumper at header
J2.
IRQ Selection
The SIO-104 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. Position “R” is provided so that a jumper can be installed that connects a 1K-Ohm pull-
down resistor to the output of a high-impedance tri-state driver which carries the IRQ signal. Because the
IRQ line is driven low only by the pull-down resistor, it is possible for two or more boards to share the same
IRQ signal. Position “R” installed is the default setting and should be left as is unless multiple cards are
sharing a single IRQ. If multiple adapters are sharing a single IRQ, then only one adapter should have the
pull-down resistor (position “R” selected) in the circuit.
The IRQ can be set at jumper J2 for IRQ 2/9, 3-5, 7, 10, 11, 12, or 15. In the following example, the IRQ is set
as IRQ4.

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© Sealevel Systems, Inc. 3551 Manual | SL9122 9/2022
Figure 3 - Header J2, IRQ Selection (Factory Default)
Clock Modes
The ULTRA 530.PCI employs a unique clocking option that allows the end user to select from divide by 4
and divide by 1 clocking modes. These modes are selected at Header E8.
To select the Baud rates commonly associated with COM: ports (i.e. 2400, 4800, 9600, 19.2, … 115.2K Bps)
place the jumper in the divide by 4 mode (silk-screen DIV4).
Figure 4 - Clocking Mode 'Divide by 4'
To select the maximum data rate (460.8K bps) place the jumper in the divide by 1 (silk-screen DIV1)
position.
Figure 5 - Clocking Mode 'Divide By 1'
DIV1
DIV4
DIV1
DIV4

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© Sealevel Systems, Inc. 3551 Manual | SL9122 9/2022
Baud Rates and Divisors for the ‘Div1’ mode
The following table shows some common data rates and the rates you should choose to match them if
using the adapter in the ‘Div1’ mode.
For this Data Rate
Choose this Data Rate
1200 bps
300 bps
2400 bps
600 bps
4800 bps
1200 bps
9600 bps
2400 bps
19.2K bps
4800 bps
57.6 K bps
14.4K bps
115.2 K bps
28.8K bps
230.4K bps
57.6 K bps
460.8K bps
115.2 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
384
2400 bps
192
4800 bps
96
9600 bps
48
19.2K bps
24
38.4K bps
12
57.6K bps
8
115.2K bps
4
230.4K bps
2
460.8K bps
1

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© Sealevel Systems, Inc. 3551 Manual | SL9122 9/2022
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 3551 to your system. Refer to the Hardware
Installation section for details.
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.

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© Sealevel Systems, Inc. 3551 Manual | SL9122 9/2022
In addition, the software selectable interface settings can be accessed by referencing
seacom/utilities/3551mode.
For additional software support, including QNX, please call Sealevel Systems’ Technical Support, (864) 843-
4343. 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].
Physical Installation
Extreme care should be taken when installing the SIO-104 to avoid causing damage to the connectors.
After the adapter is installed, connect your I/O cable to J1. Please note these headers are keyed so that pin
1 of the cable matches pin 1 of the connector. Refer to Card Setup for information on setting the address
and jumper options before inserting the SIO-104 onto the stack.
Do not install the Adapter in the machine until the software has been fully installed.
1. Turn off PC power. Disconnect the power cord.
2. Remove the case cover (if applicable).
3. Gently insert the SIO-104 into the connector noting proper key orientation of the expansion
connector on a PC/104 compatible card. The SIO-104 adapter is keyed per the current PC/104
Specification. This will aid in preventing the adapter from being inserted incorrectly.
4. Mounting hardware (nylon stand-offs and screws) is provided to ensure a good mechanical
connection. Retain any mounting hardware not used to allow for future expansion.
5. The cables provided are keyed and can be installed before or after the adapter is inserted in the
stack.
6. Replace the cover.
7. Connect the power cord and power up the machine.
Installation is complete.