DUOCOM™ User Manual Part #3088 Sealevel Systems, Inc. PO Box 830 Liberty, SC 29657 USA Telephone: (864) 843-4343 Fax: (864) 843-3067 www.sealevel.
Contents INTRODUCTION ........................................................................ 1 OVERVIEW ......................................................................................1 WHAT’S INCLUDED.........................................................................1 FACTORY DEFAULT SETTINGS ........................................................1 CARD SETUP ............................................................................ 2 ADDRESS SELECTION ....................................
WARRANTY ............................................................................ 17 Figure 1 - Address Selection Table ...........................................................2 Figure 2 - Header E1 and E2, IRQ Selection ...........................................3 Figure 3 - Header E3, Normal IRQ Mode................................................4 Figure 4 - Header E3, Shared IRQ Mode ................................................4 Figure 5 - Header E3, Sharing IRQ’s with another adapter........
Introduction Introduction Overview The Sealevel Systems DUOCOM: provides the PC with 2 Asynchronous serial ports providing a versatile interface for common RS-232 needs (i.e. modem, mouse and plotters). What’s Included The DUOCOM: is shipped with the following items. If any of these items are missing or damaged, contact the supplier.
Card Setup Card Setup The DUOCOM: contains several jumper straps which must be set for proper operation. Address Selection Each serial port on the DUOCOM: occupies eight consecutive I/O locations, and looks to the PC as a standard serial port. A DIP switch (SW1) is used to set the port address options for the DUOCOM:. Be careful when selecting the port addresses as some selections may conflict with existing ports. The following table shows the addressing options available with the standard PAL.
Card Setup IRQ Selection Headers E1 and E2 select the interrupt request for each serial port (E1 - Port 1, E2 - Port 2). If COM1: is selected, the corresponding jumper must be on the IRQ4 setting. If COM2: is selected, the corresponding jumper must be on IRQ3. 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.
Card Setup Interrupt Modes Header E3 selects the interrupt mode for each port. Each port must be set in the correct mode to insure proper installation. ‘N’ indicates the (N)ormal, single interrupt per port mode. ‘S’ Indicates the (S)hared interrupt mode, which allows more than one port to access a single IRQ. Any two or more ports can share a common IRQ by placing the jumpers on the same IRQ setting, and setting the appropriate selections at E1. Consult your particular software for IRQ selection.
Card Setup Set the jumper to ‘S’ if you are using more than one DUOCOM: in a bus or you wish to completely remove the pull-down resistor for hardware compatibility. Setting the adapter in this configuration when it is not accompanied by a pull-down resistor will prevent the ports from triggering an interrupt.
Technical Description Installation Operating System Installation For Windows Users Start by choosing Install Software at the beginning of the CD. Choose Asynchronous COM: Port Software, SeaCOM. Other Operating Systems Refer to the appropriate section of the Serial Utilities Software. System Installation The DUOCOM: can be installed in any of the PC expansion slots, but to access the ‘AT’ or (E)ISA IRQs (10 - 15) it must be installed in one of the 16 bit slots.
Technical Description Technical Description The DUOCOM: utilizes the 16550 UART. This chip features programmable baud rate, data format, interrupt control and a 16 byte input and output FIFO. Also available as an option is the 16C650 UART that provides a deeper FIFO (32 bytes) and enhanced clocking features. Features • Addressable as COM1: - COM4: and other selectable address combinations. • ‘Shareable’ IRQs allow more than one port to share a single IRQ. • IRQs 2-5, 7, 10, 11, 12, 15 supported.
Specifications Specifications Environmental Specifications Specification Temperature Range Humidity Range Operating 0º to 50º C (32º to 122º F) 10 to 90% R.H. Non-Condensing Storage -20º to 70º C (-4º to 158º F) 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.
Appendix A - Troubleshooting Appendix A - Troubleshooting Serial Utility test 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.
Appendix A - Troubleshooting 8. 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.
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.
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. 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/TIA-574 standard.
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.
Appendix E - Silk-Screen Appendix E - Silk-Screen 3.9" 5.0" 4.
Appendix F - Compliance Notices Appendix F - Compliance Notices Federal Communications Commission Statement This equipment has been tested and found to comply with the limits for Class B 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 residential installation.
Appendix F - Compliance Notices 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.
Warranty Warranty Sealevel Systems, Inc. provides a limited lifetime warranty. Should this product fail to be in good working order at any time during this period, Sealevel Systems will, at it’s option, replace or repair it at no additional charge except as set forth in the following terms. This warranty does not apply to products damaged by misuse, modifications, accident or disaster.
