Epson Q50188015-1 Serial Port (RS-232CPort) Check, D-16

Insert the loop-back connector. Then press Y and Enter to start the check.

The computer checks the port by writing and reading data and control information, and reports errors for any pins that are faulty.

Serial Port (RS-232C Port) Check

Use this option to test the functions of the primary serial communications (RS-232C) port.

To perform the test, you must insert a special loop-back connector into the serial port so that the computer can check the individual pins of the port. Contact your dealer if you need a loop-back connector. Note that a different loop-back connector is required to test the parallel port.

When you select option 11 from the DEVICE LIST menu, you see this message:

Attach loop-back connector to serial port. Enter Y to start this check when connector is attached, or

Enter N to return to the menu.

Insert the loop-back connector. Then press Y and Enter to start the check.

First, the computer checks the serial port control lines to see that they are able to change from high to low and vice versa. No messages are displayed during this part of the test unless an error occurs.

The second test is an echo back check during which the port sends data to itself in a fixed data format, at all the possible baud rates. When this test begins, you see this message:

RS232C echo back check - at various baud rates Current baud rate is 75

Current test data is 00

D-16

Performing System Diagnostics

Contents

Page User’s Guide IMPORTANT NOTICE DISCLAIMER OF WARRANTY COPYRIGHT NOTICE TRADEMARKS Copyright 0 1988 by Epson America, Inc FCC COMPLIANCE STATEMENT FOR AMERICAN USERS Note: WARNING Page Contents 4 Using MS-DOSwith Your Equity Ie Contents Appendixes D Performing System Diagnostics F Formatting a User-installedHard Disk Contents Introduction How to Use This Manual Where to Get Help Setting Up Your System 1 Unpacking 2 Choosing a Location 3 Connecting the Keyboard 4 Connecting a Monitor 5 Connecting a Printer Connecting to the parallel interface Connecting to the serial interface 6 Connecting the Power Cord Page 7Inserting the Startup Diskette 8 Starting the System POWER Initial screen display Enter Enter 9 Copying System Diskettes Copying with one diskette drive Setting Up Your System Page Preparing a Hard Disk for Use Creating the MS-DOSPartition Formatting the MS-DOSPartition WARNING, ALL DATA ON NON-REMOVABLEDISK DRIVE C: WILL BE LOST Copying the Reference and Operating 2 Files Booting From the Hard Disk Using the Equity Ie Special Keys on the Equity Ie Keyboard The following table describes special keys on the Equity Ie keyboard lab ‘2 Caps Lock Alt Backspace Selecting Execution Speed Using Diskettes Caring for diskettes Inserting and removing diskettes Making backup copies Write-protectingdiskettes Using Using a Hard Disk Drive Caring for the hard disk Protecting the data on your hard disk Resetting the Computer Turning Off the Computer Moving the Computer Page Using MSDOS with Your Equity Ie Starting and Exiting MS-DOS Changing the Default Drive The MS-DOSCommand Format parameters Entering MS-DOSCommands Storing Data Using Directories Page Listing the contents of a directory Using pathnames Creating directories Changing directories Copying from one directory to another Using MS-DOSwith Your Equity Ie Formatting Diskettes Formatting diskettes with a hard disk and one diskette drive Formatting diskettes with two diskette drives Using MS-DOS with Your Equity Ie with Enter. You Formatting diskettes with one diskette drive (no hard disk) Formatting Enter. You see Copying Data Using DISKCOPY with one diskette drive: Using the COPY command Page Using the BACKUP command Using the Epson HELP Utility PgUp ESC Using the Epson MENU Utility Running MENU from a diskette MENU utility options Using the XTREE Utility Running XTREE XTREE Ctrl-D Using an AUTOEXEC.BAT File Creating an AUTOEXEC.BAT file If you have a hard disk: If you do not have a hard disk: Page Installing Option Cards Removing the Cover A-2 Installing Option Cards Installing an Option Card A-4 Zmtulling Option Cards Removing an Option Card Replacing the Cover Troubleshooting The Computer Won’t Start The Computer Locks Up Video Problems Diskette Problems Hard Disk Problems Software Problems Printer Problems Option Card Problems Power-OnDiagnostics System Device Check Clock and CMOS RAM Check RAM Check Keyboard Controller and Keyboard Check Video and Video Controller Check Parallel Port Check Serial Port Check Diskette Drive Seek Check Hard Disk Controller and Hard Disk Check Performing System Diagnostics Starting System Diagnostics l - System board Memory Enter. If Modifying the DEVICE LIST D-2 Performing System Diagnostics Selecting a Test Resuming From an Error System Board Check Memory Check Keyboard Check Video Check Attribute check Character set check D-8 400column character set check 320x200 graphics mode check Performing D-9 640x200 graphics mode check D-10 640x480 graphics mode check Enter Enter Monochrome/Color video check To check your monochrome or color video, press 8 and then Enter Floppy Disk Drives and Controller Check FLOPPY DISK DRIVE(S) AND CONTROLLER CHECK MENU Sequential seek check D-13 Random seek check Write, read check D-14 Math Coprocessor (8087) Check Parallel Port (Printer Interface) Check Serial Port (RS-232CPort) Check Alternate Serial Port Check Dot-MatrixPrinter Check Hard Disk Drives and Controller Check Read, verify check D-20 Alternate Parallel Port Check Parallel Port (on Video Adapter) Check Exiting System Diagnostics Error Codes and Messages Video-adapter % d’sp’ay Floppy disk drives and controller Math coprocessor Specifications Main Unit Interfaces Keyboard Mass Storage Power Requirements Environmental Requirements Characteristics Video Display Formatting a User-installedHard Disk Starting the Hard Disk Format Formatting and Checking Options Conditional Format (Normal) =246g DOUBLE CHECK THAT YOU HAVE BACKUP DISKETTE COPIES OF ALL YOUR FILES F-4 Formatting a User-InstalledHard Disk Unconditional Format Formatting a User~instulled Hard Disk F-7 Destructive Surface Analysis =2459 Formutting a User-installed Hard Disk Hard F-9 Non-destructiveSurface Analysis Glossary Boot Character CMOS Code Command Current directory Cursor Cylinders Data Data diskette Operating See Diskette High-density Input/output (I/O) port Interface Joystick Keyboard Megahertz (MHz) Memory Microprocessor Modem Monitor Interface Program Prompt RAM Read Read/write head interface Parallel VGA Wildcard Write Write-protect GL-11 Index Ctrl Ctrl-AH-Del Ctrl-C Ctrl-Alt-Del Ctrl-C IN-3 IN-4 Index IN-5 Index IN-7 RESET IN SPEED IN-10 Reader Comment Card Equity Ie User’s Guide EPSON