SeaLINK.SC User Manual Item Number 2123 www.sealevel.com PO Box 830 – Liberty, SC 29657 864.843.
Table of Contents INTRODUCTION......................................................................................................................... 1 BEFORE YOU GET STARTED................................................................................................. 2 WHAT’S INCLUDED ...................................................................................................................... 2 OPTIONAL ITEMS.....................................................................................
Introduction Sealevel’s SeaLINK® 2123 USB to serial interface adapter offers an easy way to connect a DB9 serial device to a USB port. All configuration and electrical interface selections are handled through the driver, eliminating the need to open the enclosure to set jumpers or switches.
Before You Get Started What’s Included The SeaLINK.SC is shipped with the following items. If any of these items is missing or damaged please contact Sealevel for replacement. 2123 – USB to RS-232/422/485 Two Port Serial Interface Adapter CA356 – USB Type A to SeaLATCH USB Type B Device Cable, 6’ in Length Sealevel Software CD – SeaCOM software and user manual Optional Items Depending upon your application, you are likely to find one or more of the following items useful.
Terminal Blocks Terminal Block – DB9F to 9 Screw Terminals (Item# TB05) The TB05 terminal block breaks out a DB9 connector to nine screw terminals to simplify field wiring of serial connections including RS-422 and RS-485 networks. The TB05 is designed to connect directly to Sealevel DB9 serial cards or any cable with a DB9M connector.
Installation & Configuration Software Installation Windows 98/ME/ 2000/XP/Vista™ Operating Systems 1. Start Windows. 2. Insert the Sealevel Software CD in to your CD/DVD drive. 3. If ‘Auto-Start’ is enabled the installation window will automatically appear. Otherwise, navigate to the root directory of your CD drive and double-click the ‘autorun.exe’ application to launch the installation window. 4. Click the ‘Install’ button. 5. Type in your part number (2123) or select your adapter from the listing. 6.
Hardware Installation Do not connect the device to a USB port until the software has been successfully installed. To install the 2123, plug the device into an available USB port using the supplied USB cable. The following instructions were tested with Windows XP and may vary based on your version of Windows. Once the device has been connected, the Found New Hardware wizard will appear first for the root hub and then for each port that you are installing.
Verifying Installation To confirm that the drivers have been successfully installed, you can look in Device Manager under ‘Ports (COM &LPT)’ and the port you installed will be included on the list with the associated COM number. To access Device Manager, follow the steps below: 1. Right-click on the ‘My Computer’ icon on your desktop or in the Start menu. 2. Click on ‘Properties’ in the fly out menu to launch the ‘System Properties’ window. 3.
Hardware Configuration Electrical Interface Mode Selection The 2123 offers RS-232, RS-422, and RS-485 (full and half duplex) modes. The electrical interface is a software selectable feature that can be accessed and changed using the Sealevel SeaCOM driver via Device Manager. To select the electrical interface, follow the steps below: 1. Open Device Manager and locate ‘Ports (COM&LPT)’ following the steps above. You should see the 2123’s port listed. 2.
Interface Biasing 1K-ohm pull up/pull down combination resistors bias the receiver inputs and are handled automatically for each mode. The pull-up (PU) and pull-down (PD) resistor settings are shown in the table below. Mode PU Setting PD Setting RS-232 Always Off Always Off RS-422 Always Off Always Off RS-485 Always On Always On Line Termination A 120-ohm resistor is across the RS-422/485 input.
Echo The RS-485 ‘Echo’ is the result of connecting the receiver inputs to the transmitter outputs. Each 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), but it can also confuse the system if the software cannot support echoing. Echo configuration is software selectable for half-duplex RS-485.
Hardware Description SeaLATCH™ USB Port The 2123 integrates a patent-pending SeaLATCH USB port, which is fully compatible with standard USB cables. When used with the included USB cable with a SeaLATCH type B USB connector, the metal thumbscrew provides a secure metal-to-metal connection to the device and prevents accidental cable disconnection.
SeaLATCH™ USB The 2123 integrates a patent-pending SeaLATCH USB port, which is fully compatible with standard USB cables. When used with SeaLATCH locking USB cables, the metal thumbscrew provides a secure metal-to-metal connection and prevents accidental cable disconnection. Sealevel incorporates SeaLATCH locking USB ports on many USB I/O devices.
SeaLATCH Locking USB Cables SeaLATCH USB Connectors SeaLATCH locking USB cables integrate a small thumbscrew into each USB connector. SeaLATCH USB cables are fully interchangeable with standard USB cables. The thumbscrew provides a secure metalto-metal connection preventing accidental disconnection. SeaLATCH USB cables are available in three configurations. Item# CA356 The CA356 is a 72” USB cable with a SeaLATCH type B connector and a standard USB type A connector.
Electrical Specifications The 2123 connects to a single USB port and provides a single RS-232/422/485 software configurable serial port. The 2123 utilizes high speed USB/UARTs with 128-byte Tx FIFOs and 384-byte Rx FIFOs. The chips feature programmable baud rates and data rates to 921.6K bps.
Technical Specifications Dimensions Length Width Height 4.3” 3.4” 1.3” 10.9cm 8.6cm 3.3cm Environmental Specifications Specification Temperature Range Humidity Range Operating 0°C – 70°C (32°F – 158°F) 10 to 90% R.H. Non-Condensing Storage -50°C – 105°C (-58°F – 221°F) 10 to 90% R.H. Non-Condensing Power Requirements This device is a high power USB device. It must be plugged directly into a USB port on your computer or a self-powered hub capable of supplying 200 mA per port.
Appendix A - Troubleshooting The adapter should provide years of trouble-free service. However, in the event that it appears to be functioning incorrectly, the following tips can eliminate most common problems without the need to call Technical Support. 1. Ensure that the Sealevel Systems SeaCOM software has been installed on the machine so that the necessary files are in place to complete the installation. To confirm installation, click on the Windows ‘Start’ button and then select ‘All Programs’.
On the ‘Port Information’ tab, select the COM port you want to test and click on the ‘Open’ button. (pictured below) Click the ‘Settings’ button to open the COM Properties menu. Change your parameters to 9600 bits per second, 8 data bits, no parity, 1 stop bit, and no flow control, as pictured below. Click ‘Apply’ and ‘Ok’. © Sealevel Systems, Inc. - 16 - SeaLINK.
Select the ‘BERT’ tab and with the loopback connected to the port you wish to test, click on the ‘Start’ button. If testing RS-485, be sure that ECHO is enabled. (Pictured below) If the COM port is working properly, the green light will glow and the Transmit Frames and Receive Frames will increase. The Tx and Rx Data Rates will show the calculated data rate. (Pictured below) You can continue testing this port with different configurations or proceed with testing other ports, if necessary.
Appendix B - How To Get Assistance Begin by reading the Troubleshooting Guide in Appendix A. This will help solve most common problems. When calling for technical assistance, please have the device installed and ready to run diagnostics. If possible, have your user manual and current adapter settings ready. The Sealevel website is an excellent resource. Our homepage is located online at http://www.sealevel.com.
Appendix C – Electrical Interfaces 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 RS232 or EIA/TIA-232. The IBM PC computer defined the RS-232 port on a 9 pin D sub connector and subsequently the EIA/TIA approved this implementation as the EIA/TIA574 standard.
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 compatible and PS/2 computers.
Appendix E – CAD Drawings – 2123 © Sealevel Systems, Inc. - 21 - SeaLINK.
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.
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.
