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Corvalent Gator 550-G Installation Manual

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Gator 550-G
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Installation Guide

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  • Page 1 Gator 550-G Motherboard Installation Guide...

  • Page 3: Table Of Contents

    ATA-Disk Connector Voltage Selection......5 LCD Power Voltage Selection.......... 5 Step 2 DRAM and Cables Installation Gator 550-G Memory Configuration........ 6 Installing Cables ............... 7 Power and Control Panel Cables ........7 Installing Peripheral Cables..........7 Index of Connectors ............9...
  • Page 4 Gator 550-G – Installation Guide Chapter 3 Upgrading ....37 Upgrading the System Memory........37 Appendix A Technical Specifications ........39 Chipset ................39 Bios .................. 40 Embedded I/O ..............40 Miscellaneous ..............42 Memory Map ..............43 DMA Channels..............43 I/O Map ................

  • Page 5: Notice

    Introduction Notice The company reserves the right to revise this publication or to change its contents without notice. Information contained herein is for reference only and does not constitute a commitment on the part of the manufacturer or any subsequent vendor. They are in no way responsible for any loss or damage resulting from the use (or misuse) of this publication.

  • Page 6: Introduction

    Gator 550-G – Installation Guide Introduction Thank you for your purchase of the Gator 550-G industrial embedded motherboard. The Gator 550-G design was based on the SiS550 SoC (System on Chip) providing the ideal platform to industrial low power applications.
  • Page 7 One on-board 10/100 Ethernet and four serial ports (one optional RS422/485). Static Electricity Warning! The Gator 550-G has been designed as rugged as possible but can still be damaged if jarred sharply or struck. Handle the motherboard with care. The Gator 550-G also contains delicate electronic circuits that can be damaged or weakened by static electricity.
  • Page 8 Gator 550-G – Installation Guide Gator 550-G - An Overview The Gator 550-G represents the ultimate in industrial embedded motherboard technology. No other system board available today provides such impressive list of features: SiS550 Overview • The single chipset, SiS550 family, provides a high...
  • Page 9 Introduction On-Board CRT & LVDS video controller • Standard CRT video controller . • Standard LCD interface. • Dedicated Local Flat Panel (LFP) LVDS interface (optional). On-Board Ethernet • On-board 10/100 Ethernet. Conventions Used in this Manual Notes - Such as a brief discussion of memory types. Important Information - such as static warnings, or very important instructions.

  • Page 10: Chapter 1 Pre-Configuration

    Gator 550-G. Topics discussed include: installing the DRAM and jumper settings. Handling Precautions The Gator 550-G has been designed to be as rugged as possible but it can be damaged if dropped, jarred sharply or struck. Damage may also occur by using excessive force in performing certain installation procedures such as forcing the system board into the chassis or placing too much torque on a mounting screw.
  • Page 11 Gator 550-G – Installation Guide TAKE PROPER PRECAUTIONS! Work on a conductive surface that is connected to the ground. Before touching any electronic device, ground yourself by touching an unpainted metal object or, and highly recommended, use a grounding strap.

  • Page 12: Step 1 Setting The Jumpers

    Step 1 Setting the Jumpers Your Gator 550-G is equipped with a large number of peripherals and has the ability to run at a variety of speeds without the need to change any crystals or oscillators (Speeds can be set in the BIOS, the maximum core speed is determined by the SoC installed).

  • Page 13: Jumper Locations

    Gator 550-G – Installation Guide Jumper Locations Use the diagram below and the tables on the following pages to locate and set the on-board configuration jumpers. Figure 1-1 Jumper Locations...

  • Page 14: Cmos Reset

    Chapter 1: Pre-Configuration CMOS Reset This option is provided as a convenience for those who need to reset the CMOS registers. It should always be set to "Normal" for standard operation. If the CMOS needs to be reset, turn off the system, move JP33 to 2-3, turn the system on, move jumper to 1-2 and press reset.

  • Page 15: Step 2 Dram And Cables Installation

    Gator 550-G – Installation Guide Step 2 DRAM and Cables Installation Depending upon how your Gator 550-G is configured you may need to install the µDIMM. Gator 550-G Memory Configuration The Gator 550-G offers 1 µDIMM memory socket (Location J12 - Back side or solder side–...

  • Page 16: Installing Cables

    Chapter 1: Pre-Configuration Installing Cables Power and Control Panel Cables The Gator 550-G gets power from the power connector J34 (Figure 1- Installing Peripheral Cables Connect the combined flat cables to their connectors and to the other end. This concludes the hardware installation of your Gator 550-G system.
  • Page 17 Gator 550-G – Installation Guide Figure 1-3 Location of Components and Connectors...

  • Page 18: Index Of Connectors

    Chapter 1: Pre-Configuration Index of Connectors Please refer to Appendix A for pin-out descriptions. Table 1-4 Connectors descriptions Connector Description Reset µDIMM Slot (Back side) LCD Panel LVDS Panel PC104+ IDE 44pin Combined FDD/USB/COM4/IrDA Combined COM1/COM2/COM3/Audio Ethernet 10/100 Combined VGA/Keyboard/Mouse/LPT Power Button Power +12Vcc RTC Battery...
  • Page 19 Gator 550-G – Installation Guide User's Notes:...

  • Page 20: Chapter 2 Hiflex Bios Setup

    Chapter 2 HIFLEX BIOS Setup Your Gator 550-G features AMI BIOS. The system configuration parameters are set via the HIFLEX AMIBIOS setup. Since HIFLEX BIOS Setup resides in the ROM BIOS, it is available each time the computer is turned on.

  • Page 21: Standard Setup

    Gator 550-G – Installation Guide functions are described in this chapter. Some options may not be available in your BIOS. The windows are: • Standard CMOS Setup • Advanced CMOS Setup • Advanced Chipset Setting • Power Management Setup •...

  • Page 22: Advanced Cmos Setup

    Chapter 2:BIOS Configuration configure the drive. Auto will automatically detect your hard drive every time the computer boots. If required, a specific Hard Drive type may be selected. Boot Sector Virus Protection The options are either Enabled or Disabled. Advanced CMOS Setup Advanced CMOS Setup options are displayed by choosing the Advanced CMOS Setup option from the AMIBIOS Setup main menu.
  • Page 23 2nd Boot Device 3rd Boot Device 4th Boot Device These options set the drive boot sequence that Gator 550-G attempts to boot from after AMIBIOS POST completes. The settings are Disabled, 1st IDE, 2nd IDE, 3rd IDE, 4th IDE, Floppy, ARMD-FDD, ARMD-HDD, ATAPI-CDROM, SCSI, Network and I2O.
  • Page 24 Chapter 2:BIOS Configuration Add-On ROM Display Mode Set this option to display add-on ROM (read-only memory) messages. The Optimal and Fail-Safe default setting is Force BIOS. An example of this is a SCSI BIOS or VGA BIOS. Force BIOS Set this value to allow the computer system to force a third party BIOS to display during system boot.
  • Page 25 Gator 550-G – Installation Guide when a keyboard is not attached. This option permits you to configure workstations with no keyboards. Primary Display This option configures the type of video card attached to the computer. The settings are Mono, CGA40x25, CGA80x25, VGA/EGA (default) and Absent.

  • Page 26: Advanced Chipset Setup

    Chapter 2:BIOS Configuration System BIOS Cacheable When set to Enabled, the contents of the F0000h system memory segment can be read from or written to cache memory. The content of this memory segment is always copied from the BIOS ROM to system RAM for faster execution. The setting is either Enabled or Disabled.

  • Page 27: Power Management Setup

    Gator 550-G – Installation Guide SiS550 Timing Settings Several timing settings for memory management. Please, don’t change the default settings unless necessary. SiS550 VGA Settings Graphic Win Size 4M, 8M, 16M, 32M, 64M(default). Share Memory Size Disabled, 4M, 8M, 16M (default), 32M and 64M.
  • Page 28 Chapter 2:BIOS Configuration Power Switch Type This option specifies how the power button mounted externally on the computer chassis is used. The settings are: On/Off and suspend. The default setting is On/Off. ACPI Aware O/S Set this value to allow the system to utilize the Intel ACPI (Advanced Configuration and Power Interface) specification.

  • Page 29: Pci/Plug And Play Setup

    Gator 550-G – Installation Guide are Disabled, 1 Min (minutes) and all one-minute intervals up to and including 15 Min. The default setting is Disabled. RTC Alarm Resume From Soft Off Enable or Disable (default). RTC Alarm Date RTC Alarm Hour...
  • Page 30 Chapter 2:BIOS Configuration Plug and Play Aware OS Set this option to Yes if the operating system installed in the computer is Plug and Play-aware. AMIBIOS only detects and enables PnP ISA adapter cards that are required for system boot. The Windows 95 and 98 operating systems detect and enable all other PnP-aware adapter cards.
  • Page 31 Gator 550-G – Installation Guide Slot2, Slot3, Slot4, Slot5 and Slot6. If Auto is selected, AMIBIOS automatically determines the correct setting for this option. Off-board PCI IDE Primary IRQ This option specifies the PCI interrupt used by the primary IDE channel on the off-board PCI IDE controller.

  • Page 32: Peripheral Setup

    Chapter 2:BIOS Configuration remove an IRQ from the pool of available IRQs passed to devices that are configurable by the system BIOS. If more IRQs must be removed from the pool, the end user can use these options to reserve the IRQ by assigning an ISA/EISA setting to it.
  • Page 33 Gator 550-G – Installation Guide system. Set this value to enable or disable the Legacy USB Support. The Optimal and Fail-Safe default setting is Auto. Disabled Set this value to prevent the use of any USB device in DOS or during system boot.

  • Page 34: Auto Detect Hard Disk

    Chapter 2:BIOS Configuration Serial Port4 Address This option specifies the base I/O port address of serial port 4. The settings are Disabled, 3F8h, 2F8h, 3E8h and 2E8h. Serial Port4 IRQ This option specifies the IRQ of serial port 4. The settings are 3, 4, 5 and 7.

  • Page 35: Change User Password

    Gator 550-G – Installation Guide channel installed in the system. AMIBIOS automatically configures the drive parameters after it has detected these parameters. Change User Password Select the Change User Password from the Security section of the AMIBIOS Setup main menu. Enter the password and press <Enter>.

  • Page 36: Auto Configuration With Fail-Safe Settings

    Chapter 2:BIOS Configuration Auto Configuration with Fail-Safe Settings You can load the Fail-Safe AMIBIOS Setup option settings by selecting the Fail-Safe option from the Default section of the AMIBIOS Setup main menu. The Fail-Safe settings provide far from optimal system performance, but are the most stable settings.
  • Page 37 Gator 550-G – Installation Guide Checkpoint Description Code The NMI is disabled. Power on delay is starting. Next, the initialization code checksum will be verified. Initializing the DMA controller, performing the keyboard controller BAT test, starting memory refresh, and entering 4 GB flat mode next.
  • Page 38 Chapter 2:BIOS Configuration Next, searching for the AMIBOOT.ROM file in the root directory. The AMIBOOT.ROM file is not in the root directory. Next, reading and analyzing the floppy diskette FAT to find the clusters occupied by the AMIBOOT.ROM file. Next, reading the AMIBOOT.ROM file, cluster by cluster.
  • Page 39 Gator 550-G – Installation Guide The keyboard controller command byte is written. Next, issuing the Pin 23 and 24 blocking and unblocking command. Next, checking if <End or <Ins> keys were pressed during power on. Initializing CMOS RAM if the Initialize CMOS RAM in every boot AMIBIOS POST option was set in AMIBCP or the <End>...
  • Page 40 Chapter 2:BIOS Configuration Completed post-video ROM test processing. If the EGA/VGA controller is not found, performing the display memory read/write test next. The EGA/VGA controller was not found. The display memory read/write test is about to begin. The display memory read/write test passed. Look for retrace checking next.
  • Page 41 Gator 550-G – Installation Guide The amount of memory below 1 MB has been found and verified. Determining the amount of memory above 1 MB memory next. The amount of memory above 1 MB has been found and verified. Checking for a soft reset and clearing the memory below 1 MB for the soft reset next.
  • Page 42 Chapter 2:BIOS Configuration Completed 8259 interrupt controller initialization. Extended NMI source enabling is in progress. The keyboard test has started. Clearing the output buffer and checking for stuck keys. Issuing the keyboard reset command next. A keyboard reset error or stuck key was found. Issuing the keyboard controller interface test command next.
  • Page 43 Gator 550-G – Installation Guide Initialization before the C800 adaptor ROM gains control has completed. The adaptor ROM check is next. The adaptor ROM had control and has now returned control to BIOS POST. Performing any required processing after the option ROM returned control.
  • Page 44 Chapter 2:BIOS Configuration Checkpoint Description Code Code copying to specific areas is done. Passing control to INT 19h boot loader next. Table 2-4 Bus Checkpoint Codes The system BIOS passes control to different buses at the following checkpoints: Checkpoint Description Code Initializing the different bus system, static, and output devices, if present.
  • Page 45 Gator 550-G – Installation Guide Bits Description 0000 Function 0. Disable all devices on the bus. 0001 Function 1. Initialize static devices on the bus. 0010 Function 2. Initialize output devices on the bus. 0011 Function 3. Initialize input devices on the bus.

  • Page 46: Chapter 3 Upgrading

    Chapter 3: Upgrading Chapter 3 Upgrading Upgrading the System Memory The Gator 550-G allows an upgrade of the system memory. The following describes the Integrated DRAM controller: # Supports 1 Double Sided µDIMM (2 Rows Memory) # Supports PC100/PC133 SDRAM Technology...
  • Page 47 Gator 550-G – Installation Guide User's Notes:...

  • Page 48: Appendix A Technical Specifications

    Appendix A: Technical Specifications Appendix A Technical Specifications Chipset Core Logic SiS550 SoC. Integrated x86 Compatible CPU # x86 Instruction Set Compatible Processor # High Performance with Advanced Architectures # Superscalar Execution # Three Superpipelined Integer Units # Pipelined Floating Point Unit # Innovative Instruction Decode and Branch Prediction # Separate Code and Data Caches # Support for Bus Frequency up to 100MHz...

  • Page 49: Bios

    Gator 550-G – Installation Guide # 8/16- Bit DMA Data Transfer # Distributed DMA Support Integrated Interrupt Controller # Two 8259A Compatible Interrupt Controllers # Level- Or Edge-Triggered Programmable Serial IRQ # Interrupt Sources Re-Routable to Any IRQ Channel Three 8254 Compatible Programmable 16-Bit Counters...
  • Page 50 Appendix A: Technical Specifications # Supports Multiword DMA Mode 0, 1, 2 # Supports Ultra DMA 33/66/100 Floppy One floppy disk drive. Sizes supported are: 5.25" 360K and 1.2MB; 3.5" 720K, 1.44MB and 2.88MB. Serial Ports Four high speed 16550 compatible UARTS. BIOS configurable as COM1 - 4.

  • Page 51: Miscellaneous

    Gator 550-G – Installation Guide Miscellaneous CMOS/Battery Integrated Real Time Clock (RTC) with 256B CMOS SRAM # Supports ACPI Day-Of-Month and Month-Of-Year Alarm # 256 Bytes Of CMOS SRAM # Provides RTC H/W Year 2000 Solution RTC with lithium battery. No external battery is required.

  • Page 52: Memory Map

    Appendix A: Technical Specifications Memory Map Address Address Range Range Size Description Decimal Hexadecimal 0F0000- 960K-1M 64 KB Upper BIOS 0FFFFF 0E0000- 896K-960K 64 KB Lower BIOS 0EFFFF Expansion 0C0000- 768K-896K 128 KB Card BIOS 0DFFFF and Buffer Standard 0A0000- PCI/ISA 640K-768K 128 KB...

  • Page 53: I/O Map

    Gator 550-G – Installation Guide I/O Map Address (hex) Description 0000-000F DMA 1 0020-0021 Interrupt Controller 1 0040 Timer/Counter 0 0041 Timer/Counter 1 0042 Timer/Counter 2 0043 Timer Control Word 0060 Keyboard Controller Byte _ Reset IRQ 0061 NMI Status and Control...

  • Page 54: Pci Configuration Space Map

    Appendix A: Technical Specifications Address (hex) Description 03D4-03D5 Video (VGA) 03DA Video (VGA) 03E8-03EF COM3 (if selected) 03F0-03F5 Floppy Channel 1 03F6 Primary IDE channel command port 03F7 Floppy Channel 1 command 03F7, bit 7 Floppy disk change channel 1 03F7, bits 6:0 Primary IDE channel status report 03F8-03FF...

  • Page 55: Interrupts

    Gator 550-G – Installation Guide Interrupts System Resource I/O channel check Reserved, interval timer Reserved (keyboard) Reserved (cascade) COM2* COM1* User Available Floppy Drive LPT1* Real time clock User Available User Available User Available PS/2 mouse port (if present, else user available)

  • Page 56: Smbus

    Appendix A: Technical Specifications SMBUS Device Slave Address DIMM0 01010000b Clock Chip Write 11010010b Clock Chip Read 11010011b Connectors Pin-out How to identify pin number 1: Looking to the solder side (The board side without components) of the PCB (Printed Circuit Board), pin number 1 will have a squared pad .
  • Page 57 Gator 550-G – Installation Guide Table A-9 J14 LCD Connector Pin# LCD Header – J14 LCDVCC LCDVCC LCDVCC LCDVCC VVBD7 VVBD6 VVBD5 VVBD4 VVBD3 VVBD2 VVBD1 VVBD0 VVBD11 VVBD10 VVBD9 VVBD8 LP/HSYNC SHFCLK ENBLT FLM/VSYNC MOD/LDE THSYNC LLD0 TVSYNC UUD4...
  • Page 58 Appendix A: Technical Specifications Pin# LCD Header – J14 XCLK LLD5 LLD6 LLD7 LLD2 LLD3 LLD4 LLD1 UUD5 UUD2 UUD0 UUD1 UUD6 UUD7 Table A-10 J27 Ethernet Header Connector Pin# Ethernet Header – J27 Termination Shorted to pin 1 Termination Shorted to pin 5 A+L VCC3 LED_LINK...
  • Page 59 Gator 550-G – Installation Guide Table A-11 J30 VGA/KB/MS/LPT Pin# VGA/KB/MS/LPT Header – J30 1-26 -STROBE AUTOFEED +DATA BIT 0 ERROR +DATA BIT 1 INIT +DATA BIT 2 SLCT IN +DATA BIT 3 +DATA BIT 4 +DATA BIT 5 +DATA BIT 6...
  • Page 60 Appendix A: Technical Specifications Pin# VGA/KB/MS/LPT Header – J30 KBDATA 39-50 GREEN BLUE HSYNC VSYNC DDC Power DDC DATA DDC CLK...
  • Page 61 Gator 550-G – Installation Guide Table A-12 LVDS Backlight, Power Button, Reset, Battery and Main Power. Connector Description LVDS Backlight 1)+12Vcc 2)GND 3)Enable Power Button 1)GND 2)PWRBTN Reset 1)GND 2)RESET Battery 1)VBAT 2)GND Main Power +12Vcc 1-Center)+12Vcc 2)GND Table A-13 J37 LPC Pin# LPC –...
  • Page 62 Appendix A: Technical Specifications Table A-14 J20 LVDS Connector (optional) Pin# LVDS Header – J20 LCDVCC LCDVCC TXCLK+ TXCLK- TX2+ LCDVCC LCDVCC TX2- TX1+ TX1-...
  • Page 63 Gator 550-G – Installation Guide Pin# LVDS Header – J20 TX0+ TX0- Table A-15 J26 COM1/COM2/COM3/Audio Connector COM1/COM2/COM3/Audio Header Pin# – J26 1-10 COM1 11-20 COM2...
  • Page 64 Appendix A: Technical Specifications COM1/COM2/COM3/Audio Header Pin# – J26 21-30 COM3 DCD - RS-422/485RXB(opt.) RX - RS-422/485TXB(opt.) TX - RS-422/485TXA(opt.) RI – RS-422/485RXA(opt.) 30-40 AUDIO MIC IN CD IN Left CD IN Right CD GND MIC BIAS LINE IN Left LINE IN Right Headphone OUT Left Headphone OUT Right...
  • Page 65 Gator 550-G – Installation Guide Table A-16 J25 FDD/USB/COM4 Pin# FDD/USB/COM4/IrDA Header – J25 1-20 LDRQ DSKCHG RDATA WPRTCT DRV S0 MTR0 TRK0 INDEX SIDE1 WGATE WDATA STEP DENSEL0 21-30 DATA0- DATA1- DATA0+ DATA1+...
  • Page 66 Appendix A: Technical Specifications Pin# VGA/KB/MS/LPT Header – J30 31-39 COM4 40-50 IrDA IRMODE IRRX IRTX...
  • Page 67 Gator 550-G – Installation Guide User's Notes:...

  • Page 68: Appendix B Flash Bios Programming

    Appendix B Flash BIOS programming The Gator 550-G offers the optional FLASH BIOS. When installed, you will be able to update your BIOS without having to replace the EPROM. The AMIBIOS will read the new BIOS file from a floppy disk, replace the old BIOS and reboot your computer.
  • Page 69 Gator 550-G – Installation Guide Table B-1 Flash BIOS Beep Errors Beeps Description Insert diskette in floppy A: The AMIBOOT.ROM file was not found in the root directory of floppy drive A: Base memory error Flash program successful Floppy read error...

  • Page 70: Appendix C On-Board Video

    Appendix C: On-board Video Appendix C On-board Video The Gator 550-G offers standard CRT and LCD connections and an optional LVDS interface. For pin out descriptions of the CRT, LCD and LVDS interfaces, please check appendix A. The following is a description of the video capabilities of SiS550: Integrated A.G.P.
  • Page 71 Gator 550-G – Installation Guide # Direct DVD to TV Playback # Supports Two Independent Video Windows with Overlay Function and Scaling Factors # Supports YUV-To-RGB Color Space Conversion # Supports Bi-Linear Video Interpolation with Integer Increments of Pixel Accuracy...

  • Page 72: Appendix D On-Board Industrial Devices

    Appendix E: Ethernet Appendix D On-Board Industrial Devices The Gator 550-G features two industrial devices: A 10/100 Ethernet controller and four serial ports (one RS-422/485 optional). On-board Ethernet The Gator 550-G features a built-in 10/100 Ethernet controller (SiS900). Features Integrated Fast Ethernet controller and 10/100 megabit per second (Mbps) Physical Layer Transceivers for the PCI local bus •...
  • Page 73 Gator 550-G – Installation Guide • Automatic Jam and IEEE 802.3x Auto-Negotiation for flow control • Single access to complete PHY register set • Built-in waveform shaping requires no external filters • Single 25Mhz clock for 10 and 100 Mbps operation.

  • Page 74: Serial Ports

    Appendix D: Industrial Devices Serial Ports The Gator 550-G features four serial ports (one RS-422/485 optional). TIA/EIA-232 RS is the abbreviation for recommended standard. Usually, it is based on or is identical to other standards, e.g., EIA/TIA-232-F. TIA/EIA- 232, previously known as RS-232 was developed in the 1960’s to interconnect layers of the interface (ITU–T V.11), but also the pignut of...
  • Page 75 Gator 550-G – Installation Guide Protocol Different from other purely electrical-layer-standards, TIA/EIA-232 defines not only the physical layer of the interface (ITU-T V.11), but also the pinout of the appropriate connectors (25-pin D-type or 9-pin DB9S) (ISO 2210) and the protocol (ITU-T V.24). The interface standard specifies also handshake and control lines in addition to the 2 unidirectional receive data line (RD) and transmit data line (TD).
  • Page 76 Appendix D: Industrial Devices a low cost ribbon cable. For longer distances and/or noisy environments, shielding and additional ground lines are essential. Twisted pair cables are recommended for line lengths of more than 1 meter. TIA/EIA-422 TIA/EIA-422 (RS-422) allows a multi-drop interconnection of one driver, transmitting unidirectionally to up to 10 receivers.
  • Page 77 Gator 550-G – Installation Guide Protocol Not applicable/none specified. RS-422 is Differential and may be either Point-to-Point or Multi- Drop Connected Differential, Point-to-Point Differential, Multi-Drop Differential Transmission For balanced or differential transmission, a pair of signal lines is necessary for each channel. On one line, a true signal is transmitted, while on the second one, the inverted signal is transmitted.
  • Page 78 Appendix D: Industrial Devices Due to the common mode rejection capability of a differential amplifier, this noise will be rejected. Additionally, since the signal line emits the opposite signal like the adjacent signal return line, the emissions cancel each other. This is true in any case for crosstalk from and to neighboring signal lines.
  • Page 79 Gator 550-G – Installation Guide unit loads of 12 kΩ, equal to 32 standard nodes or even higher count with increased input impedance. The maximum total load should not drop below 52 Ω. The common-mode voltage levels on the bus have to maintain between –7 V and 12 V.
  • Page 80 Appendix D: Industrial Devices Termination Resistors Follow instructions in the previous RS-422 and RS-485 sections. The termination resistors available are rated to 120Ω. Ground Connections All 422- and 485-compliant system configurations shown up to this point do not have incorporated signal-return paths to ground. Obviously, having a solid ground connection so that both receivers and drivers can talk error free is imperative.
  • Page 81 Gator 550-G – Installation Guide User's Notes:...
  • Page 83 MN-G55PC-01...

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