ULTRA 530.PCI
Users Manual
Part # 7101
Sealevel Systems, Inc.
PO Box 830
Liberty, SC 29657 USA
Telephone: 864.843.4343
Fax: 864.843.3067
www.sealevel.com
Contents
INTRODUCTION ..........................................................................................................................1
OVERVIEW ................................................................................................................................................1
WHAT’S INCLUDED ...................................................................................................................................1
CARD SETUP ..............................................................................................................................2
RS-485 ENABLE MODES ...........................................................................................................................2
ADDRESS AND IRQ SELECTION .................................................................................................................4
LINE TERMINATION ...................................................................................................................................5
ELECTRICAL INTERFACE SELECTION .........................................................................................................6
CLOCK MODES ..........................................................................................................................................7
BAUD RATES AND DIVISORS FOR THE ‘DIV1’ MODE ..................................................................................8
ISOCHRONOUS CLOCKING JUMPERS ..........................................................................................................9
INSTALLATION .........................................................................................................................11
OPERATING SYSTEM INSTALLATION ........................................................................................................11
WINDOWS 95/98/ME/NT/2000/XP.........................................................................................................11
LINUX .....................................................................................................................................................11
QNX .......................................................................................................................................................11
PHYSICAL INSTALLATION ........................................................................................................................12
TECHNICAL DESCRIPTION ......................................................................................................13
CONNECTOR PIN ASSIGNMENTS ..............................................................................................................13
RS-232 Signals ....................................................................................................................................13
RS-422/485/530 Pin Assignments .......................................................................................................14
SPECIFICATIONS ......................................................................................................................15
ENVIRONMENTAL SPECIFICATIONS ..........................................................................................................15
MANUFACTURING ...................................................................................................................................15
POWER CONSUMPTION ............................................................................................................................15
PHYSICAL DIMENSIONS ...........................................................................................................................15
APPENDIX A - TROUBLESHOOTING ........................................................................................16
APPENDIX B - HOW TO GET ASSISTANCE ..............................................................................17
APPENDIX C - ELECTRICAL INTERFACE ................................................................................18
RS-232....................................................................................................................................................18
RS-422....................................................................................................................................................18
RS-485....................................................................................................................................................18
RS-530....................................................................................................................................................18
APPENDIX D - ASYNCHRONOUS COMMUNICATIONS ..............................................................19
APPENDIX E - SILK-SCREEN ...................................................................................................20
APPENDIX F - COMPLIANCE NOTICES ....................................................................................21
FEDERAL COMMUNICATIONS COMMISSION STATEMENT .........................................................................21
EMC DIRECTIVE STATEMENT .................................................................................................................21
WARRANTY ..............................................................................................................................22
©Sealevel Systems, Inc.
SL9160 Revision 7/2006
Sealevel Systems, Incorporated. All rights reserved.
Introduction
Introduction
Overview
The Sealevel Systems ULTRA 530.PCI is a one channel PCI Bus serial I/O adapter for the PC and compatibles. It
provides one field selectable RS-232/422/485/530 serial port supporting asynchronous data rates up to 460.8K bps
as well as isochronous data rates up to the speed of the supplied clock. Now, with this card, you can use your
standard communications software and connect over a clocked digital communications line.
Configure the port as RS-232 for standard serial COM: port requirements. 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 both RS-232 and RS-422 modes, the card works seamlessly with the standard operating system serial driver. 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. UART upgrades are available providing 32, 64 and 128
byte FIFOs.
What’s Included
The ULTRA 530.PCI is shipped with the following items. If any of these items are missing or damaged, contact the
supplier.
• ULTRA 530.PCI Serial I/O Adapter
• Sealevel SeaCOM Software CD
Sealevel Systems ULTRA 530.PCI
Page 1
Card Setup
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 530.PCI is the ability to be RS-485 compatible without the need for
special software or drivers. This ability is especially useful in Windows, Windows NT, and OS/2 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 530.PCI in a RS-485 application with existing (i.e. standard RS-232) software drivers.
Header E4 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.
‘DTR’ enable (silk-screen ‘DT’) The ‘DTR’ mode uses the ‘DTR’ modem control signal to enable the RS-485
interface, provides backward compatibility with existing software products and with the Oxford Semiconductor
16C950 RS-485 enable feature
‘Output One’ enable (silk-screen ‘OP’) This mode uses the ‘OP1’ control signal to enable the RS-485 interface and
provides backward compatibility with existing software products and with the Exar 16C850 RS-485 enable feature
‘No Echo’ (silk-screen ‘NE’) of E4 is used to control the RS-485 enable/disable functions for the receiver circuit
and determine the state of the RS-422/485 driver. 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’.
Sealevel Systems ULTRA 530.PCI
Page 2
Card Setup
RS-485 Mode Examples (Header E4)
AT
RT
DT
OP
NE
Figure 1- Header E4, RS-422
AT
RT
DT
OP
NE
Figure 2 – Header E4, RS-485 ‘Auto’ Enabled, with ‘No Echo’
AT
RT
DT
OP
NE
Figure 3 - Header E4, RS-485 ‘Auto’ Enabled, with ‘Echo’
Sealevel Systems ULTRA 530.PCI
Page 3
Card Setup
RS-485 Mode Examples (Header E4) continued
AT
RT
DT
OP
NE
Figure 4 - Header E4, RS-485 ‘RTS’ Enabled, with ‘No Echo’
AT
RT
DT
OP
NE
Figure 5 – Header E4, RS-485 ‘RTS’ Enabled, with ‘Echo’
AT
RT
DT
OP
NE
Figure 6 – Header E4, RS-485 ‘DTR’ Enabled, with No Echo
Address and IRQ selection
The ULTRA 530.PCI is automatically assigned I/O addresses and IRQs by your motherboard BIOS. Only the I/O
address may be modified by the user.
Adding or removing other hardware may change the assignment of I/O addresses and IRQs.
Sealevel Systems ULTRA 530.PCI
Page 4
Card Setup
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. Header E4 allows customization of this interface to specific requirements. Each
jumper position corresponds to a specific portion of the interface. If multiple ULTRA 530.PCI adapters are
configured in a RS-485 network, only the boards on each end should have jumpers T, P & P ON. Refer to the
following table for each position’s operation:
Name
P
P
T
L
L
Function
Adds or removes the 1K ohm pull-down resistor in the
RS-422/RS-485 receiver circuit (Receive data only).
Adds or removes the 1K ohm pull-up resistor in the RS-422/RS485 receiver circuit (Receive data only).
Adds or removes the 120 ohm termination.
Connects the TX+ to RX+ for RS-485 two wire operation.
Connects the TX- to RX- for RS-485 two wire operation.
P P T L L
Figure 7 - Headers E3, Line Termination
Sealevel Systems ULTRA 530.PCI
Page 5
Card Setup
Electrical Interface Selection
Each port on the ULTRA 530.PCI has the ability to be used in either RS-232 or RS-422/485. This is selectable via
four 24 pin DIP-shunts at E1-E4. Please use the following illustration to aid in the configuration of your electrical
interface.
RS-232
RS-422
E1
E2
Figure 8 - Headers E1 & E2, RS-232 Selected
RS-232
E1
RS-422
E2
Figure 9 - Headers E1 & E2, RS-422/485 Selected
Sealevel Systems ULTRA 530.PCI
Page 6
Card Setup
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.
DIV1
DIV4
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 10 - Clocking Mode ‘Divide By 4’
DIV1
DIV4
To select the maximum data rate (460.8K bps) place the jumper in the divide by 1 (silk-screen DIV1) position.
Figure 11 - Clocking Mode ‘Divide By 1’
Sealevel Systems ULTRA 530.PCI
Page 7
Card Setup
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
1200 bps
2400 bps
4800 bps
9600 bps
19.2K bps
57.6 K bps
115.2 K bps
230.4K bps
460.8K bps
Choose this Data Rate
300 bps
600 bps
1200 bps
2400 bps
4800 bps
14.4K bps
28.8K bps
57.6 K 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
1200 bps
2400 bps
4800 bps
9600 bps
19.2K bps
38.4K bps
57.6K bps
115.2K bps
230.4K bps
460.8K bps
Sealevel Systems ULTRA 530.PCI
Choose this Divisor
384
192
96
48
24
12
8
4
2
1
Page 8
Card Setup
Isochronous Clocking Jumpers
The Oxford Semiconductor 16C950 allows for the reception of both the transmit and the receive clocks for
isochronous communications (for a discussion on isochronous clocking refer to the Technical Description section).
The three headers that allow the selection of either a modem control signal or the clock option are E5, E6 and E7.
The following examples describe each setting.
RXC
DSR
Figure 12 – Header E5, Modem Control Signal DSR selected as input
RXC
DSR
Figure 13 - Header E5, Clock Signal RXC selected as input
TXC
RI
Figure 14 - Header E6, Modem Control Signal RI selected as input
Sealevel Systems ULTRA 530.PCI
Page 9
Card Setup
Isochronous Clocking Jumpers (continued)
TXC
RI
Figure 15 - Header E6, Clock Signal TXC selected as input
DTR
TSET
Figure 16 - Header E7, Modem Control Signal DTR selected as output
DTR
TSET
Figure 17 - Header E7, Clock Signal TSET selected as output
Sealevel Systems ULTRA 530.PCI
Page 10
Installation
Installation
Operating System Installation
Windows 95/98/ME/NT/2000/XP
Do not install the Adapter in the machine until the software has been fully installed.
1.
Start Windows.
2.
Insert the Sealevel Systems CD in to your CD drive.
3.
If ‘Auto-Start’ is enabled for this drive the software will automatically launch. Otherwise, point your
browser to the ‘Index.htm’ on the root directory of the CD
4.
Select ‘Install Software’.
5.
Select the Part Number for your adapter from the listing.
6.
Select ‘Windows 98/ME/2000/XP’. The setup file will automatically detect the operating environment and
install the proper components. Next (depending on the OS version) select the ‘Run this program from its
current location’ or ‘Open’ option. Follow the information presented on the screens that follow.
7.
A screen may appear with the declaration: “The publisher cannot be determined due to the problems below:
Authenticode signature not found.” Please select 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.
8.
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.
Linux
Refer to D:\software\seacom\Other\Linux\Linux.serial.readme (where D: = your CDROM driver letter) found on
the Sealevel Systems CD. This file contains valuable information on installing your adapter in the various Linux
releases. Also in this sub-directory is the Linux SerialHOWTO. This series of files explains typical Linux serial
implementations, as well as informing the user to Linux syntax and preferred practices.
QNX
Refer to D:\software\seacom\Other\QNX6\Install.readme (where D: = your CDROM driver letter) found on the
Sealevel Systems CD. This file contains valuable information on installing your adapter in the QNX6 Neutrino OS,
as well as the files required to ensure a flawless implementation. Also provided on the Sealevel Systems CD are
implementation instructions for QNX4. These are found in D:\software\seacom\Other\QNX4\QNX_COM.txt.
Sealevel Systems ULTRA 530.PCI
Page 11
Installation
Physical Installation
The adapter can be installed in any 5V PCI expansion slot and contains several jumper straps for each port that must
be set for proper.
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 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.
Replace the screw. (This is required to ensure FCC Part 15 compliance.)
6.
Replace the cover.
7.
Connect the power cord
Installation is finished.
Sealevel Systems ULTRA 530.PCI
Page 12
Technical Description
Technical Description
The Sealevel Systems ULTRA 530.PCI provides a PCI interface adapter with an additional asynchronous serial port
providing a versatile interface, field selectable as RS-232 for modems, printers and plotters, as well as
RS-422/485/530 for industrial automation and control applications.
The ULTRA 530.PCI utilizes the 16550 UART. This chip features programmable baud rates, data format, interrupt
control and a 16-byte input and output FIFO. Also available, as options, are the 16C650, 16C750 and 16C850
UART’s that provide deeper FIFO’s (32, 64, 128 bytes respectively).
One other unique feature of the ULTRA 530.PCI is the support for the Oxford Semiconductor 16C950. This chip
features a deep FIFO (128 bytes transmit and receive), automatic RS-485 driver enable, and the ability to receive a
clock for isochronous communications.
Isochronous Communications
Webster's New Collegiate Dictionary defines synchronous as "recurring or operating at exactly the same period."
The majority of the serial buses in use today operate asynchronously, that is, "not synchronous" or more literally, not
clocked. The same dictionary defines isochronous as "uniform in time; having equal duration; and recurring at
regular intervals." In this implementation of serial communications, isochronous is defined as asynchronous framing
(i.e. start, stop and parity bits) with the addition of a clock signal. This scheme allows for much higher data rates and
the use of digital lines (i.e. ISDN, T1) where a clock is supplied for data multiplexing.
Why is this exciting? Now, with a simple communications interface that responds to standard communication calls,
high-speed communications can be accomplished! For example: Company A wishes to send daily reports from the
London office to it’s New York office via an established satellite link. These links typically require a clock to
synchronize data. In the past, more expensive synchronous interface adapter and custom software would be required.
Now, utilizing the ULTRA 530.PCI interface adapter with the Oxford Semiconductor 16C950 UART, an off the
shelf product such as PROCOMM PLUS32 or Symantec’s PCANYWHERE32 can be utilized, at much higher data
rates than are possible via dialup services.
Connector Pin Assignments
RS-232 Signals
Signal
GND
RD
CTS
DSR
TXC
RXC
DCD
RI
TD
RTS
TSET
DTR
Name
Ground
Receive Data
Clear To Send
Data Set Ready
Transmit Clock
Receive Clock
Data Carrier. Detect
Ring Indicator
Transmit Data
Request to Send
Transmit Signal Element Timing
Data Terminal Ready
Sealevel Systems ULTRA 530.PCI
Pin #
7
3
5
6
15
17
8
22
2
4
24
20
Mode
Input
Input
Input
Input
Input
Input
Input
Output
Output
Output
Output
Page 13
Technical Description
RS-422/485/530 Pin Assignments
Signal
GND
RDB
RDA
CTSB
CTSA
DSRB
DSRA
DCDB
DCDA
TDB
TDA
RTSB
RTSA
DTRB
DTRA
TXCB
TXCA
RXCB
RXCA
TSETB
TSETA
RX+
RXCTS+
CTSDSR+
DSRDCD+
DCD
TX+
TXRTS+
RTSDTR+
DTRTXC+
TXCRXC+
RXCTSET+
TSET-
Name
Ground
Receive Positive
Receive Negative
Clear To Send Positive
Clear To Send Negative
Data Set Ready Positive
Data Set Ready Negative
Data Carrier Detect Positive
Data Carrier Detect Negative
Transmit Positive
Transmit Negative
Request To Send Positive
Request To Send Negative
Data Terminal. Ready Positive
Data Terminal Ready Negative
Transmit Clock Positive
Transmit Clock Negative
Receive Clock Positive
Receive Clock Negative
Terminal Timing Positive
Terminal Timing Negative
Pin #
7
16
3
13
5
22
6
10
8
14
2
19
4
23
20
12
15
9
17
11
24
Mode
Input
Input
Input
Input
Input
Input
Input
Input
Output
Output
Output
Output
Output
Output
Input
Input
Input
Input
Output
Output
Note: These assignments meet the EIA/TIA/ANSI-530 DTE specification with the exception of Ring Indicator
which is not specified. It has been included here for compatibility with systems requiring Ring Indicator. Always
terminate any unused signals. This allows for maximum data thru-put.
Sealevel Systems ULTRA 530.PCI
Page 14
Specifications
Specifications
Environmental Specifications
Specification
Temperature
Range
Humidity Range
Operating
0º to 70º C
(32º to 158º F)
10 to 90% R.H.
Non-Condensing
Storage
-50º to 105º C
(-58º to 221º F)
10 to 90% R.H.
Non-Condensing
Manufacturing
All Sealevel Systems Printed Circuit boards are built to UL 94V0 rating and are 100% electrically tested. These
printed circuit boards are solder mask over bare copper or solder mask over tin nickel.
Power Consumption
Supply line
Rating
+12VDC
50 mA
-12VDC
50 mA
+5 VDC
480 mA
4.9 inches
3.5 inches
3.175 inches
(12.446 cm)
(8.89 cm)
(8.064 cm)
Physical Dimensions
Board length
Board Height including Goldfingers
Board Height excluding Goldfingers
Sealevel Systems ULTRA 530.PCI
Page 15
Appendix A - Troubleshooting
Appendix A - Troubleshooting
Sealevel Software is supplied with the Sealevel Systems adapter and may be used in the troubleshooting procedures.
Using this software and following these simple steps can eliminate most common problems 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’
(D:\software\seacom\Other\DOS\DIAG, where D: = the driver letter of your CDROM drive) will verify if an
adapter is configured properly. This diagnostic program is written with the user in mind and is easy to use. You
can use D:\software\seacom\Other\DOS\PCI\FindPCI.exe to determine resources that have been assigned to
your adapter. Make sure that if available, the ‘Use Plug-n-Play” option is turned ‘OFF’ in your BIOS. Having
this option set to ‘ON’ in DOS or Windows 3.x will cause erratic operations.
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.
7.
Remember that a loopback test is not possible with the ‘NE’ jumper in place.
8.
Always use the Sealevel Systems diagnostic software when troubleshooting a problem. This will eliminate any
software issues from the equation.
Sealevel Systems ULTRA 530.PCI
Page 16
Appendix B - How To Get Assistance
Appendix B - How To Get Assistance
Please refer to Troubleshooting Guide prior to calling Technical Support.
1.
Begin by reading through the Trouble Shooting Guide in Appendix A. If assistance is still needed
please see below.
2.
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.
3.
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.
4.
Sealevel Systems maintains a web page on the Internet. Our home page address is
http://www.sealevel.com. The latest software updates, and newest manuals are available via our web
site.
5.
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 (864) 843-4343.
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.
Sealevel Systems ULTRA 530.PCI
Page 17
Appendix C – Electrical Interface
Appendix C - Electrical Interface
RS-232
Quite possibly the most widely used communication standard is RS-232. This implementation has been defined and
revised several times and is often referred to as RS-232 or EIA/TIA-232. RS-232 is capable of operating at data rates
up to 20 Kbps at distances less than 50 ft. The absolute maximum data rate may vary due to line conditions and cable
lengths. RS-232 is a single ended or unbalanced interface, meaning that a single electrical signal is compared to a
common signal (ground) to determine binary logic states. The RS-232 and the EIA/TIA-574 specification define two
types of interface circuits, Data Terminal Equipment (DTE) and Data Circuit-Terminating Equipment (DCE). The
ULTRA 530.PCI is a DTE device.
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 partyline 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.
RS-530
RS-530 (a.k.a. EIA-530) compatibility means that RS-422 signal levels are met, and the pin-out for the DB-25
connector is specified. The EIA (Electronic Industry Association) created the RS-530 specification to detail the
pin-out, and define a full set of modem control signals that can be used for regulating flow control and line status.
The RS-530 specification defines two types of interface circuits, Data Terminal Equipment (DTE) and Data CircuitTerminating Equipment (DCE). The Sealevel Systems adapter is a DTE interface.
Sealevel Systems ULTRA 530.PCI
Page 18
Appendix D - Asynchronous Communications
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.
Idle state of
line
5 to 8 Data Bits
Odd, Even
or
Unused
Remain Idle or
next start bit
1
P
BIT
STOP
0
1
1.5
2
Figure 18 - 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 refereed 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
Appendix E - Silk-Screen
3.5"
4.9"
3.175"
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Appendix F - Compliance Notices
Appendix F - Compliance Notices
Federal Communications Commission Statement
FCC - 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 users 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”.
EN60950 (IEC950) - “Safety of information technology equipment, including electrical business
equipment”
Warning
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
Warranty
Sealevel's commitment to providing the best I/O solutions is reflected in the Lifetime
Warranty that is standard on all Sealevel manufactured 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 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 life. 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 or abuse are not covered under this warranty.
Warranty service is obtained by delivering the Product to Sealevel and providing proof of purchase. Return
authorization must be obtained from Sealevel Systems before returned merchandise will be accepted.
Authorization is obtained by calling Sealevel Systems and requesting a Return Merchandise Authorization
(RMA) number. The Customer agrees to insure 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.
Sealevel Systems assumes no liability for any damages, lost profits, lost savings or any other incidental or
consequential damage resulting from the use, misuse of, or inability to use this product. Sealevel Systems will not be
liable for any claim made by any other related party.
This warranty applies to Sealevel manufactured Product. Product purchased through Sealevel but manufactured by a
third party will retain the original manufacturer's warranty.
Sealevel Systems, Incorporated
2779 Greenville Highway
P.O. Box 830
Liberty, SC 29657 USA
(864) 843-4343 FAX: (864) 843-3067
www.sealevel.com
email: support@sealevel.com
Technical Support is available from 8 a.m. to 5 p.m. Eastern time.
Monday - Friday
Trademarks
Sealevel Systems, Incorporated acknowledges that all trademarks referenced in this manual are the service mark,
trademark, or registered trademark of the respective company.
ULTRA 530.PCI is a trademark of Sealevel Systems, Incorporated.
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