Re: How to use an USB<->serial adapter?

[Daniel Egger <degger@fhm.edu>]

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Am Mon, 2003-08-25 um 08.24 schrieb Boszormenyi Zoltan:

> What product is this? Mine is a Wiretek UN8BE, based on Prolific 2303.

Mine is from STLAB.

Bus 002 Device 003: ID 7b06:0323
  Language IDs: none (invalid length string descriptor 63; len=7)
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB              10.01
  bDeviceClass            0 Interface
  bDeviceSubClass         0
  bDeviceProtocol         0
  bMaxPacketSize0         8
  idVendor           0x7b06
  idProduct          0x0323
  bcdDevice            2.02
  iManufacturer           0
  iProduct                0
  iSerial                 0
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           39
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0
    bmAttributes         0xa0
      Remote Wakeup
    MaxPower              100mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           3
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass      0
      bInterfaceProtocol      0
      iInterface              0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               none
        wMaxPacketSize         10
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               none
        wMaxPacketSize         64
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               none
        wMaxPacketSize         64
        bInterval               0
  Language IDs: none (invalid length string descriptor 63; len=7)

Hrm, lsusb seems to have an endianess problem, the vendorid is garbled.

> In the shop they said this one cannot be used as a null-link but works
> with external serial devices, e.g. modems. I have yet to verify this
> statement myself.

Doesn't really make sense to me. RS232 is specified electrically, the
adapter doesn't know which kind of device it is talking to. I'm using
mine to connect to a TTL-RS232 adapter which sits on a DSL-router, so
it's like a "null-link".

> I tried to query the USB serial line's current parameters.
> Is there any other utilities that can do this for me?

Why do you need this, don't you know what you set it to? :)
There are ioctls for it and probably a terminal program will know how to
read and write it.

-- 
Servus,
       Daniel

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