Question about modems

Nigel Johnson nw.johnson at ieee.org
Wed Nov 13 12:13:18 CST 2019


Not much in the manual.  I browsed it looking for anything about data 
bits and stop bits. Nothing.

p1-2: ' Commands given to the Smartmodem must be ASCII coded at baud 
rates between 110 baud and 1200 baud. Once 'on-line', any code at any 
speed from 0 to 300 baud may be used.'

p 9-1 'Do not send any data to the Smartmodem while it is in local 
command mode unless the data is intended to be a command. Random data 
can confuse the baud rate detector and the command decoder giving 
unpredicatable results.'

That is al lI can find i nthe manual.

cheers,

Nigel


On 13/11/2019 12:39, Jim Brain via cctalk wrote:
> On 11/13/2019 5:31 AM, Nigel Johnson via cctalk wrote:
>> I actually have an original Hayes 300 modem. Would it be any use if I 
>> could set it up for a a test, or would it need another genuine Hayes 
>> one to talk to for what you need?
>
> I looked at the SmartModem 300.  It looks like it completely detected 
> the speed and parity internal to the unit.  If you have a manual or a 
> link ot one to validate, I think that would suffice. If it did do 
> that, then it would have reconfigured itself to match the terminal and 
> thus all communication would be in the same format (8N1, 7E1, etc).
>
>
> I did a quick check for an online manual, but my Google-fu is weak today.
>
> Jim
>
  

-- 
Nigel Johnson
MSc., MIEEE
VE3ID/G4AJQ/VA3MCU

Amateur Radio, the origin of the open-source concept!


You can reach me by voice on Skype:  TILBURY2591

If time travel ever will be possible, it already is. Ask me again yesterday

This e-mail is not and cannot, by its nature, be confidential. En route from me to you, it will pass across the public Internet, easily readable by any number of system administrators along the way.
    Nigel Johnson <nw.johnson at ieee.org>

     
Please consider the environment when deciding if you really need to print this message





More information about the cctalk mailing list