Terminal Emulator And Com Port Problems - Gateway 850 User Manual

Terminal emulator and COM port
problems
Symptom
Screen
continuously puts
out garbage
characters.
Nothing is
displayed on the
terminal emulator
screen.
Screen is
updated, but will
not respond to
keystrokes.
Reason
The likely cause of this
problem is a baud rate
mismatch between the
terminal emulator and the
controller. The default
baud rate is 115,200.
Follow the
troubleshooting steps to
the right if you set your
terminal emulator to this
rate and still get garbage
characters:
The probable cause of
this problem is a bad
RS-232 cable connection
or swapped
transmit/receive lines.
Incorrect setting.
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Terminal emulator and COM port problems

Solution
If you are able, shut down the controller. If
you are unable to shut down the controller,
continue to the next step.
Turn off the power to the enclosure
containing the controller.
Press the spacebar of your terminal emulator.
Turn on the power while continuing to press
the spacebar. This will allow the controller to
auto-detect the baud rate setting.
When the Flash Utility appears, select option
5 to continue to boot the controller.
Some terminal emulators do not immediately
change to the new baud rate settings, and
you have to exit and restart the emulator to
use the new settings.
If the cable is correctly connected on both
ends, try another null modem cable.
Make sure that you are not using a straight
through RS-232 cable.
Disable hardware flow control on the terminal
or terminal emulator. The controller supports
XON/XOFF flow control and works correctly
in most cases with no flow control.
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