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Chassis Plans ATXP-875P Technical Reference

Long life industrial motherboard
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ATXP-875P
Long Life Industrial Motherboard
Revision A
Technical Reference
®
Intel
Pentium 4
With Hyper-Threading
Embedded Processors
Intel 875P Chipset

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  • Page 1 ATXP-875P Long Life Industrial Motherboard Revision A Technical Reference ® Intel Pentium 4 With Hyper-Threading Embedded Processors Intel 875P Chipset...
  • Page 2 In no event shall Chassis Plans be liable for any defect in hardware or software or loss or inadequacy of data of any kind, or for any direct, indirect, incidental or consequential damages arising out of or in connection with the performance or use of the product or information provided.
  • Page 3 This manual is as complete and factual as possible at the time of printing; however, the IABILITY information in this manual may have been updated since that time. Chassis Plans reserves ISCLAIMER the right to change the functions, features or specifications of their products at any time, without notice.

  • Page 5: Table Of Contents

    Audio Jack Output Selection......................4 On-board Ethernet 10/100 (optional 1Gb) Enabling................. 4 Step 2 SDRAM, CPU, and Cables Installation ..............5 ATXP-875P Memory Configuration....................5 CPU Installation ........................... 5 Installing Cables ..........................6 Power and Control Panel Cables ....................... 6 Installing Peripheral Cables .......................
  • Page 6 Introduction ATXP-875P – Technical Reference Appendix B Flash BIOS programming and codes ............. 63 Troubleshooting POST ........................64 Critical Error BEEP Codes........................ 69 Appendix C On-Board Industrial Devices ................70 Post Code Display ..........................70 Watchdog Timer ..........................70 On-board Ethernet..........................71 Serial Ports............................

  • Page 7: Notice

    ATXP-875P Technical Reference 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.

  • Page 8: Introduction

    Thank you for your purchase of the ATXP-875P industrial embedded motherboard. The ATXP-875P design was based on the Intel 875P chipset providing the ideal platform to industrial applications. The ATXP-875P design is based on the Intel Pentium 4 (mPGA478) processor.

  • Page 9: Cpu Support

    Introduction Static Electricity Warning! The ATXP-875P has been designed as rugged as possible but can still be damaged if jarred sharply or struck. Handle the motherboard with care. The ATXP-875P also contains delicate electronic circuits that can be damaged or weakened by static electricity.
  • Page 10 Introduction ATXP-875P – Technical Reference Conventions Used in this Manual Notes - Such as a brief discussion of memory types. Important Information - such as static warnings, or very important instructions. When instructed to enter keyboard keystrokes, the text will be noted by this graphic.

  • Page 11: Chapter 1 Pre-Configuration

    CPU (if necessary), DRAM installation and jumper settings. Handling Precautions The ATXP-875P 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 12: Step 1 Setting The Jumpers

    Setting the Jumpers Your ATXP-875P is equipped with a large number of peripherals. As such, there are a large number of configuration jumpers on the board. Taken step by step, setting these jumpers is easy. We suggest you review each section and follow the instructions.

  • Page 13: Jumper Locations

    ATXP-875P Technical Reference Chapter 1: Pre-Configuration 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 Chassis Plans...

  • Page 14: Cmos Reset

    Chapter 1: Pre-Configuration ATXP-875P – Technical Reference 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 J9H1 to 2-3, turn the system on, move jumper to 1-2 and press reset.

  • Page 15: Step 2 Sdram, Cpu, And Cables Installation

    All Intel thermal solution specifications, design guidelines and suggestions to the CPU being used must be followed. The ATXP-875P warranty is void if the thermal management does not comply with Intel requirements.

  • Page 16: Installing Cables

    Then connect remaining ends of the ribbon cable to the appropriate peripherals. This concludes the hardware installation of your ATXP-875P system. Now it is a good time to re-check all of the cable connections to make sure they are correct.
  • Page 17 ATXP-875P Technical Reference Chapter 1: Pre-Configuration Figure 1-3 ATXP-875P I/O Gasket Chassis Plans...
  • Page 18 Chapter 1: Pre-Configuration ATXP-875P – Technical Reference Figure 1-4 Location of Components and Connector Chassis Plans...

  • Page 19: Index Of Connectors

    ATXP-875P Technical Reference Chapter 1: Pre-Configuration Connector Index Please refer to Appendix A for pin-out descriptions. Table 1-6 Connectors description Connector Description GPIO Header J1A1 (Bottom)Keyboard – PS/2 (Top)Mouse – PS/2 J1B1 Rear Chassis Fan J1D1 J2F1 CPU Fan (Bottom) USB (Ports 0 & 1) - (Top) Ethernet 1 (Optional 1Gb)
  • Page 20 Chapter 1: Pre-Configuration ATXP-875P – Technical Reference User's Notes: Chassis Plans...

  • Page 21: Chapter 2 Amibios Setup

    Chapter 2 AMIBIOS Setup Your ATXP-875P features American Megatrends AMIBIOS. The system configuration parameters are set via the BIOS setup. Since the BIOS Setup resides in the ROM BIOS, it is available each time the computer is turned on. American Megatrends’s AMIBIOS brand BIOS (Basic Input/Output System) pre-boot firmware is the industry’s standard product used by most designers of X86 computer equipment in the world today.
  • Page 22 Chapter 2: BIOS Configuration ATXP-875P – Technical Reference The <F8> key on your keyboard is the Fail-Safe key. It is not displayed on the ezPORT key legend by default. To set the Fail-Safe settings of the BIOS, press the <F8> key on your keyboard. It is located on the upper row of a standard 101 keyboard.

  • Page 23: Chapter 2

    ATXP-875P Technical Reference Chapter 2:BIOS Configuration Chassis Plans...

  • Page 24: Main Setup

    Chapter 2: BIOS Configuration ATXP-875P – Technical Reference Main Setup When you first enter the ezPORT Setup Utility, you will enter the Main setup screen. You can always return to the Main setup screen by selecting the Main tab. There are two Main Setup options.
  • Page 25 ATXP-875P Technical Reference Chapter 2:BIOS Configuration IDE Configuration This item specifies the IDE channels used by the onboard PCI IDE controller and the onboard PCI SATA controller. Disabled Set this value to prevent the computer system from using the onboard IDE controller.
  • Page 26 Chapter 2: BIOS Configuration ATXP-875P – Technical Reference P-ATA & S-ATA Select this option to enable 2 PATA channels and 2 SATA channels. Combined Mode Option This item specifies which interface will be configured as the 1 channel. PATA is first channel Default.
  • Page 27 ATXP-875P Technical Reference Chapter 2:BIOS Configuration ATA (PI) 80 pin Cable Detection Set this option to select the method used to detect the ATA (PI) 80 pin cable. The Optimal and Fail-Safe setting is Host & Device. Host & Device Set this value to use both the motherboard onboard IDE controller and IDE disk drive to detect the type of IDE cable used.
  • Page 28 Chapter 2: BIOS Configuration ATXP-875P – Technical Reference Type This option sets the type of device that the AMIBIOS attempts to boot from after the Power-On Self-Test (POST) has completed. The Optimal and Fail-Safe default setting is Auto. Not Installed Set this value to prevent the BIOS from searching for an IDE disk drive on the specified channel.
  • Page 29 ATXP-875P Technical Reference Chapter 2:BIOS Configuration DMA Mode This setting allows you to adjust the DMA mode options. The Optimal and Fail-Safe default setting is Auto. Auto Allows the BIOS to auto detect the DMA mode. Use this value if the IDE disk drive support cannot be determined.
  • Page 30 Chapter 2: BIOS Configuration ATXP-875P – Technical Reference ARMD Emulation Type ATAPI Removable Media Device (ARMD) is a device that uses removable media, such as the LS120, MO (Magneto-Optical), or Iomega Zip drives. If you want to boot up from media on an ARMD, it is required that you emulate boot up from a floppy or hard disk drive.
  • Page 31 ATXP-875P Technical Reference Chapter 2:BIOS Configuration Serial Port1 Address This option specifies the base I/O port address and Interrupt Request address of serial port 1. The Optimal setting is 3F8/IRQ4. The Fail-Safe default setting is Disabled. Disabled Set this value to prevent the serial port from accessing any system resources. When this option is set to Disabled, the serial port physically becomes unavailable.
  • Page 32 Chapter 2: BIOS Configuration ATXP-875P – Technical Reference Parallel Port Address This option specifies the I/O address used by the parallel port. The Optimal setting is 378. The Fail-Safe setting is Disabled. Disabled Set this value to prevent the parallel port from accessing any system resources. When the value of this option is set to Disabled, the printer port becomes unavailable.
  • Page 33 ATXP-875P Technical Reference Chapter 2:BIOS Configuration ICH SIO Serial Port2 Address This option specifies the base I/O port address and Interrupt Request address of serial port 4. The Optimal setting is 2E8/IRQ7. The Fail-Safe default setting is Disabled. Disabled Set this value to prevent the serial port from accessing any system resources. When this option is set to Disabled, the serial port physically becomes unavailable.
  • Page 34 Chapter 2: BIOS Configuration ATXP-875P – Technical Reference Advanced ACPI Configuration You can use this screen to select options for the ACPI Advanced Configuration Settings. Use the up and down <Arrow> keys to select an item. Use the <Plus> and <Minus> keys to change the value of the selected option. A description of the selected item appears on the right side of the screen.
  • Page 35 ATXP-875P Technical Reference Chapter 2:BIOS Configuration MPS CONFIGURATION SCREEN MPS Configuration Screen You can use this screen to select options for the MPS settings. Use the up and down <Arrow> keys to select an item. Use the <Plus> and <Minus> keys to change the value of the selected option.

  • Page 36: Pci/Pnp Setup

    Chapter 2: BIOS Configuration ATXP-875P – Technical Reference PCI/PnP Setup Select the PCI/PnP tab from the ezPORT setup screen to enter the Plug and Play BIOS Setup screen. You can display a Plug and Play BIOS Setup option by highlighting it using the <Arrow> keys.
  • Page 37 ATXP-875P Technical Reference Chapter 2:BIOS Configuration OffBoard PCI/ISA IDE Card Set this value to allow the OffBoard PCI/ISA IDE Card to be selected. The Optimal and Fail-Safe default setting is Auto. Auto This setting will auto select the location of an OffBoard PCI IDE adapter card. This is the default setting.
  • Page 38 Chapter 2: BIOS Configuration ATXP-875P – Technical Reference Reserved Memory Size Set this value to allow the system to reserve memory that is used by ISA devices. The optimal and Fail-Safe default setting is Disabled. Disabled Set this value to prevent BIOS from reserving memory to ISA devices.
  • Page 39 ATXP-875P Technical Reference Chapter 2:BIOS Configuration PCI Slot-3 IRQ Preference Set this value to the preferred IRQ to be used by a device plugged in the PCI Slot-3. The optimal and fail-safe default is Auto. Auto PCI Slot-4 IRQ Preference Set this value to the preferred IRQ to be used by a device plugged in the PCI Slot-4.

  • Page 40: Boot Setup

    Chapter 2: BIOS Configuration ATXP-875P – Technical Reference Boot Setup Select the Boot tab from the ezPORT setup screen to enter the Boot BIOS Setup screen. You can select any of the items in the left frame of the screen, such as Boot Device Priority, to go to the sub menu for that item. You can display an Boot BIOS Setup option by highlighting it using the <Arrow>...
  • Page 41 ATXP-875P Technical Reference Chapter 2:BIOS Configuration Wait for ‘F1’ If Error Set this value to allow the Wait for ‘F1’ Error setting to be modified. The Optimal and Fail-Safe default setting is Enabled. Disabled This prevents the ezPORT to wait on an error for user intervention. This setting should be used if there is a known reason for a BIOS error to appear.

  • Page 42: Security Setup

    Chapter 2: BIOS Configuration ATXP-875P – Technical Reference HARD DISK DRIVES Hard disk drives Use this screen to view the hard disk drives in the system. To access this screen, select Hard disk drives on the Boot Setup screen and press <Enter>.
  • Page 43 ATXP-875P Technical Reference Chapter 2:BIOS Configuration Change Supervisor Password Select this option and press <Enter> to access the sub menu. You can use the sub menu to change the supervisor password. Change User Password Select this option and press <Enter> to access the sub menu. You can use the sub menu to change the user password.

  • Page 44: Chipset Setup

    Chapter 2: BIOS Configuration ATXP-875P – Technical Reference Clear User Password Select Clear User Password from the Security Setup menu and press <Enter>. Clear New Password [Ok] [Cancel] appears. Type the password and press <Enter>. The screen does not display the characters entered. Retype the password as prompted and press <Enter>.
  • Page 45 ATXP-875P Technical Reference Chapter 2:BIOS Configuration Primary Graphics Adapter Set this value to allow the Primary video device to be selected. The Optimal and Fail-Safe default setting is AGP. This setting will force any PCI video card to be the primary video device.
  • Page 46 Chapter 2: BIOS Configuration ATXP-875P – Technical Reference D000, 16k Shadow Select the type of cache scheme to be used for this memory range. The optimal and fail-safe default is disabled. Disabled. Uncached. Write Protect Cached. Write Through Cached. Write Back Cached.

  • Page 47: Exit Menu

    ATXP-875P Technical Reference Chapter 2:BIOS Configuration Onboard AC97 Audio Set this option to Enable or Disable the on board Audio AC97 controller. If Audio is enabled, certain OSs will require a driver installation on every boot. Auto This setting will keep the onboard Audio Controller enabled. This is the default setting.
  • Page 48 Chapter 2: BIOS Configuration ATXP-875P – Technical Reference User's Notes: Chassis Plans...

  • Page 49: Chapter 3 Upgrading

    Since the ATXP-875P features CPU auto-sensing device there is no jumper to be set when changing the CPU. Upgrading the System Memory The ATXP-875P allows an upgrade of the system memory with up to 4GB SDRAM DDR DIMM modules in four memory slots with the following features: System Memory Features: •...

  • Page 50: Addressable Memory

    ATXP-875P – Technical Reference Addressable Memory The ATXP-875P utilizes 4 GB of addressable system memory. Typically the address space that is allocated for PCI add-in cards, AGP aperture, BIOS (firmware hub), and chipset overhead resides above the top of DRAM (total system memory).
  • Page 51 ATXP-875P: Upgrading Chapter 3:Upgrading Memory Configurations The ATXP-875P 875P MCH component provides two features for enhancing memory throughput: • Dual Channel memory interface. The board has two memory channels, each with two DIMM sockets, as shown in Figure 3-1. •...
  • Page 52 Chapter 3: Upgrading ATXP-875P – Technical Reference When the MCH is configured to operate in Dynamic Paging mode, Front-Side Bus (FSB) to Memory Bus address mapping undergoes a significant change compared to that of in a linear operating mode (normal operating mode). In non-dynamic paging mode, the Rank selection (Rank or ROW indicates the side of a DIMM) via chip select signals, is done based on the size of the ROW.
  • Page 53 ATXP-875P: Upgrading Chapter 3:Upgrading Figure 3-3 Examples of Dual Channel Configuration without Dynamic Mode Throughput Level Configuration Characteristics Dual Channel with Dynamic All DIMMs matched Highest Mode • DIMMs matched from Channel A to ↑ Dual Channel without Dynamic Channel B Mode •...
  • Page 54 Chapter 3: Upgrading ATXP-875P – Technical Reference Figure 3-4 Examples of Single Channel Configuration with Dynamic Mode Throughput Level Configuration Characteristics All DIMMs matched Highest Dual Channel with Dynamic Mode • DIMMs matched from Channel A to ↑ Channel B Dual Channel without Dynamic Mode •...
  • Page 55 ATXP-875P: Upgrading Chapter 3:Upgrading Figure 3-5 Examples of Single Channel Configuration without Dynamic Mode Throughput Level Configuration Characteristics Dual Channel with Dynamic All DIMMs matched Highest Mode ↑ • DIMMs matched from Channel A to Channel B Dual Channel without •...
  • Page 56 Chapter 3: Upgrading ATXP-875P – Technical Reference User Notes: Chassis Plans...

  • Page 57: Appendix A Technical Specifications

    ATXP-875P Technical Reference Appendix A: Technical Specifications Appendix A Technical Specifications Chipsets Core Logic North Bridge - Intel 875P. South Bridge – Intel 6300ESB I/O Controller Hub. Peripheral I/O Standard Microsystems (SMSC) LPC47M192. BIOS System BIOS American Megatrends AMIBIOS. Flash BIOS Standard feature for System BIOS.
  • Page 58 The BIOS supports Logical Block Addressing (LBA) and Extended Cylinder Head Sector (ECHS) translation modes. The drive reports the transfer rate and translation mode to the BIOS. The ATXP-875P supports Laser Servo (LS-120) diskette technology through the Parallel ATA IDE interfaces. The BIOS supports booting from an LS-120 drive.
  • Page 59 ATXP-875P Technical Reference Appendix A: Technical Specifications USB Interfaces Four Universal Serial Bus connectors. USB 1.1 and USB 2.0 compliant. On-board Ethernet Two RJ45 Ethernet connectors (second 10/100/1000 optional, first optional 10/100/1000). On-board Buzzer Audio Audio (AD1985B) AC97 compliant. Microphone In, Stereo Line In and Out, Auxiliary CD/Audio In.

  • Page 60: Industrial Devices

    Appendix A: Technical Specifications ATXP-875P – Technical Reference Industrial Devices Temperature and Voltage Device Automatic CPU voltage & temperature monitoring device (optional). Power Management Power button function: advanced power management support. General Purpose I/O lines Ten general purpose I/O lines in a header.

  • Page 61: Mechanical Drawing

    ATXP-875P Technical Reference Appendix A: Technical Specifications Mechanical Drawing Chassis Plans...

  • Page 62: Memory Map

    Appendix A: Technical Specifications ATXP-875P – Technical Reference 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...

  • Page 63: I/O Map

    ATXP-875P Technical Reference Appendix A: Technical Specifications 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...

  • Page 64: Pci Configuration Space Map

    Appendix A: Technical Specifications ATXP-875P – Technical Reference PCI Configuration Space Map Bus # Device # Function # Description 00 and 06 875P Memory Controller 875P Host to AGP Bridge PCI to CSA Bridge PCI-X Bridge ICH USB UHC 1...

  • Page 65: Smbus

    ATXP-875P Technical Reference Appendix A: Technical Specifications SMBUS Device Slave Address 00101101b DIMM0 Channel A 01010000b DIMM1 Channel A 01010001b DIMM0 Channel B 01010010b DIMM1 Channel B 01010011b Clock Chip Write 11010010b Clock Chip Read 11010011b PCI Interrupt Routing Map...

  • Page 66: Connectors Pin-Out

    Appendix A: Technical Specifications ATXP-875P – Technical Reference 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 67 ATXP-875P Technical Reference Appendix A: Technical Specifications Table A-11 J9F1 USB Ports 2 & 3 Header Connector Pin# USB Header – J9F1 +5V – USB2 +5V – USB3 -D – USB2 -D – USB3 +D – USB2 +D – USB3 GROUND –...
  • Page 68 Appendix A: Technical Specifications ATXP-875P – Technical Reference Table A-14 J13 Ethernet 2(optional) RJ45 Pin# Ethernet RJ45 – J13 TX1+ TX1- RX1+ TX2+ TX2- RX1- RX2+ RX2- Table A-15 J3 USB/Ethernet 1 (optional 1Gbe) Connector Pin# USB Connector – J3A +5V –...
  • Page 69 ATXP-875P Technical Reference Appendix A: Technical Specifications Table A-16 J7 Keyboard/Mouse Header Connector Pin# Keyboard/Mouse Header – J7 Mouse CLK Keyboard CLK HDD LED Keyboard Data Mouse Data Table A-17 J4A1 Parallel DB25 Connector Pin# Parallel DB25F – J4A1 -STROBE...
  • Page 70 Appendix A: Technical Specifications ATXP-875P – Technical Reference Table A-18 J1 GPIO Header Connector Pin# GPIO Header – J1 GPIO24 GPIO25 GPIO27 GPIO37 GPIO38 GPIO39 GPIO40 GPIO41 GPIO42 GPIO43 Table A-19 CPU Fan, Rear Chassis Fan, Intruder, and Speaker. Connector...
  • Page 71 ATXP-875P Technical Reference Appendix A: Technical Specifications Table A-20 J14 Front Panel Header Connector Pin# Front Panel Header – J14 HDD LED Anode Power LED Green Blink HDD LED Cathode Power LED Yellow Blink Reset - GND Power Switch Reset Power Switch - GND Infra Red Rx (Opt.)
  • Page 72 Appendix A: Technical Specifications ATXP-875P – Technical Reference User Notes: Chassis Plans...

  • Page 73: Appendix B Flash Bios Programming And Codes

    The ATXP-875P offers the standard FLASH BIOS. When installed, you will be able to update your BIOS without having to replace the EEPROM. The AMIBIOS will read the new BIOS file from a floppy disk during boot and replace the old BIOS.

  • Page 74: Troubleshooting Post

    Appendix B: Flash Bios ATXP-875P – Technical Reference Troubleshooting POST AMIBIOS writes progress codes, also known as POST codes, to I/O port 80h during POST, in order to provide information to OEM developers about system faults. These POST codes may be monitored by the On-board POST Display.
  • Page 75 ATXP-875P Technical Reference Appendix B: Flash BIOS Table B-2 Bootblock Recovery Code Checkpoints The Bootblock recovery code gets control when the BIOS determines that a BIOS recovery needs to occur because the user has forced the update or the BIOS checksum is corrupt. The following table describes the type of...
  • Page 76 Appendix B: Flash Bios ATXP-875P – Technical Reference Table B-3 POST Code Checkpoints The POST code checkpoints are the largest set of checkpoints during the BIOS pre-boot process. The following table describes the type of checkpoints that may occur during the POST portion of the BIOS:...
  • Page 77 ATXP-875P Technical Reference Appendix B: Flash BIOS Initialize RTC date/time. Test for total memory installed in the system. Also, Check for DEL or ESC keys to limit memory test. Display total memory in the system. Mid POST initialization of chipset registers.
  • Page 78 Appendix B: Flash Bios ATXP-875P – Technical Reference Table B-4 DIM Code Checkpoints The Device Initialization Manager (DIM) gets control at various times during BIOS POST to initialize different system busses. The following table describes the main checkpoints where the DIM module is accessed:...

  • Page 79: Critical Error Beep Codes

    ATXP-875P Technical Reference Appendix B: Flash BIOS Table B-5 ACPI Runtime Checkpoints ACPI checkpoints are displayed when an ACPI capable operating system either enters or leaves a sleep state. The following table describes the type of checkpoints that may occur during ACPI sleep or wake events:...

  • Page 80: Appendix C On-Board Industrial Devices

    Post Code Display The POST code display is a device implemented on the ATXP-875P to help on failure diagnostics. A POST code is transmitted by the BIOS during the POST (Power On Self Test). It is a number that refers to the state or test condition of a circuit or group of circuits.

  • Page 81: On-Board Ethernet

    Appendix C: Communication Devices On-board Ethernet The ATXP-875P features two 10/100/1000 Ethernet controllers. Ethernet controller 1 is an Intel 82559ER 10/1000 (or 82551ER), that may optionally be upgraded to an Intel 82540EM, which is a 10/100/1000Mbps device. The optional Ethernet controller 2 is the Intel 82547GI 10/100/1000 Ethernet controller.

  • Page 82: Serial Ports

    ATXP-875P – Technical Reference Serial Ports The ATXP-875P has four fixed RS-232 serial ports (RS-422/485 optional on SER C and SER D). 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.
  • Page 83 ATXP-875P Technical Reference Appendix C: Communication Devices Advantages of Single-Ended Transmission The advantages of single-ended transmission are simplicity and low cost of implementation. A single-ended system requires only one line per signal. It is therefore ideal for cabling, and connector costs are more important than the data transfer rate, e.g.
  • Page 84 Appendix C: Communications Devices ATXP-875P – Technical Reference 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 85 ATXP-875P Technical Reference Appendix C: Communication Devices TIA/EIA-485 Historically, TIA/EIA-422 was on the market before TIA/EIA-485. Due to the lack of bi-directional capabilities, a new standard adding this feature was created: TIA/EIA-485 . The standard (TIA/EIA-485-A or ISO/IEC 8284) defines the electrical characteristics of the interconnection, including driver, line, and receiver. It allows data rates in the range of 35 Mbps and above and line lengths of up to 1200 m.
  • Page 86 Appendix C: Communications Devices ATXP-875P – Technical Reference 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.

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