[GreenKeys] USB-to-serial adapters, and baudot

[Bob Camp]

Hi

A lot of different people make the chips in the USB to serial adapters. 
One of them is Cypress Semiconductor. From their data sheets:

Format 8:N:1 (no five bit no anything else at all ...)

Baud rates > 900 baud or > 9600 baud depending on the port.

The Cypress parts are used in the Keyspan USB serial ports.

Don't know if that helps or not.

	Take Care!

		Bob Camp
		KB8TQ

On Feb 28, 2005, at 9:39 PM, Lester.veenstra K1YCM wrote:

> Question: For your H-UC232S Serial Port to USB Adapter
> Does it support baud rates down to 45.5 and will it support 5 bit 
> characters?
>     Thanks
>              Lester Veenstra   K1YCM/3
> -------------------------------------------------------------------
>
> William Bytheway wrote:
>
>> I suspect that the USB hardware/software interface did not implement 
>> the
>> 16550 UART completely.  RTTYAppXP, RTTYArt and PSK31-BAUDOT all use 
>> the
>> newer data control block (DCB) structure to define the control 
>> setting for a
>> serial communications device. If the USB interface software omitted 
>> support
>> for the lower BAUD rate, then I can see why it would not work. Has 
>> anyone
>> tried contacting the USB RS232 manufacturers?  They also may have 
>> left out
>> 5-bit control as well.
>>
>> Keep in mind that the older RTTYApp used direct hardware access, 
>> which is
>> not friendly with WindowsXP.  The newer version, RTTYAppXP replaced 
>> the
>> direct calls with the Win32 functions. All are available from my web 
>> site
>> at http://207-207-72-42.ip.theriver.com .
>>
>> I have seen PCI serial port cards with real 16550 UARTS and up to 4 
>> ports
>> on the market.  These should work.
>>
>> Bill Bytheway
>> K7TTY
>>
>>
>> -----Original Message-----
>> From: gil smith [mailto:gil at baudot.net]
>> Sent: Monday, February 28, 2005 8:27 AM
>> To: Veenstra, Lester
>> Cc: bythewayb at readysetsurf.com; teletype at buzbee.net;
>> greenkeys at mailman.qth.net
>> Subject: RE: [GreenKeys] USB-to-serial adapters, and baudot
>>
>> . . . .
>>
>>
>>
>
> -- 
> Lester Veenstra
> Senior Engineering Program Manager
> Intelsat General
> 6550 Rock Springs Drive, Suite 450
> Bethesda Maryland, 20817
> +1-301-571-1212
> e-mail: lester.veenstra at intelsatgeneral.com
>
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