SeaLevel SeaLINK+8/USB Manuale utente
SeaLINK+8/USB
TM
Part # 280X
Sealevel Systems, Inc
P.O. Box 830
Liberty, SC 29657 USA
Phone: (864) 843-4343
FAX: (864) 843-3067
www.sealevel.com
Contents
INTRODUCTION........................................................................ 1
OVERVIEW......................................................................................1
WHAT’S INCLUDED ........................................................................1
INSTALLATION......................................................................... 2
OPERATING SYSTEM INSTALLATION...............................................2
SYSTEM INSTALLATION..................................................................2
CONFIGURATION ..................................................................... 4
FACTORY CONFIGURATION.............................................................4
ELECTRICAL INTERFACE SELECTION ..............................................4
MODE SELECT CONFIGURATION.....................................................5
INTERFACE BIASING CONFIGURATION............................................6
TECHNICAL NOTE...........................................................................6
TECHNICAL DESCRIPTION....................................................... 7
FEATURES.......................................................................................7
CONNECTOR PIN ASSIGNMENTS .....................................................7
RS-422/485 (DB-9 Male)........................................................7
RS-232 (DB-9 Male)...............................................................7
SPECIFICATIONS ...................................................................... 8
ENVIRONMENTAL SPECIFICATIONS.................................................8
MANUFACTURING...........................................................................8
POWER CONSUMPTION ...................................................................8
MEAN TIME BETWEEN FAILURES (MTBF).....................................8
PHYSICAL DIMENSIONS ..................................................................8
APPENDIX A - TROUBLESHOOTING ........................................ 9
APPENDIX B - HOW TO GET ASSISTANCE............................ 10
APPENDIX C - ELECTRICAL INTERFACE .............................. 11
RS-232.........................................................................................11
RS-422.........................................................................................11
RS-485.........................................................................................12
APPENDIX D - ASYNCHRONOUS COMMUNICATIONS............ 13
APPENDIX E - COMPLIANCE NOTICES.................................. 14
FEDERAL COMMUNICATIONS COMMISSION STATEMENT ..............14
EMC DIRECTIVE STATEMENT ......................................................14
WARRANTY............................................................................ 15
Figures:
Figure 1- Dip Switches SW1 - SW4 RS-422 Default Mode....................5
Figure 2- Electrical Interface Mode Selection.........................................5
Figure 3 - Electrical Interface Termination and Biasing Selection .......6
Figure 4 - Asynchronous Communications Bit Diagram .....................13
© Sealevel Systems Inc.
SL9103 Revision 7/2006
Sealevel Systems, Incorporated. All rights reserved.
Introduction
Sealevel Systems SeaLINK+8 Page 1
Introduction
Overview
The Sealevel Systems SeaLINK+8 family of products equips the PC with 8
USB to Asynchronous serial ports. Three different model numbers are available
that offer a variety of port options. Model 2801 equips the PC with 8 additional
RS-232 ports that support a full RS-232 interface and data rates up to 460.8K
baud. Model 2802 equips the PC with 8 RS-422/485 ports that support data
rates up to 921.6K baud and provide selectable line termination and biasing. 2-
wire RS-485 line turnaround is supported via an onboard hardware circuit.
Model 2803 equips the PC with 8 user configurable RS-232/422/485 ports.
Each port is individually configurable and the interface is selected by
configuring two dipswitch positions. The advantage of this product over more
traditional approaches is that it does not require opening the computer case, nor
does it require resources such as I/O ports or IRQs. It does require a system that
supports USB both in terms of hardware and operating system.
What’s Included
The SeaLINK+8 is shipped with the following items. If any of these items is
missing or damaged, contact the supplier.
• SeaLINK+8 USB to Asynchronous Serial Converter
• USB Cable Part Number CA179 for Connecting to Upstream
Host/Hub
• Sealevel Software
Installation
Sealevel Systems SeaLINK+8 Page 2
Installation
Operating System Installation
Choose Install Software at the beginning of the CD and install SeaCOM.
System Installation
The screen captures below are taken from a Windows 98 installation. Your
particular operating system may differ slightly from what is shown based on
your version of Windows.
The SeaLINK+8 can be connected to any upstream type “A” port, either at the
PC host or an upstream hub. The SeaLINK+8 is hot pluggable, meaning there is
no need to power down your computer prior to installation.
Connect the SeaLINK+8 to an upstream host or hub.
The New Hardware Found wizard will now proceed to locate the appropriate
drivers. These drivers were installed during the SeaCOM software setup
procedure. Once the drivers are found a new window will pop up indicating the
installation of each of the eight new ports.
If you view the system’s Device Manager, you should have new “COM” ports
in the Ports (COM & LPT) Device Class. This is shown on the following page.
Installation
Sealevel Systems SeaLINK+8 Page 3
You can access your new COM: ports by using the assigned COM: identifiers as
shown above. In this case, it is COM’s 12 thru 19. However, this assignment
will vary from system to system. At this point, the hardware is recognized and
ready to use.
Configuration
Sealevel Systems SeaLINK+8 Page 4
Configuration
Factory configuration
Each device ships from Sealevel Systems with the following configuration.
Model 2801 – SeaLINK+8/232 USB to RS-232 Converter
Contains no user configurable components.
Model 2802 – SeaLINK+8/485 USB to RS-422/485 Converter
RS-422 4-wire full duplex mode selected.
Transmitter always enabled.
Receiver always enabled and terminated and biased as follows:
120ohm terminator between RX+ and RX-
1Kohm pull-up on RX+
1Kohm pull-down on RX-
Model 2803 – SeaLINK+8 USB to RS-232/422/485 Converter
RS-422 4-wire full duplex mode selected.
Transmitter always enabled.
Receiver always enabled and terminated and biased as follows:
120ohm terminator between RX+ and RX-
1Kohm pull-up on RX+
1Kohm pull-down on RX-
In order to change the configuration the box must be opened. Do this by
removing the four screws that attach the two halves of the box.
Electrical Interface Selection
Each port of the SeaLINK+8 models 2802 and 2803 can be individually
configured for the specific electrical interface. Model 2802 supports
RS-422/485 while Model 2803 supports RS-232/422/485. This is selectable via
the dipswitch associated with each port. Each of the switch positions is
described on the following page.
Configuration
Sealevel Systems SeaLINK+8 Page 5
Below is a figure of dipswitches SW1, SW2, SW3, and SW4. Each switch has a
total of twelve positions and serves to configure two ports. Six positions are
used for each port. The default mode of RS-422 4-wire full duplex is shown.
ON
12
OFF
3456
789101112 PORT 1PORT 2 SW1
M0M1TPU
PU
PD MODE
M0M1TPUPUPD MODE
ON
12
OFF
3456
789101112 PORT 3PORT 4 SW2
M0M1TPU
PU
PD MODE
M0M1TPUPUPD MODE
ON
12
OFF
3456
789101112 PORT 5PORT 6 SW3
M0M1TPU
PU
PD MODE
M0M1TPUPUPD MODE
ON
12
OFF
3456
789101112 PORT 7PORT 8 SW4
M0M1TPU
PU
PD MODE
M0M1TPUPUPD MODE
Figure 1- Dip Switches SW1 - SW4 RS-422 Default Mode
Mode Select Configuration
The first two positions for each port are used to select the electrical interface
mode. In RS-422 mode the transmitter and receiver are always enabled.“485
WE” refers to RS-485 mode with receiver echo. In this mode the receiver is
always enabled. If the card is in 2-wire mode, all transmitted data will be
“echoed” back. “485 NE” refers to RS-485 mode with no receiver echo. In this
mode the receiver is enabled only when no data is being transmitted. In either
RS-485 mode the transmitter is only enabled during data transmission. Refer to
the chart below for specific switch settings. Note that this chart appears in the
silk screen on the board as well.
SWITCH
232
MODE SELECT
422
485 WE
485 NE
OFF OFF
M1 M0
OFF OFF
ON
ON
ON ON
Figure 2- Electrical Interface Mode Selection
Configuration
Sealevel Systems SeaLINK+8 Page 6
Interface Biasing Configuration
The last four positions for each port are used to select the line termination and
bias settings. Refer to the chart below for specific switch settings of the three
supported electrical interface modes. Note that this chart appears in the silk
screen on the board as well.
PD = 1Kohm pull-down resistor connected to RX-
RS-232 mode = always OFF
RS-422 mode = always ON
RS-485 mode = ON if not provided by another device on the bus
PU = 5.1Kohm pull-up resistor connected to CTS+
RS-232 mode = always OFF
RS-422 mode = always ON
RS-485 mode = always ON
PU = 1Kohm pull-down resistor connected to RX+
RS-232 mode = always OFF
RS-422 mode = always ON
RS-485 mode = ON if not provided by another device on the bus
T = 120ohm terminating resistor connected between RX+ and RX-
RS-232 mode = always OFF
RS-422 mode = always ON
RS-485 mode = ON if physically located at one end of bus
SWITCH
232
INTERFACE BIASING
422
485
OFF OFF
PD PU
ON ON
ON
ON
OFF OFF
PU T
ON ON*
ON
ON
* = IF END OF 485 BUS
Figure 3 - Electrical Interface Termination and Biasing Selection
Technical Note
Contrary to some of our other products, there are no provisions on board for
looping TX+ to RX+ and TX- to RX- for 2-wire RS-485 mode. These
connections must be made externally inside the mating DB-9 connector. Refer
to the RS-422 pinout diagram for the appropriate pin numbers.
Specifications
Sealevel Systems SeaLINK+8 Page 7
Technical Description
The SeaLINK+8 utilizes eight USB UARTs. These chips feature programmable
baud rate, data format, 128 byte Dual Port TX Buffer, and 384 byte Dual Port
RX Buffer. The RS-232/422/485 transceiver supports data rates up to 921.6K
baud for RS-422/485 and 460.8K baud for RS-232.
Features
• Hot pluggable device that does not require opening the case
• No system resources are required (i.e. I/O ports or IRQs)
• LED status indicators for power and port activity
Connector Pin Assignments
RS-422/485 (DB-9 Male)
Signal Name Pin # Mode
GND Ground 5
TX + Transmit Data Positive 4 Output
TX- Transmit Data Negative 3 Output
RTS+ Request To Send Positive 6 Output
RTS- Request To Send Negative 7 Output
RX+ Receive Data Positive 1 Input
RX- Receive Data Negative 2 Input
CTS+ Clear To Send Positive 9 Input
CTS- Clear To Send Negative 8 Input
RS-232 (DB-9 Male)
Signal Name Pin # Mode
GND Ground 5
TX Transmit Data 3 Output
RTS Request To Send 7 Output
DTR Data Terminal Ready 4 Output
RX Receive Data 2 Input
CTS Clear To Send 8 Input
DSR Data Set Ready 6 Input
DCD Data Carrier Detect 1 Input
RI Ring Indicator 9 Input
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