[TAG] doubt in accessing serial port

[vasavi s]

Hello,
             I have a problem in accessing the serial port .I am trying to
send data to another system using null modem.When we are using the program
in loopback method it's working fine like we are able to transmit data and
receive the data on a pc.But when trying to communicate between two systems
based on linux (using c code) we are not getting the output.When writing to
the port it is showing that it has written the data to the port.But on other
side (i.e.,  on another system) we couldn't read the data which we have sent
from first system.What to do ? Tried h/w flow control & sftware flowcontrol
but no use.Till now it was showing error like " error no.11,Could not read
, the resourcet is temporarily unavailable. Now It's saying like reading the
port successfully.But the number of bytes it 's showing is zero.We could nt
understand if the data we are  writing in first system is reaching the
second system with null modem and the other system is having a problem in
reading the data  or what ? Kindly suggest where the problem could be ?

Thanks & Regards,
vasavi
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