Multi-Tech Systems MULTIVOIP MVP-2410 - Manual (Page 114)

Software Installation MultiVOIP User Guide
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7. On the next screen you can select the COM port that the command PC
will use when communicating with the MultiVoip unit. After software
installation, the COM port can be re-set in the MultiVOIP Software (from
the sidebar menu, select Connection | Settings to access the COM Port
Setup screen or use the keyboard shortcut Ctrl + G).
NOTE: If the COM port setting made
here conflicts with the actual COM port
resources available in the command PC,
this error message will appear when the
MultiVOIP program is launched. If this
occurs, you must reset the COM port.