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TMS320F28027F: 上位机同时读、写轮询4台机同时 会丢数据包?请问程序要怎么处理?

Part Number: TMS320F28027F


用modbus通讯协议,用485四台机并联通讯,程序中用SCI接收中断,发送在主环中,上位机通过485不停读写,轮询这4台机,可是会有丢数据包;但如果单台通讯是没有问题,或只读,轮询这4台机也没问题;为什么4台同时读、写出丢数据包呢?请问程序要怎么处理?