Reading data from serial ports

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2 total messages Started by Paul S. Sears Wed, 06 Jan 1993 16:39

#4729

Author: Paul S. Sears
Date: Wed, 06 Jan 1993 16:39

18 lines
1246 bytes

Is there a way to read data in from the serial ports?  We have tried  
something to the effect of

cat /dev/ttya | od -c

but we are not getting any results.  We need to grab all data comming in  
via either serial port and the data is 8-bit (binary, thus the need to  
pipe to od).  Can anyone tell me what we are doing wrong? Which of the  
ttys would be best to use (ttya, ttyda, ttydfa, ttydfa)?

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Re: Reading data from serial ports

#4926

Author: andrew
Date: Sun, 10 Jan 1993 21:46

27 lines
1502 bytes

In article <1if20rINNfjn@menudo.uh.edu> sears@uh.edu writes:
>
>Is there a way to read data in from the serial ports?  We have tried  
>something to the effect of
>
>cat /dev/ttya | od -c
>
>but we are not getting any results.  We need to grab all data comming in  
>via either serial port and the data is 8-bit (binary, thus the need to  
>pipe to od).  Can anyone tell me what we are doing wrong? Which of the  
>ttys would be best to use (ttya, ttyda, ttydfa, ttydfa)?

The best way would probably be to get one of the serial port objects.
To read the data from the port you basically send a readData: message
to the object and pass it a buffer...

BenaTong has an object called SerialSolutions.  I think it's $50, and
it looks easy to use (I have only seen the API - I have not used it).
It's probably worth checking it out.

andrew
-- 
andrew@cubetech.com      | "We cannot dwell in the time that is to come,
Andrew Loewenstern       |  lest we lose our now for a phantom of our
Cube Technologies, Inc.  |  own design." - Erendis
0000000701B61D1ADF0DFC9C16185CEA055200000007EB4A9FEB1922065D471A89E905B5

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