Troubleshooting and Testing 9
Table 2–1 (Cont.) Troubleshooting the VT420
Symptom Probable Cause Solution
Character Display Problems
While on-line
with the host,
the screen
displays different
characters than
those typed. (The
terminal works in
local mode.)
Incorrect transmit
and receive
speeds.
Incorrect bits
per character or
parity setting.
Stop bits setting
is incorrect.
Terminal board.
Set the speeds to match the host, in
the Communications Set-Up screen.
Set the data bits/parity feature
to match the host, in the
Communications Set-Up screen.
Set the stop bits feature to match
the host, in the Communications
Set-Up screen.
Replace the terminal board (3.3).
When using the
copy and paste
feature, the
pasted characters
do not match
the characters
selected. (VMS
environment)
Transmit speed
is set to 19200
baud, causing
the terminal to
send characters
faster than the
host computer can
receive them.
Using the VMS operating system,
type the following command at the $
prompt: SET TERMINAL/HOSTSYNC
Messages are
garbled and
reverse question
marks appear on
the screen.
Baud rate is
incorrect.
Check the transmit and receive
speeds in the Communications
Set-Up screen.
XON/XOFF flow
control is not
enabled.
Terminal board.
Enable XON/XOFF flow control
with the XOFF feature in the
Communications Set-Up screen.
Replace the terminal board (3.3).
Other Problems
F11
(
Esc
) does
not work when
running self-tests.
Incorrect mode
settings
Select Local in the Global Set-Up
screen. Select VT100 Mode in the
General Set-Up screen.
Section numbers follow the solution.
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