I create a labview code that get bin file, prepare it and then transfer packets of data to a device. Device received packet and answer to PC with specific command (19 bytes) with information, that device received transferred packet. Operation repeats until all packets a transferred. Channel works with USB to RS-485 converters (FTDI) on 9600baud, VISA timeout 350ms, with one device it works well, it need about a 6-7min to transfer all data. Problem began when I try to do transfer with 2 or more devices of the same type in parallel (connected to different USB-RS485 converters). VISA begin to slow down and i see that devices loose packets. How can I do data transfer in parallel?
