SeaLevel SIO-530 User manual

SIO-530™
USER’S MANUAL
Part Number 3063
Sealevel Systems, Inc Phone: [phone]
155 Technology Place Fax: [phone]
P.O. Box 830 www.sealevel.com
Liberty, SC 29657

Contents
INTRODUCTION.........................................................................1
OVERVIEW................................................................................................1
WHAT’S INCLUDED.................................................................................1
FACTORY DEFAULT SETTINGS.............................................................1
CARD SETUP..............................................................................2
PORT ENABLE / DISABLE.......................................................................3
IRQ SELECTION.......................................................................................3
INTERFACE SELECTION.........................................................................4
E2 JUMPER SETTINGS..............................................................................4
E1 Jumper setting for RS-232.................................................................5
E1 Jumper setting for RS-530 and RS-422.............................................6
E1 Jumper setting for RS-485.................................................................7
E1 Jumper setting for 20 mA Current Loop...........................................8
INSTALLATION...........................................................................9
TECHNICAL DESCRIPTION .......................................................10
CONNECTOR PIN ASSIGNMENTS.........................................................11
RS-232..................................................................................................11
RS-530/422/485....................................................................................11
RS-530/422/485 Line Termination........................................................11
20 mA Current Loop............................................................................12
CURRENT LOOP CONNECTIONS..........................................................12
Passive Connection...............................................................................12
Active Connection................................................................................12
SPECIFICATIONS......................................................................13
ENVIRONMENTAL SPECIFICATIONS...................................................13
MANUFACTURING.................................................................................13
POWER CONSUMPTION........................................................................13
MEAN TIME BETWEEN FAILURES (MTBF)......................................13
PHYSICAL DIMENSIONS........................................................................13
APPENDIX A -TROUBLESHOOTING..........................................14
APPENDIX B -HOW TO GET ASSISTANCE...............................16
APPENDIX C -ELECTRICAL INTERFACE....................................17
RS-232......................................................................................................17
RS-422......................................................................................................17
RS-530......................................................................................................18
RS-485......................................................................................................18

20 MA CURRENT LOOP.........................................................................19
APPENDIX D -ASYNCHRONOUS COMMUNICATIONS ................20
APPENDIX E -SILK-SCREEN......................................................21
APPENDIX F -SCHEMATIC ........................................................22
APPENDIX G -COMPLIANCE NOTICES......................................23
COMPLIANCE NOTICES ..........ERROR! BOOKMARK NOT DEFINED.
FEDERAL COMMUNICATIONS COMMISSION STATEMENT.............23
EMC DIRECTIVE STATEMENT............................................................23
WARRANTY ..............................................................................24
Figures
Figure 1 -Address Selection Table........................................................................2
Figure 2 -DIP-Switch Illustration.........................................................................2
Figure 3 -Header E2 and E3, IRQ Selection........................................................3
Figure 4 -Header E2 options..................................................................................4
Figure 5 -Header E1 RS-232 Interface Selected..................................................5
Figure 6 -Header E1 RS-530/422 Interface Selected...........................................6
Figure 7 -Header E1 RS-485 Interface Selected..................................................7
Figure 8 -Header E1 20 mA Current Loop Interface Selected...........................8
Figure 9 -Asynchronous Communications Bit Diagram..................................20
© 1996j Sealevel Systems, Incorporated. All rights reserved.

Introduction
Sealevel Systems SIO-530 Page 1
Introduction
Overview
The SIO-530 provides the PC with one asynchronous serial port which can
interface to RS-232, RS-422, RS-485, and 20 mA Current Loop devices.
What’s Included
The SIO-530 is shipped with the following items. If any of these items are missing
or damaged, contact the supplier.
•SIO-530 Serial I/O Adapter
•3.5” Serial Utility Diskette
•User Manual
Factory Default Settings
The SIO-530 factory default settings are as follows:
Base Address IRQ Electrical Specification
3F8 4RS-232
To install the SIO-530 using factory default settings, refer to Installation on page 9.
For your reference, record installed SIO-530 settings below:
Base Address IRQ Electrical Specification

Card Setup
Sealevel Systems SIO-530 Page 2
Card Setup
The SIO-530 contains several jumper straps which must be set for proper
operation.
The SIO-530 occupies 8 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-530.
Address Binary Switch Position Setting
Hex A9 A0 1234567
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.
ON
1 2 3 4 5 6 7 8
ENA3A9
Figure 2-DIP-Switch Illustration
Note: Setting the switch “On” or “Closed” corresponds to a “0” in the address,
while leaving it “Off” or “Open” corresponds to a “1”.
Refer to Appendix A for common address contentions.

Card Setup
Sealevel Systems SIO-530 Page 3
Port Enable / Disable
Each port on the SIO-530 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”. If any port is disabled, be sure to disable the interrupt
request for that port by removing the IRQ jumper.
IRQ Selection
Header E3 selects the interrupt request for the serial port. If COM1: is selected,
this jumper must be on the IRQ4 setting. If COM2: is selected, this jumper must be
on IRQ3. Consult your particular software for IRQ selection. If no interrupt is
desired, remove the jumper.
M N 7 5 4 3 2
E3
Figure 3-Header E2 and E3, IRQ Selection
Position “M” & “N” allow the user to select a single interrupt per port mode or a
shared interrupt mode. The “N” selects the single interrupt per port mode, which is
the typical DOS, OS/2 and Windows 3.1 mode of operation. The “M” selects the
shared interrupt mode, which allows more than one port to access a single IRQ, and
indicates the inclusion of a 1K ohm pull-down resistor required on one port when
sharing interrupts. This mode is used by software that requires COM3: and
COM4: to share interrupts with COM1: and COM2: or in an OEM configuration
to support a specific software application.
Note: Most communications software applications default COM3: to IRQ4 and
COM4: to IRQ3. This requires the sharing of interrupts between COM1:
and COM3:, and between COM2: and COM4:. While this is the default, it
is not always the preferred setting. Check your software configuration
instructions to determine the most appropriate IRQ selection.
Note: The actual Silk-Screen for the SIO-530 may have a “2” in place of the IRQ
“2/9” selection.

Card Setup
Sealevel Systems SIO-530 Page 4
Interface Selection
Headers E1 and E2 connect the DB-25 connector (P1) to either RS-232 interface
drivers / receivers, RS-422/485 interface drivers / receivers or to the Current Loop
receiver interface.
Note: On E2 you must move all eight push-on jumpers. This is required to
completely isolate RS-232 signals from RS-422/485 and vice-versa. On E1,
however, there are several jumper options.
E2 jumper settings
E2
E2
E2
RS-232
RS-530/422/485
20 mA Current Loop
Figure 4-Header E2 options

Card Setup
Sealevel Systems SIO-530 Page 5
E1 Jumper setting for RS-232
BA
GND
EN
CL
RI
CTS
DSR
RD
DCD
E1
Figure 5-Header E1 RS-232 Interface Selected
GND Ground “A” selects normal ground for RS-232.
EN Enable “A” (Not Applicable to RS-232).
CL Current Loop “A” selects RS-232 Receive Data.
RI Ring Indicator “A” enables RI, “B” sets it true.
DCD Data Carrier Detect “A” selects RS-232.
DSR Data Set Ready “A” selects RS-232.
CTS Clear To Send “A” selects RS-232.
RD Receive Data “A” selects RS-232.

Card Setup
Sealevel Systems SIO-530 Page 6
E1 Jumper setting for RS-530 and RS-422
BA
GND
EN
CL
RI
CTS
DSR
RD
DCD
E1
Figure 6-Header E1 RS-530/422 Interface Selected
GND Ground “B” selects 100 Ohm ground for RS-530/422.
EN Enable “A” position for RS-530.
CL Current Loop “A” selects RS-530 Receive Data.
RI Ring Indicator (not used on RS-530) “B” sets it true.
DCD Data Carrier Detect “B” selects RS-530.
DSR Data Set Ready “B” selects RS-530.
CTS Clear To Send “B” selects RS-530.
RD Receive Data “B” selects RS-530.

Card Setup
Sealevel Systems SIO-530 Page 7
E1 Jumper setting for RS-485
BA
GND
EN
CL
RI
CTS
DSR
RD
DCD
E1
Figure 7-Header E1 RS-485 Interface Selected
GND Ground “B” selects 100 Ohm ground for RS-485.
EN Enable driver with RTS “B” .”A” is always enabled.
CL Current Loop “A” selects RS-485 Receive Data.
RI Ring Indicator not used on RS-485 “B” sets it true.
DCD Data Carrier Detect “B” selects RS-485.
DSR Data Set Ready “B” selects RS-485.
CTS Clear To Send “B” selects RS-485.
RD Receive Data “B” selects RS-485.
E1 position “EN” is used to enable the driver with RTS. To permanently enable the
driver (normal RS-422 point to point mode) remove jumper “EN” at E1. Failure
to correctly set this jumper can cause transmitter contention problems,
preventing operation by any nodes on the network.
E1 position “GND” determines whether the board provides a direct ground
connection (as in RS-232 and most RS-422), or a 100 Ohm high impedance ground.
The 100 Ohm high impedance ground is normally used in RS-485 (and some RS-
422) to avoid ground loop currents with long cables.

Card Setup
Sealevel Systems SIO-530 Page 8
E1 Jumper setting for 20 mA Current Loop
BA
GND
EN
CL
RI
CTS
DSR
RD
DCD
E1
Figure 8-Header E1 20 mA Current Loop Interface Selected
GND Ground “A” selects normal ground for Current Loop.
EN N/A
CL Current Loop “B” selects Current Loop receive data.
RI Ring Indicator not used, “B” sets it true.
CD N/A
DSR N/A
CTS N/A
RD Receive Data -Remove or “Float” on one pin for Current Loop.

Installation
Sealevel Systems SIO-530 Page 9
Installation
The SIO-530 can be installed in any of the PC expansion slots, but to access the
“AT” or (E)ISA IRQ’s (10, 11, 12, 15) it must be installed in one of the 16 bit
slots. The SIO-530 contains several jumper straps for each port which must be set
for proper operation prior to installing the adapter into the computer.
1. Turn off PC power. Disconnect the power cord.
2. Remove the PC case cover.
3. Locate an available slot and remove the blank metal slot cover.
4. Gently insert the SIO-530 into the slot. Make sure that the adapter is seated
properly.
5. Replace the screw.
6. Replace the cover.
7. Connect the power cord.
Installation is complete.

Technical Description
Sealevel Systems SIO-530 Page 10
Technical Description
The SIO-530 provides one async serial port which can interface to RS-232, RS-
530, RS-422, RS-485, and 20 mA Current Loop.
Features include:
•DB-25 male connector mounted on board bracket. Port can be addressed as
COM1:-4, or any other I/O address up to 3FF Hex.
•Interrupt Request (IRQ) lines are jumper selected for IRQ 3,4,5 and 2/9.
•RS-232C Interface with all standard PC signals (TD, RD, RTS, CTS, DSR,
DCD, DTR, RI) or RS-530/422 interface .
•Serial port interface (RS-232, RS-530/422/485, 20 mA Current Loop) is
determined by jumper selection.
The SIO-530 is designed for asynchronous only operation and therefore
implements only those signals associated with async operation. The DTE mode for
RS-530 is assumed.
The SIO-530 utilizes the 16550 UART chip. This chip features programmable
baud rate, data format, interrupt control and has a 16 byte transmit and receive
FIFO. The SIO-530 can be addressed as COM1:, COM2:, or any other I/O address
up to 3FF Hex, providing total compatibility with most communications software
and languages. RS-232, RS-530/422/485, and 20 mA Current Loop compatible
drivers and receivers are provided on the serial port.

Technical Description
Sealevel Systems SIO-530 Page 11
Connector Pin Assignments
RS-232
Signal Name Pin # Mode
GND Ground 7
RD Receive Data 3Input
CTS Clear To Send 5Input
DSR Data Set Ready 6Input
DCD Data Carrier Detect 8Input
RI Ring Indicator 22 Input
DTR Data Terminal Ready 20 Output
TD Transmit Data 2Output
RTS Request To Send 4Output
RS-530/422/485
Signal Name Pin # Mode
GND Ground 7
RDB RX+ Receive Positive 16 Input
RDA RX-Receive Negative 3Input
CTSB CTS+ Clear To Send Positive 13 Input
CTSA CTS-Clear To Send Negative 5Input
DSRB DSR+ Data Set Ready Positive 22 Input
DSRA DSR-Data Set Ready Negative 6Input
DCDB DCD+ Data Carrier Detect Positive 10 Input
DCDA DCD Data Carrier Detect Negative 8Input
TDB TX+ Transmit Positive 14 Output
TDA TX-Transmit Negative 2Output
RTSB RTS+ Request To Send Positive 19 Output
RTSA RTS-Request To Send Negative 4Output
DTRB DTR+ Data Terminal. Ready Positive 23 Output
DTRA DTR-Data Terminal Ready Negative 20 Output
RS-530/422/485 Line Termination
Typically, each end of the RS-530/422/485 bus must have line terminating resistors.
A 100 ohm resistor is across each RS-530/422/485 input in addition to a 1K ohm
pull-up/pull-down combination that bias the receiver inputs.

Technical Description
Sealevel Systems SIO-530 Page 12
20 mA Current Loop
Signal Name Pin #
Current Source #1 21
TD+ Transmit Data Positive 25
RD+ Receive Data Positive 12
Current Source #2 9
TD-Transmit Data Negative 24
RD-Receive Data Negative 11
Ground 7
To perform a loop-back test, connect pins 21 to 25, 24 to 12, and 11 to 7.
Current Loop Connections
Passive Connection
Loop Input:Pin 12 (RD+) to Customer Current Source
Pin 11 (RD-) to Customer TD+ output
Loop Output:Pin 25 (TD+) to Customer Current Source
Pin 24 (TD-) to Customer RD+ Input
Active Connection
Loop Input: Pin 21 (Current Source 1) to Pin 12 (RD+)
Pin 11 (RD-) to Customer TD+
From Customer TD-to Pin 7 (Ground )
Loop Output: Pin 9 (Current Source 2) to Pin 25 (TD+)
Pin 24 (TD-) to Customer RD+
From Customer RD-to Pin 7 (Ground )

Specifications
Sealevel Systems SIO-530 Page 13
Specifications
Environmental Specifications
Specification Operating Storage
Temperature Range 0º to 50º C
(32º to 122º F ) -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
•IPC 610-A Class-III standards are adhered to with a 0.1 visual A.Q.L. and
100% Functional Testing.
•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 Consumption
Supply line +12 VDC -12 VDC +5 VDC
Rating 50 mA 50 mA 195 mA
Mean Time Between Failures (MTBF)
Greater than 150,000 hours. (Calculated)
Physical Dimensions
Board length 4.9 inches (12.446 cm)
Board Height including Goldfingers 4.2 inches (10.66 cm)
Board Height excluding Goldfingers 3.9 inches (9.91 cm)

Appendix A -Troubleshooting
Sealevel Systems SIO-530 Page 14
Appendix A -Troubleshooting
A Serial Utility Diskette is supplied with the Sealevel Systems adapter and will be
used in the troubleshooting procedures. By using this diskette 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 IRQ’s, many other
adapters (i.e. SCSI adapters & on-board serial ports) do not. The IRQ is
typically selected via an on-board header block. Refer to the section on Card
Setup for help in choosing an I/O address and IRQ.
4. Make sure the Sealevel Systems adapter is securely installed in a motherboard
slot.
5. Use the supplied diskette and User Manual to verify that the Sealevel Systems
adapter is configured correctly. The supplied diskette contains a diagnostic
program “SSD” that will verify if an adapter is configured properly. This
diagnostic program is written with the user in mind and is easy to use. Refer to
the “README” file on the supplied diskette for detailed instructions on using
“SSD”.

Appendix A -Troubleshooting
Sealevel Systems SIO-530 Page 15
6. The following are known I/O conflicts:
•The 278 and 378 settings may conflict with your printer I/O
adapter.
•3B0 cannot be used if a Monochrome adapter is installed.
•3F8-3FF is typically reserved for COM1:
•2F8-2FF is typically reserved for COM2:
•3E8-3EF is typically reserved for COM3:
•2E8-2EF is typically reserved for COM4:
7. Please refer to your included diskette for any post production manual updates
and application specific information.
8. Always use the Sealevel Systems diagnostic software when Troubleshooting a
problem. This will eliminate the software issue from the equation.

Appendix B -How To Get Assistance
Sealevel Systems SIO-530 Page 16
Appendix B -How To Get Assistance
Please refer to Appendix A -Troubleshooting prior to calling Technical Support.
1. Read this manual thoroughly before attempting to install the adapter
in your system.
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 maintains a forum on CompuServe providing
utilities and new product information. This forum is accessed by
typing “GO Sealevel” at the command prompt.
4. 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.