Ö· Ò ·Ö Ö· ·Ö Ò Ò Ò Ç½ º ºº Ó· ºº º º º ½ ÓÄ Ó½ Ó½ Ó/ Ð Ð Ð PLUS 8 User's Guide Manual Part Number: 650054-04 CONTENTS Cautions, Notices, & Warnings i Chapter 1 Introduction General Description 1 Physical Description 2 System Requirements 3 Chapter 2 Installation Tools Required 4 Handling Precautions 4 Hardware Configuration 5 Multifunction Switch 5 Settings for QNX Operating System 8 Settings for PC-MOS Operating System 8 Settings for SCO XENIX or SCO UNIX 9 Programmable Jumper 9 System Unit Installation 10 External Panel Connection 11 Peripheral Device Connection 12 Chapter 3 Hardware Introduction 16 Address Decoder PLD 16 Interrupt Select PROM 16 Universal Asynchronous Receiver Transmitter 17 Microprocessor 17 Line Drivers and Receivers 18 Modem Control Interface 18 Chapter 4 Software Optional Programs 19 Limited Warranty 20 Chapter 1 Introduction General Description The Star Gate Technologies PLUS 8TM is a multiport communications expansion board. It permits up to eight serial devices to be interfaced with an ISA (Industry Standard Architecture) or EISA (Extended Industry Standard Architecture) bus personal computer. An additional eight serial devices can be accommodated by adding a second PLUS 8 board to the system unit. The PLUS 8 board provides full modem flow control communications for each serial device. This feature is beneficial when used in conjunction with multiuser operating systems and transmission rates exceeding 2400 baud. In this environment the system normally cannot keep pace with incoming data from eight separate sources. Using flow control, the system will receive data as it can be handled, thus insuring that characters are not lost and that files are not corrupted. Communications and flow control are performed with an on-board microprocessor and a separate Universal Asynchronous Receiver/Transmitter (UART) for each device port. Address map selection and interrupt selection are configurable for maximum application flexibility. In addition, the mode select feature permits the modem flow control logic to be disabled for all ports except the first. Serial devices are interfaced to the PLUS 8 board via an External Panel. This eliminates crosstalk between communication channels and alleviates cable congestion behind the system unit. The External Panel has eight, 25-position D connectors for serial devices and is connected to the PLUS 8 board with a fully shielded, 25-conductor cable. Physical Description The PLUS 8 board is available in several different versions depending upon the number of UARTs on-board and the version of PLD (Programmable Logic Device) and PROM installed. Specifications which apply to all versions are listed in Table 1. The PLUS 8 board requires one full-length expansion slot in the system unit. The PLUS 8 board is supplied with the card guide, the External Panel, the board-to-panel interconnect cable, and the PLUS 8 User's Guide. For future reference, you may want to place the PLUS 8 User's Guide in the Guide to Operations binder supplied with the computer. TABLE 1 SPECIFICATIONS Number of Channels 8 maximum Interface Format Serial with control lines RTS, CTS, DTR, DSR, DCD, Rl per EIA-232 DTE configuration* Communications 50 to 38,400 baud selectable under program control External Panel Connectors 8, 25-position female D receptacles I/0 Channel Address 2 sets available via DIP switch lnterrupts 5 levels available via DIP switch Power Requirements +5 V at 2.18 A maximum +12 V at 50 mA maximum -12 V at 46 mA maximum Temperature Operating 0oC to 55oC Storage - 10oC to 70oC Relative Humidity Operating 10% to 90% Noncondensing * Note, however, that the connector employed for these 8 ports is a female of the type normally used for DCE interface. System Requirements In order to achieve proper operation of the PLUS 8 board, the following minimum system requirements must be observed: ù The host system unit must be an ISA or EISA bus personal computer. ù One full-length expansion slot must be available for each PLUS 8 board that will be used. ù When the operating system is either PC-DOS or MS-DOS, the version must be 3.0 or higher. ù At least one IRQ line per PLUS 8 board must be available if interrupt driven. Chapter 2 Installation Tools Required The only tools required to install the PLUS 8 board into a PC are 1/4-inch and 3/16-inch nut drivers. Handling Precautions The PLUS 8 board contains several components that may be permanently damaged if the board is handled improperly. To avoid accidental damage, follow these recommendations. ù Before handling the board, touch a grounded object to discharge any static electricity that has accumulated on your body. ù Never insert or remove the board while power is applied to the system unit. Once the system unit power switch is shut off, wait at least ten seconds for the power supply to discharge before inserting or removing the board. ù Never connect or disconnect the External Panel interconnect cable while power is applied to the system unit and the peripheral devices. Hardware Configuration Prior to installing the PLUS 8 board into the system unit, it is necessary to verify that the hardware is configured properly for use with the system unit and the application program. The hardware configuration is determined by an 8-position DIP switch and one programmable jumper. These topics are discussed in the following paragraphs. Refer to Figure 1 which illustrates the location of these items on the board. ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿ ³ U1 ³ ³ ÚÄÄÄÄÄÄÄÄÄ¿ Ú¿ ÚÄU10ÄÄÄ¿ ³ ³ ÀÄÄÄÄÄÄÄÄÄÙ JP1 ÀÙ ÀÄÄÄÄÄÄÄÙ ³ ³ ÚÄÄU2ÄÄÄÄÄ¿ ÚÄU11ÄÄÄ¿ ³ ³ ÀÄÄÄÄÄÄÄÄÄÙ ÚÄÄU7ÄÄ¿ ÀÄÄÄÄÄÄÄÙ ÚPROMÄÄÄ¿ ³ ³ ÚÄU3ÄÄÄÄÄÄ¿ ÀÄÄÄÄÄÄÙ ÚÄU12ÄÄÄ¿ ÀÄU19ÄÄÄÙ ³ ³ ÀÄÄÄÄÄÄÄÄÄÙ ÚÄÄU8ÄÄ¿ ÀÄÄÄÄÄÄÄÙ ³ ³ ÀÄÄÄÄÄÄÙ ÚÄSW1ÄÄÄ¿ ÚÄU23Ä¿ ³ ³ ³ ³ ÀÄPLDÄÙ ³ ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿ ÀÄÄÄÄÄÄÄÙ ÚÄÄÄÄÄÄÙ ³ ³ ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿ 0N ³ ÚÄ¿ ÚÄ¿ ÚÄ¿ ÚÄ¿ ÚÄ¿ ÚÄ¿ ÚÄ¿ ÚÄ¿ ³ ³ ÃÄ´ ÃÄ´ ÃÄ´ ÃÄ´ ÃÄ´ ÃÄ´ ÃÄ´ ÃÄ´ ³ OFF ³ À1Ù À2Ù À3Ù À4Ù À5Ù À6Ù À7Ù À8Ù ³ ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ FIGURE 1 - Location of User-Programmable Features Multifunction Switch The 8-position DIP switch is labeled SWI. The switches in this bank are used to select interrupt operation and the I/0 channel address map. A description of each selection is listed in Table 2. Switches 1 through 6 are used to enable or disable the interrupt levels on an individual basis. Interrupt level 2 has the highest priority and interrupt level 7 has the lowest. Switch 7 is used to control the overall interrupt operation. For most multiuser applications, switch 7 should be On. When this choice is selected, all ports will interrupt on the level chosen with switches 1 through 6. Note that one, and only one, interrupt level should be enabled. The only time switch 7 should be Off is when DOS compatibility must be maintained, for example if the application program is advanced basic. When this choice is selected, the first port interrupts on level 4 (COM1); the second port interrupts on level 3 (COM2); and, the remaining ports interrupt on level 2, 5, 6, or 7. In this mode, the individual interrupt switches must be enabled for each interrupt level that will be used. Switch 8 is used to select the I/0 channel memory address map. Either choice may be selected. However, if more than one PLUS 8 board is installed in the system unit, each board must be set to a unique I/0 channel address map as shown in Table 3. Before setting switches, check the operating system manual and application program manual for interrupt and I/O address recommendations. Then choose switch selections to match. If you need more information on interrupt operation or I/O channel addressing, refer to the system's technical reference manual. Examples for configuring the popular multiuser operating systems appear on the following pages. The switch selections shown assume that a standard DOS PLD (800000-xx or 800001-xx) and PROM devices are used, except when noted. TABLE 2_SW1 SWITCH SETTINGS SW1 Position Description 1 IRQ 2_ON enables, OFF disables. 2 IRQ 3_ON enables, OFF disables. 3 IRQ 4_ON enables, OFF disables. 4 IRQ 5_ON enables, OFF disables. 5 IRQ 6_ON enables, OFF disables. 6 IRQ 7_ON enables, OFF disables. 7 Interrupt control_ON for normal mode, OFF for DOS/ BASICA-compatible (or other special) mode. 8 I/O Address Map Selection_ON selects primary map,OFF selects secondary map. PLUS 8 I/O address choices are set by a PLD device located to the right of the 8-position DIP switch. Table 3 lists the hex I/O addresses for various PLDs. For all PLDs, use the primary address list by switching position 8 of SW1 to ON. To use the secondary list, switch position 8 of SW1 to OFF. TABLE 3_ I/O ADDRESS MAP Port DOS (800000-xx or 800001-xx) SCO UNIX/XENIX (800055-xx) Primary Secondary Primary Secondary 1 3F8 180 190 290 2 2F8 188 198 298 3 280 190 1A0 2A0 4 288 198 1A8 2A8 5 290 1A0 1B0 2B0 6 298 1A8 1B8 2B8 7 2A0 1B0 1C0 2C0 8 2A8 1B8 1C8 2C8 Int.Status1 7F8 580 1D0 2D0 Port PC-MOS 800010-xx PC-MOS 800095-xx PC-MOS 800096-xx Primary Secondary Primary Secondary Primary Secondary 1 3F8 6A0 210 610 A10 E10 2 2F8 6A8 218 618 A18 E18 3 3E8 7E8 220 620 A20 E20 4 2E8 6E8 228 628 A28 E28 5 280 680 230 630 A30 E30 6 288 688 238 638 A38 E38 7 290 690 240 640 A40 E40 8 298 698 248 648 A48 E48 Int.Status1 FF8 EF8 _ _ _ _ 1Bit assignments for each interrupt status register and its port are shown below: (Logic 1 is interrupt pending_active. Logic 0 is no interrupt request_clear.) One Byte I/O Read at Interrupt Status Address Bit: 7 6 5 4 3 2 1 0 Port: P8 P7 P6 P5 P4 P3 P2 P1 Settings for QNX Operating System Set up the first PLUS 8 board to interrupt on IRQ 4 and use the primary I/O address map. Set up the second PLUS 8 board, if used, to interrupt on IRQ 3 and use the secondary I/O address map. Note that QNX requires a special PLD device (Part Number 800040-xx). Contact your Star Gate sales representative if you need this PLD. First PLUS 8 Board (QNX) Position 1_OFF Position 5_OFF Position 2_OFF Position 6_OFF Position 3_ON Position 7_ON Position 4_OFF Position 8_ON Second PLUS 8 Board Settings (QNX) Position 1_OFF Position 5_OFF Position 2_ON Position 6_OFF Position 3_OFF Position 7_ON Position 4_OFF Position 8_OFF Note for PC-MOS, SCO XENIX and SCO UNIX Users: If both COM1 and COM2 are already set up in your system, you cannot use the PLUS 8. If you have one built-in serial port, you can only add one PLUS 8 board. Instead, please use the ACL family of intelligent boards from Star Gate. Settings for PC-MOS Operating System Set up the first PLUS 8 board to interrupt on IRQ 4 and use the primary I/O address map. Set up a second PLUS 8 board, if used, to interrupt on IRQ3 and use the secondary I/O address map. First PLUS 8 Board Settings (PC-MOS) Position 1_OFF Position 5_OFF Position 2_OFF Position 6_OFF Position 3_ON Position 7_ON Position 4_OFF Position 8_ON Second PLUS 8 Board Settings (PC-MOS) Position 1_OFF Position 5_OFF Position 2_ON Position 6_OFF Position 3_OFF Position 7_ON Position 4_OFF Position 8_OFF Settings for SCO XENIX or SCO UNIX Set up the first PLUS 8 board to interrupt on IRQ4 and use the secondary I/O address map. Set up the second PLUS 8 board, if used, to interrupt on IRQ 3 and use the primary I/O address map. This operating system requires a special PLD device, Part Number 800055-xx. Contact your Star Gate sales representative if you need this PLD. First PLUS 8 Board Settings (SCO XENIX or SCO UNIX) Position 1_OFF Position 5_OFF Position 2_OFF Position 6_OFF Position 3_ON Position 7_ON Position 4_OFF Position 8_OFF Second PLUS 8 Board Settings (SCO XENIX or SCO UNIX) Position 1_OFF Position 5_OFF Position 2_ON Position 6_OFF Position 3_OFF Position 7_ON Position 4_OFF Position 8_ON Programmable Jumper Jumper JP1 is used to select whether or not full flow control is supported for all ports or only for the first port. Install the jumper when flow control should be supported only for Port 1; remove it when flow control should be supported for all ports. Prior to shipment, this jumper is installed. System Unit Installation Once the PLUS 8 board is properly configured, it may be installed in the system unit. This is done in the following manner. Place the system unit, monitor, and all peripheral device POWER switches in the Off position. Remove the system unit, monitor, and all peripheral device line cords from the service outlets. Using the 1/4-inch nutdriver, remove the five screws located on the rear panel that secure the cover to the system unit. Carefully remove the system unit cover by sliding it toward the front. The PLUS 8 board can be installed in any full-length expansion slot. Once a slot is chosen, use the 3/16-inch nutdriver to remove the expansion slot cover plate from the rear panel. Discard the cover plate, but retain the mounting screw. Press the card guide into the corresponding holes in the front panel of the system unit. The orientation should match that of other guides already installed. Hold the PLUS 8 board by the top, align the card edge connector with the expansion slot connector, and firmly press the board straight down into the expansion slot connector. Make sure that the board is completely seated. Align the slotted hole in the PLUS 8 mounting bracket with the threaded hole in the rear panel of the system unit; then, insert the retaining screw and tighten with the 3/16-inch nutdriver. Replace the system unit cover by carefully sliding it toward the rear. Insert the five retaining screws and tighten using the 1/4-inch nutdriver. Do not reconnect the line cords until the External Panel has been connected. External Panel Connection The External Panel is connected to the PLUS 8 board with a fully shielded cable. This cable has a one-to-one pin correspondence, i.e. pin1 at one end is connected to pin 1 at the other end. Pin assignments are listed in Table 4. CAUTION Never connect or disconnect either end of this cable while power is applied to the system unit or to the peripheral devices connected to the External Panel. Otherwise, the PLUS 8 board and/or the External Panel may be damaged. Verify that all POWER switches are Off, and the line cords are removed from the service outlets. Install the interconnect cable between J1 on the External Panel and the 25-position plug on the PLUS 8 board. After the interface cable is terminated at both the External Panel and the PLUS 8 board, reconnect all line cords to the system unit, monitor, peripheral devices, and service outlets. TABLE 4 EXTERNAL PANEL CABLE WIRING Pin Function 1 Ground 2 Channel 1 Transmit Data 3 Channel 1 Receive Data 4 + 5 Volts DC 5 Transmit Data (+) 6 + 1 2 Volts DC 7 Receive Data (+) 8 - 1 2 Volts DC 9 Channel 2 Receive Data 10 Channel 2 Transmit Data 11 Channel 3 Receive Data 12 Channel 3 Transmit Data 13 Channel 4 Receive Data 14 Channel 4 Transmit Data 15 Channel 5 Receive Data 16 Channel 5 Transmit Data 17 Channel 6 Receive Data 18 Transmit Data (-) 19 Channel 6 Transmit Data 20 Receive Data (-) 21 Channel 7 Receive Data 22 Channel 7 Transmit Data 23 Channel 8 Receive Data 24 Channel 8 Transmit Data 25 Ground Peripheral Device Connection From one to eight peripheral devices may be connected to the External Panel. Each device is connected to a 25-position female receptacle wired for compliance with Electronic Industry Association (EIA) standard EIA-232 for Data Terminal Equipment (DTE). Star Gate Technologies, Inc. recommends that the interface cable used for each peripheral device have shielded cable and metalized RFI/EMI connector hoods. Noncompliance with these recommendations may result in increased RFI/EMI emissions. Refer to the RFI warning notice located near the front of this publication for cable specifications and to Figure 2 for connector orientation and nomenclature. Table 5 identifies the pin assignments for EIA-232 compliance. If a particular peripheral device does not require the modem handshake signals, only pins 2, 3, and 7 need be used. Peripheral devices may be connected to the External Panel by using the following procedure: Place the peripheral device POWER switch in the Off position. Connect the peripheral device to any one of the ports available on the External Panel. TABLE 5 EIA-232 PERIPHERAL WIRING Pin Signal Description 1 Shield Protective Ground 2 TXD Transmitted Data (output) This is a general specification for Nexus level #2 shielded, multi-conductor cable assemblies utilizing 50 each 28 AWG (7x36) single conductors and double shielding. See catalog documentation for specific multi-conductor cable assemblies. 1. D-subminiature connector, female: gold-plated socket contacts; internal plastic insulators; tin-plated external metal shell. 2. Protective strain-relief hoods: plastic material with nickel over copper plating; internal splitting ferrule to maintain shield grounding to hoods and connector shells; 4-40 captive screws with slot drive. 3 RXD Received Data (input) 4 RTS Request To Send (output) 5 CTS Clear To Send (input) 6 DSR DCE Ready (input) 7 GND Signal Ground 8 DCD Received Line Signal Detector (input) 20 DTR DTE Ready (output) 22 Rl Ring lndicator (input) No connections are made to pins not listed. 3. Tape, RF insulating: 3M P/N 1245 or engineering-approved equivalent; embossed copper. 4. Cable, shielded: single conductors, 28 AWG (7x36) stranded tinned copper with 0.010 PVC insulation shield; overall aluminum foil and 95% braid with a 24 AWG drain wire; jacket, grey PVC insulation rated 300 volts min., 80oCmin.operating temperature, UL-2464 and VW-1. 5. Drain wire to be soldered to copper tape. 6. Cable wiring: see specific catalog sheets for internal wiring diagrams and D-subminiature connector combinations. If you had ordered the EIA-422 panel box option with your PLUS 8, please use the pin-outs below instead. Note that unlisted pins have no connections. EIA-422 EXTERNAL PANEL CONNECTIONS Port Pin EIA-422 Signal Function P1 to 2 RxD- Receive Data Low P8 4 TxD+ Transmit Data High 7 TxD- Transmit Data Low 9 RxD+ Receive Data High Chapter 3 Hardware Introduction The purpose of this section is to identify and provide a functional overview of the major hardware circuits contained on the PLUS 8 board and the accompanying External Panel. Address Decoder PLD Address decoding for each UART is accomplished with a programmable logic device (PLD). Address lines A3 through A10 are decoded and gated by the address enable (AEN) signal to create eight individual chip select signals for the UARTs. The standard PLD also reads the status of DIP switch 8 to determine whether the primary or secondary I/O channel address map should be used. Since a PLD is used for this function, all UARTs do not have to be located in a contiguous I/0 address space. This is significant because the I/0 address space available in a PC system is somewhat limited. The PLD device is socketed; consequently, a custom PLD may be created and substituted for the standard PLD normally supplied. For further information on custom PLDs, please consult the factory. Interrupt Select PROM Interrupt selection is accomplished with a programmable read only memory (PROM) device. The PROM decodes each interrupt signal generated by the UARTs and produces the appropriate interrupt request to the host system. Each UART may be programmed to initiate an interrupt request on a specified interrupt level. Level selection is determined by the status of DIP switches one through six. In addition, the standard PROM contains two interrupt handling algorithms. The status of DIP switch seven determines which algorithm will be used. Custom interrupt handling can be achieved by replacing the standard PROM with a custom PROM. For further information on custom PROMs, please consult the factory. Universal Asychronous Receiver Transmitter Communication between the PLUS 8 board and each of the peripheral devices is accomplished with universal asynchronous receiver transmitter (UART) devices. Depending upon the particular version of the PLUS 8 board, there may be from one to eight UARTs installed and they may be either 8250 or 16450 type devices. Each UART provides an independent, full duplex, serial communication channel. Operating mode, data format, transmission rate, and protocol for each channel are determined completely under program control. For further information regarding the use of this device, refer to the 8250 or 16450 data sheet. Microprocessor There are two microprocessors, one on the PLUS 8 board and another on the External Panel. Each microprocessor is an 8051 single-component microcomputer having a mask-programmed read only memory (ROM). The microprocessor residing on the PLUS 8 board provides the interfaces between the host system and the UARTs while the microprocessor in the External Panel controls and monitors the physical EIA-232 interface. Both microprocessors are synchronized in a master/slave relationship. Protocol control signals are passed between the microprocessors via a high speed differential communications link. The latency imposed by this technique is approximately 450 microseconds, which is less than half the time required to receive a character transmitted at 19.2 Kb. Should one of the flow control lines change state, the change will be reported within a time frame which allows reception from the peripheral device to be temporarily suspended. Conversely, transmission to a peripheral device will be temporarily suspended if the peripheral device, by means of flow control signals, indicates that it cannot maintain the bandwidth requirement. In either case, characters will not be lost. When data is transmitted to a peripheral device, the External Panel microprocessor receives the formatted data from the microprocessor on the PLUS 8 board. Next, the RTS and DTR signals are applied to the EIA-232 line drivers where they are translated to EIA-232 levels. Then, these signals are sent over the physical link to the peripheral device. When data is being received from a peripheral device, the CTS, DSR, and RI signals are received by the EIA-232 line receivers, translated to TTL levels, and sampled by the External Panel microprocessor. The sampled data is then formatted and transmitted to the microprocessor on the PLUS 8 board for presentation to the appropriate UART. Line Drivers and Receivers The translation between TTL and EIA-232 voltage levels is accomplished with EIA-232 driver and receiver devices. When a high-quality, shielded cable is used, the line drivers are capable of driving a distance of approximately 50 feet at 19.2 kilobaud. Modem Control Interface Behavior of the flow control operation can be modified with the mode select jumper JPI. The status of this jumper selects whether full, flow control operation will be supported for all ports or only for the first port. Chapter 4 Software Optional Programs The PLUS 8 Family DOS Driver (PLUS8.SYS) is available from Star Gate Technologies, Inc. to enhance the performance, ease of use, and versatility of the PLUS 8 and PLUS 8 MC multi-port serial boards. PLUS8.SYS provides interrupt-driven, buffered input and output for multiple serial ports. It also provides an extended Communication BIOS (Interrupt 14H) and DOS device drivers for interfacing application software to the serial ports of the PLUS 8 or PLUS 8 MC. . Additional features of PLUS8.SYS include: ù Support of up to 8 ports per board ù Support of multiple boards on one or more interrupt levels ù Concurrent full duplex input and output on all ports ù Hardware (RTS/CTS) and software (XON/XOFF) flow control ù Utility programs to configure port parameters In addition, operating systems such as SCO Xenix, Interactive 386/ix, QNX, Microport UNIX, Software Link PC MOS, and Concurrent Controls Concurrent DOS support the PLUS 8 and the PLUS 8 MC adapters without the need for device driver installation. Adapters using these operating systems may need an alternate PLD device installed. See Table 3 for details. For more information, please contact a Star Gate Technologies, Inc. sales representative by calling 1-800-STAR GATE (1-800-782-7428). LIMITED WARRANTY Star Gate Technologies Inc., warrants the PLUS 8 expansion board against defective materials or workmanship for a period of one (1) year from the date of original purchase. This limited warranty is void if the board has been damaged by accident, improper modifications, neglect, improper service, or other causes not arising out of defects in material or workmanship. If this product is not in good working order as warranted above, your sole remedy shall be repair or replacement. IN NO EVENT WILL STAR GATE TECHNOLOGIES BE LIABLE TO YOU FOR ANY DAMAGES, INCLUDING LOST PROFITS, LOST SAVINGS, OR OTHER INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE SUCH A PRODUCT, EVEN IF STAR GATE TECHNOLOGIES HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES, OR ANY CLAIM BY ANY OTHER PARTY. SOME STATES DO NOT ALLOW EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LIMITATIONS ON HOW LONG AN IMPLIED WARRANTY LASTS, SO THE ABOVE LIMITATIONS OR EXCLUSIONS MAY NOT APPLY. THE FOREGOING LIMITED WARRANTY SHALL BE IN LIEU OF ANY OTHER WARRANTY, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF MERCHANTABILITY OF FITNESS FOR A PARTICULAR PURPOSE. REPLACEMENT OF NONCONFORMING GOODS, IN THE MANNER AND FOR THE PERIOD PROVIDED ABOVE, SHALL CONSTITUTE FULFILLMENT OF ALL LIABILITY OF SELLER TO BUYERS, WHETHER BASED ON CONTRACT, NEGLIGENCE OR OTHERWISE WITH RESPECT TO OR ARISING OUT OF SUCH GOODS. SOME STATES DO NOT ALLOW THE EXCLUSION OF IMPLIED WARRANTIES, SO THE ABOVE EXCLUSION MAY NOT APPLY TO YOU. THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, AND YOU MAY ALSO HAVE OTHER RIGHTS WHICH VARY FROM STATE TO STATE. SPECIFICATIONS NOTICE Star Gate Technologies does not assume any liability arising from either the application or the use of any product or circuit described in this manual. We also reserve the right to make changes to any product to improve reliability, function, or design. Therefore, specifications are subject to change without notice. This manual has been carefully checked, and its information is believed to be reliable. However, no responsibility is assumed for inaccuracies. This information does not give the purchaser any license under the patent rights of the manufacturer, or others. RFI WARNING NOTICE We recommend that all devices connected to this product have shielded cables with metal RFI/EMI connector hoods. FCC NOTICE This equipment has been tested and found to comply with the limits for a 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. 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. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense. The user is encouraged to try to correct the interference by one or more of the following measures: ù Reorient the receiving antenna. ù Move the computer further from the receiver. ù Plug the computer into an AC outlet on a different branch circuit from the receiver's. ù Reorient or shorten the peripheral equipment cables. If necessary, ask the dealer or an experienced radio/television technician for other suggestions. You may also find help in an FCC booklet called, "Interference Handbook-1990." To order this handbook, send a request for Stock Number 004-000-00482-5 to the Superintendent of Documents, U.S. Government Printing Office, Washington, D.C., 20402-9325. A fee must also be enclosed with your order. Call the U.S. Government Printing Office at (202)783-3238 to determine the amount of the fee.