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checking for serial devices.

checking for serial devices.

Post by C. Doel » Wed, 05 May 1993 07:56:01



Hello Kerry!

Thursday April 29 1993 17:24, Kerry Alt wrote to (crosspost 1) All:

 KA> Is there a way to directly poll a port (say /dev/ttya) to see if a
 KA> device is connected and alive? We have an HP plotter that we need to
 KA> check if it is alive before we start a digitizing session.

 KA> Thanks in advance,

If you get an answer to this, could you forward it to me at the address in my
tagline? (Just in case I miss it.)  Thanks

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C.


 
 
 
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checking for serial devices.

Post by George Patap » Sat, 08 May 1993 14:38:14



Quote:>Hello Kerry!

>Thursday April 29 1993 17:24, Kerry Alt wrote to (crosspost 1) All:

> KA> Is there a way to directly poll a port (say /dev/ttya) to see if a
> KA> device is connected and alive? We have an HP plotter that we need to
> KA> check if it is alive before we start a digitizing session.

> KA> Thanks in advance,

>If you get an answer to this, could you forward it to me at the address in my
>tagline? (Just in case I miss it.)  Thanks

How about posting any answers to the group.  I have been having
the same problem for  while.  I was considering somehow accessing
the carrier detect signal. BTW if anyone can recommend a good and
easy book on Unix serial comunications it would be most welcome.

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1. checking for serial devices.

Is there a way to directly poll a port (say /dev/ttya) to see if a
device is connected and alive? We have an HP plotter that we need to
check if it is alive before we start a digitizing session.

Thanks in advance,

Kerry ---

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