Mitsubishi Electric MELFA CR750 Series User Manual page 458

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The Oscillograph cannot be used when the communication method is set to High speed.
In Windows Firewall setting, change to allow that RT ToolBox2 (MELFA_RT.exe) can receive.
Check item or cause
Show the following screen by selecting
[Control panel] -> [System and Security] ->
[Windows Firewall] -> [Allow a program or
feature through
Windows7).
Is there [RT ToolBox2] in [Allowed programs
and features] list and allow the communication
range of the use environment?
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Windows Firewall] (for
Solution
If there is not [RT ToolBox2] in [Allowed programs and
features] list, click [Allow another program] button.
If [Allow another program] button is disabled, click
[Change settings] button first.
Select and add [RT ToolBox2] on [Add a program]
screen.
Set the check boxes according to the use environment
of [Home/Work (Private)] and [Public] ON.
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