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 to485 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 call open (...) solves this problem.
Does anybody have such trouble?
hardware: JUKI-511P-300, chipset GEODE C55530A OS: Linux, kernel 2.4.20 Best, reagards!
Thanks, Arkadi K.