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However, to make matters even more annoying, the PL2303 chip, which typically identifies itself as VID 067B and PID 2303, reports PID 0609 in this device, making it impossible to recognize this as a standard serial to usb converter.The easiest solution for this is to modify the drivers so that they identify also with that PID. In Linux this is pretty easy and as I write this PID 0609 is already associated with the pl2303 driver by default.In Windows some inf modding does the trick. Download the drivers from the Prolific website, install them and use search for the file ser2pl.inf. This will typically reside in a folder containg 4 or 5 files. You can copy this folder as one if you want to keep it as a single 'driver package'. Inside the inf, replace all occurences of of PID_2303 with PID_0609 and use the Device Manager to assign the driver to the modem.For me, this worked in Windows XP but not in Windows 7 64 bit. After some searching around, it seems that the PL2303 can be connected to an EEPROM chip for some customisation (just like the FTDI converter chips). Any non-standard USB PID is written in there. If you want to change it back, you need to rewrite this EEPROM. This can be done from within Windows using a tool I found on edaboard but the only prerequisite is that the device is already recognized as a PL2303 USB to Serial converter. So in my case I had to rewrite the EEPROM from within Windows XP with a modified .inf driver.
- Include Drivers, EEPROM Writer and User Manual NOTE: Requires PL2303RA OTP Converter Board. PL2303 Family Support Documents. End User License Agreement (“EULA”). Linux Kernel 2.4.31 and above already includes built-in drivers for PL-2303 (VID067B&PID2303). NOTE: Google Android OS is also based on Linux kernel so it also includes PL2303.
- Eeprom writer program pl2303 manufacturers and eeprom writer program pl2303 suppliers Directory - Find eeprom writer program pl2303 Manufacturers, Exporters and eeprom writer program pl2303 suppliers on ECOL.com.
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Prolific Pl2303 Eeprom Writer
Below is a screenshot of the EEPROM writer after pressing the read button on the non-modified usb modem. Just change PID to 2303 and write everything back. You can find a copy of the tool in the attachment section under this post.
Pl2303 Eeprom Writer Program Download
The OTPROM can be programmed twice using the dedicated PL2303RA EEPROM Writer utility software which can be requested from Prolific or authorized distributors The PL2303RA supports versatile data formats and has a programmable baud rate generator. The supported data formats are shown on Table 7. The EEPROM writer (1.0.0.3) uses the PL-2303 to write USB descriptors to an external EEPROM. You might not have an EEPROM connected to the PL-2303. I know my USB to serial adapter doesn't have one.