uart stops to receive data

Hi, All!

I have a problem with UART on industrial computer JUKI-511.
I use UART to communicate with different 485 devices - simple program
in cycle asks these devices.
Then I enter distortions on 485 bus by (for example) closining
data- and data+ wires or by connecting independent transmitter to
485 bus, sometimes, after such experiments UART stops (forever) to
receive data from the
devices, but transmitting from UART works well and devices responds to
requests.
Reinitializing UART from the programm by system calls close (...),
open (...) solves
this problem.

I tested other industrial motherboards and this problem with
UART never occured.

Does anybody have such trouble?

hardware: motherboard - JUKI-511P-300, chipset - GEODE CS55530A
OS: Linux, kernel 2.4.20
Best, reagards!

Thanks,
Arkadi K.

.

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