SeaLevel Ultra 485.OPT022 User manual

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© Sealevel Systems, Inc. 7105-DB9 Manual | SL9053 9/2021
Ultra 485.OPT022
User Manual | 7105-DB9

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© Sealevel Systems, Inc. 7105-DB9 Manual | SL9053 9/2021
Contents
CONTENTS............................................................................................................................................................................................................................2
INTRODUCTION...................................................................................................................................................................................................................3
BEFORE YOU GET STARTED..............................................................................................................................................................................................4
CARD SETUP........................................................................................................................................................................................................................5
SEACOM SOFTWARE INSTALLATION..............................................................................................................................................................................9
HARDWARE INSTALLATION............................................................................................................................................................................................10
TECHNICAL DESCRIPTION...............................................................................................................................................................................................11
SPECIFICATIONS...............................................................................................................................................................................................................12
APPENDIX A –TROUBLESHOOTING.............................................................................................................................................................................13
APPENDIX B –HOW TO GET ASSISTANCE..................................................................................................................................................................14
APPENDIX C –ELECTRICAL INTERFACES....................................................................................................................................................................15
APPENDIX D –ASYNCHRONOUS COMMUNICATIONS.............................................................................................................................................16
APPENDIX E –SILK SCREEN ...........................................................................................................................................................................................17
APPENDIX F –COMPLIANCE NOTICES.........................................................................................................................................................................18
WARRANTY ........................................................................................................................................................................................................................19

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Introduction
Overview
The PCI bus 7105-DB9 is designed with a DB9 connector compatible with the AC24AT and AC422AT Opto-
22 ISA bus cards. This allows Optomux devices to be controlled from PCs that do not have an ISA bus
expansion slot available. The 7105-DB9 provides a single field selectable port configurable as RS-422/485
supporting asynchronous data rates up to 460.8K bps.
Choose the RS-422 mode for long distance device connections up to 4000ft. where noise immunity and
high data integrity are essential. Select RS-485 and capture data from multiple peripherals in a RS-485 multi-
drop network. Up to 31 RS-485 devices can be connected to each port to automate your data collection.
In RS-485 mode, our special auto-enable feature allows the RS-485 ports to be viewed by the operating
system as a COM: port. This allows the standard COM: driver to be utilized for RS-485 communications.
Our on-board hardware automatically handles the RS-485 driver enable.

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Before You Get Started
What’s Included
The ULTRA 485.OPTO22 is shipped with the following items. If any of these items is missing or damaged,
contact the supplier.
•ULTRA 485.OPTO22 Serial I/O 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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Card Setup
RS-485 Enable Modes
RS-485 is ideal for multi-drop or network environments. RS-485 requires a tri-state driver that will allow the
electrical presence of the driver to be removed from the line. The driver is in a tri-state or high impedance
condition when this occurs. Only one driver may be active at a time and the other driver(s) must be tri-
stated. The output modem control signal Request To Send (RTS) is typically used to control the state of the
driver. Some communication software packages refer to RS-485 as RTS enable or RTS block mode transfer.
One of the unique features of the ULTRA 485.OPTO22 is the ability to be RS-485 compatible without the
need for special software or drivers. This ability is especially useful in environments where the lower level
I/O control is abstracted from the application program. This ability means that the user can effectively use
the ULTRA 485.OPTO22 in an RS-485 application with existing (i.e., standard RS-232) software drivers.
Switch SW2 is used to control the RS-485 mode functions for the driver circuit. The selections are:
‘Auto’ enable (silk-screen ‘AT’). The ‘Auto’ enable feature automatically enables/disables the RS-485
interface via on board circuitry.
‘RTS’ enable (silk-screen ‘RT’) The ‘RTS’ mode uses the ‘RTS’ modem control signal to enable the RS-485
interface and provides backward compatibility with existing software products.
‘No Echo’ (silk-screen ‘NE’) is used to control the RS-485 enable/disable functions for the receiver based
on the state of the RS-422/485 transmitter. 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. This can be beneficial
if the software can handle echoing (i.e., using received characters to throttle the transmitter) or it can
confuse the system if the software does not. To select the ‘No Echo’ mode select silk-screen position ‘NE’.
Clock Modes
The ULTRA 485.OPTO22 employs a unique clocking option that allows the end user to select from divide
by 4 and divide by 1 clocking modes. SW2 positions 1 and 2 select the Divide by 1 (silk-screen D1) and
divide by 4 (silk-screen D4) modes.
To select the Baud rates commonly associated with COM: ports (i.e., 2400, 4800, 9600, 19.2, … 115.2K
Bps), set switch SW2 in the divide by 4 mode (silk-screen D4).
To select data rates up to the maximum of 460.8K bps, set switch SW2 in the divide by 1 (silk-screen D1)
position. Please refer to the following page for these additional data rates.
Do not set both switches on or invalid clocking will occur.

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CARD SETUP, CONTINUED
RS-485 Mode and Clock Mode Examples (Switch SW2)
Figure 1- Switch SW2, RS-422, Divide by 4
Figure 2 –Switch SW2, RS-485 ‘Auto’ Enabled, with ‘No Echo’ Divide by 4
Figure 3 - Switch SW2, RS-485 ‘Auto’ Enabled, with ‘Echo’ Divide by 4
1 2 3 4
ON
OFF 5
D
1D 4A TR TN E
1 2 3 4
ON
OFF 5
D
1D 4A TR TN E
1 2 3 4
ON
OFF 5
D
1D 4A TR TN E

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CARD SETUP, CONTINUED
Baud Rates and Divisors for the ‘Div1’ mode
The following table shows some common data rates and the rates you should choose to achieve them if
using the adapter in the ‘Div1’ mode. Windows 95/98/ME/2000/NT/XP defaults the oscillator value to
1.8432 MHz (Div4). This is suitable for traditional serial communication needs and provides for a maximum
data rate of 115.2 Kbps. The oscillator value 7.3728 MHz (Div1) may be entered into either the ‘Advanced
Tab’ on 95/98/Me/2000/XP Device Manager applet or in the ‘Advanced Ports’ applet in the NT Control
Panel. This will allow easy selection of typical baud rates up to the maximum data rate of 460.8Kbps.
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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CARD SETUP, CONTINUED
Address and IRQ selection
The ULTRA 485.OPTO22 is automatically assigned resources by your motherboard BIOS and or the
operating system.
Adding or removing other hardware or moving the adapter to a different PCI slot may change the
assignment of I/O addresses and IRQs.
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 1K-ohm pull-up/pull-down
combination that biases the receiver inputs. Switch SW1 allows customization of this interface to specific
requirements. Each switch position corresponds to a specific portion of the interface. If multiple
ULTRA 485.OPTO22 adapters are configured in an RS-485 network, only the boards on each end should
have switches T, P & P ON. Refer to the following table for each position’s operation:
Name
Function
T
Adds or removes the 120 ohm termination.
P
Adds or removes the 1K ohm pull-down resistor in the RS-
422/RS-485 receiver circuit (Receive data only).
P
Adds or removes the 1K ohm pull-up resistor in the RS-
422/RS-485 receiver circuit (Receive data only).
L
Connects the TX+ to RX+ for RS-485 two-wire operation.
L
Connects the TX- to RX- for RS-485 two-wire operation.
Figure 4 - Switch SW1, Line Termination
1 2 3 4
ON
OFF 5
P P T L L

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SeaCOM Software Installation
Windows 98/ME/2000/XP/Vista™ Operating Systems
Operating System Installation
For Windows Users
Begin by locating, selecting, and installing the SeaCOM software from the Sealevel software driver database.
SeaCOM software can also be downloaded from the 7105-DB9-product webpage: Ultra 485.Opto22
Other Operating Systems
Refer to the appropriate section of the Serial Utilities Software.
LINUX INSTALLATION
Refer to Linux Archives - Sealevel. This link contains valuable information on installing your serial
adapter in the various Linux releases. Also included is a series of files explaining proper Linux syntax and
typical Linux serial implementations. The SeaCOM for Linux v7.3.2 can be downloaded from Sealevel’s
website (Software: SeaCOM - Linux - Sealevel).
For additional software support, please call Sealevel Systems’ Technical Support, [phone]. Our
technical support is free and available from 8:00AM-5PM Eastern Time, Monday through Friday. For
email support contact: mailto:sup[email protected]om.
To install Sealevel Systems software, you must log in as an administrator or have administrator
privileges in Windows.

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Hardware Installation
The adapter can be installed in any 5V PCI expansion slot.
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 PC case cover.
3. Locate an available 5V PCI slot and remove the blank metal slot cover.
4. Gently insert the PCI adapter into the slot. Make sure that the adapter is seated properly.
5. After the adapter has been installed, the cables should be routed thru the opening in the
bracket. This bracket also features a strain relief function that should be used to prevent un-
expected cable removal.
6. Replace the screw you removed for the blank and use it to secure the adapter into the slot.
(This is required to ensure FCC Part 15 compliance.)
7. Replace the cover.
8. Connect the power cord
Installation is finished.

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Technical Description
The Sealevel Systems ULTRA 485.OPTO22 provides an additional asynchronous serial port, field
selectable as RS-422/485 for industrial automation and control applications.
The ULTRA 485.OPTO22 utilizes the EXAR 16C850 UART. This chip features programmable baud rates,
data format, interrupt control and industry leading 128-byte FIFOs.
Connector Assignments
RS-422/485 Pin Assignments
Signal
Name
Pin #
Mode
GND
Ground
3
RDB
RX+
Receive Positive
8
Input
RDA
RX-
Receive Negative
9
Input
CTSB
CTS+
Clear To Send Positive
6
Input
CTSA
CTS-
Clear To Send Negative
7
Input
TDB
TX+
Transmit Positive
4
Output
TDA
TX-
Transmit Negative
5
Output
RTSB
RTS+
Request To Send Positive
1
Output
RTSA
RTS-
Request To Send Negative
2
Output

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Specifications
Environmental Specifications
Specification
Operating
Storage
Temperature Range
0º to 70º C (32º to 122ºF)
-20º to 70º C (-4º to 158º F)
Humidity Range
10 to 90% R.H. Non-Condensing
10 to 90% R.H. Non-Condensing
Manufacturing
All Sealevel Systems Printed Circuit boards are built to U. L. 94V0 rating and are 100% electrically tested.
These printed circuit boards are solder mask over bare copper or solder mask over tin nickel.
Power Requirements
Supply Line
+5 VDC
Rating
325 mA
Physical Dimensions
Board length
4.9 inches (12.446 cm)
Board Height including Goldfingers
2.80 inches (7.112 cm)
Board Height excluding Goldfingers
2.475 inches (6.287cm)

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Appendix A –Troubleshooting
Sealevel Software is supplied with the Sealevel Systems adapter and will be used in the troubleshooting
procedures. By using this software and following these simple steps, most common problems can be
eliminated without the need to call Technical Support.
1. Identify all I/O adapters currently installed in your system. This includes your on-board
serial ports, controller cards, sound cards etc. The I/O addresses used by these adapters,
as well as the IRQ (if any) should be identified.
2. Configure your Sealevel Systems adapter so that there is no conflict with currently
installed adapters. No two adapters can occupy the same I/O address.
3. Make sure the Sealevel Systems adapter is using a unique IRQ. While the Sealevel
Systems adapter does allow the sharing of IRQs, many other adapters (i.e., SCSI adapters
& on-board serial ports) do not. The IRQ is typically selected by the BIOS or Operating
system. Some BIOS setup software will allow changing the IRQ, but others do not. Another
method of changing assigned resources is to try changing PCI slots. This will typically
cause the BIOS or OS to reassign the resources.
4. Make sure the Sealevel Systems adapter is securely installed in a motherboard slot.
5. When running DOS or Windows 3.x refer to the supplied Sealevel Software and this User
Manual to verify that the Sealevel Systems adapter is configured correctly. This software
contains a diagnostic program ‘SSD’ which will verify if an adapter is configured properly.
This diagnostic program is written with the user in mind and is easy to use.
6. For Windows95/98/ME/NT/2000, the diagnostic tool ‘WinSSD’ is installed in the SeaCOM
folder on the Start Menu during the setup process. First find the ports using the Device
Manager, then use ‘WinSSD’ to verify that the ports are functional. Refer to the WinSSD
Software Utility Overview.
7. Remember that a loopback test is not possible with the ‘NE’ switch turned on.
8. Always use the Sealevel Systems diagnostic software when troubleshooting a problem.
This will eliminate any software issues from the equation.
If these steps do not solve your problem, please call Sealevel Systems’ Technical Support, [phone].
Our technical support is free and available from 8:00 AM to 5:00 PM Eastern Time Monday through Friday.
For email support, contact su[email protected].

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Appendix B –How To Get Assistance
Please refer to: Appendix A -- Troubleshooting Guide prior to calling Technical Support.
Begin by reading through the Trouble Shooting Guide in Appendix A. If assistance is still
needed, please see below.
When calling for technical assistance, please have your user manual and current adapter
settings. If possible, please have the adapter installed in a computer ready to run diagnostics.
Sealevel Systems provides an FAQ section on its web site. Please refer to this to answer many
common questions. This section can be found at http://www.sealevel.com/faq.asp.
Sealevel Systems maintains a web page on the Internet. Our home page address
is www.sealevel.com. The latest software updates, and newest manuals are available via our
web site.
Technical support is available Monday to Friday from 8:00 a.m. to 5:00 p.m. eastern time.
Technical support can be reached at [phone].
RETURN AUTHORIZATION MUST BE OBTAINED FROM SEALEVEL SYSTEMS BEFORE RETURNED
MERCHANDISE WILL BE ACCEPTED. AUTHORIZATION CAN BE OBTAINED BY CALLING SEALEVEL
SYSTEMS AND REQUESTING A RETURN MERCHANDISE AUTHORIZATION (RMA) NUMBER.

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Appendix C –Electrical Interfaces
RS-422
The RS-422 specification defines the electrical characteristics of balanced voltage digital interface circuits.
RS-422 is a differential interface that defines voltage levels and driver/receiver electrical specifications. On
a differential interface, logic levels are defined by the difference in voltage between a pair of outputs or
inputs. In contrast, a single ended interface, for example RS-232, defines the logic levels as the difference
in voltage between a single signal and a common ground connection. Differential interfaces are typically
more immune to noise or voltage spikes that may occur on the communication lines. Differential interfaces
also have greater drive capabilities that allow for longer cable lengths. RS-422 is rated up to 10 Megabits
per second and can have cabling 4000 feet long. RS-422 also defines driver and receiver electrical
characteristics that will allow 1 driver and up to 32 receivers on the line at once. RS-422 signal levels range
from 0 to +5 volts. RS-422 does not define a physical connector.
RS-485
RS-485 is backwardly compatible with RS-422; however, it is optimized for party line or multi-drop
applications. The output of the RS-422/485 driver is capable of being Active (enabled) or Tri-State
(disabled). This capability allows multiple ports to be connected in a multi-drop bus and selectively polled.
RS-485 allows cable lengths up to 4000 feet and data rates up to 10 Megabits per second. The signal levels
for RS-485 are the same as those defined by RS-422. RS-485 has electrical characteristics that allow for 32
drivers and 32 receivers to be connected to one line. This interface is ideal for multi-drop or network
environments. RS-485 tri-state driver (not dual-state) will allow the electrical presence of the driver to be
removed from the line. Only one driver may be active at a time and the other driver(s) must be tri-stated.
RS-485 can be cabled in two ways, two wire and four wire mode. Two wire mode does not allow for full
duplex communication and requires that data be transferred in only one direction at a time. For half-duplex
operation, the two transmit pins should be connected to the two receive pins (Tx+ to Rx+ and Tx- to Rx-).
Four wire mode allows full duplex data transfers. RS-485 does not define a connector pin-out or a set of
modem control signals. RS-485 does not define a physical connector.

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Appendix D –Asynchronous Communications
Serial data communications implies that individual bits of a character are transmitted consecutively to a
receiver that assembles the bits back into a character. Data rate, error checking, handshaking, and
character framing (start/stop bits) are pre-defined and must correspond at both the transmitting and
receiving ends.
Asynchronous communications is the standard means of serial data communication for PC compatibles
and PS/2 computers. The original PC was equipped with a communication or COM: port that was designed
around an 8250 Universal Asynchronous Receiver Transmitter (UART). This device allows asynchronous
serial data to be transferred through a simple and straightforward programming interface. A start bit,
followed by a pre-defined number of data bits (5, 6, 7, or 8) defines character boundaries for asynchronous
communications. The end of the character is defined by the transmission of a pre-defined number of stop
bits (usually 1, 1.5 or 2). An extra bit used for error detection is often appended before the stop bits.
Asynchronous Communications Bit Diagram
This special bit is called the parity bit. Parity is a simple method of determining if a data bit has been lost
or corrupted during transmission. There are several methods for implementing a parity check to guard
against data corruption. Common methods are called (E)ven Parity or (O)dd Parity. Sometimes parity is not
used to detect errors on the data stream. This is referred to as (N)o parity. Because each bit in
asynchronous communications is sent consecutively, it is easy to generalize asynchronous
communications by stating that each character is wrapped (framed) by pre-defined bits to mark the
beginning and end of the serial transmission of the character. The data rate and communication
parameters for asynchronous communications have to be the same at both the transmitting and receiving
ends. The communication parameters are baud rate, parity, number of data bits per character, and stop bits
(i.e., 9600, N, 8, 1).

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Appendix E –SILK SCREEN
2.8"
4.9"

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Appendix F –Compliance Notices
Federal Communications Commission (FCC) Statement
This equipment has been tested and found to comply with the limits for Class A digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable
protection against harmful interference when the equipment is operated in a commercial
environment. This equipment generates, uses, and can radiate radio frequency energy and,
if not installed and used in accordance with the instruction manual, may cause harmful
interference to radio communications. Operation of this equipment in a residential area is
likely to cause harmful interference in such case the user will be required to correct the
interference at the user’s expense.
EMC Directive Statement
Products bearing the CE Label fulfill the requirements of the EMC directive (89/336/EEC)
and of the low-voltage directive (73/23/EEC) issued by the European Commission. To obey
these directives, the following European standards must be met:
•EN55022 Class A - “Limits and methods of measurement of radio interference
characteristics of information technology equipment”
•EN55024 –“Information technology equipment Immunity characteristics Limits
and methods of measurement”.
This is a Class A Product. In a domestic environment, this product may cause radio interference in
which case the user may be required to take adequate measures to prevent or correct the
interference.
Always use cabling provided with this product if possible. If no cable is provided or if an alternate
cable is required, use high quality shielded cabling to maintain compliance with FCC/EMC
directives.

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Warranty
Sealevel's commitment to providing the best I/O solutions is reflected in the Lifetime Warranty that is
standard on all Sealevel manufactured I/O products. We are able to offer this warranty due to our control
of manufacturing quality and the historically high reliability of our products in the field. Sealevel products
are designed and manufactured at its Liberty, South Carolina facility, allowing direct control over product
development, production, burn-in and testing. Sealevel achieved ISO-9001:2015 certification in 2018.
Warranty Policy
Sealevel Systems, Inc. (hereafter "Sealevel") warrants that the Product shall conform to and perform in
accordance with published technical specifications and shall be free of defects in materials and
workmanship for the warranty period. In the event of failure, Sealevel will repair or replace the product at
Sealevel's sole discretion. Failures resulting from misapplication or misuse of the Product, failure to adhere
to any specifications or instructions, or failure resulting from neglect, abuse, accidents, or acts of nature
are not covered under this warranty.
Warranty service may be obtained by delivering the Product to Sealevel and providing proof of purchase.
Customer agrees to ensure the Product or assume the risk of loss or damage in transit, to prepay shipping
charges to Sealevel, and to use the original shipping container or equivalent. Warranty is valid only for
original purchaser and is not transferable.
This warranty applies to Sealevel manufactured Product. Product purchased through Sealevel but
manufactured by a third party will retain the original manufacturer's warranty.
Non-Warranty Repair/Retest
Products returned due to damage or misuse and Products retested with no problem found are subject to
repair/retest charges. A purchase order or credit card number and authorization must be provided in order
to obtain an RMA (Return Merchandise Authorization) number prior to returning Product.
How to obtain an RMA (Return Merchandise Authorization)
If you need to return a product for warranty or non-warranty repair, you must first obtain an RMA number.
Please contact Sealevel Systems, Inc. Technical Support for assistance:
Available Monday –Friday, 8:00AM to 5:00PM EST
Phone [phone]
Email [email protected]
Trademarks
Sealevel Systems, Incorporated acknowledges that all trademarks referenced in this manual are the service
mark, trademark, or registered trademark of the respective company.