Troubleshooting Terminal, Printer and Serial Device Connections - Edition 4 (32022-90030)

Chapter 4 53
TermDSM Commands
DI[AG] T[ERMINAL]
Any time that you want to stop the diagnostic, press [CTRL]-Y. The
diagnostics prompt will be printed and you will be allowed to enter
another subcommand.
This diagnostic function tests the connection between the DTC port up
to and including some terminal functions. (It is not a thorough terminal
test.) It does this by writing a string of characters to the terminal and
ordering the terminal to send those characters back for comparison.
The string of characters sent by TermDSM is preceded by:
[ESC]-H [ESC]-J
which homes the cursor on the screen and clears the screen. Then the
character string:
ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_'abcdefghijklmnopqrstuvwxyz
is written to the terminal, followed by:
[ESC]-H [ESC]-D
which homes the cursor and causes the terminal to return the character
string. (Sending
[ESC]-D to the terminal is the same as pressing
[Return].)
If TermDSM knows that this test has failed, an error message will be
printed listing the reason for the failure and how many milliseconds the
test ran before failing.
The diagnostics prompt will be printed and you will be allowed to enter
another subcommand.