AN144

Rev. 2.0

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4.1. Customizing Device Descriptors Using CP210xSetIDs.exe (CP2101/2/3/4/5)

CP210xSetIDs.exe is an example program that uses the CP210x Host API Functions implemented by

CP210xManufacturing.DLL. The program window is shown in Figure 1. CP210xSetIDs.exe demonstrates the

method of accessing and changing the descriptors contained in the connected device's programmable area. To

use CP210xSetIDs.exe, it is necessary to have the devices connected and have the unmodified device drivers that

shipped with the original CP210x kit installed. The customized device driver installation files that contain the VID

and PID values should also be installed. For information on creating customized device drivers for the CP210x,

refer to “AN220: USB Driver Customization.” The default driver must be installed so that the CP210x device with

the default factory settings appears in the device list. The customized drivers will be needed after the device IDs

have been changed and the CP210x device is reset.

All CP210x devices are programmed in the same manner using the CP210xSetIDs.exe tool, but each parameter

on the One-Time-Programmable (OTP) devices can only be programmed one time. The CP2101, CP2102, and

CP2103 parameters can be reprogrammed multiple times using the CP210xSetIDs.exe utility, but the CP2104 and

CP2105 parameters can only be programmed once using the CP210xSetIDs.exe utility. After the CP2104 and

CP2105 have been programmed once, the CP210xSetIDs.exe utility can be run, but the new values will not be

programmed into the device.

Before running CP210xSetIDs.exe, copy CP210xManufacturing.DLL into the \windows, \winnt, or \system32

directory, the directory containing the executable, or any directory in the “Path” environment variable.

Figure 1. CP210xSetIDs Example Application