TM SeaPORT+2 Part # 2203 Sealevel Systems, Inc Phone: (864) 843-4343 155 Technology Place FAX: (864) 843-3067 P.O. Box 830 www.sealevel.com Liberty, SC 29657 USA Contents INTRODUCTION ........................................................................ 1 OVERVIEW ...........................................................................................1 WHAT’S INCLUDED..............................................................................1 INSTALLATION.......................................................................... 2 OPERATING SYSTEM INSTALLATION ....................................................2 SYSTEM INSTALLATION .......................................................................2 CONFIGURATION...................................................................... 4 ORIGINAL CONFIGURATION ..................................................................4 ELECTRICAL INTERFACE SELECTION.....................................................4 SWITCH EXAMPLES .............................................................................6 SWITCH EXAMPLES CONTINUED..........................................................7 TECHNICAL DESCRIPTION ....................................................... 8 FEATURES............................................................................................8 CONNECTOR PIN ASSIGNMENTS...........................................................8 RS-422/485 (DB 9 Male) ..........................................................8 RS-232 (DB-9 Male) .................................................................8 SPECIFICATIONS....................................................................... 9 ENVIRONMENTAL SPECIFICATIONS.......................................................9 MANUFACTURING................................................................................9 POWER CONSUMPTION........................................................................9 MEAN TIME BETWEEN FAILURES (MTBF) ..........................................9 PHYSICAL DIMENSIONS........................................................................9 APPENDIX A - TROUBLESHOOTING....................................... 10 APPENDIX B - HOW TO GET ASSISTANCE............................. 11 APPENDIX C - ELECTRICAL INTERFACE................................ 12 RS-232.............................................................................................12 RS-422.............................................................................................12 RS-485.............................................................................................13 APPENDIX D - ASYNCHRONOUS COMMUNICATIONS ............ 14 APPENDIX E - COMPLIANCE NOTICES................................... 15 FEDERAL COMMUNICATIONS COMMISSION STATEMENT...................15 CANADIAN RADIO INTERFERENCE REGULATIONS ..............................15 EMC DIRECTIVE STATEMENT ...........................................................16 WARRANTY............................................................................ 17 Figures: Figure 1: Switch SW2 .......................................................................................5 Figure 2: RS422/485 Interface Configuration.................................................6 Figure 3: Electrical Interface Configuration...................................................7 Figure 4 - Asynchronous Communications Bit Diagram...............................14 © 2001f Sealevel Systems, Incorporated. All rights reserved. Introduction Introduction Overview The Sealevel Systems SeaPORT+2 equips the PC with 2 USB to RS-232/422/485 Asynchronous serial ports providing a versatile interface for common serial needs. 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 IRQ’s. It does require a system that supports USB both in terms of hardware and operating system. What’s Included The SeaPORT+2 is shipped with the following items. If any of these items is missing or damaged, contact the supplier. · SeaPORT+2 USB to RS-232/422/485 Serial I/O Adapter · USB Cable Part Number CA179 for Connecting to Upstream Host/Hub · Sealevel Software Sealevel Systems SeaPORT+2 Page 1 Installation 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 SeaPORT+2 can be connected to any upstream type “A” port either at the PC host or an upstream hub. The SeaPORT+2 is hot pluggable, meaning there is no need to power down your computer prior to installation. Connect the SeaPORT+2 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 four 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. Sealevel Systems SeaPORT+2 Page 2 Installation You can access your new COM: ports by using the assigned COM: identifiers as shown above. In this case, it is COM 3 and 4. However, this assignment will vary from system to system. At this point, the hardware is recognized and ready to use. Sealevel Systems SeaPORT+2 Page 3 Configuration Configuration Original configuration This device ships from Sealevel Systems with the following configuration. 422 mode, 120 ohm termination, 1K ohm pull up on RX+ 1K ohm pull down on RX- In order to change this configuration the box must be opened. Do this by removing the four screws located on the bottom. When reassembling please note that the top and bottom are keyed to fit in only one direction. Electrical Interface Selection Each of the two ports on the SeaPORT+2 can be individually configured as an RS-232, RS-422, or RS-485 interface. This is selectable via the DIP switches and DIP shunts. Each of the switch positions is described on the following page. Sealevel Systems SeaPORT+2 Page 4 ON OFF 1 2 3 4 5 6 7 8 9 10 Configuration Switch Descriptions SW4 Port 1 L L T PU Port 2 PD L L T PU PD Figure 1: Switch SW4 L 485 option, OFF for 422. OFF: No effect ON : Connects TX+ to RX+ for two-wire operation L 485 option, OFF for 422. OFF: No effect ON : Connects TX- to RX- for two-wire operation PU 485 option, OFF for 422. OFF: No effect ON : Adds a 1 K ohm pull-up resistor to RX+ PD 485 option, OFF for 422. OFF: No effect ON : Adds a 1 K ohm pull-down resistor to RX- T 422 and 485 option. OFF: No effect ON : Adds a 120 ohm termination resistor between RX+ and RX- Sealevel Systems SeaPORT+2 Page 5 ON OFF 1 2 3 4 Configuration Switch Examples SW3 485 1 NE 1 485 2 NE 2 Figure 2: RS422/485 Interface Configuration 485 Mode Selection OFF : 422 Mode The transmitter lines TX+ and TX- are always driven ON : 485 Mode The transmitter lines TX+ and TX- are switched to high impedance when the device is not actively transmitting data NE 485 option, OFF for 422 OFF : The receiver is always enabled. In a two-wire setup the receiver will echo back all transmitted data. ON : The receiver is disabled when the transmitter is enabled. In a two-wire setup the receiver will not echo back transmitted data. Note: Switch positions 1 and 2 are for port 1 and switch positions 3 and 4 for port 2. Sealevel Systems SeaPORT+2 Page 6 ON OFF 1 2 3 4 5 6 7 8 9 10 Configuration Switch Examples Continued Port 2 Port 1 SW4 RS 422/485 RS 232 RS 422/485 RS 232 Port 1 L L T PU Port 2 PD L L T PU PD E8 E7 E6 E5 Figure 3: Electrical Interface Configuration Port 1 : RS-232 The corresponding shunt is in the 232 position. The switches will have no effect. Port 2 : RS-485 two wire communication with no echo. The corresponding shunt is in the 422/485 position. Switches 485 2, NE 2, and Port 2 L, L, T, PU, and PD are all in the ON position. Sealevel Systems SeaPORT+2 Page 7 Specifications Technical Description The SeaPORT+2 utilizes two 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 up to 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 IRQ’s) · LED status indicators for USB Enabled 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 Sealevel Systems SeaPORT+2 Page 8 Specifications Specifications Environmental Specifications Specification Operating Storage Temperature Range 0º to 50º C -20º to 70º C (32º to 122º F) (-4º to 158º F) Humidity Range 10 to 90% R.H. 10 to 90% R.H. Non-Condensing 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 This device is a high power USB device. It must be plugged into the USB root hub or a self powered hub capable of supplying 500 mA per port. Mean Time Between Failures (MTBF) Greater than 150,000 hours. (Calculated) Physical Dimensions Package Length 7.06 inches (17.93 cm) Package Width 5.32 inches (13.51 cm) Package Height 1.50 inches (3.81 cm) Sealevel Systems SeaPORT+2 Page 9 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. Using this software and following these simple steps, most common problems can be eliminated without the need to call Technical Support. 1. If your adapter isn’t working, first check to make sure that USB support is enabled in the System BIOS and it is functioning properly in the operating system. This can be done by using either the Windows 98/ME or Windows 2000 Device Manager. 2. Ensure that the Sealevel Systems software has been installed on the machine so that the necessary files are in place to complete the installation. 3. When the SeaPORT+2 is configured properly, the USB Enabled LED (E) will be lit. This should allow you to use Sealevel’s WinSSD utility and the supplied loopback plug to check communications. The supplied loopback plug connects TD to RD. If you decide to test the Modem Control Signals, a full pin loopback plug will be required. Details on loopback plugs are included on WinSSD. Contact Sealevel Systems if you need further assistance 4. When testing the SeaPORT+2 in loopback mode, you should see the port LED’s flashing as well as seeing echoed data on the screen. The loopback test first transmits a HEX pattern, 55AA, and then a ASCII string of data. If this test passes, then the SeaPORT+2 is ready for use in your application. 5. Please note that if the adapter is configured for 2 wire RS-485 with no echo a loopback test is not possible. The receiver in this case will be turned off and the test will fail. If you plan on using this device in two wire mode test the adapter in RS-422 mode first. Then configure the adapter for your application. Sealevel Systems SeaPORT+2 Page 10 Appendix B – How To Get Assistance 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 connected in a computer ready to run diagnostics. 3. Sealevel Systems maintains a home page on the Internet. Our home page address is www.sealevel.com. The latest software updates, and newest manuals are available via our FTP site that can be accessed from our home page. 4. Technical support is available Monday thru 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 SeaPORT+2 Page 11 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. This standard is defined as the 9-Position Non-Synchronous Interface between Data Terminal Equipment and Data Circuit-Terminating Equipment Employing Serial Binary Data Interchange. Both implementations are in wide spread use and will be referred to as RS-232 in this document. 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 SeaPORT+2 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. Sealevel Systems SeaPORT+2 Page 12 Appendix C - Electrical Interface 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. Sealevel Systems SeaPORT+2 Page 13 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. Character boundaries for asynchronous communications are defined by a starting bit followed by a pre-defined number of data bits (5, 6, 7, or 8). 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 Odd, Even line or Remain Idle or 5 to 8 Data Bits Unused next start bit 1 P STOP BIT 0 1 1.5 2 Figure 4 - 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). Sealevel Systems SeaPORT+2 Page 14 Appendix E - Compliance Notices Appendix E - 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. 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. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: · Reorient or relocate the receiving antenna · Increase the separation between the equipment and receiver · Connect the equipment into an outlet on a circuit different from that to which the receiver is connected · Consult the dealer or an experienced radio/TV technician for help Caution Sealevel Systems, Inc. is not responsible for any radio or television interference caused by unauthorized modifications of this equipment or the substitution of attachment of connecting cables and equipment other than those specified by Sealevel Systems. Such unauthorized modifications, substitutions, or attachments may void the user’s authority to operate the equipment. The correction of interference caused by such unauthorized modifications, substitutions, or attachments will be the responsibility of the user. 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 directives. Canadian Radio Interference Regulations This Class B digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations. Cet Appareil numérique de la classe B respecte toutes les exigences de Règlement sur le matériel du Canada Sealevel Systems SeaPORT+2 Page 15 Appendix E - 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. To obey these directives, the following European standards must be met: EN55022 Class B - ‘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’ 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 EMC directives. Sealevel Systems SeaPORT+2 Page 16 Warranty Warranty Sealevel Systems, Inc. provides a lifetime warranty for this product. 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. 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. 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, Incorporated 155 Technology Place 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. SeaPORT+2 is a trademark of Sealevel Systems, Incorporated. Sealevel Systems SeaPORT+2 Page 17