PL2303HXD
          ===>Device Descriptor<===
bLength:                           0x12
bDescriptorType:                   0x01
bcdUSB:                          0x0110
bDeviceClass:                      0x00  -> This is an Interface Class
Defined Device
bDeviceSubClass:                   0x00
bDeviceProtocol:                   0x00
bMaxPacketSize0:                   0x40 = (64) Bytes
idVendor:                        0x067B = Prolific Technology, Inc.
idProduct:                       0x2303
bcdDevice:                       0x0400



PL2303TA
          ===>Device Descriptor<===
bLength:                           0x12
bDescriptorType:                   0x01
bcdUSB:                          0x0200
bDeviceClass:                      0x00  -> This is an Interface Class
Defined Device
bDeviceSubClass:                   0x00
bDeviceProtocol:                   0x00
bMaxPacketSize0:                   0x40 = (64) Bytes
idVendor:                        0x067B = Prolific Technology, Inc.
idProduct:                       0x2303
bcdDevice:                       0x0300


PL2303HX(A)/XA ( EOL : PHASED OUT SINCE 2012 )
          ===>Device Descriptor<===
bLength:                           0x12
bDescriptorType:                   0x01
bcdUSB:                          0x0110
bDeviceClass:                      0x00  -> This is an Interface Class
Defined Device
bDeviceSubClass:                   0x00
bDeviceProtocol:                   0x00
bMaxPacketSize0:                   0x40 = (64) Bytes
idVendor:                        0x067B = Prolific Technology, Inc.
idProduct:                       0x2303
bcdDevice:                       0x0300


You can use the two fields bcdUSB & bcdDevice to distinguish PL2303HXD
/ PL2303TA / PL2303HX(A)/XA

Johan Hovold [off-list ref] 於 2021年2月24日 週三 上午12:51寫道：

On Tue, Feb 23, 2021 at 11:30:41AM -0500, Michael G. Katzmann wrote:

quoted

On 2/23/21 11:14 AM, Johan Hovold wrote:

quoted

I only have an HXD (and a GC) here.

The HXD has bcdUSB as 1.10 unlike your TA with 2.00, but not sure that
helps.

Sound promising .. why do you think this is this not reliable?

Perhaps it is. Perhaps even bcdDevice of 3.00 is enough (includes some
older variants that the TA replaced supposedly). Not sure anyone ever
tried the current scheme on those older models.

Charles, could you post the output of "lsusb -v" for your PL2303TA? And
did you verify that you actually got 110 Bd with the current Linux
driver?

Johan