Bitminter client identifies the devices by their COM number. So if they get switched then they will get the wrong settings.
I could fix this for Red Fury which reports a serial number. But I don't know how I could fix this for Antminer. I don't think there's a way to tell one device apart from the other.
Setting serials with the editor (which is available) on U1 and U2's is a pain, because you can only have 1 in the hub or USB ports at a time or the editor will not work properly.
I did one of mine to ANT0001 just to see as I wanted to be able to find the slow/misbehaving ones easy. Trouble is, they run fine
Editor is available for the silabs driver bios.
P210x Customization Utility v3.0 Release Notes
Copyright (C) 2010 Silicon Laboratories, Inc.
This release contains the following components:
* CP210xManufacturing.dll (v5.0)
* CP210xSetIDs.exe (v3.0)
* ReleaseNotes.TXT (this file)
KNOWN ISSUES AND LIMITATIONS
1.) Only CP2101, CP2102, CP2103, CP2104 and CP2105 devices are supported by this utility.
2.) CP210xManufacturing.dll must be in the same directory as CP210xSetIDs.exe.
CP210x Customization Utility v3.0 - Sep 23, 2010
Updated to include CP2105 support
Now contains version 5.0 of the CP210xManufacturing.DLL
Added Flush Buffer configuration for both CP2104 and CP2105
Added Interface String configurations for CP2105
Updated source code to Visual Studio 2005
Now contains version 4.1 of the CP210xManufacturing.DLL
Updated to include CP2104 support
Now contains version 3.5 of the CP210xManufacturing.DLL
Updated software to contain an About button for easy version access
Now contains version 3.4 of the CP210xManufacturing.DLL
No software change, but now contains version 3.3 of the CP210xManufacturing.DLL
Updated for use with version 3.0 of the CP210xManufacturing.DLL that makes use
of the 5.0 VCP driver.
Changed GetNumDevices to not return an error when there are 0 devices connected.
Fixed the "Locked Byte always 1" bug.
CP210xManufacturing DLL CP210x_GetProductString, CP210x_SetProductString,
CP210x_GetSerialNumber and CP210x_SetSerialNumber updated so that the UNICODE
options work according to documentation, length is returned as number of characters
without the NULL character.
CP210xManufacturing DLL PORT_CONFIG structure updated according to documentation.
CP210xManufacturing DLL CP210x_GetLockValue() changed to return 0x00 or 0x01.
CP210xManufacturing DLL changed to allow support for CP2013 devices.
Name of CP210x.DLL changed to CP210xManufacturing DLL.
CP2102 Support added, and renamed to show support for "CP210x" devices.
Changed CP2101 DLL to return an error if a 0 length string is passed.
GUI layout of CP2101SetIDs changed.
Max character length of the serial number changes to 63.
Max character length of the product string changes to 126.
CP2101_DEVICE_STRING type for the full path.
CP2101_PRODUCT_STRING type for the the product string.
CP2101_SERIAL_STRING type for the serial number.