Re: non-standard baud rates with Prolific 2303 USB-serial

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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 <johan@xxxxxxxxxx> 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:
> > On 2/23/21 11:14 AM, Johan Hovold wrote:
> > > 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




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