SeaLevel SIO-104 User manual

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© Sealevel Systems, Inc. 3501 Manual | SL9036 12/2022
SIO-104
User Manual | 3501, 3500

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© Sealevel Systems, Inc. 3501 Manual | SL9036 12/2022
Contents
CONTENTS...........................................................................................................................................................2
INTRODUCTION ................................................................................................................................................... 3
BEFORE YOU GET STARTED ...............................................................................................................................4
SOFTWARE INSTALLATION................................................................................................................................5
CARD SETUP ........................................................................................................................................................6
PHYSICAL INSTALLATION..................................................................................................................................8
TECHNICAL DESCRIPTION ................................................................................................................................. 9
SPECIFICATIONS ...............................................................................................................................................11
APPENDIX A – TROUBLESHOOTING................................................................................................................12
APPENDIX B – HOW TO GET ASSISTANCE .....................................................................................................13
APPENDIX C – ELECTRICAL INTERFACE ........................................................................................................14
APPENDIX D – PC/104......................................................................................................................................16
APPENDIX E – SILK SCREEN ............................................................................................................................17
APPENDIX F – COMPLIANCE NOTICES...........................................................................................................18
WARRANTY ........................................................................................................................................................19

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© Sealevel Systems, Inc. 3501 Manual | SL9036 12/2022
Introduction
Overview
The SIO-104 series provides the ultimate serial connection for your PC/104 application. The SIO-104 is
available in three different interfaces, RS-422/485, RS-232, and MIDI.
The RS-422/485 model (P/N 3500) provides an interface capable of long length, high speed
communications.
The RS-232 model (P/N 3501) provides a standard RS-232C interface that is fully compatible all popular
modem software, network operating systems software, and mouse drivers.
The MIDI model (P/N 3502) provides an interface suitable for control of musical instruments, MIDI
sequencers and other compatible equipment.
Factory Default Settings
The SIO-104 factory default settings are as follows:
Base
Address
IRQ
Port 1
280
5

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© Sealevel Systems, Inc. 3501 Manual | SL9036 12/2022
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.
•SIO-104 Serial Interface Adapter
•(1) DB-9 cable assembly (P/N 3500, 3501), or (1) MIDI cable assembly (P/N 3502)
•(1) Nylon Mounting Hardware Kit
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. 3501 Manual | SL9036 12/2022
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 SeaCOM Asynchronous Serial Software
Suite.
2. Select “Download Now” for SeaCOM for Windows.
3. The setup files will automatically detect the operating environment and install the proper
components. Follow the information presented on the screens that follow.
4. A screen may appear with text similar to: “The publisher cannot be determined due to the
problems below: Authenticode signature not found.” Please click the ‘Yes’ button and
proceed with the installation. This declaration simply means that the operating system is
not aware of the driver being loaded. It will not cause any harm to your system.
5. During setup, the user may specify installation directories and other preferred
configurations. This program also adds entries to the system registry that are necessary
for specifying the operating parameters for each driver. An uninstall option is also included
to remove all registry/INI file entries from the system.
6. The software is now installed, and you can proceed with the hardware installation.
Other Operating Systems
Refer to the appropriate section of the Serial Utilities Software.
For your reference, record installed SIO-104 settings below:
Base
Address
IRQ
Port 1
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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© Sealevel Systems, Inc. 3501 Manual | SL9036 12/2022
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
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.
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”.
ON
A9
1 2 3 4 5 6 7 8
EN
A3

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© Sealevel Systems, Inc. 3501 Manual | SL9036 12/2022
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.
Figure 3 - Header J2, IRQ Selection (Factory Default)
RS-485 Mode (RTS Enable)
J4 selects whether the RS-485 driver is enabled by the UART signal Request To Send (RTS) or always
enabled. With the jumper installed, RTS enables the RS-485 driver. Removing the jumper enables the driver
regardless of RTS. The jumper should be installed for a 2/4 wire RS-485 application where the SIO-104 is
acting as a polled node on a multi-drop network. Remove the jumper if you are using a point to point RS-
422 application such as programmable logic controllers (PLCs), etc.

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© Sealevel Systems, Inc. 3501 Manual | SL9036 12/2022
Physical Installation
Do not install the Adapter in the machine until the software has been fully installed.
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 cables to J1-J4. 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.
1. Turn off PC power. Disconnect the power cord.
2. Remove the PC case cover (if applicable).
3. Gently insert the SIO-104 connector P1 noting proper key orientation of the expansion
connector on a PC/104 compatible card. The SIO-104 adapter is keyed per the PC/104
Revision 2.1 Specification. This will aid in preventing the adapter from being inserted
incorrectly.
4. Mounting hardware (nylon stand-offs and screws) is provided to insure 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.
Installation is complete

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© Sealevel Systems, Inc. 3501 Manual | SL9036 12/2022
Technical Description
The SIO-104 series provides the ultimate serial connection for your PC/104 application. The SIO-104
utilizes the 16550 UART. This chip features programmable baud rate, data format, interrupt control and a
16 Byte input and output FIFO.
The SIO-104-422 (P/N 3500) is equipped with the RS-422/485 interface allowing long length, high speed
communications suitable for data collection and shop floor control.
The SIO-104-232 (P/N 3501) provides a standard RS-232C interface that is fully compatible with the DOS
operating system, all popular modem software, network operating systems software, and mouse drivers.
The SIO-104-MIDI (P/N 3502) allows the controlling of Keyboards, sound modules, and drum machines
which all can be interconnected and driven by sequencing software. The MIDI specification has been
updated recently to include tape deck control for automated recording and stage & light show control for
real-time theatrical production.
Features
• Selectable interrupts (IRQs) 2/9, 3, 4, 5, 7, 10, 11, 12, 15
• Multiple adapters can share the same IRQ
• 16550 UART standard, 16C650 UART optional
• Uses PC/104 compatible stack through connector for universal mounting
• 5 volt DC operation
Modem Control Signal Considerations
Some software packages require the use of the modem handshake signals such as CTS or DCD. Refer to
your application software manual to determine the requirements for modem control signals. If no
requirements are mentioned, a safe configuration is to tie DTR to DSR and DCD, and tie RTS to CTS. This
configuration will typically satisfy the modem control signal requirements for most communications
software.

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© Sealevel Systems, Inc. 3501 Manual | SL9036 12/2022
Connector Pin Assignments
RS-232
Signal
Name
DB-9
Mode
GND
Ground
5
TD
Transmit Data
3
Output
RTS
Request To Send
7
Output
DTR
Data Terminal Ready
4
Output
RD
Receive Data
2
Input
CTS
Clear To Send
8
Input
DSR
Data Set Ready
6
Input
CD
Carrier Detect
1
Input
RI
Ring Indicator
9
Input
These assignments meet EIA/TIA/ANSI-574 DTE for DB-9 type connectors.
RS-422/485
Signal
Name
Pin #
Mode
GND
Ground
5
TX +
Transmit Data Positive
4
Output
TX-
Transmit Data Negative
3
Output
RTS+
Request to Send Positive
6
Output
RTS-
Request to Send Negative
7
Output
RX+
Receive Data Positive
1
Input
RX-
Receive Data Negative
2
Input
CTS+
Clear to Send Positive
9
Input
CTS-
Clear to Send Negative
8
Input
Please terminate any control signals that are not going to be used. The most common way to do this
is connect RTS to CTS and RI. Also, connect DCD to DTR and DSR. Terminating these pins, if not used,
will help insure you get the best performance from your adapter.
MIDI
Signal
Name
Pin #
Mode
MTX +
Transmit Data +
5
Output
MTX-
Transmit Data -
9
Output
GND
Ground
2,6
MRX+
Receive Data +
4
Input
MRX-
Receive Data -
8
Input
MIDI Thru +
3
Output
MIDI Thru -
7
Output