SeaLevel SIO-104 User manual

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© Sealevel Systems, Inc. 3588 Manual | SL9008 9/2022
SIO-104+8.485
User Manual | 3588

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© Sealevel Systems, Inc. 3588 Manual | SL9008 9/2022
Contents
CONTENTS...........................................................................................................................................................2
INTRODUCTION ................................................................................................................................................... 3
BEFORE YOU GET STARTED ...............................................................................................................................4
HARDWARE SETUP ............................................................................................................................................. 6
INSTALLATION ....................................................................................................................................................9
ELECTRICAL SPECIFICATIONS.........................................................................................................................14
SPECIFICATIONS ...............................................................................................................................................14
APPENDIX A – TROUBLESHOOTING................................................................................................................15
APPENDIX B – HOW TO GET ASSISTANCE .....................................................................................................16
APPENDIX C – ELECTRICAL INTERFACE ........................................................................................................17
APPENDIX D – ASYNCHRONOUS COMMUNICATIONS ..................................................................................18
APPENDIX E – SILK SCREEN – 3588 PCB .......................................................................................................19
WARRANTY ........................................................................................................................................................20

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© Sealevel Systems, Inc. 3588 Manual | SL9008 9/2022
Introduction
The SIO-104+8.485, Item Number 3588, is a PC/104 serial interface module with eight 2-wire RS-485 serial
interface ports, supporting data rates up to 921.6K bps. The board is designed using a pair of 16C954
UARTs with 128-byte FIFOs. The 16C954 features a flexible clock prescalar (from 1 to 31.875), 9-bit
protocol support, and isochronous mode.
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). Optional terminal block adapters are available to
simplify field-wiring connections.
The SIO-104+8.485 is designed to be used with a variety of Operating Systems including Windows
98/NT/ME/2000/XP, Linux, and DOS. The SeaCOM API (Application Programmer Interface) included on CD
with the SIO-104+8.485 provides a variety of useful high-level function calls implemented as a Windows
dynamic link library (DLL) and as a Linux kernel module and library. In addition to the API, SeaCOM includes
sample code and utilities to simplify software development.
Other Sealevel PC/104 Serial Products
Model No.
Part No.
Description
ULTRA SIO-104
(P/N 3550)
- 1 Port RS-422/485
SIO-104
(P/N 3551)
- 1 Port RS-232
SIO.104+2
(P/N 3502)
- 2 Port RS-232/422/485
C4-104.ULTRA
(P/N 3540)
- 4 Port RS-232/422/485
SIO4-104.232
(P/N 3542)
- 4 Port RS-232
SIO-104.485
(P/N 3543)
- 4 Port RS-422/485
SIO4-104.2+2
(P/N 3544)
- 2 Port RS-232 & 2 Port 422/485

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© Sealevel Systems, Inc. 3588 Manual | SL9008 9/2022
Before You Get Started
What’s Included
The SIO-104+8.485 is shipped with the following items. If any of these items is missing or damaged, please
contact Sealevel for replacement.
•Item# 3588 – SIO-104+8.485 PC/104 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.

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© Sealevel Systems, Inc. 3588 Manual | SL9008 9/2022
Optional Items
Depending upon your application, you are likely to find one or more of the following items useful with the
SIO-104+8.485. All items can be purchased from our website (www.sealevel.com) or by calling our sales
team at 864-843-4343.
Cables Options
•DC40 Ribbon Cable to (4) DB9M, 14” in Length - (P/N CA273)
−Terminates a 40-pin header to four bulkheads mountable DB9 Male
connectors. Two are required to terminate both 40-pin headers (all eight
ports).
•IDC40 Ribbon Cable to DB37M, 6” in Length – (P/N CA110)
−Provides a bulkhead mountable DB37 male connector. Designed to be used
with the CA143 or with a customer supplied DB37 cable.
•DB37F Shielded Cable to (4) DB9M, 36” in Length - (P/N CA143)
−Terminates the DB37 connector to four DB9 male connectors via a 36”
shielded ‘spider’ cable. Designed to be used with the CA110 cable.
•IDC40 to IDC40 Ribbon Cable, 18” in Length – (P/N CA222)
−IDC 40-pin ribbon cable wired straight through. Standard IDE cable that can
be used to connect 40-pin header equipped PC/104 boards to terminal
blocks, like the TB10.
•IDC40 to (4) DB9M Terminal Block - (P/N TB10)
−Bulkhead mountable terminal block assembly with a 40-pin header that
terminates to four DB9 male connectors. Can easily be integrated into the
Relio™ line of embedded I/O servers from Sealevel Systems.

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© Sealevel Systems, Inc. 3588 Manual | SL9008 9/2022
Hardware Setup
Address Selection
The SIO-104+8.485 occupies 8 consecutive I/O locations. The DIP-switch (SW1) is used to set the
base address for these locations. Be careful when selecting the base address as some selections
conflict with existing PC ports. The following table shows the addressing options available. If
different address options are required, please contact Sealevel Systems Technical Support about
a custom option.
SW1-1
SW1-2
SW1-3
Port 1
Port 2
Port 3
Port 4
Port 5
Port 6
Port 7
Port 8
OFF
OFF
OFF
DISABLED
OFF
OFF
ON
300
308
310
318
320
328
330
338
OFF
ON
OFF
400
408
410
418
420
428
430
438
OFF
ON
ON
500
508
510
518
520
528
530
538
ON
OFF
OFF
600
608
610
618
620
628
630
638
ON
OFF
ON
1500
1508
1510
1518
1520
1528
1530
1538
ON
ON
OFF
3220
3228
3230
3238
3240
3248
3250
3258
ON
ON
ON
4220
4228
4230
4238
4240
4248
4250
4258
Interrupt Configuration
The board is set up to always share interrupts. There is a jumper labeled “PD” which is located at
(E1) on the SIO-104+8.485. Setting this jumper enables a 1K-ohm pull-down (biasing) resistor
required on one adapter when sharing interrupts. The jumper should always be enabled on single
SIO-104+8.485 installations (non-shared mode). In multiple SIO-104+8.485 installations, only one
board should have the jumper enabled.
IRQ Selection
The SIO-104+8.485 has an interrupt selection jumper located at (E1), 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.
The SIO-104+8.485 supports the following interrupts: 3, 4, 5, 7, 9, 10, 11, 12, and 15.
Clock Modes
The SIO-104+8.485 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.

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© Sealevel Systems, Inc. 3588 Manual | SL9008 9/2022
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 SIO-104+8.485. If using Windows 95, 98, ME, 2000, or XP, the oscillator value
(14.7456 MHz) should be entered into the ‘Advanced’ tab on the 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
153.6K bps.
When using any other OS (i.e. Linux or DOS) 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
38.4K bps 4800 bps
57.6K bps 7200 bps
115.2K bps 14.4K bps
230.4K bps 28.8K bps
460.8K bps 57.6 K bps
921.6K 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 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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© Sealevel Systems, Inc. 3588 Manual | SL9008 9/2022
RS-485 Enable
RS-485 is optimized for party line or multi-drop applications. The output of the RS-485 driver is
capable of being active (enabled) or tri-state (disabled). This capability allows multiple PCs to be
connected in a multi-drop bus and selectively polled. Using the Sealevel SeaCOM driver, RS-485
enable is handled in hardware by the UART. This allows the RS-485 driver to be tri-stated when
inactive on a multi-drop polled network. The SIO-104-+8.485 is equipped with 16C954 UARTs that
enable the RS-485 drive automatically.
Line Termination
Typically, each end of the RS-485 bus must have line-terminating resistors. The SIO-104+8.485
features a 120-ohm resistor is across each RS-485 input and a 510-ohm pull-down resistor
combination that biases the receiver inputs. The board is not designed to have multiple adapters
on the same RS-485 network. Contact Sealevel Technical Support if you have questions on how to
remove this termination.
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. The SIO-104+8.485 automatically suppresses
this ‘Echo’.

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© Sealevel Systems, Inc. 3588 Manual | SL9008 9/2022
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 3588 to your system. Refer to the Hardware
Installation section for details.

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© Sealevel Systems, Inc. 3588 Manual | SL9008 9/2022
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/3588mode.
3rd Party Software Support
Third party software support for many HMI/MMI and other process control software is accessible through
links on the Sealevel’s website. For the most up to date information on third party software support, please
visit: https://www.sealevel.com/support/3rd-party-software-support/.
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].