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          TITLE:    Troubleshooting Terminals
   DOCUMENT ID#:    FYI-M-1905
           DATE:    28DEC92
        PRODUCT:    DR Multiuser DOS
PRODUCT VERSION:    5.x
     SUPERSEDES:    13APR92

        SYMPTOM:    Terminal does not respond or garbage characters
appear on screen

  ISSUE/PROBLEM:  

1.   Make sure the user has the DR Multiuser DOS Business Update of
     September, 1991 for version 5.0 or has DR Multiuser DOS 5.1.

2.   Cable is frequently a problem.  A 5-wire null modem cable is
     needed.The pin configuration is shown on page B-3 of the DR
     Multiuser DOS User Guide.  It is highly recommended that the
     protocol be DTR/DSR.

3.   For troubleshooting purposes ONLY, the user could construct a
     cable with the following configuration:

        25 pin PC end           Terminal end (DB25)

        Transmit    2  -------- 3     Receive
        Receive     3  -------- 2     Transmit
        Ground      7  -------- 7     Ground

     Using this cable, and setting the protocol (both in SETUP and
     on the terminal) to NONE, it will be possible to see whether
     any signal at all is going from the main CPU to the terminal. 
     (Protocol may be referred to as Flow Control.)

4.   Another good test of signal transmission is to define the port
     into which the malfunctioning terminal is plugged as a
     Printer/Aux port (so the terminal is treated by the system as
     a serial printer), in SETUP. Reboot, select the correct
     printer number (from another terminal) using the PRINTER or
     PRINTMAP command on the working terminal, and type DIR > PRN. 
     The directory should "print" on screen of the terminal in
     question.

5.   Refer to Chapter 3 in the DR Multiuser DOS User Guide for
     setup specifications.

6.   If a PC or terminal is having trouble at higher baud rates,
     set the baud rate (in Setup and on the terminal/PC) to 9600.

7.   In Setup, make sure that the question "Does this terminal
     support graphics" is answered correctly.  For standard
     monochrome terminals, such as a Wyse 60/150, the answer is NO. 
     For a Wyse 370 to support graphics, its personality must be
     set to GR/CGA.  A PC in Terminal Emulation mode can be
     configured for color graphics use, by selecting
     Emulation=PC/CGA in PCTERM.