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

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To: Boszormenyi Zoltan <zboszor@freemail.hu>
Date:	25 Aug 2003 12:19:36 +0200

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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• Previous message: Mario Mikocevic: "Re: OOPS 2.6.0-test4 repeatable"
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