🚀 go-pugleaf

I am working with a SUN SPARC-2 system and I am having a 
difficult time setting up port ttya to talk to a RS-232 "non-terminal" 
device.  The link must be full duplex.  I am able to establish the 
link with the device, but when the device sends return data to the 
SUN, the SUN asks for login information.  I assume that is because I 
am setting the SUN port for terminal IO rather than raw IO.  I do not 
know how to fix this problem!
     This is how I am setting up the port:

     First, with super user privlidges, I edit the /etc/ttytab file 
and change the ttya initilization as follows:
>>>>>>>>>> ttya  "/usr/etc/getty vba.4800"  unknown  on local secure

     Second, I edit the /etc/gettytab file and include a definition 
for vba.4800 as follows:
>>>>>>>>>> vba.4800|4800-baud:\
>>>>>>>>>>     :p8:ec:sp#4800:
I also disabled the echo but I do not remember 2 digit cmd.  (ec?)

     Lastly, I reinitialize the system by typing:
>>>>>>>>>> # kill -1 1

     At this point the port is set up.  The only problem, I believe, 
is the getty command sets up the SUN for terminal IO rather than raw 
IO.  I can send data from the SUN to the RS-232 device all day with no 
problem.  However, as soon as the device sends data back to the SUN, 
the SUN spews out terminal IO such as "login:" and "password:".
     I hooked up a HP protocol analyzer to the SUN.  I orientated the 
SUN as the DCE and the protocol analyzer as the DTE.  I set the 
analyzer on auto configure, to verify the SUN's ttya port protocol, 
and then sent a few packets from the SUN to the analyzer.  The 
analyzer confirmed to the data as being the correct protocol.  At 
least I know this is OK.  Again, as soon as I had the analyzer send 
data back to the SUN, the SUN started spewing terminal IO.
     In the /etc/ttytab file I tried opening up ttya as,
>>>>>>>>>> ttya  none  unknown  on local secure <<<<<<<<<<
in an attempt to get away from the getty command.  Then I tried to use 
the stty command as follows to open up and configure the port:
>>>>>>>>>> stty 4800 c8 -parenb raw > /dev/ttya <<<<<<<<<<
This did not work either.  The SUN defaults to the generic term IO 
protocol of 9600, C7, and odd even parity.
     If you have and solutions I would be greatly appreciative.  I 
know I am missing something really simple.  Thank you very much for 
reading this mail.

Chuck_Fleener-MTI@echo.chinalake.navy.mil