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Digi Rapidport Installation Manual page 11

Usb to 4-port modem module

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The driver supports COM port number assignment in two ways:
1. Assign COM ports based on converter serial number.
This is the default setting. In this mode, the driver uses the serial number of each converter to uniquely identify
it, and the COM port assignments for a given converter are based on its serial number. No matter which
physical USB port a converter is plugged into, it will maintain its assigned COM port numbers.
2. Assign COM ports based on physical USB port.
In this mode, the driver identifies a converter based on the physical USB port it is plugged into. This effectively
assigns COM port numbers to physical USB ports. No matter which converter is plugged into a given USB port,
it will use the COM port numbers assigned to that USB port. This permits a converter to be to be replaced with
a new unit, and, although the new unit has a different serial number, it will receive the same COM port
assignments as the old unit because they were both plugged into the same USB port.
When using this mode, converters are identified not by their serial number, but by a 2-7 digit number that
identifies which USB port it is plugged into.
After changing this setting, you will need to reboot before the change takes effect.
Rapidport Installation Guide (90000665 Rev. C) – Page 9

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