Extron Electronics VN-COMMANDER - Manual (Page 50)

Section 2: System Configuration VN-COMMANDER User Guide
40 I456GB issue 8
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In the Serial Commands area, select whether the port
is to be used for incoming (INPUT) or outgoing
(OUTPUT) data, by selecting the appropriate
checkbox:
NOTE: Only one port can be used for input and only one for
output. The Current Ports area shows which ports are
currently in use. You can, if required, use the same port for
both input and output.